/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=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=0.4 --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 23:54:16,682 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 23:54:16,685 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 23:54:16,731 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 23:54:16,732 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 23:54:16,744 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 23:54:16,746 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 23:54:16,749 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 23:54:16,751 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 23:54:16,752 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 23:54:16,753 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 23:54:16,754 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 23:54:16,754 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 23:54:16,755 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 23:54:16,756 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 23:54:16,757 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 23:54:16,758 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 23:54:16,759 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 23:54:16,760 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 23:54:16,762 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 23:54:16,764 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 23:54:16,765 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 23:54:16,766 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 23:54:16,767 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 23:54:16,769 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 23:54:16,769 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 23:54:16,769 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 23:54:16,770 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 23:54:16,771 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 23:54:16,772 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-21 23:54:16,772 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-21 23:54:16,773 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-21 23:54:16,773 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-21 23:54:16,774 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-21 23:54:16,775 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-21 23:54:16,775 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-21 23:54:16,776 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-21 23:54:16,776 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-21 23:54:16,776 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 23:54:16,777 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 23:54:16,778 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 23:54:16,779 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 23:54:16,801 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 23:54:16,801 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 23:54:16,802 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 23:54:16,802 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 23:54:16,803 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 23:54:16,803 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 23:54:16,803 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 23:54:16,803 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 23:54:16,804 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 23:54:16,804 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 23:54:16,804 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 23:54:16,804 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 23:54:16,804 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 23:54:16,804 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 23:54:16,805 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 23:54:16,805 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 23:54:16,805 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 23:54:16,805 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 23:54:16,806 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 23:54:16,806 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 23:54:16,806 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 23:54:16,806 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 23:54:16,806 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 23:54:16,807 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 23:54:16,807 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 23:54:16,807 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 23:54:16,807 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 23:54:16,807 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 23:54:16,807 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 23:54:16,808 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=WIDESTAMONGSMALL;tolerance=0.4;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.4;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.4;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.4;log-additional-information=true; [2020-08-21 23:54:17,097 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 23:54:17,109 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 23:54:17,113 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 23:54:17,115 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 23:54:17,116 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 23:54:17,117 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-08-21 23:54:17,191 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/264d636ef/a721bddb0c9049c0a1fba0826c3c067f/FLAGf21ea4af5 [2020-08-21 23:54:17,665 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 23:54:17,666 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-08-21 23:54:17,673 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/264d636ef/a721bddb0c9049c0a1fba0826c3c067f/FLAGf21ea4af5 [2020-08-21 23:54:18,081 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/264d636ef/a721bddb0c9049c0a1fba0826c3c067f [2020-08-21 23:54:18,090 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 23:54:18,092 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 23:54:18,093 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 23:54:18,093 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 23:54:18,097 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 23:54:18,098 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 11:54:18" (1/1) ... [2020-08-21 23:54:18,101 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@23b1b478 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:54:18, skipping insertion in model container [2020-08-21 23:54:18,102 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 11:54:18" (1/1) ... [2020-08-21 23:54:18,110 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 23:54:18,127 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 23:54:18,314 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 23:54:18,322 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 23:54:18,339 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 23:54:18,354 INFO L208 MainTranslator]: Completed translation [2020-08-21 23:54:18,354 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:54:18 WrapperNode [2020-08-21 23:54:18,354 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 23:54:18,355 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 23:54:18,355 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 23:54:18,356 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 23:54:18,449 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:54:18" (1/1) ... [2020-08-21 23:54:18,450 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:54:18" (1/1) ... [2020-08-21 23:54:18,463 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:54:18" (1/1) ... [2020-08-21 23:54:18,464 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:54:18" (1/1) ... [2020-08-21 23:54:18,473 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:54:18" (1/1) ... [2020-08-21 23:54:18,479 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:54:18" (1/1) ... [2020-08-21 23:54:18,480 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:54:18" (1/1) ... [2020-08-21 23:54:18,483 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 23:54:18,483 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 23:54:18,483 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 23:54:18,484 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 23:54:18,484 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:54:18" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 23:54:18,552 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 23:54:18,552 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 23:54:18,552 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 23:54:18,553 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-08-21 23:54:18,553 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 23:54:18,553 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 23:54:18,553 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 23:54:18,553 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-21 23:54:18,553 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_pointer [2020-08-21 23:54:18,554 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-21 23:54:18,554 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-21 23:54:18,554 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-21 23:54:18,554 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 23:54:18,555 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 23:54:18,555 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-21 23:54:18,555 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 23:54:18,555 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 23:54:18,555 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 23:54:18,834 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 23:54:18,834 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-21 23:54:18,840 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 11:54:18 BoogieIcfgContainer [2020-08-21 23:54:18,840 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 23:54:18,842 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 23:54:18,842 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 23:54:18,846 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 23:54:18,846 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 11:54:18" (1/3) ... [2020-08-21 23:54:18,847 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5ecce0d8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 11:54:18, skipping insertion in model container [2020-08-21 23:54:18,847 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:54:18" (2/3) ... [2020-08-21 23:54:18,848 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5ecce0d8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 11:54:18, skipping insertion in model container [2020-08-21 23:54:18,848 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 11:54:18" (3/3) ... [2020-08-21 23:54:18,850 INFO L109 eAbstractionObserver]: Analyzing ICFG flag_loopdep.i [2020-08-21 23:54:18,864 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 23:54:18,873 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 23:54:18,893 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 23:54:18,923 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 23:54:18,923 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 23:54:18,923 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 23:54:18,924 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 23:54:18,924 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 23:54:18,924 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 23:54:18,924 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 23:54:18,925 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 23:54:18,946 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-08-21 23:54:18,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 23:54:18,954 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:18,955 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:18,956 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:18,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:18,966 INFO L82 PathProgramCache]: Analyzing trace with hash 1059974619, now seen corresponding path program 1 times [2020-08-21 23:54:18,978 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:18,978 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [61403778] [2020-08-21 23:54:18,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:19,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:19,185 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:54:19,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:19,212 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:54:19,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:19,225 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:54:19,227 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [61403778] [2020-08-21 23:54:19,229 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 23:54:19,229 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 23:54:19,231 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [769824711] [2020-08-21 23:54:19,236 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 23:54:19,237 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:54:19,251 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 23:54:19,252 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 23:54:19,254 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 4 states. [2020-08-21 23:54:19,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:54:19,422 INFO L93 Difference]: Finished difference Result 59 states and 76 transitions. [2020-08-21 23:54:19,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 23:54:19,425 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-21 23:54:19,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:54:19,437 INFO L225 Difference]: With dead ends: 59 [2020-08-21 23:54:19,438 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 23:54:19,442 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 23:54:19,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 23:54:19,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-21 23:54:19,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-21 23:54:19,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-08-21 23:54:19,509 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 20 [2020-08-21 23:54:19,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:54:19,510 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-08-21 23:54:19,510 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 23:54:19,510 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-08-21 23:54:19,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 23:54:19,512 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:19,512 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:19,512 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 23:54:19,513 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:19,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:19,514 INFO L82 PathProgramCache]: Analyzing trace with hash -931069882, now seen corresponding path program 1 times [2020-08-21 23:54:19,514 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:19,515 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [228214873] [2020-08-21 23:54:19,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:19,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:19,586 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:54:19,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:19,607 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:54:19,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:19,688 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:54:19,689 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [228214873] [2020-08-21 23:54:19,689 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 23:54:19,690 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-21 23:54:19,690 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [363970679] [2020-08-21 23:54:19,692 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 23:54:19,692 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:54:19,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 23:54:19,693 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-21 23:54:19,693 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2020-08-21 23:54:19,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:54:19,915 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-08-21 23:54:19,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 23:54:19,916 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-08-21 23:54:19,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:54:19,917 INFO L225 Difference]: With dead ends: 48 [2020-08-21 23:54:19,917 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 23:54:19,919 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2020-08-21 23:54:19,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 23:54:19,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-21 23:54:19,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 23:54:19,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-08-21 23:54:19,928 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-08-21 23:54:19,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:54:19,929 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-08-21 23:54:19,929 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 23:54:19,929 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-08-21 23:54:19,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 23:54:19,930 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:19,930 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:19,931 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 23:54:19,931 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:19,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:19,932 INFO L82 PathProgramCache]: Analyzing trace with hash 1782065480, now seen corresponding path program 1 times [2020-08-21 23:54:19,932 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:19,932 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2014432206] [2020-08-21 23:54:19,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:19,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:19,990 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:54:19,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:20,023 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:54:20,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:20,125 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:54:20,126 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2014432206] [2020-08-21 23:54:20,126 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:54:20,126 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 23:54:20,127 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1824958952] [2020-08-21 23:54:20,127 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 23:54:20,128 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:54:20,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 23:54:20,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-21 23:54:20,128 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 7 states. [2020-08-21 23:54:20,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:54:20,306 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-08-21 23:54:20,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 23:54:20,307 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2020-08-21 23:54:20,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:54:20,308 INFO L225 Difference]: With dead ends: 50 [2020-08-21 23:54:20,308 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 23:54:20,309 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-08-21 23:54:20,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 23:54:20,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-21 23:54:20,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 23:54:20,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-08-21 23:54:20,317 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 22 [2020-08-21 23:54:20,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:54:20,318 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-08-21 23:54:20,318 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 23:54:20,318 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-08-21 23:54:20,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 23:54:20,319 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:20,319 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:20,319 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 23:54:20,320 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:20,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:20,320 INFO L82 PathProgramCache]: Analyzing trace with hash 2059999690, now seen corresponding path program 2 times [2020-08-21 23:54:20,321 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:20,321 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1904424254] [2020-08-21 23:54:20,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:20,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:20,382 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:54:20,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:20,405 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:54:20,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:20,579 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:54:20,580 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1904424254] [2020-08-21 23:54:20,580 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:54:20,580 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 23:54:20,581 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1880721006] [2020-08-21 23:54:20,582 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 23:54:20,582 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:54:20,582 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 23:54:20,583 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-08-21 23:54:20,584 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2020-08-21 23:54:20,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:54:20,766 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-08-21 23:54:20,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 23:54:20,767 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-08-21 23:54:20,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:54:20,768 INFO L225 Difference]: With dead ends: 52 [2020-08-21 23:54:20,768 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 23:54:20,769 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-21 23:54:20,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 23:54:20,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-21 23:54:20,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 23:54:20,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-08-21 23:54:20,776 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 24 [2020-08-21 23:54:20,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:54:20,776 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-08-21 23:54:20,777 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 23:54:20,777 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-08-21 23:54:20,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 23:54:20,778 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:20,778 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:20,779 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 23:54:20,779 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:20,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:20,779 INFO L82 PathProgramCache]: Analyzing trace with hash -1428164148, now seen corresponding path program 3 times [2020-08-21 23:54:20,780 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:20,780 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [268586830] [2020-08-21 23:54:20,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:20,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:20,819 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:54:20,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:20,833 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:54:20,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:21,003 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:54:21,004 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [268586830] [2020-08-21 23:54:21,004 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:54:21,004 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 23:54:21,005 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1244767530] [2020-08-21 23:54:21,005 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 23:54:21,006 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:54:21,006 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 23:54:21,006 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-21 23:54:21,007 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 9 states. [2020-08-21 23:54:21,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:54:21,195 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-08-21 23:54:21,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 23:54:21,196 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-08-21 23:54:21,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:54:21,197 INFO L225 Difference]: With dead ends: 54 [2020-08-21 23:54:21,197 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 23:54:21,198 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-08-21 23:54:21,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 23:54:21,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-21 23:54:21,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 23:54:21,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-08-21 23:54:21,204 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 26 [2020-08-21 23:54:21,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:54:21,205 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-08-21 23:54:21,205 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 23:54:21,205 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-08-21 23:54:21,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 23:54:21,206 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:21,206 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:21,207 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 23:54:21,207 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:21,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:21,207 INFO L82 PathProgramCache]: Analyzing trace with hash 815845710, now seen corresponding path program 4 times [2020-08-21 23:54:21,208 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:21,208 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1557649197] [2020-08-21 23:54:21,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:21,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:21,248 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:54:21,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:21,267 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:54:21,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:21,463 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:54:21,463 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1557649197] [2020-08-21 23:54:21,463 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:54:21,464 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 23:54:21,464 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [475709830] [2020-08-21 23:54:21,465 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 23:54:21,465 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:54:21,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 23:54:21,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-08-21 23:54:21,466 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 10 states. [2020-08-21 23:54:21,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:54:21,672 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2020-08-21 23:54:21,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 23:54:21,673 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-08-21 23:54:21,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:54:21,674 INFO L225 Difference]: With dead ends: 56 [2020-08-21 23:54:21,674 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 23:54:21,675 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2020-08-21 23:54:21,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 23:54:21,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-21 23:54:21,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 23:54:21,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-08-21 23:54:21,681 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 28 [2020-08-21 23:54:21,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:54:21,681 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-08-21 23:54:21,681 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 23:54:21,681 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-08-21 23:54:21,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 23:54:21,682 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:21,683 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:21,683 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 23:54:21,683 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:21,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:21,684 INFO L82 PathProgramCache]: Analyzing trace with hash 1235736656, now seen corresponding path program 5 times [2020-08-21 23:54:21,684 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:21,684 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [160956896] [2020-08-21 23:54:21,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:21,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:21,719 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:54:21,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:21,734 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:54:21,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:21,984 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:54:21,985 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [160956896] [2020-08-21 23:54:21,985 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:54:21,985 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 23:54:21,985 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [352330108] [2020-08-21 23:54:21,986 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 23:54:21,986 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:54:21,986 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 23:54:21,987 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-21 23:54:21,988 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 11 states. [2020-08-21 23:54:22,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:54:22,198 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2020-08-21 23:54:22,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 23:54:22,198 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-21 23:54:22,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:54:22,199 INFO L225 Difference]: With dead ends: 58 [2020-08-21 23:54:22,201 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 23:54:22,202 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2020-08-21 23:54:22,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 23:54:22,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-21 23:54:22,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 23:54:22,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-21 23:54:22,210 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 30 [2020-08-21 23:54:22,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:54:22,212 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-21 23:54:22,212 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 23:54:22,212 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-21 23:54:22,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 23:54:22,213 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:22,213 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:22,213 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 23:54:22,214 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:22,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:22,214 INFO L82 PathProgramCache]: Analyzing trace with hash 1024009938, now seen corresponding path program 6 times [2020-08-21 23:54:22,214 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:22,214 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1276724414] [2020-08-21 23:54:22,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:22,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:22,256 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:54:22,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:22,275 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:54:22,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:22,544 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:54:22,545 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1276724414] [2020-08-21 23:54:22,545 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:54:22,545 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 23:54:22,545 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2015057019] [2020-08-21 23:54:22,546 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 23:54:22,546 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:54:22,546 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 23:54:22,547 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-08-21 23:54:22,547 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 12 states. [2020-08-21 23:54:22,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:54:22,756 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2020-08-21 23:54:22,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 23:54:22,757 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-08-21 23:54:22,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:54:22,758 INFO L225 Difference]: With dead ends: 60 [2020-08-21 23:54:22,758 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 23:54:22,761 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=68, Invalid=142, Unknown=0, NotChecked=0, Total=210 [2020-08-21 23:54:22,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 23:54:22,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-21 23:54:22,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 23:54:22,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-21 23:54:22,773 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 32 [2020-08-21 23:54:22,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:54:22,777 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-21 23:54:22,777 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 23:54:22,777 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-21 23:54:22,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 23:54:22,778 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:22,779 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:22,782 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 23:54:22,782 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:22,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:22,783 INFO L82 PathProgramCache]: Analyzing trace with hash -581903148, now seen corresponding path program 7 times [2020-08-21 23:54:22,783 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:22,783 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [409667089] [2020-08-21 23:54:22,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:22,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:22,839 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:54:22,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:22,855 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:54:22,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:23,187 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:54:23,188 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [409667089] [2020-08-21 23:54:23,188 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:54:23,188 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 23:54:23,188 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [381562378] [2020-08-21 23:54:23,189 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 23:54:23,189 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:54:23,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 23:54:23,190 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2020-08-21 23:54:23,190 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 13 states. [2020-08-21 23:54:23,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:54:23,379 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-08-21 23:54:23,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 23:54:23,379 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-08-21 23:54:23,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:54:23,380 INFO L225 Difference]: With dead ends: 62 [2020-08-21 23:54:23,381 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 23:54:23,381 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=79, Invalid=161, Unknown=0, NotChecked=0, Total=240 [2020-08-21 23:54:23,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 23:54:23,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-21 23:54:23,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 23:54:23,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2020-08-21 23:54:23,387 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 34 [2020-08-21 23:54:23,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:54:23,388 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2020-08-21 23:54:23,388 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 23:54:23,388 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2020-08-21 23:54:23,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 23:54:23,389 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:23,389 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:23,389 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 23:54:23,389 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:23,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:23,390 INFO L82 PathProgramCache]: Analyzing trace with hash -1971119530, now seen corresponding path program 8 times [2020-08-21 23:54:23,390 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:23,390 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [296571588] [2020-08-21 23:54:23,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:23,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:23,422 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:54:23,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:23,433 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:54:23,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:23,793 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 23:54:23,794 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [296571588] [2020-08-21 23:54:23,794 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:54:23,794 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 23:54:23,795 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [792939103] [2020-08-21 23:54:23,795 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 23:54:23,795 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:54:23,796 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 23:54:23,796 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-08-21 23:54:23,796 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand 14 states. [2020-08-21 23:54:23,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:54:23,990 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2020-08-21 23:54:23,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 23:54:23,990 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-21 23:54:23,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:54:23,991 INFO L225 Difference]: With dead ends: 64 [2020-08-21 23:54:23,991 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 23:54:23,992 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=91, Invalid=181, Unknown=0, NotChecked=0, Total=272 [2020-08-21 23:54:23,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 23:54:23,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-21 23:54:23,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 23:54:23,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2020-08-21 23:54:23,999 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 36 [2020-08-21 23:54:23,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:54:23,999 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2020-08-21 23:54:23,999 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 23:54:23,999 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2020-08-21 23:54:24,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 23:54:24,000 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:24,001 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:24,001 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 23:54:24,001 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:24,001 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:24,002 INFO L82 PathProgramCache]: Analyzing trace with hash -1273233576, now seen corresponding path program 9 times [2020-08-21 23:54:24,002 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:24,002 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1940879024] [2020-08-21 23:54:24,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:24,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:24,049 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:54:24,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:24,061 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:54:24,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:24,078 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-21 23:54:24,078 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1940879024] [2020-08-21 23:54:24,079 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 23:54:24,079 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 23:54:24,079 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [136072183] [2020-08-21 23:54:24,080 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 23:54:24,080 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:54:24,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 23:54:24,081 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 23:54:24,081 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 5 states. [2020-08-21 23:54:24,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:54:24,173 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2020-08-21 23:54:24,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 23:54:24,173 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2020-08-21 23:54:24,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:54:24,176 INFO L225 Difference]: With dead ends: 65 [2020-08-21 23:54:24,177 INFO L226 Difference]: Without dead ends: 53 [2020-08-21 23:54:24,178 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 23:54:24,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-21 23:54:24,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 46. [2020-08-21 23:54:24,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 23:54:24,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-08-21 23:54:24,190 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 38 [2020-08-21 23:54:24,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:54:24,190 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-08-21 23:54:24,190 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 23:54:24,190 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-08-21 23:54:24,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-21 23:54:24,191 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:24,191 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:24,192 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 23:54:24,192 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:24,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:24,192 INFO L82 PathProgramCache]: Analyzing trace with hash -1053921041, now seen corresponding path program 1 times [2020-08-21 23:54:24,193 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:24,193 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1008296270] [2020-08-21 23:54:24,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:24,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:24,250 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:54:24,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:24,278 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:54:24,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:24,290 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-21 23:54:24,290 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1008296270] [2020-08-21 23:54:24,291 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:54:24,291 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 23:54:24,291 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1968894950] [2020-08-21 23:54:24,292 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 23:54:24,292 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:54:24,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 23:54:24,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-21 23:54:24,292 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 6 states. [2020-08-21 23:54:24,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:54:24,401 INFO L93 Difference]: Finished difference Result 73 states and 85 transitions. [2020-08-21 23:54:24,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 23:54:24,402 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 41 [2020-08-21 23:54:24,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:54:24,403 INFO L225 Difference]: With dead ends: 73 [2020-08-21 23:54:24,403 INFO L226 Difference]: Without dead ends: 61 [2020-08-21 23:54:24,404 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-21 23:54:24,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-21 23:54:24,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 49. [2020-08-21 23:54:24,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 23:54:24,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2020-08-21 23:54:24,411 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 41 [2020-08-21 23:54:24,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:54:24,411 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2020-08-21 23:54:24,412 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 23:54:24,412 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2020-08-21 23:54:24,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 23:54:24,412 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:24,413 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:24,413 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 23:54:24,413 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:24,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:24,413 INFO L82 PathProgramCache]: Analyzing trace with hash -159448072, now seen corresponding path program 2 times [2020-08-21 23:54:24,414 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:24,414 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2089765936] [2020-08-21 23:54:24,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:24,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:24,455 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:54:24,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:24,469 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:54:24,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:24,484 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2020-08-21 23:54:24,484 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2089765936] [2020-08-21 23:54:24,484 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 23:54:24,485 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 23:54:24,485 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [668422217] [2020-08-21 23:54:24,485 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 23:54:24,486 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:54:24,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 23:54:24,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 23:54:24,486 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 5 states. [2020-08-21 23:54:24,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:54:24,561 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2020-08-21 23:54:24,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 23:54:24,562 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 44 [2020-08-21 23:54:24,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:54:24,563 INFO L225 Difference]: With dead ends: 69 [2020-08-21 23:54:24,563 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 23:54:24,564 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 23:54:24,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 23:54:24,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-21 23:54:24,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 23:54:24,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2020-08-21 23:54:24,569 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 44 [2020-08-21 23:54:24,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:54:24,569 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2020-08-21 23:54:24,570 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 23:54:24,570 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2020-08-21 23:54:24,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 23:54:24,570 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:24,571 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:24,571 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 23:54:24,571 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:24,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:24,571 INFO L82 PathProgramCache]: Analyzing trace with hash -1139281096, now seen corresponding path program 1 times [2020-08-21 23:54:24,572 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:24,572 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1544190274] [2020-08-21 23:54:24,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:24,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:24,606 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:54:24,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:24,617 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:54:24,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:24,962 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 23:54:24,962 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1544190274] [2020-08-21 23:54:24,962 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:54:24,963 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 23:54:24,963 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [833063308] [2020-08-21 23:54:24,963 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 23:54:24,963 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:54:24,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 23:54:24,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2020-08-21 23:54:24,964 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand 15 states. [2020-08-21 23:54:25,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:54:25,223 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2020-08-21 23:54:25,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 23:54:25,223 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2020-08-21 23:54:25,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:54:25,224 INFO L225 Difference]: With dead ends: 74 [2020-08-21 23:54:25,225 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 23:54:25,225 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=104, Invalid=202, Unknown=0, NotChecked=0, Total=306 [2020-08-21 23:54:25,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 23:54:25,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-21 23:54:25,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 23:54:25,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2020-08-21 23:54:25,232 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 44 [2020-08-21 23:54:25,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:54:25,232 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2020-08-21 23:54:25,232 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 23:54:25,232 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2020-08-21 23:54:25,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 23:54:25,233 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:25,233 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:25,233 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 23:54:25,233 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:25,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:25,234 INFO L82 PathProgramCache]: Analyzing trace with hash 763672122, now seen corresponding path program 2 times [2020-08-21 23:54:25,234 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:25,234 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1015447100] [2020-08-21 23:54:25,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:25,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:25,307 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:54:25,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:25,317 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:54:25,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:25,724 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 23:54:25,725 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1015447100] [2020-08-21 23:54:25,725 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:54:25,725 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 23:54:25,725 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [681126044] [2020-08-21 23:54:25,726 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 23:54:25,726 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:54:25,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 23:54:25,726 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2020-08-21 23:54:25,726 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand 16 states. [2020-08-21 23:54:25,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:54:25,955 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2020-08-21 23:54:25,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 23:54:25,955 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 46 [2020-08-21 23:54:25,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:54:25,956 INFO L225 Difference]: With dead ends: 76 [2020-08-21 23:54:25,956 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 23:54:25,958 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=118, Invalid=224, Unknown=0, NotChecked=0, Total=342 [2020-08-21 23:54:25,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 23:54:25,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-21 23:54:25,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-21 23:54:25,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2020-08-21 23:54:25,971 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 46 [2020-08-21 23:54:25,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:54:25,971 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2020-08-21 23:54:25,971 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 23:54:25,971 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2020-08-21 23:54:25,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 23:54:25,972 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:25,972 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:25,972 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 23:54:25,972 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:25,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:25,973 INFO L82 PathProgramCache]: Analyzing trace with hash -154353476, now seen corresponding path program 3 times [2020-08-21 23:54:25,973 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:25,973 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [556014156] [2020-08-21 23:54:25,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:25,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:26,040 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:54:26,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:26,052 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:54:26,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:26,535 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 23:54:26,535 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [556014156] [2020-08-21 23:54:26,537 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:54:26,537 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 23:54:26,537 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [68717236] [2020-08-21 23:54:26,538 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 23:54:26,538 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:54:26,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 23:54:26,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=175, Unknown=0, NotChecked=0, Total=272 [2020-08-21 23:54:26,539 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 17 states. [2020-08-21 23:54:26,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:54:26,788 INFO L93 Difference]: Finished difference Result 78 states and 84 transitions. [2020-08-21 23:54:26,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 23:54:26,789 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-21 23:54:26,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:54:26,790 INFO L225 Difference]: With dead ends: 78 [2020-08-21 23:54:26,790 INFO L226 Difference]: Without dead ends: 56 [2020-08-21 23:54:26,791 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=133, Invalid=247, Unknown=0, NotChecked=0, Total=380 [2020-08-21 23:54:26,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-21 23:54:26,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-21 23:54:26,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 23:54:26,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2020-08-21 23:54:26,796 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 48 [2020-08-21 23:54:26,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:54:26,796 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2020-08-21 23:54:26,796 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 23:54:26,796 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2020-08-21 23:54:26,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-21 23:54:26,797 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:26,797 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:26,797 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 23:54:26,797 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:26,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:26,798 INFO L82 PathProgramCache]: Analyzing trace with hash -1908657474, now seen corresponding path program 4 times [2020-08-21 23:54:26,798 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:26,798 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1847828550] [2020-08-21 23:54:26,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:26,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:26,840 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:54:26,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:26,849 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:54:26,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:27,433 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 23:54:27,434 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1847828550] [2020-08-21 23:54:27,435 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:54:27,435 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 23:54:27,435 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1832846067] [2020-08-21 23:54:27,436 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 23:54:27,436 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:54:27,437 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 23:54:27,437 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=195, Unknown=0, NotChecked=0, Total=306 [2020-08-21 23:54:27,437 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand 18 states. [2020-08-21 23:54:27,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:54:27,682 INFO L93 Difference]: Finished difference Result 80 states and 86 transitions. [2020-08-21 23:54:27,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 23:54:27,683 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2020-08-21 23:54:27,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:54:27,684 INFO L225 Difference]: With dead ends: 80 [2020-08-21 23:54:27,684 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 23:54:27,685 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=149, Invalid=271, Unknown=0, NotChecked=0, Total=420 [2020-08-21 23:54:27,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 23:54:27,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-21 23:54:27,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 23:54:27,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2020-08-21 23:54:27,695 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 50 [2020-08-21 23:54:27,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:54:27,695 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2020-08-21 23:54:27,695 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 23:54:27,696 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2020-08-21 23:54:27,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-21 23:54:27,697 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:27,697 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:27,697 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 23:54:27,698 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:27,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:27,698 INFO L82 PathProgramCache]: Analyzing trace with hash 127347776, now seen corresponding path program 5 times [2020-08-21 23:54:27,698 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:27,698 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [171610976] [2020-08-21 23:54:27,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:27,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:27,755 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:54:27,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:27,765 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:54:27,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:28,360 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 23:54:28,361 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [171610976] [2020-08-21 23:54:28,361 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:54:28,361 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 23:54:28,361 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [23974151] [2020-08-21 23:54:28,362 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 23:54:28,362 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:54:28,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 23:54:28,363 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=216, Unknown=0, NotChecked=0, Total=342 [2020-08-21 23:54:28,363 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand 19 states. [2020-08-21 23:54:28,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:54:28,612 INFO L93 Difference]: Finished difference Result 82 states and 88 transitions. [2020-08-21 23:54:28,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 23:54:28,612 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 52 [2020-08-21 23:54:28,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:54:28,613 INFO L225 Difference]: With dead ends: 82 [2020-08-21 23:54:28,613 INFO L226 Difference]: Without dead ends: 60 [2020-08-21 23:54:28,614 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=166, Invalid=296, Unknown=0, NotChecked=0, Total=462 [2020-08-21 23:54:28,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-21 23:54:28,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-21 23:54:28,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-21 23:54:28,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2020-08-21 23:54:28,618 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 52 [2020-08-21 23:54:28,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:54:28,619 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2020-08-21 23:54:28,619 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 23:54:28,619 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2020-08-21 23:54:28,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 23:54:28,620 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:28,620 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:28,620 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 23:54:28,620 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:28,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:28,621 INFO L82 PathProgramCache]: Analyzing trace with hash -1776693950, now seen corresponding path program 6 times [2020-08-21 23:54:28,621 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:28,621 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [93142156] [2020-08-21 23:54:28,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:28,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:28,657 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:54:28,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:28,668 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:54:28,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:29,247 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 23:54:29,248 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [93142156] [2020-08-21 23:54:29,248 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:54:29,248 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 23:54:29,248 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1327921596] [2020-08-21 23:54:29,249 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 23:54:29,249 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:54:29,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 23:54:29,250 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=238, Unknown=0, NotChecked=0, Total=380 [2020-08-21 23:54:29,250 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand 20 states. [2020-08-21 23:54:29,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:54:29,533 INFO L93 Difference]: Finished difference Result 84 states and 90 transitions. [2020-08-21 23:54:29,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 23:54:29,539 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 54 [2020-08-21 23:54:29,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:54:29,540 INFO L225 Difference]: With dead ends: 84 [2020-08-21 23:54:29,540 INFO L226 Difference]: Without dead ends: 62 [2020-08-21 23:54:29,541 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=184, Invalid=322, Unknown=0, NotChecked=0, Total=506 [2020-08-21 23:54:29,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-21 23:54:29,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-21 23:54:29,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-21 23:54:29,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2020-08-21 23:54:29,545 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 54 [2020-08-21 23:54:29,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:54:29,545 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2020-08-21 23:54:29,545 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 23:54:29,545 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2020-08-21 23:54:29,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 23:54:29,546 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:29,546 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:29,546 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 23:54:29,547 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:29,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:29,547 INFO L82 PathProgramCache]: Analyzing trace with hash -1904724540, now seen corresponding path program 7 times [2020-08-21 23:54:29,547 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:29,547 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [40308778] [2020-08-21 23:54:29,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:29,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:29,589 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:54:29,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:29,598 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:54:29,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:30,272 INFO L134 CoverageAnalysis]: Checked inductivity of 230 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 23:54:30,273 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [40308778] [2020-08-21 23:54:30,273 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:54:30,273 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 23:54:30,273 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2044417430] [2020-08-21 23:54:30,273 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 23:54:30,274 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:54:30,274 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 23:54:30,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=261, Unknown=0, NotChecked=0, Total=420 [2020-08-21 23:54:30,274 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand 21 states. [2020-08-21 23:54:30,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:54:30,494 INFO L93 Difference]: Finished difference Result 86 states and 92 transitions. [2020-08-21 23:54:30,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 23:54:30,495 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 56 [2020-08-21 23:54:30,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:54:30,495 INFO L225 Difference]: With dead ends: 86 [2020-08-21 23:54:30,496 INFO L226 Difference]: Without dead ends: 64 [2020-08-21 23:54:30,496 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=203, Invalid=349, Unknown=0, NotChecked=0, Total=552 [2020-08-21 23:54:30,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-21 23:54:30,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-21 23:54:30,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-21 23:54:30,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2020-08-21 23:54:30,507 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 56 [2020-08-21 23:54:30,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:54:30,508 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2020-08-21 23:54:30,508 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 23:54:30,508 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2020-08-21 23:54:30,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-21 23:54:30,512 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:30,512 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:30,513 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 23:54:30,513 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:30,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:30,514 INFO L82 PathProgramCache]: Analyzing trace with hash -388069946, now seen corresponding path program 8 times [2020-08-21 23:54:30,514 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:30,514 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [285391806] [2020-08-21 23:54:30,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:30,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:30,552 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:54:30,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:30,562 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:54:30,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:31,471 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 23:54:31,471 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [285391806] [2020-08-21 23:54:31,472 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:54:31,472 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 23:54:31,472 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1810667683] [2020-08-21 23:54:31,475 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 23:54:31,475 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:54:31,475 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 23:54:31,476 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=285, Unknown=0, NotChecked=0, Total=462 [2020-08-21 23:54:31,476 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand 22 states. [2020-08-21 23:54:31,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:54:31,751 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2020-08-21 23:54:31,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 23:54:31,753 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 58 [2020-08-21 23:54:31,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:54:31,753 INFO L225 Difference]: With dead ends: 88 [2020-08-21 23:54:31,754 INFO L226 Difference]: Without dead ends: 66 [2020-08-21 23:54:31,755 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=223, Invalid=377, Unknown=0, NotChecked=0, Total=600 [2020-08-21 23:54:31,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-21 23:54:31,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-21 23:54:31,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-21 23:54:31,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 68 transitions. [2020-08-21 23:54:31,759 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 68 transitions. Word has length 58 [2020-08-21 23:54:31,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:54:31,760 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 68 transitions. [2020-08-21 23:54:31,760 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 23:54:31,760 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 68 transitions. [2020-08-21 23:54:31,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-21 23:54:31,761 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:31,761 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:31,761 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 23:54:31,761 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:31,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:31,761 INFO L82 PathProgramCache]: Analyzing trace with hash 1123081544, now seen corresponding path program 9 times [2020-08-21 23:54:31,762 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:31,762 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1775674283] [2020-08-21 23:54:31,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:31,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:31,806 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:54:31,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:31,816 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:54:31,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:32,598 INFO L134 CoverageAnalysis]: Checked inductivity of 294 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 23:54:32,599 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1775674283] [2020-08-21 23:54:32,599 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:54:32,599 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 23:54:32,599 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2121378171] [2020-08-21 23:54:32,600 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 23:54:32,600 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:54:32,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 23:54:32,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=310, Unknown=0, NotChecked=0, Total=506 [2020-08-21 23:54:32,600 INFO L87 Difference]: Start difference. First operand 65 states and 68 transitions. Second operand 23 states. [2020-08-21 23:54:32,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:54:32,908 INFO L93 Difference]: Finished difference Result 90 states and 96 transitions. [2020-08-21 23:54:32,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 23:54:32,910 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 60 [2020-08-21 23:54:32,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:54:32,910 INFO L225 Difference]: With dead ends: 90 [2020-08-21 23:54:32,910 INFO L226 Difference]: Without dead ends: 68 [2020-08-21 23:54:32,911 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=244, Invalid=406, Unknown=0, NotChecked=0, Total=650 [2020-08-21 23:54:32,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-21 23:54:32,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-21 23:54:32,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-21 23:54:32,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2020-08-21 23:54:32,916 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 60 [2020-08-21 23:54:32,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:54:32,916 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2020-08-21 23:54:32,916 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 23:54:32,916 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2020-08-21 23:54:32,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-21 23:54:32,917 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:32,917 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:32,917 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 23:54:32,917 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:32,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:32,918 INFO L82 PathProgramCache]: Analyzing trace with hash 1640717386, now seen corresponding path program 10 times [2020-08-21 23:54:32,918 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:32,918 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1618138015] [2020-08-21 23:54:32,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:32,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:32,962 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:54:32,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:32,982 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:54:32,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:33,838 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 23:54:33,840 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1618138015] [2020-08-21 23:54:33,840 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:54:33,840 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 23:54:33,841 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [366726989] [2020-08-21 23:54:33,841 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 23:54:33,841 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:54:33,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 23:54:33,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=336, Unknown=0, NotChecked=0, Total=552 [2020-08-21 23:54:33,842 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 24 states. [2020-08-21 23:54:34,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:54:34,112 INFO L93 Difference]: Finished difference Result 92 states and 98 transitions. [2020-08-21 23:54:34,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 23:54:34,118 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 62 [2020-08-21 23:54:34,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:54:34,119 INFO L225 Difference]: With dead ends: 92 [2020-08-21 23:54:34,119 INFO L226 Difference]: Without dead ends: 70 [2020-08-21 23:54:34,120 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=266, Invalid=436, Unknown=0, NotChecked=0, Total=702 [2020-08-21 23:54:34,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-21 23:54:34,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-21 23:54:34,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-21 23:54:34,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2020-08-21 23:54:34,123 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 62 [2020-08-21 23:54:34,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:54:34,124 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2020-08-21 23:54:34,124 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 23:54:34,124 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2020-08-21 23:54:34,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-21 23:54:34,124 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:34,124 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:34,125 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 23:54:34,125 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:34,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:34,125 INFO L82 PathProgramCache]: Analyzing trace with hash 872555212, now seen corresponding path program 11 times [2020-08-21 23:54:34,125 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:34,125 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [970351073] [2020-08-21 23:54:34,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:34,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:34,179 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:54:34,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:34,187 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:54:34,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:35,039 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 23:54:35,039 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [970351073] [2020-08-21 23:54:35,039 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:54:35,039 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 23:54:35,040 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1198590428] [2020-08-21 23:54:35,040 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 23:54:35,040 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:54:35,040 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 23:54:35,040 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=363, Unknown=0, NotChecked=0, Total=600 [2020-08-21 23:54:35,041 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand 25 states. [2020-08-21 23:54:35,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:54:35,377 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2020-08-21 23:54:35,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 23:54:35,378 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 64 [2020-08-21 23:54:35,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:54:35,379 INFO L225 Difference]: With dead ends: 94 [2020-08-21 23:54:35,379 INFO L226 Difference]: Without dead ends: 72 [2020-08-21 23:54:35,380 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=289, Invalid=467, Unknown=0, NotChecked=0, Total=756 [2020-08-21 23:54:35,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-21 23:54:35,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-21 23:54:35,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-21 23:54:35,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 74 transitions. [2020-08-21 23:54:35,385 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 74 transitions. Word has length 64 [2020-08-21 23:54:35,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:54:35,386 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 74 transitions. [2020-08-21 23:54:35,386 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 23:54:35,386 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 74 transitions. [2020-08-21 23:54:35,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-21 23:54:35,387 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:35,387 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:35,387 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 23:54:35,387 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:35,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:35,387 INFO L82 PathProgramCache]: Analyzing trace with hash 1403080910, now seen corresponding path program 12 times [2020-08-21 23:54:35,388 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:35,388 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1807493402] [2020-08-21 23:54:35,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:35,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:35,431 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:54:35,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:35,447 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:54:35,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:36,410 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 23:54:36,411 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1807493402] [2020-08-21 23:54:36,411 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:54:36,411 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 23:54:36,411 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1054020701] [2020-08-21 23:54:36,411 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 23:54:36,412 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:54:36,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 23:54:36,412 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2020-08-21 23:54:36,412 INFO L87 Difference]: Start difference. First operand 71 states and 74 transitions. Second operand 26 states. [2020-08-21 23:54:36,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:54:36,740 INFO L93 Difference]: Finished difference Result 96 states and 102 transitions. [2020-08-21 23:54:36,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 23:54:36,740 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 66 [2020-08-21 23:54:36,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:54:36,741 INFO L225 Difference]: With dead ends: 96 [2020-08-21 23:54:36,741 INFO L226 Difference]: Without dead ends: 74 [2020-08-21 23:54:36,742 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=313, Invalid=499, Unknown=0, NotChecked=0, Total=812 [2020-08-21 23:54:36,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-21 23:54:36,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-21 23:54:36,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-21 23:54:36,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 76 transitions. [2020-08-21 23:54:36,746 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 76 transitions. Word has length 66 [2020-08-21 23:54:36,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:54:36,747 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 76 transitions. [2020-08-21 23:54:36,747 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 23:54:36,747 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 76 transitions. [2020-08-21 23:54:36,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-21 23:54:36,748 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:36,748 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:36,748 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 23:54:36,748 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:36,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:36,749 INFO L82 PathProgramCache]: Analyzing trace with hash 137168464, now seen corresponding path program 13 times [2020-08-21 23:54:36,749 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:36,749 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [812750040] [2020-08-21 23:54:36,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:36,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:36,822 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:54:36,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:36,832 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:54:36,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:37,881 INFO L134 CoverageAnalysis]: Checked inductivity of 446 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 23:54:37,881 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [812750040] [2020-08-21 23:54:37,881 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:54:37,881 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 23:54:37,882 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [253744287] [2020-08-21 23:54:37,882 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 23:54:37,882 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:54:37,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 23:54:37,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=420, Unknown=0, NotChecked=0, Total=702 [2020-08-21 23:54:37,883 INFO L87 Difference]: Start difference. First operand 73 states and 76 transitions. Second operand 27 states. [2020-08-21 23:54:38,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:54:38,108 INFO L93 Difference]: Finished difference Result 98 states and 104 transitions. [2020-08-21 23:54:38,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 23:54:38,109 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 68 [2020-08-21 23:54:38,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:54:38,110 INFO L225 Difference]: With dead ends: 98 [2020-08-21 23:54:38,110 INFO L226 Difference]: Without dead ends: 76 [2020-08-21 23:54:38,111 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=338, Invalid=532, Unknown=0, NotChecked=0, Total=870 [2020-08-21 23:54:38,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-21 23:54:38,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-21 23:54:38,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-21 23:54:38,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2020-08-21 23:54:38,115 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 68 [2020-08-21 23:54:38,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:54:38,116 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2020-08-21 23:54:38,116 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 23:54:38,116 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2020-08-21 23:54:38,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-21 23:54:38,116 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:38,116 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:38,117 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 23:54:38,117 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:38,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:38,117 INFO L82 PathProgramCache]: Analyzing trace with hash -928947374, now seen corresponding path program 14 times [2020-08-21 23:54:38,117 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:38,118 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [250554852] [2020-08-21 23:54:38,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:38,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:38,168 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:54:38,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:38,180 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:54:38,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:39,392 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 23:54:39,392 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [250554852] [2020-08-21 23:54:39,392 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:54:39,393 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-21 23:54:39,393 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2102815716] [2020-08-21 23:54:39,393 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-21 23:54:39,393 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:54:39,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-21 23:54:39,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=450, Unknown=0, NotChecked=0, Total=756 [2020-08-21 23:54:39,394 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand 28 states. [2020-08-21 23:54:39,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:54:39,723 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2020-08-21 23:54:39,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 23:54:39,723 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 70 [2020-08-21 23:54:39,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:54:39,724 INFO L225 Difference]: With dead ends: 100 [2020-08-21 23:54:39,725 INFO L226 Difference]: Without dead ends: 78 [2020-08-21 23:54:39,726 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=364, Invalid=566, Unknown=0, NotChecked=0, Total=930 [2020-08-21 23:54:39,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-21 23:54:39,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-21 23:54:39,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-21 23:54:39,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 80 transitions. [2020-08-21 23:54:39,732 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 80 transitions. Word has length 70 [2020-08-21 23:54:39,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:54:39,732 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 80 transitions. [2020-08-21 23:54:39,733 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-21 23:54:39,733 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 80 transitions. [2020-08-21 23:54:39,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-21 23:54:39,733 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:39,734 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:39,734 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 23:54:39,734 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:39,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:39,734 INFO L82 PathProgramCache]: Analyzing trace with hash 1030916052, now seen corresponding path program 15 times [2020-08-21 23:54:39,735 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:39,735 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1222054950] [2020-08-21 23:54:39,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:39,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:39,798 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:54:39,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:39,808 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:54:39,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:41,151 INFO L134 CoverageAnalysis]: Checked inductivity of 534 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 23:54:41,152 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1222054950] [2020-08-21 23:54:41,152 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:54:41,152 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-21 23:54:41,152 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1919976796] [2020-08-21 23:54:41,154 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-21 23:54:41,154 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:54:41,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-21 23:54:41,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=481, Unknown=0, NotChecked=0, Total=812 [2020-08-21 23:54:41,155 INFO L87 Difference]: Start difference. First operand 77 states and 80 transitions. Second operand 29 states. [2020-08-21 23:54:41,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:54:41,642 INFO L93 Difference]: Finished difference Result 102 states and 108 transitions. [2020-08-21 23:54:41,642 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-21 23:54:41,642 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 72 [2020-08-21 23:54:41,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:54:41,643 INFO L225 Difference]: With dead ends: 102 [2020-08-21 23:54:41,643 INFO L226 Difference]: Without dead ends: 80 [2020-08-21 23:54:41,644 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=391, Invalid=601, Unknown=0, NotChecked=0, Total=992 [2020-08-21 23:54:41,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-21 23:54:41,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-21 23:54:41,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-21 23:54:41,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 82 transitions. [2020-08-21 23:54:41,649 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 82 transitions. Word has length 72 [2020-08-21 23:54:41,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:54:41,649 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 82 transitions. [2020-08-21 23:54:41,649 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-21 23:54:41,649 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 82 transitions. [2020-08-21 23:54:41,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-21 23:54:41,650 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:41,650 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:41,650 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 23:54:41,650 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:41,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:41,651 INFO L82 PathProgramCache]: Analyzing trace with hash -1030974506, now seen corresponding path program 16 times [2020-08-21 23:54:41,651 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:41,651 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [7123560] [2020-08-21 23:54:41,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:41,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:41,748 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:54:41,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:41,760 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:54:41,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:42,958 INFO L134 CoverageAnalysis]: Checked inductivity of 581 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 23:54:42,958 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [7123560] [2020-08-21 23:54:42,959 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:54:42,959 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-21 23:54:42,959 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [953922458] [2020-08-21 23:54:42,959 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-21 23:54:42,959 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:54:42,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-21 23:54:42,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2020-08-21 23:54:42,960 INFO L87 Difference]: Start difference. First operand 79 states and 82 transitions. Second operand 30 states. [2020-08-21 23:54:43,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:54:43,248 INFO L93 Difference]: Finished difference Result 104 states and 110 transitions. [2020-08-21 23:54:43,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-21 23:54:43,248 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 74 [2020-08-21 23:54:43,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:54:43,249 INFO L225 Difference]: With dead ends: 104 [2020-08-21 23:54:43,249 INFO L226 Difference]: Without dead ends: 82 [2020-08-21 23:54:43,250 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=419, Invalid=637, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 23:54:43,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-21 23:54:43,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-21 23:54:43,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-21 23:54:43,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2020-08-21 23:54:43,255 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 74 [2020-08-21 23:54:43,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:54:43,256 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2020-08-21 23:54:43,256 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-21 23:54:43,256 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2020-08-21 23:54:43,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-21 23:54:43,256 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:43,257 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:43,257 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-21 23:54:43,257 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:43,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:43,257 INFO L82 PathProgramCache]: Analyzing trace with hash 1767090008, now seen corresponding path program 17 times [2020-08-21 23:54:43,258 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:43,258 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1027392311] [2020-08-21 23:54:43,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:43,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:43,313 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:54:43,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:43,325 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:54:43,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:44,595 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 23:54:44,596 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1027392311] [2020-08-21 23:54:44,596 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:54:44,596 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-21 23:54:44,596 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1563174544] [2020-08-21 23:54:44,596 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-21 23:54:44,597 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:54:44,597 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-21 23:54:44,597 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=546, Unknown=0, NotChecked=0, Total=930 [2020-08-21 23:54:44,597 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand 31 states. [2020-08-21 23:54:45,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:54:45,039 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2020-08-21 23:54:45,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-21 23:54:45,039 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 76 [2020-08-21 23:54:45,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:54:45,040 INFO L225 Difference]: With dead ends: 106 [2020-08-21 23:54:45,040 INFO L226 Difference]: Without dead ends: 84 [2020-08-21 23:54:45,041 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=448, Invalid=674, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 23:54:45,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-21 23:54:45,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-21 23:54:45,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-21 23:54:45,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2020-08-21 23:54:45,045 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 76 [2020-08-21 23:54:45,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:54:45,046 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2020-08-21 23:54:45,046 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-21 23:54:45,046 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2020-08-21 23:54:45,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-21 23:54:45,047 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:45,047 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:45,047 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-21 23:54:45,047 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:45,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:45,047 INFO L82 PathProgramCache]: Analyzing trace with hash 2057560666, now seen corresponding path program 18 times [2020-08-21 23:54:45,048 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:45,048 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1032633712] [2020-08-21 23:54:45,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:45,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:45,101 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:54:45,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:45,111 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:54:45,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:46,501 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 23:54:46,502 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1032633712] [2020-08-21 23:54:46,502 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:54:46,502 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-21 23:54:46,502 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1358413530] [2020-08-21 23:54:46,502 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-21 23:54:46,502 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:54:46,503 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-21 23:54:46,503 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=580, Unknown=0, NotChecked=0, Total=992 [2020-08-21 23:54:46,503 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand 32 states. [2020-08-21 23:54:46,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:54:46,924 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2020-08-21 23:54:46,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-21 23:54:46,924 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 78 [2020-08-21 23:54:46,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:54:46,926 INFO L225 Difference]: With dead ends: 108 [2020-08-21 23:54:46,926 INFO L226 Difference]: Without dead ends: 86 [2020-08-21 23:54:46,927 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=478, Invalid=712, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 23:54:46,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-21 23:54:46,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-21 23:54:46,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-21 23:54:46,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 88 transitions. [2020-08-21 23:54:46,931 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 88 transitions. Word has length 78 [2020-08-21 23:54:46,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:54:46,931 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 88 transitions. [2020-08-21 23:54:46,931 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-21 23:54:46,931 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 88 transitions. [2020-08-21 23:54:46,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-21 23:54:46,932 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:46,932 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:46,932 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-21 23:54:46,932 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:46,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:46,933 INFO L82 PathProgramCache]: Analyzing trace with hash 2026988764, now seen corresponding path program 19 times [2020-08-21 23:54:46,933 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:46,933 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1343847413] [2020-08-21 23:54:46,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:46,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:46,991 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:54:46,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:47,004 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:54:47,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:48,468 INFO L134 CoverageAnalysis]: Checked inductivity of 734 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 23:54:48,469 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1343847413] [2020-08-21 23:54:48,469 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:54:48,469 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-21 23:54:48,469 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [559376388] [2020-08-21 23:54:48,469 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-21 23:54:48,470 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:54:48,470 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-21 23:54:48,470 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=615, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 23:54:48,470 INFO L87 Difference]: Start difference. First operand 85 states and 88 transitions. Second operand 33 states. [2020-08-21 23:54:48,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:54:48,915 INFO L93 Difference]: Finished difference Result 110 states and 116 transitions. [2020-08-21 23:54:48,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-21 23:54:48,915 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 80 [2020-08-21 23:54:48,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:54:48,916 INFO L225 Difference]: With dead ends: 110 [2020-08-21 23:54:48,916 INFO L226 Difference]: Without dead ends: 88 [2020-08-21 23:54:48,917 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=509, Invalid=751, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 23:54:48,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-21 23:54:48,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-21 23:54:48,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-21 23:54:48,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2020-08-21 23:54:48,922 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 80 [2020-08-21 23:54:48,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:54:48,923 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2020-08-21 23:54:48,923 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-21 23:54:48,923 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2020-08-21 23:54:48,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-21 23:54:48,923 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:48,924 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:48,924 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-21 23:54:48,924 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:48,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:48,924 INFO L82 PathProgramCache]: Analyzing trace with hash -1582805282, now seen corresponding path program 20 times [2020-08-21 23:54:48,925 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:48,925 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [879300680] [2020-08-21 23:54:48,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:48,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:48,974 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:54:48,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:48,984 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:54:49,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:50,450 INFO L134 CoverageAnalysis]: Checked inductivity of 789 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 23:54:50,451 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [879300680] [2020-08-21 23:54:50,451 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:54:50,451 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-21 23:54:50,451 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [458628216] [2020-08-21 23:54:50,452 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-21 23:54:50,452 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:54:50,452 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-21 23:54:50,453 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=651, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 23:54:50,453 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand 34 states. [2020-08-21 23:54:50,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:54:50,928 INFO L93 Difference]: Finished difference Result 112 states and 118 transitions. [2020-08-21 23:54:50,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 23:54:50,929 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 82 [2020-08-21 23:54:50,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:54:50,930 INFO L225 Difference]: With dead ends: 112 [2020-08-21 23:54:50,930 INFO L226 Difference]: Without dead ends: 90 [2020-08-21 23:54:50,931 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=541, Invalid=791, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 23:54:50,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-21 23:54:50,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-21 23:54:50,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-21 23:54:50,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 92 transitions. [2020-08-21 23:54:50,937 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 92 transitions. Word has length 82 [2020-08-21 23:54:50,937 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:54:50,937 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 92 transitions. [2020-08-21 23:54:50,937 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-21 23:54:50,937 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 92 transitions. [2020-08-21 23:54:50,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-21 23:54:50,938 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:50,938 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:50,938 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-21 23:54:50,939 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:50,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:50,939 INFO L82 PathProgramCache]: Analyzing trace with hash -261308320, now seen corresponding path program 21 times [2020-08-21 23:54:50,939 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:50,939 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [640821609] [2020-08-21 23:54:50,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:50,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:50,999 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:54:51,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:51,010 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:54:51,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:52,714 INFO L134 CoverageAnalysis]: Checked inductivity of 846 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 23:54:52,715 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [640821609] [2020-08-21 23:54:52,715 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:54:52,715 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-21 23:54:52,715 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [727808065] [2020-08-21 23:54:52,716 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-21 23:54:52,716 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:54:52,716 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-21 23:54:52,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=688, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 23:54:52,717 INFO L87 Difference]: Start difference. First operand 89 states and 92 transitions. Second operand 35 states. [2020-08-21 23:54:53,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:54:53,166 INFO L93 Difference]: Finished difference Result 114 states and 120 transitions. [2020-08-21 23:54:53,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-21 23:54:53,167 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 84 [2020-08-21 23:54:53,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:54:53,168 INFO L225 Difference]: With dead ends: 114 [2020-08-21 23:54:53,168 INFO L226 Difference]: Without dead ends: 92 [2020-08-21 23:54:53,169 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=574, Invalid=832, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 23:54:53,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-21 23:54:53,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-21 23:54:53,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-21 23:54:53,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 94 transitions. [2020-08-21 23:54:53,175 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 94 transitions. Word has length 84 [2020-08-21 23:54:53,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:54:53,175 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 94 transitions. [2020-08-21 23:54:53,175 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-21 23:54:53,176 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 94 transitions. [2020-08-21 23:54:53,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-21 23:54:53,176 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:53,176 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:53,176 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-21 23:54:53,176 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:53,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:53,177 INFO L82 PathProgramCache]: Analyzing trace with hash -1613047454, now seen corresponding path program 22 times [2020-08-21 23:54:53,179 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:53,179 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1932709671] [2020-08-21 23:54:53,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:53,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:53,239 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:54:53,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:53,249 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:54:53,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:54,914 INFO L134 CoverageAnalysis]: Checked inductivity of 905 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 23:54:54,915 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1932709671] [2020-08-21 23:54:54,915 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:54:54,915 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-21 23:54:54,915 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1636598524] [2020-08-21 23:54:54,916 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-21 23:54:54,916 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:54:54,916 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-21 23:54:54,916 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=726, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 23:54:54,917 INFO L87 Difference]: Start difference. First operand 91 states and 94 transitions. Second operand 36 states. [2020-08-21 23:54:55,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:54:55,269 INFO L93 Difference]: Finished difference Result 116 states and 122 transitions. [2020-08-21 23:54:55,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-21 23:54:55,269 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 86 [2020-08-21 23:54:55,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:54:55,270 INFO L225 Difference]: With dead ends: 116 [2020-08-21 23:54:55,271 INFO L226 Difference]: Without dead ends: 94 [2020-08-21 23:54:55,272 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=608, Invalid=874, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 23:54:55,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-21 23:54:55,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-21 23:54:55,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-21 23:54:55,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 96 transitions. [2020-08-21 23:54:55,277 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 96 transitions. Word has length 86 [2020-08-21 23:54:55,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:54:55,277 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 96 transitions. [2020-08-21 23:54:55,277 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-21 23:54:55,277 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 96 transitions. [2020-08-21 23:54:55,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-21 23:54:55,278 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:55,278 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:55,278 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-21 23:54:55,278 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:55,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:55,279 INFO L82 PathProgramCache]: Analyzing trace with hash 740735460, now seen corresponding path program 23 times [2020-08-21 23:54:55,279 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:55,279 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [570673561] [2020-08-21 23:54:55,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:55,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:55,338 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:54:55,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:55,350 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:54:55,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:57,156 INFO L134 CoverageAnalysis]: Checked inductivity of 966 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 23:54:57,156 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [570673561] [2020-08-21 23:54:57,157 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:54:57,157 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-21 23:54:57,157 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [419406753] [2020-08-21 23:54:57,157 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-21 23:54:57,157 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:54:57,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-21 23:54:57,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=567, Invalid=765, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 23:54:57,158 INFO L87 Difference]: Start difference. First operand 93 states and 96 transitions. Second operand 37 states. [2020-08-21 23:54:57,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:54:57,658 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2020-08-21 23:54:57,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-21 23:54:57,659 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 88 [2020-08-21 23:54:57,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:54:57,661 INFO L225 Difference]: With dead ends: 118 [2020-08-21 23:54:57,662 INFO L226 Difference]: Without dead ends: 96 [2020-08-21 23:54:57,663 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=643, Invalid=917, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 23:54:57,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-21 23:54:57,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-21 23:54:57,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-21 23:54:57,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 98 transitions. [2020-08-21 23:54:57,669 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 98 transitions. Word has length 88 [2020-08-21 23:54:57,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:54:57,669 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 98 transitions. [2020-08-21 23:54:57,669 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-21 23:54:57,669 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 98 transitions. [2020-08-21 23:54:57,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-21 23:54:57,670 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:54:57,670 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:54:57,671 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-21 23:54:57,671 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:54:57,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:54:57,671 INFO L82 PathProgramCache]: Analyzing trace with hash -721649178, now seen corresponding path program 24 times [2020-08-21 23:54:57,672 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:54:57,672 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [659638211] [2020-08-21 23:54:57,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:54:57,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:57,745 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:54:57,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:57,755 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:54:57,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:54:59,660 INFO L134 CoverageAnalysis]: Checked inductivity of 1029 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 23:54:59,661 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [659638211] [2020-08-21 23:54:59,661 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:54:59,661 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-21 23:54:59,661 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [381846242] [2020-08-21 23:54:59,661 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-21 23:54:59,661 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:54:59,662 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-21 23:54:59,662 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=805, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 23:54:59,662 INFO L87 Difference]: Start difference. First operand 95 states and 98 transitions. Second operand 38 states. [2020-08-21 23:55:00,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:55:00,095 INFO L93 Difference]: Finished difference Result 120 states and 126 transitions. [2020-08-21 23:55:00,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-21 23:55:00,095 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 90 [2020-08-21 23:55:00,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:55:00,097 INFO L225 Difference]: With dead ends: 120 [2020-08-21 23:55:00,097 INFO L226 Difference]: Without dead ends: 98 [2020-08-21 23:55:00,098 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=679, Invalid=961, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 23:55:00,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-21 23:55:00,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-21 23:55:00,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-21 23:55:00,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 100 transitions. [2020-08-21 23:55:00,104 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 100 transitions. Word has length 90 [2020-08-21 23:55:00,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:55:00,104 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 100 transitions. [2020-08-21 23:55:00,104 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-21 23:55:00,104 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 100 transitions. [2020-08-21 23:55:00,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-21 23:55:00,105 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:55:00,105 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:55:00,105 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-21 23:55:00,105 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:55:00,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:55:00,106 INFO L82 PathProgramCache]: Analyzing trace with hash -1618980504, now seen corresponding path program 25 times [2020-08-21 23:55:00,106 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:55:00,106 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [959908109] [2020-08-21 23:55:00,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:55:00,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:55:00,177 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:55:00,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:55:00,187 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:55:00,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:55:02,227 INFO L134 CoverageAnalysis]: Checked inductivity of 1094 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 23:55:02,227 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [959908109] [2020-08-21 23:55:02,227 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:55:02,228 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-21 23:55:02,228 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [297796139] [2020-08-21 23:55:02,228 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-21 23:55:02,228 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:55:02,229 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-21 23:55:02,229 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=636, Invalid=846, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 23:55:02,230 INFO L87 Difference]: Start difference. First operand 97 states and 100 transitions. Second operand 39 states. [2020-08-21 23:55:02,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:55:02,608 INFO L93 Difference]: Finished difference Result 122 states and 128 transitions. [2020-08-21 23:55:02,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-21 23:55:02,609 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 92 [2020-08-21 23:55:02,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:55:02,610 INFO L225 Difference]: With dead ends: 122 [2020-08-21 23:55:02,610 INFO L226 Difference]: Without dead ends: 100 [2020-08-21 23:55:02,611 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=716, Invalid=1006, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 23:55:02,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-21 23:55:02,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-21 23:55:02,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-21 23:55:02,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2020-08-21 23:55:02,626 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 92 [2020-08-21 23:55:02,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:55:02,628 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2020-08-21 23:55:02,628 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-21 23:55:02,628 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2020-08-21 23:55:02,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-21 23:55:02,629 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:55:02,630 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:55:02,632 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-21 23:55:02,632 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:55:02,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:55:02,633 INFO L82 PathProgramCache]: Analyzing trace with hash -665958294, now seen corresponding path program 26 times [2020-08-21 23:55:02,633 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:55:02,633 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [395229357] [2020-08-21 23:55:02,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:55:02,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:55:02,724 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:55:02,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:55:02,736 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:55:02,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:55:04,838 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 23:55:04,838 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [395229357] [2020-08-21 23:55:04,839 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:55:04,839 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-21 23:55:04,839 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [575158663] [2020-08-21 23:55:04,839 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-21 23:55:04,839 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:55:04,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-21 23:55:04,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=672, Invalid=888, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 23:55:04,840 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand 40 states. [2020-08-21 23:55:05,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:55:05,191 INFO L93 Difference]: Finished difference Result 124 states and 130 transitions. [2020-08-21 23:55:05,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-21 23:55:05,192 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 94 [2020-08-21 23:55:05,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:55:05,193 INFO L225 Difference]: With dead ends: 124 [2020-08-21 23:55:05,193 INFO L226 Difference]: Without dead ends: 102 [2020-08-21 23:55:05,194 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=754, Invalid=1052, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 23:55:05,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-21 23:55:05,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-21 23:55:05,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-21 23:55:05,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 104 transitions. [2020-08-21 23:55:05,199 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 104 transitions. Word has length 94 [2020-08-21 23:55:05,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:55:05,199 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 104 transitions. [2020-08-21 23:55:05,199 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-21 23:55:05,199 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 104 transitions. [2020-08-21 23:55:05,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-21 23:55:05,200 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:55:05,200 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:55:05,200 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-21 23:55:05,200 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:55:05,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:55:05,201 INFO L82 PathProgramCache]: Analyzing trace with hash 360351468, now seen corresponding path program 27 times [2020-08-21 23:55:05,201 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:55:05,201 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [685918029] [2020-08-21 23:55:05,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:55:05,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:55:05,284 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:55:05,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:55:05,295 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:55:05,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:55:07,507 INFO L134 CoverageAnalysis]: Checked inductivity of 1230 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 23:55:07,507 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [685918029] [2020-08-21 23:55:07,507 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:55:07,508 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-21 23:55:07,508 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [94911266] [2020-08-21 23:55:07,508 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-21 23:55:07,508 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:55:07,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-21 23:55:07,509 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=709, Invalid=931, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 23:55:07,509 INFO L87 Difference]: Start difference. First operand 101 states and 104 transitions. Second operand 41 states. [2020-08-21 23:55:07,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:55:07,849 INFO L93 Difference]: Finished difference Result 126 states and 132 transitions. [2020-08-21 23:55:07,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-21 23:55:07,850 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 96 [2020-08-21 23:55:07,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:55:07,851 INFO L225 Difference]: With dead ends: 126 [2020-08-21 23:55:07,851 INFO L226 Difference]: Without dead ends: 104 [2020-08-21 23:55:07,852 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=793, Invalid=1099, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 23:55:07,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-21 23:55:07,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-21 23:55:07,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-21 23:55:07,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 106 transitions. [2020-08-21 23:55:07,859 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 106 transitions. Word has length 96 [2020-08-21 23:55:07,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:55:07,859 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 106 transitions. [2020-08-21 23:55:07,860 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-21 23:55:07,860 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 106 transitions. [2020-08-21 23:55:07,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-21 23:55:07,860 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:55:07,860 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:55:07,861 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-21 23:55:07,861 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:55:07,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:55:07,861 INFO L82 PathProgramCache]: Analyzing trace with hash -1198445330, now seen corresponding path program 28 times [2020-08-21 23:55:07,861 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:55:07,861 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1954064346] [2020-08-21 23:55:07,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:55:07,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:55:07,939 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:55:07,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:55:07,961 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:55:07,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:55:10,290 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 23:55:10,290 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1954064346] [2020-08-21 23:55:10,291 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:55:10,291 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-21 23:55:10,291 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [306925194] [2020-08-21 23:55:10,291 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-21 23:55:10,291 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:55:10,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-21 23:55:10,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=747, Invalid=975, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 23:55:10,292 INFO L87 Difference]: Start difference. First operand 103 states and 106 transitions. Second operand 42 states. [2020-08-21 23:55:10,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:55:10,774 INFO L93 Difference]: Finished difference Result 128 states and 134 transitions. [2020-08-21 23:55:10,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-21 23:55:10,774 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 98 [2020-08-21 23:55:10,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:55:10,776 INFO L225 Difference]: With dead ends: 128 [2020-08-21 23:55:10,776 INFO L226 Difference]: Without dead ends: 106 [2020-08-21 23:55:10,777 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=833, Invalid=1147, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 23:55:10,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-21 23:55:10,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-21 23:55:10,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-21 23:55:10,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 108 transitions. [2020-08-21 23:55:10,782 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 108 transitions. Word has length 98 [2020-08-21 23:55:10,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:55:10,783 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 108 transitions. [2020-08-21 23:55:10,783 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-21 23:55:10,783 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 108 transitions. [2020-08-21 23:55:10,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-21 23:55:10,784 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:55:10,784 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:55:10,784 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-21 23:55:10,784 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:55:10,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:55:10,785 INFO L82 PathProgramCache]: Analyzing trace with hash -258581904, now seen corresponding path program 29 times [2020-08-21 23:55:10,785 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:55:10,785 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [575755116] [2020-08-21 23:55:10,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:55:10,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:55:10,849 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:55:10,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:55:10,860 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:55:10,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:55:13,285 INFO L134 CoverageAnalysis]: Checked inductivity of 1374 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 23:55:13,285 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [575755116] [2020-08-21 23:55:13,285 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:55:13,285 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-21 23:55:13,286 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1859761680] [2020-08-21 23:55:13,286 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-21 23:55:13,286 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:55:13,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-21 23:55:13,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=786, Invalid=1020, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 23:55:13,287 INFO L87 Difference]: Start difference. First operand 105 states and 108 transitions. Second operand 43 states. [2020-08-21 23:55:13,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:55:13,889 INFO L93 Difference]: Finished difference Result 130 states and 136 transitions. [2020-08-21 23:55:13,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-21 23:55:13,889 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 100 [2020-08-21 23:55:13,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:55:13,890 INFO L225 Difference]: With dead ends: 130 [2020-08-21 23:55:13,890 INFO L226 Difference]: Without dead ends: 108 [2020-08-21 23:55:13,891 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=874, Invalid=1196, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 23:55:13,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-08-21 23:55:13,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-08-21 23:55:13,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-21 23:55:13,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 110 transitions. [2020-08-21 23:55:13,905 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 110 transitions. Word has length 100 [2020-08-21 23:55:13,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:55:13,906 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 110 transitions. [2020-08-21 23:55:13,906 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-21 23:55:13,906 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 110 transitions. [2020-08-21 23:55:13,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-21 23:55:13,906 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:55:13,907 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:55:13,907 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-21 23:55:13,907 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:55:13,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:55:13,907 INFO L82 PathProgramCache]: Analyzing trace with hash 1007038322, now seen corresponding path program 30 times [2020-08-21 23:55:13,907 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:55:13,908 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1572282263] [2020-08-21 23:55:13,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:55:13,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:55:13,984 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:55:13,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:55:14,001 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 23:55:14,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat