/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 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 16:23:15,813 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 16:23:15,816 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 16:23:15,840 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 16:23:15,840 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 16:23:15,841 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 16:23:15,843 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 16:23:15,844 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 16:23:15,846 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 16:23:15,847 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 16:23:15,848 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 16:23:15,849 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 16:23:15,849 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 16:23:15,850 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 16:23:15,851 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 16:23:15,852 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 16:23:15,853 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 16:23:15,854 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 16:23:15,856 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 16:23:15,858 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 16:23:15,860 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 16:23:15,861 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 16:23:15,862 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 16:23:15,863 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 16:23:15,865 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 16:23:15,869 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-18 16:23:15,870 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-18 16:23:15,870 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-18 16:23:15,871 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-18 16:23:15,872 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-18 16:23:15,872 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-18 16:23:15,873 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-18 16:23:15,873 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-18 16:23:15,873 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 16:23:15,874 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 16:23:15,875 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 16:23:15,876 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-18 16:23:15,900 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 16:23:15,901 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 16:23:15,902 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 16:23:15,902 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 16:23:15,902 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 16:23:15,902 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 16:23:15,903 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 16:23:15,903 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 16:23:15,903 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 16:23:15,903 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 16:23:15,903 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 16:23:15,904 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 16:23:15,904 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 16:23:15,904 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 16:23:15,904 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 16:23:15,904 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 16:23:15,905 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 16:23:15,905 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 16:23:15,905 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 16:23:15,905 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 16:23:15,905 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 16:23:15,906 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 16:23:15,906 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 16:23:15,906 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 16:23:15,906 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 16:23:15,907 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 16:23:15,907 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 16:23:15,907 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 16:23:15,907 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 16:23:15,907 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 [2020-08-18 16:23:16,253 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 16:23:16,265 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 16:23:16,269 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 16:23:16,270 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 16:23:16,271 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 16:23:16,271 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-08-18 16:23:16,345 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e5584f268/4ca787406ef3408ea3ebe14a912490d0/FLAG395ba0a1d [2020-08-18 16:23:16,811 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 16:23:16,812 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-08-18 16:23:16,817 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e5584f268/4ca787406ef3408ea3ebe14a912490d0/FLAG395ba0a1d [2020-08-18 16:23:17,220 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e5584f268/4ca787406ef3408ea3ebe14a912490d0 [2020-08-18 16:23:17,229 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 16:23:17,230 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 16:23:17,231 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 16:23:17,232 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 16:23:17,235 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 16:23:17,237 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 04:23:17" (1/1) ... [2020-08-18 16:23:17,241 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@b86a7e8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:23:17, skipping insertion in model container [2020-08-18 16:23:17,242 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 04:23:17" (1/1) ... [2020-08-18 16:23:17,251 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 16:23:17,274 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 16:23:17,541 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 16:23:17,548 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 16:23:17,570 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 16:23:17,588 INFO L208 MainTranslator]: Completed translation [2020-08-18 16:23:17,589 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:23:17 WrapperNode [2020-08-18 16:23:17,589 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 16:23:17,590 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 16:23:17,590 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 16:23:17,590 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 16:23:17,681 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:23:17" (1/1) ... [2020-08-18 16:23:17,681 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:23:17" (1/1) ... [2020-08-18 16:23:17,691 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:23:17" (1/1) ... [2020-08-18 16:23:17,692 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:23:17" (1/1) ... [2020-08-18 16:23:17,700 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:23:17" (1/1) ... [2020-08-18 16:23:17,706 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:23:17" (1/1) ... [2020-08-18 16:23:17,708 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:23:17" (1/1) ... [2020-08-18 16:23:17,710 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 16:23:17,711 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 16:23:17,711 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 16:23:17,711 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 16:23:17,712 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:23:17" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 16:23:17,774 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 16:23:17,774 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 16:23:17,774 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 16:23:17,775 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-08-18 16:23:17,775 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 16:23:17,775 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 16:23:17,775 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 16:23:17,775 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-18 16:23:17,775 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_pointer [2020-08-18 16:23:17,776 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-18 16:23:17,776 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-18 16:23:17,776 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-18 16:23:17,776 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 16:23:17,776 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-18 16:23:17,776 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-18 16:23:17,776 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 16:23:17,777 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 16:23:17,777 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 16:23:18,043 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 16:23:18,044 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-18 16:23:18,048 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 04:23:18 BoogieIcfgContainer [2020-08-18 16:23:18,049 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 16:23:18,050 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 16:23:18,050 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 16:23:18,054 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 16:23:18,054 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 04:23:17" (1/3) ... [2020-08-18 16:23:18,056 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@460d20fc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 04:23:18, skipping insertion in model container [2020-08-18 16:23:18,056 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:23:17" (2/3) ... [2020-08-18 16:23:18,056 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@460d20fc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 04:23:18, skipping insertion in model container [2020-08-18 16:23:18,057 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 04:23:18" (3/3) ... [2020-08-18 16:23:18,058 INFO L109 eAbstractionObserver]: Analyzing ICFG flag_loopdep.i [2020-08-18 16:23:18,071 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 16:23:18,082 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 16:23:18,105 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 16:23:18,139 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 16:23:18,140 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 16:23:18,140 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 16:23:18,140 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 16:23:18,140 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 16:23:18,141 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 16:23:18,141 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 16:23:18,141 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 16:23:18,180 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-08-18 16:23:18,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 16:23:18,194 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:18,198 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] [2020-08-18 16:23:18,199 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:18,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:18,213 INFO L82 PathProgramCache]: Analyzing trace with hash 1059974619, now seen corresponding path program 1 times [2020-08-18 16:23:18,239 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:18,240 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1965110238] [2020-08-18 16:23:18,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:18,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:18,515 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:18,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:18,545 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:18,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:18,558 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:23:18,559 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1965110238] [2020-08-18 16:23:18,561 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 16:23:18,562 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 16:23:18,563 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [835750872] [2020-08-18 16:23:18,568 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 16:23:18,569 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:18,585 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 16:23:18,586 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 16:23:18,588 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 4 states. [2020-08-18 16:23:18,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:18,742 INFO L93 Difference]: Finished difference Result 59 states and 76 transitions. [2020-08-18 16:23:18,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 16:23:18,744 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-18 16:23:18,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:18,755 INFO L225 Difference]: With dead ends: 59 [2020-08-18 16:23:18,756 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 16:23:18,760 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 [2020-08-18 16:23:18,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 16:23:18,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-18 16:23:18,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-18 16:23:18,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-08-18 16:23:18,813 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 20 [2020-08-18 16:23:18,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:18,814 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-08-18 16:23:18,814 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 16:23:18,814 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-08-18 16:23:18,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 16:23:18,815 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:18,815 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] [2020-08-18 16:23:18,816 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 16:23:18,816 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:18,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:18,817 INFO L82 PathProgramCache]: Analyzing trace with hash -931069882, now seen corresponding path program 1 times [2020-08-18 16:23:18,817 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:18,819 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1289319723] [2020-08-18 16:23:18,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:18,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:18,931 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:18,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:18,952 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:18,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:19,052 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:23:19,052 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1289319723] [2020-08-18 16:23:19,053 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 16:23:19,053 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-18 16:23:19,053 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1307951917] [2020-08-18 16:23:19,057 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 16:23:19,057 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:19,060 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 16:23:19,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-18 16:23:19,061 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2020-08-18 16:23:19,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:19,295 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-08-18 16:23:19,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 16:23:19,296 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-08-18 16:23:19,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:19,297 INFO L225 Difference]: With dead ends: 48 [2020-08-18 16:23:19,297 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 16:23:19,299 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 [2020-08-18 16:23:19,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 16:23:19,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-18 16:23:19,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 16:23:19,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-08-18 16:23:19,307 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-08-18 16:23:19,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:19,307 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-08-18 16:23:19,308 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 16:23:19,308 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-08-18 16:23:19,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 16:23:19,309 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:19,309 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] [2020-08-18 16:23:19,309 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 16:23:19,309 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:19,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:19,310 INFO L82 PathProgramCache]: Analyzing trace with hash 1782065480, now seen corresponding path program 1 times [2020-08-18 16:23:19,313 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:19,314 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [36875979] [2020-08-18 16:23:19,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:19,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:19,363 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:19,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:19,387 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:19,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:19,515 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:23:19,515 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [36875979] [2020-08-18 16:23:19,516 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:19,516 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 16:23:19,516 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1941970594] [2020-08-18 16:23:19,517 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 16:23:19,517 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:19,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 16:23:19,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-18 16:23:19,518 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 7 states. [2020-08-18 16:23:19,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:19,679 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-08-18 16:23:19,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 16:23:19,680 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2020-08-18 16:23:19,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:19,681 INFO L225 Difference]: With dead ends: 50 [2020-08-18 16:23:19,681 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 16:23:19,682 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 [2020-08-18 16:23:19,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 16:23:19,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-18 16:23:19,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 16:23:19,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-08-18 16:23:19,689 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 22 [2020-08-18 16:23:19,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:19,690 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-08-18 16:23:19,690 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 16:23:19,690 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-08-18 16:23:19,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 16:23:19,691 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:19,691 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] [2020-08-18 16:23:19,692 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 16:23:19,692 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:19,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:19,692 INFO L82 PathProgramCache]: Analyzing trace with hash 2059999690, now seen corresponding path program 2 times [2020-08-18 16:23:19,693 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:19,693 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [115771378] [2020-08-18 16:23:19,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:19,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:19,741 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:19,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:19,763 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:19,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:19,925 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:23:19,925 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [115771378] [2020-08-18 16:23:19,926 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:19,926 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 16:23:19,926 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1698480179] [2020-08-18 16:23:19,927 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 16:23:19,927 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:19,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 16:23:19,928 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-08-18 16:23:19,928 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2020-08-18 16:23:20,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:20,099 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-08-18 16:23:20,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 16:23:20,100 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-08-18 16:23:20,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:20,101 INFO L225 Difference]: With dead ends: 52 [2020-08-18 16:23:20,101 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 16:23:20,102 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-18 16:23:20,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 16:23:20,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-18 16:23:20,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 16:23:20,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-08-18 16:23:20,109 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 24 [2020-08-18 16:23:20,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:20,109 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-08-18 16:23:20,110 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 16:23:20,110 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-08-18 16:23:20,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-18 16:23:20,111 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:20,111 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] [2020-08-18 16:23:20,111 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 16:23:20,112 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:20,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:20,112 INFO L82 PathProgramCache]: Analyzing trace with hash -1428164148, now seen corresponding path program 3 times [2020-08-18 16:23:20,113 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:20,113 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1823558390] [2020-08-18 16:23:20,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:20,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:20,152 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:20,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:20,166 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:20,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:20,336 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:23:20,336 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1823558390] [2020-08-18 16:23:20,337 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:20,337 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 16:23:20,337 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1145774561] [2020-08-18 16:23:20,338 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 16:23:20,338 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:20,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 16:23:20,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-18 16:23:20,339 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 9 states. [2020-08-18 16:23:20,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:20,514 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-08-18 16:23:20,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 16:23:20,514 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-08-18 16:23:20,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:20,515 INFO L225 Difference]: With dead ends: 54 [2020-08-18 16:23:20,515 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 16:23:20,516 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 [2020-08-18 16:23:20,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 16:23:20,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-18 16:23:20,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 16:23:20,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-08-18 16:23:20,522 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 26 [2020-08-18 16:23:20,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:20,523 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-08-18 16:23:20,523 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 16:23:20,523 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-08-18 16:23:20,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 16:23:20,524 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:20,524 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] [2020-08-18 16:23:20,524 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 16:23:20,525 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:20,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:20,525 INFO L82 PathProgramCache]: Analyzing trace with hash 815845710, now seen corresponding path program 4 times [2020-08-18 16:23:20,525 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:20,526 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [849891729] [2020-08-18 16:23:20,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:20,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:20,568 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:20,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:20,587 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:20,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:20,834 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:23:20,834 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [849891729] [2020-08-18 16:23:20,834 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:20,835 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 16:23:20,836 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1072159512] [2020-08-18 16:23:20,836 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 16:23:20,842 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:20,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 16:23:20,843 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-08-18 16:23:20,843 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 10 states. [2020-08-18 16:23:21,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:21,025 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2020-08-18 16:23:21,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 16:23:21,026 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-08-18 16:23:21,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:21,027 INFO L225 Difference]: With dead ends: 56 [2020-08-18 16:23:21,027 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 16:23:21,028 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 [2020-08-18 16:23:21,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 16:23:21,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-18 16:23:21,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 16:23:21,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-08-18 16:23:21,034 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 28 [2020-08-18 16:23:21,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:21,035 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-08-18 16:23:21,035 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 16:23:21,035 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-08-18 16:23:21,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 16:23:21,036 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:21,036 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] [2020-08-18 16:23:21,037 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 16:23:21,037 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:21,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:21,038 INFO L82 PathProgramCache]: Analyzing trace with hash 1235736656, now seen corresponding path program 5 times [2020-08-18 16:23:21,038 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:21,038 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1685500874] [2020-08-18 16:23:21,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:21,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:21,089 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:21,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:21,100 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:21,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:21,306 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:23:21,307 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1685500874] [2020-08-18 16:23:21,307 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:21,307 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 16:23:21,308 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2130635349] [2020-08-18 16:23:21,308 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 16:23:21,308 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:21,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 16:23:21,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-18 16:23:21,309 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 11 states. [2020-08-18 16:23:21,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:21,507 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2020-08-18 16:23:21,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 16:23:21,508 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-18 16:23:21,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:21,510 INFO L225 Difference]: With dead ends: 58 [2020-08-18 16:23:21,510 INFO L226 Difference]: Without dead ends: 40 [2020-08-18 16:23:21,511 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 [2020-08-18 16:23:21,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-18 16:23:21,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-18 16:23:21,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 16:23:21,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-18 16:23:21,517 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 30 [2020-08-18 16:23:21,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:21,517 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-18 16:23:21,517 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 16:23:21,518 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-18 16:23:21,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 16:23:21,518 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:21,519 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] [2020-08-18 16:23:21,519 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 16:23:21,519 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:21,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:21,520 INFO L82 PathProgramCache]: Analyzing trace with hash 1024009938, now seen corresponding path program 6 times [2020-08-18 16:23:21,520 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:21,520 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [858444279] [2020-08-18 16:23:21,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:21,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:21,554 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:21,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:21,565 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:21,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:21,848 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:23:21,848 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [858444279] [2020-08-18 16:23:21,848 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:21,849 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 16:23:21,849 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [802699890] [2020-08-18 16:23:21,849 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 16:23:21,849 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:21,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 16:23:21,850 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-08-18 16:23:21,850 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 12 states. [2020-08-18 16:23:22,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:22,074 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2020-08-18 16:23:22,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 16:23:22,074 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-08-18 16:23:22,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:22,075 INFO L225 Difference]: With dead ends: 60 [2020-08-18 16:23:22,075 INFO L226 Difference]: Without dead ends: 42 [2020-08-18 16:23:22,078 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 [2020-08-18 16:23:22,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-18 16:23:22,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-18 16:23:22,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 16:23:22,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-18 16:23:22,086 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 32 [2020-08-18 16:23:22,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:22,087 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-18 16:23:22,087 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 16:23:22,087 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-18 16:23:22,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 16:23:22,088 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:22,088 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] [2020-08-18 16:23:22,088 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 16:23:22,089 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:22,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:22,089 INFO L82 PathProgramCache]: Analyzing trace with hash -581903148, now seen corresponding path program 7 times [2020-08-18 16:23:22,089 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:22,090 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [213091009] [2020-08-18 16:23:22,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:22,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:22,125 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:22,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:22,137 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:22,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:22,417 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:23:22,418 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [213091009] [2020-08-18 16:23:22,418 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:22,418 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 16:23:22,419 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1744268530] [2020-08-18 16:23:22,419 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 16:23:22,419 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:22,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 16:23:22,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2020-08-18 16:23:22,420 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 13 states. [2020-08-18 16:23:22,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:22,601 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-08-18 16:23:22,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 16:23:22,602 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-08-18 16:23:22,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:22,603 INFO L225 Difference]: With dead ends: 62 [2020-08-18 16:23:22,603 INFO L226 Difference]: Without dead ends: 44 [2020-08-18 16:23:22,604 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 [2020-08-18 16:23:22,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-18 16:23:22,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-18 16:23:22,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 16:23:22,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2020-08-18 16:23:22,610 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 34 [2020-08-18 16:23:22,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:22,611 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2020-08-18 16:23:22,611 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 16:23:22,611 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2020-08-18 16:23:22,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 16:23:22,612 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:22,612 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] [2020-08-18 16:23:22,612 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 16:23:22,613 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:22,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:22,613 INFO L82 PathProgramCache]: Analyzing trace with hash -1971119530, now seen corresponding path program 8 times [2020-08-18 16:23:22,613 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:22,614 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [535170835] [2020-08-18 16:23:22,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:22,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:22,647 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:22,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:22,659 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:22,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:22,999 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 16:23:22,999 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [535170835] [2020-08-18 16:23:23,000 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:23,000 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 16:23:23,000 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [42456967] [2020-08-18 16:23:23,000 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 16:23:23,001 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:23,001 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 16:23:23,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-08-18 16:23:23,001 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand 14 states. [2020-08-18 16:23:23,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:23,229 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2020-08-18 16:23:23,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 16:23:23,229 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-18 16:23:23,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:23,230 INFO L225 Difference]: With dead ends: 64 [2020-08-18 16:23:23,230 INFO L226 Difference]: Without dead ends: 46 [2020-08-18 16:23:23,231 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 [2020-08-18 16:23:23,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-18 16:23:23,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-18 16:23:23,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-18 16:23:23,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2020-08-18 16:23:23,238 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 36 [2020-08-18 16:23:23,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:23,238 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2020-08-18 16:23:23,238 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 16:23:23,238 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2020-08-18 16:23:23,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 16:23:23,239 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:23,239 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] [2020-08-18 16:23:23,239 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 16:23:23,240 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:23,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:23,240 INFO L82 PathProgramCache]: Analyzing trace with hash -1273233576, now seen corresponding path program 9 times [2020-08-18 16:23:23,240 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:23,240 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1651185446] [2020-08-18 16:23:23,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:23,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:23,283 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:23,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:23,296 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:23,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:23,309 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-18 16:23:23,310 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1651185446] [2020-08-18 16:23:23,310 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 16:23:23,310 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 16:23:23,310 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1160939162] [2020-08-18 16:23:23,311 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 16:23:23,311 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:23,311 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 16:23:23,312 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 16:23:23,312 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 5 states. [2020-08-18 16:23:23,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:23,400 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2020-08-18 16:23:23,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 16:23:23,400 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2020-08-18 16:23:23,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:23,403 INFO L225 Difference]: With dead ends: 65 [2020-08-18 16:23:23,403 INFO L226 Difference]: Without dead ends: 53 [2020-08-18 16:23:23,404 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 [2020-08-18 16:23:23,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-18 16:23:23,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 46. [2020-08-18 16:23:23,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 16:23:23,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-08-18 16:23:23,429 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 38 [2020-08-18 16:23:23,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:23,429 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-08-18 16:23:23,429 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 16:23:23,432 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-08-18 16:23:23,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 16:23:23,433 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:23,433 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] [2020-08-18 16:23:23,433 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 16:23:23,433 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:23,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:23,433 INFO L82 PathProgramCache]: Analyzing trace with hash -1053921041, now seen corresponding path program 1 times [2020-08-18 16:23:23,434 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:23,434 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1579889966] [2020-08-18 16:23:23,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:23,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:23,508 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:23,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:23,519 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:23,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:23,539 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-18 16:23:23,539 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1579889966] [2020-08-18 16:23:23,539 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:23,539 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 16:23:23,540 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [336122761] [2020-08-18 16:23:23,541 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 16:23:23,541 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:23,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 16:23:23,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-18 16:23:23,543 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 6 states. [2020-08-18 16:23:23,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:23,673 INFO L93 Difference]: Finished difference Result 73 states and 85 transitions. [2020-08-18 16:23:23,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 16:23:23,673 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 41 [2020-08-18 16:23:23,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:23,674 INFO L225 Difference]: With dead ends: 73 [2020-08-18 16:23:23,675 INFO L226 Difference]: Without dead ends: 61 [2020-08-18 16:23:23,675 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 [2020-08-18 16:23:23,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-18 16:23:23,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 49. [2020-08-18 16:23:23,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 16:23:23,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2020-08-18 16:23:23,681 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 41 [2020-08-18 16:23:23,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:23,681 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2020-08-18 16:23:23,681 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 16:23:23,681 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2020-08-18 16:23:23,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 16:23:23,682 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:23,682 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] [2020-08-18 16:23:23,683 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 16:23:23,683 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:23,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:23,683 INFO L82 PathProgramCache]: Analyzing trace with hash -159448072, now seen corresponding path program 2 times [2020-08-18 16:23:23,683 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:23,684 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1680869368] [2020-08-18 16:23:23,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:23,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:23,721 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:23,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:23,734 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:23,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:23,747 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2020-08-18 16:23:23,747 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1680869368] [2020-08-18 16:23:23,748 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 16:23:23,748 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 16:23:23,748 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [114421074] [2020-08-18 16:23:23,748 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 16:23:23,749 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:23,749 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 16:23:23,749 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 16:23:23,749 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 5 states. [2020-08-18 16:23:23,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:23,826 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2020-08-18 16:23:23,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 16:23:23,826 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 44 [2020-08-18 16:23:23,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:23,827 INFO L225 Difference]: With dead ends: 69 [2020-08-18 16:23:23,827 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 16:23:23,828 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 [2020-08-18 16:23:23,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 16:23:23,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-18 16:23:23,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 16:23:23,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2020-08-18 16:23:23,833 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 44 [2020-08-18 16:23:23,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:23,833 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2020-08-18 16:23:23,833 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 16:23:23,834 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2020-08-18 16:23:23,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 16:23:23,834 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:23,835 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] [2020-08-18 16:23:23,835 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 16:23:23,835 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:23,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:23,835 INFO L82 PathProgramCache]: Analyzing trace with hash -1139281096, now seen corresponding path program 1 times [2020-08-18 16:23:23,836 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:23,836 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1637521286] [2020-08-18 16:23:23,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:23,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:23,870 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:23,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:23,885 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:23,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:24,274 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:24,275 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1637521286] [2020-08-18 16:23:24,275 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:24,276 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 16:23:24,276 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [92605856] [2020-08-18 16:23:24,276 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 16:23:24,277 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:24,277 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 16:23:24,277 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2020-08-18 16:23:24,277 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand 15 states. [2020-08-18 16:23:24,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:24,465 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2020-08-18 16:23:24,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 16:23:24,466 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2020-08-18 16:23:24,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:24,467 INFO L225 Difference]: With dead ends: 74 [2020-08-18 16:23:24,467 INFO L226 Difference]: Without dead ends: 52 [2020-08-18 16:23:24,468 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=104, Invalid=202, Unknown=0, NotChecked=0, Total=306 [2020-08-18 16:23:24,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-18 16:23:24,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-18 16:23:24,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-18 16:23:24,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2020-08-18 16:23:24,475 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 44 [2020-08-18 16:23:24,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:24,475 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2020-08-18 16:23:24,475 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 16:23:24,476 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2020-08-18 16:23:24,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-18 16:23:24,476 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:24,477 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] [2020-08-18 16:23:24,477 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 16:23:24,477 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:24,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:24,477 INFO L82 PathProgramCache]: Analyzing trace with hash 763672122, now seen corresponding path program 2 times [2020-08-18 16:23:24,478 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:24,478 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [794168838] [2020-08-18 16:23:24,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:24,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:24,550 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:24,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:24,563 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:24,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:25,022 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:25,022 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [794168838] [2020-08-18 16:23:25,023 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:25,023 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 16:23:25,023 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [367359386] [2020-08-18 16:23:25,023 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 16:23:25,024 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:25,024 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 16:23:25,024 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2020-08-18 16:23:25,024 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand 16 states. [2020-08-18 16:23:25,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:25,245 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2020-08-18 16:23:25,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 16:23:25,246 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 46 [2020-08-18 16:23:25,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:25,246 INFO L225 Difference]: With dead ends: 76 [2020-08-18 16:23:25,247 INFO L226 Difference]: Without dead ends: 54 [2020-08-18 16:23:25,248 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 [2020-08-18 16:23:25,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-18 16:23:25,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-18 16:23:25,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-18 16:23:25,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2020-08-18 16:23:25,253 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 46 [2020-08-18 16:23:25,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:25,254 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2020-08-18 16:23:25,254 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 16:23:25,254 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2020-08-18 16:23:25,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-18 16:23:25,255 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:25,255 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] [2020-08-18 16:23:25,255 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 16:23:25,255 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:25,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:25,256 INFO L82 PathProgramCache]: Analyzing trace with hash -154353476, now seen corresponding path program 3 times [2020-08-18 16:23:25,256 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:25,256 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [649490302] [2020-08-18 16:23:25,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:25,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:25,293 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:25,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:25,303 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:25,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:25,764 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:25,764 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [649490302] [2020-08-18 16:23:25,767 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:25,767 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 16:23:25,768 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [727804282] [2020-08-18 16:23:25,768 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 16:23:25,768 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:25,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 16:23:25,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=175, Unknown=0, NotChecked=0, Total=272 [2020-08-18 16:23:25,769 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 17 states. [2020-08-18 16:23:26,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:26,028 INFO L93 Difference]: Finished difference Result 78 states and 84 transitions. [2020-08-18 16:23:26,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 16:23:26,028 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-18 16:23:26,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:26,029 INFO L225 Difference]: With dead ends: 78 [2020-08-18 16:23:26,029 INFO L226 Difference]: Without dead ends: 56 [2020-08-18 16:23:26,030 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=133, Invalid=247, Unknown=0, NotChecked=0, Total=380 [2020-08-18 16:23:26,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-18 16:23:26,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-18 16:23:26,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-18 16:23:26,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2020-08-18 16:23:26,035 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 48 [2020-08-18 16:23:26,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:26,035 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2020-08-18 16:23:26,035 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 16:23:26,035 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2020-08-18 16:23:26,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-18 16:23:26,036 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:26,036 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] [2020-08-18 16:23:26,036 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 16:23:26,036 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:26,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:26,037 INFO L82 PathProgramCache]: Analyzing trace with hash -1908657474, now seen corresponding path program 4 times [2020-08-18 16:23:26,037 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:26,037 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1380611957] [2020-08-18 16:23:26,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:26,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:26,075 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:26,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:26,085 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:26,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:26,593 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:26,594 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1380611957] [2020-08-18 16:23:26,594 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:26,594 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 16:23:26,594 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1539791896] [2020-08-18 16:23:26,594 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 16:23:26,595 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:26,595 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 16:23:26,595 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=195, Unknown=0, NotChecked=0, Total=306 [2020-08-18 16:23:26,595 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand 18 states. [2020-08-18 16:23:26,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:26,858 INFO L93 Difference]: Finished difference Result 80 states and 86 transitions. [2020-08-18 16:23:26,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 16:23:26,859 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2020-08-18 16:23:26,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:26,859 INFO L225 Difference]: With dead ends: 80 [2020-08-18 16:23:26,860 INFO L226 Difference]: Without dead ends: 58 [2020-08-18 16:23:26,860 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=149, Invalid=271, Unknown=0, NotChecked=0, Total=420 [2020-08-18 16:23:26,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-18 16:23:26,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-18 16:23:26,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-18 16:23:26,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2020-08-18 16:23:26,866 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 50 [2020-08-18 16:23:26,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:26,866 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2020-08-18 16:23:26,866 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 16:23:26,866 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2020-08-18 16:23:26,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-18 16:23:26,867 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:26,867 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] [2020-08-18 16:23:26,867 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 16:23:26,868 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:26,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:26,868 INFO L82 PathProgramCache]: Analyzing trace with hash 127347776, now seen corresponding path program 5 times [2020-08-18 16:23:26,868 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:26,868 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1164328600] [2020-08-18 16:23:26,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:26,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:26,911 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:26,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:26,922 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:26,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:27,487 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:27,488 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1164328600] [2020-08-18 16:23:27,488 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:27,488 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 16:23:27,488 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1831658661] [2020-08-18 16:23:27,489 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 16:23:27,489 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:27,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 16:23:27,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=216, Unknown=0, NotChecked=0, Total=342 [2020-08-18 16:23:27,490 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand 19 states. [2020-08-18 16:23:27,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:27,747 INFO L93 Difference]: Finished difference Result 82 states and 88 transitions. [2020-08-18 16:23:27,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 16:23:27,747 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 52 [2020-08-18 16:23:27,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:27,748 INFO L225 Difference]: With dead ends: 82 [2020-08-18 16:23:27,748 INFO L226 Difference]: Without dead ends: 60 [2020-08-18 16:23:27,750 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=166, Invalid=296, Unknown=0, NotChecked=0, Total=462 [2020-08-18 16:23:27,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-18 16:23:27,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-18 16:23:27,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-18 16:23:27,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2020-08-18 16:23:27,755 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 52 [2020-08-18 16:23:27,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:27,756 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2020-08-18 16:23:27,756 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 16:23:27,756 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2020-08-18 16:23:27,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-18 16:23:27,757 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:27,757 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] [2020-08-18 16:23:27,757 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 16:23:27,757 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:27,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:27,758 INFO L82 PathProgramCache]: Analyzing trace with hash -1776693950, now seen corresponding path program 6 times [2020-08-18 16:23:27,760 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:27,760 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1059364785] [2020-08-18 16:23:27,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:27,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:27,808 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:27,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:27,818 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:27,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:28,414 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:28,415 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1059364785] [2020-08-18 16:23:28,415 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:28,415 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 16:23:28,415 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [688062354] [2020-08-18 16:23:28,415 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 16:23:28,416 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:28,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 16:23:28,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=238, Unknown=0, NotChecked=0, Total=380 [2020-08-18 16:23:28,416 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand 20 states. [2020-08-18 16:23:28,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:28,715 INFO L93 Difference]: Finished difference Result 84 states and 90 transitions. [2020-08-18 16:23:28,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 16:23:28,720 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 54 [2020-08-18 16:23:28,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:28,721 INFO L225 Difference]: With dead ends: 84 [2020-08-18 16:23:28,721 INFO L226 Difference]: Without dead ends: 62 [2020-08-18 16:23:28,722 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 [2020-08-18 16:23:28,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-18 16:23:28,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-18 16:23:28,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-18 16:23:28,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2020-08-18 16:23:28,731 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 54 [2020-08-18 16:23:28,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:28,732 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2020-08-18 16:23:28,732 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 16:23:28,732 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2020-08-18 16:23:28,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-18 16:23:28,733 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:28,733 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] [2020-08-18 16:23:28,733 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 16:23:28,733 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:28,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:28,734 INFO L82 PathProgramCache]: Analyzing trace with hash -1904724540, now seen corresponding path program 7 times [2020-08-18 16:23:28,735 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:28,735 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1120410730] [2020-08-18 16:23:28,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:28,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:28,798 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:28,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:28,812 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:28,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:29,546 INFO L134 CoverageAnalysis]: Checked inductivity of 230 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:29,546 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1120410730] [2020-08-18 16:23:29,546 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:29,546 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 16:23:29,547 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [544071733] [2020-08-18 16:23:29,548 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 16:23:29,548 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:29,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 16:23:29,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=261, Unknown=0, NotChecked=0, Total=420 [2020-08-18 16:23:29,549 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand 21 states. [2020-08-18 16:23:29,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:29,774 INFO L93 Difference]: Finished difference Result 86 states and 92 transitions. [2020-08-18 16:23:29,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 16:23:29,775 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 56 [2020-08-18 16:23:29,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:29,776 INFO L225 Difference]: With dead ends: 86 [2020-08-18 16:23:29,776 INFO L226 Difference]: Without dead ends: 64 [2020-08-18 16:23:29,777 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 [2020-08-18 16:23:29,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-18 16:23:29,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-18 16:23:29,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-18 16:23:29,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2020-08-18 16:23:29,781 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 56 [2020-08-18 16:23:29,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:29,782 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2020-08-18 16:23:29,782 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 16:23:29,782 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2020-08-18 16:23:29,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-18 16:23:29,783 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:29,783 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] [2020-08-18 16:23:29,783 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 16:23:29,783 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:29,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:29,783 INFO L82 PathProgramCache]: Analyzing trace with hash -388069946, now seen corresponding path program 8 times [2020-08-18 16:23:29,784 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:29,784 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2108808319] [2020-08-18 16:23:29,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:29,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:29,823 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:29,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:29,833 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:29,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:30,724 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:30,725 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2108808319] [2020-08-18 16:23:30,726 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:30,726 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 16:23:30,726 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [281467168] [2020-08-18 16:23:30,729 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 16:23:30,729 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:30,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 16:23:30,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=285, Unknown=0, NotChecked=0, Total=462 [2020-08-18 16:23:30,730 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand 22 states. [2020-08-18 16:23:31,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:31,019 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2020-08-18 16:23:31,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 16:23:31,019 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 58 [2020-08-18 16:23:31,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:31,020 INFO L225 Difference]: With dead ends: 88 [2020-08-18 16:23:31,021 INFO L226 Difference]: Without dead ends: 66 [2020-08-18 16:23:31,022 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 [2020-08-18 16:23:31,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-18 16:23:31,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-18 16:23:31,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-18 16:23:31,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 68 transitions. [2020-08-18 16:23:31,034 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 68 transitions. Word has length 58 [2020-08-18 16:23:31,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:31,034 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 68 transitions. [2020-08-18 16:23:31,034 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 16:23:31,035 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 68 transitions. [2020-08-18 16:23:31,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-18 16:23:31,035 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:31,035 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] [2020-08-18 16:23:31,036 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 16:23:31,036 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:31,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:31,036 INFO L82 PathProgramCache]: Analyzing trace with hash 1123081544, now seen corresponding path program 9 times [2020-08-18 16:23:31,036 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:31,037 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1596402145] [2020-08-18 16:23:31,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:31,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:31,113 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:31,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:31,125 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:31,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:31,910 INFO L134 CoverageAnalysis]: Checked inductivity of 294 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:31,910 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1596402145] [2020-08-18 16:23:31,910 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:31,910 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 16:23:31,911 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [127331259] [2020-08-18 16:23:31,911 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 16:23:31,911 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:31,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 16:23:31,912 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=310, Unknown=0, NotChecked=0, Total=506 [2020-08-18 16:23:31,912 INFO L87 Difference]: Start difference. First operand 65 states and 68 transitions. Second operand 23 states. [2020-08-18 16:23:32,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:32,230 INFO L93 Difference]: Finished difference Result 90 states and 96 transitions. [2020-08-18 16:23:32,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 16:23:32,231 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 60 [2020-08-18 16:23:32,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:32,232 INFO L225 Difference]: With dead ends: 90 [2020-08-18 16:23:32,232 INFO L226 Difference]: Without dead ends: 68 [2020-08-18 16:23:32,233 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=244, Invalid=406, Unknown=0, NotChecked=0, Total=650 [2020-08-18 16:23:32,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-18 16:23:32,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-18 16:23:32,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-18 16:23:32,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2020-08-18 16:23:32,238 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 60 [2020-08-18 16:23:32,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:32,239 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2020-08-18 16:23:32,239 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 16:23:32,239 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2020-08-18 16:23:32,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-18 16:23:32,240 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:32,241 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] [2020-08-18 16:23:32,241 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 16:23:32,241 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:32,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:32,242 INFO L82 PathProgramCache]: Analyzing trace with hash 1640717386, now seen corresponding path program 10 times [2020-08-18 16:23:32,242 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:32,242 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [425430413] [2020-08-18 16:23:32,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:32,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:32,289 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:32,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:32,301 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:32,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:33,156 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:33,156 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [425430413] [2020-08-18 16:23:33,156 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:33,157 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 16:23:33,157 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1280701897] [2020-08-18 16:23:33,157 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 16:23:33,157 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:33,158 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 16:23:33,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=336, Unknown=0, NotChecked=0, Total=552 [2020-08-18 16:23:33,158 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 24 states. [2020-08-18 16:23:33,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:33,434 INFO L93 Difference]: Finished difference Result 92 states and 98 transitions. [2020-08-18 16:23:33,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 16:23:33,435 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 62 [2020-08-18 16:23:33,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:33,436 INFO L225 Difference]: With dead ends: 92 [2020-08-18 16:23:33,436 INFO L226 Difference]: Without dead ends: 70 [2020-08-18 16:23:33,437 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 [2020-08-18 16:23:33,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-18 16:23:33,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-18 16:23:33,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-18 16:23:33,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2020-08-18 16:23:33,442 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 62 [2020-08-18 16:23:33,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:33,442 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2020-08-18 16:23:33,442 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 16:23:33,443 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2020-08-18 16:23:33,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-18 16:23:33,443 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:33,443 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] [2020-08-18 16:23:33,443 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 16:23:33,444 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:33,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:33,444 INFO L82 PathProgramCache]: Analyzing trace with hash 872555212, now seen corresponding path program 11 times [2020-08-18 16:23:33,444 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:33,444 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1303615536] [2020-08-18 16:23:33,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:33,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:33,490 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:33,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:33,502 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:33,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:34,382 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:34,382 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1303615536] [2020-08-18 16:23:34,382 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:34,382 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 16:23:34,383 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [943900494] [2020-08-18 16:23:34,383 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 16:23:34,383 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:34,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 16:23:34,384 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=363, Unknown=0, NotChecked=0, Total=600 [2020-08-18 16:23:34,384 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand 25 states. [2020-08-18 16:23:34,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:34,728 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2020-08-18 16:23:34,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 16:23:34,729 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 64 [2020-08-18 16:23:34,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:34,730 INFO L225 Difference]: With dead ends: 94 [2020-08-18 16:23:34,730 INFO L226 Difference]: Without dead ends: 72 [2020-08-18 16:23:34,731 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=289, Invalid=467, Unknown=0, NotChecked=0, Total=756 [2020-08-18 16:23:34,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-18 16:23:34,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-18 16:23:34,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-18 16:23:34,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 74 transitions. [2020-08-18 16:23:34,736 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 74 transitions. Word has length 64 [2020-08-18 16:23:34,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:34,737 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 74 transitions. [2020-08-18 16:23:34,737 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 16:23:34,737 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 74 transitions. [2020-08-18 16:23:34,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-18 16:23:34,737 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:34,737 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] [2020-08-18 16:23:34,738 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 16:23:34,738 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:34,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:34,738 INFO L82 PathProgramCache]: Analyzing trace with hash 1403080910, now seen corresponding path program 12 times [2020-08-18 16:23:34,738 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:34,739 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1034536431] [2020-08-18 16:23:34,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:34,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:34,784 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:34,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:34,795 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:34,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:35,760 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:35,761 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1034536431] [2020-08-18 16:23:35,761 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:35,761 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 16:23:35,761 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2032011357] [2020-08-18 16:23:35,762 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 16:23:35,762 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:35,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 16:23:35,763 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2020-08-18 16:23:35,763 INFO L87 Difference]: Start difference. First operand 71 states and 74 transitions. Second operand 26 states. [2020-08-18 16:23:36,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:36,109 INFO L93 Difference]: Finished difference Result 96 states and 102 transitions. [2020-08-18 16:23:36,109 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 16:23:36,109 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 66 [2020-08-18 16:23:36,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:36,111 INFO L225 Difference]: With dead ends: 96 [2020-08-18 16:23:36,111 INFO L226 Difference]: Without dead ends: 74 [2020-08-18 16:23:36,112 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 [2020-08-18 16:23:36,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-18 16:23:36,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-18 16:23:36,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-18 16:23:36,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 76 transitions. [2020-08-18 16:23:36,117 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 76 transitions. Word has length 66 [2020-08-18 16:23:36,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:36,117 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 76 transitions. [2020-08-18 16:23:36,117 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 16:23:36,117 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 76 transitions. [2020-08-18 16:23:36,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-18 16:23:36,118 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:36,118 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] [2020-08-18 16:23:36,118 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 16:23:36,118 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:36,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:36,119 INFO L82 PathProgramCache]: Analyzing trace with hash 137168464, now seen corresponding path program 13 times [2020-08-18 16:23:36,119 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:36,119 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [747106954] [2020-08-18 16:23:36,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:36,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:36,164 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:36,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:36,174 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:36,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:37,187 INFO L134 CoverageAnalysis]: Checked inductivity of 446 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:37,187 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [747106954] [2020-08-18 16:23:37,188 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:37,188 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 16:23:37,188 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1642751675] [2020-08-18 16:23:37,188 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 16:23:37,188 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:37,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 16:23:37,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=420, Unknown=0, NotChecked=0, Total=702 [2020-08-18 16:23:37,189 INFO L87 Difference]: Start difference. First operand 73 states and 76 transitions. Second operand 27 states. [2020-08-18 16:23:37,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:37,416 INFO L93 Difference]: Finished difference Result 98 states and 104 transitions. [2020-08-18 16:23:37,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 16:23:37,416 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 68 [2020-08-18 16:23:37,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:37,417 INFO L225 Difference]: With dead ends: 98 [2020-08-18 16:23:37,417 INFO L226 Difference]: Without dead ends: 76 [2020-08-18 16:23:37,418 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 [2020-08-18 16:23:37,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-18 16:23:37,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-18 16:23:37,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-18 16:23:37,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2020-08-18 16:23:37,422 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 68 [2020-08-18 16:23:37,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:37,423 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2020-08-18 16:23:37,423 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 16:23:37,423 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2020-08-18 16:23:37,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-18 16:23:37,423 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:37,424 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] [2020-08-18 16:23:37,424 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 16:23:37,424 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:37,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:37,424 INFO L82 PathProgramCache]: Analyzing trace with hash -928947374, now seen corresponding path program 14 times [2020-08-18 16:23:37,425 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:37,425 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1512873746] [2020-08-18 16:23:37,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:37,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:37,463 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:37,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:37,474 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:37,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:38,546 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:38,546 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1512873746] [2020-08-18 16:23:38,546 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:38,546 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 16:23:38,546 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1547635277] [2020-08-18 16:23:38,547 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 16:23:38,547 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:38,547 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 16:23:38,547 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=450, Unknown=0, NotChecked=0, Total=756 [2020-08-18 16:23:38,548 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand 28 states. [2020-08-18 16:23:38,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:38,875 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2020-08-18 16:23:38,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 16:23:38,876 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 70 [2020-08-18 16:23:38,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:38,876 INFO L225 Difference]: With dead ends: 100 [2020-08-18 16:23:38,876 INFO L226 Difference]: Without dead ends: 78 [2020-08-18 16:23:38,877 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=364, Invalid=566, Unknown=0, NotChecked=0, Total=930 [2020-08-18 16:23:38,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-18 16:23:38,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-18 16:23:38,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-18 16:23:38,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 80 transitions. [2020-08-18 16:23:38,882 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 80 transitions. Word has length 70 [2020-08-18 16:23:38,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:38,882 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 80 transitions. [2020-08-18 16:23:38,882 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 16:23:38,883 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 80 transitions. [2020-08-18 16:23:38,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-18 16:23:38,883 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:38,883 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] [2020-08-18 16:23:38,884 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 16:23:38,884 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:38,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:38,884 INFO L82 PathProgramCache]: Analyzing trace with hash 1030916052, now seen corresponding path program 15 times [2020-08-18 16:23:38,884 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:38,884 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1224951282] [2020-08-18 16:23:38,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:38,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:38,940 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:38,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:38,951 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:38,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:40,120 INFO L134 CoverageAnalysis]: Checked inductivity of 534 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:40,120 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1224951282] [2020-08-18 16:23:40,121 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:40,121 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 16:23:40,121 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1202696698] [2020-08-18 16:23:40,121 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 16:23:40,121 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:40,122 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 16:23:40,122 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=481, Unknown=0, NotChecked=0, Total=812 [2020-08-18 16:23:40,122 INFO L87 Difference]: Start difference. First operand 77 states and 80 transitions. Second operand 29 states. [2020-08-18 16:23:40,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:40,500 INFO L93 Difference]: Finished difference Result 102 states and 108 transitions. [2020-08-18 16:23:40,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 16:23:40,500 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 72 [2020-08-18 16:23:40,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:40,501 INFO L225 Difference]: With dead ends: 102 [2020-08-18 16:23:40,501 INFO L226 Difference]: Without dead ends: 80 [2020-08-18 16:23:40,502 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=391, Invalid=601, Unknown=0, NotChecked=0, Total=992 [2020-08-18 16:23:40,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-18 16:23:40,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-18 16:23:40,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-18 16:23:40,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 82 transitions. [2020-08-18 16:23:40,507 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 82 transitions. Word has length 72 [2020-08-18 16:23:40,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:40,508 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 82 transitions. [2020-08-18 16:23:40,508 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 16:23:40,508 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 82 transitions. [2020-08-18 16:23:40,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-18 16:23:40,508 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:40,508 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] [2020-08-18 16:23:40,509 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 16:23:40,509 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:40,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:40,509 INFO L82 PathProgramCache]: Analyzing trace with hash -1030974506, now seen corresponding path program 16 times [2020-08-18 16:23:40,509 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:40,509 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1379190275] [2020-08-18 16:23:40,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:40,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:40,559 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:40,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:40,569 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:40,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:41,784 INFO L134 CoverageAnalysis]: Checked inductivity of 581 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:41,785 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1379190275] [2020-08-18 16:23:41,785 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:41,785 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 16:23:41,785 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [567498288] [2020-08-18 16:23:41,786 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 16:23:41,786 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:41,786 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 16:23:41,786 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2020-08-18 16:23:41,787 INFO L87 Difference]: Start difference. First operand 79 states and 82 transitions. Second operand 30 states. [2020-08-18 16:23:42,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:42,077 INFO L93 Difference]: Finished difference Result 104 states and 110 transitions. [2020-08-18 16:23:42,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 16:23:42,078 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 74 [2020-08-18 16:23:42,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:42,079 INFO L225 Difference]: With dead ends: 104 [2020-08-18 16:23:42,079 INFO L226 Difference]: Without dead ends: 82 [2020-08-18 16:23:42,080 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 [2020-08-18 16:23:42,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-18 16:23:42,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-18 16:23:42,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-18 16:23:42,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2020-08-18 16:23:42,085 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 74 [2020-08-18 16:23:42,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:42,086 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2020-08-18 16:23:42,086 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 16:23:42,086 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2020-08-18 16:23:42,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-18 16:23:42,086 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:42,087 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] [2020-08-18 16:23:42,087 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 16:23:42,087 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:42,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:42,087 INFO L82 PathProgramCache]: Analyzing trace with hash 1767090008, now seen corresponding path program 17 times [2020-08-18 16:23:42,088 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:42,088 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [676491324] [2020-08-18 16:23:42,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:42,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:42,153 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:42,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:42,164 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:42,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:43,500 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:43,501 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [676491324] [2020-08-18 16:23:43,501 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:43,501 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 16:23:43,501 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1563943297] [2020-08-18 16:23:43,502 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 16:23:43,502 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:43,502 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 16:23:43,503 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=546, Unknown=0, NotChecked=0, Total=930 [2020-08-18 16:23:43,503 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand 31 states. [2020-08-18 16:23:43,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:43,914 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2020-08-18 16:23:43,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 16:23:43,914 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 76 [2020-08-18 16:23:43,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:43,915 INFO L225 Difference]: With dead ends: 106 [2020-08-18 16:23:43,915 INFO L226 Difference]: Without dead ends: 84 [2020-08-18 16:23:43,916 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 [2020-08-18 16:23:43,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-18 16:23:43,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-18 16:23:43,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-18 16:23:43,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2020-08-18 16:23:43,922 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 76 [2020-08-18 16:23:43,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:43,922 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2020-08-18 16:23:43,922 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 16:23:43,922 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2020-08-18 16:23:43,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-18 16:23:43,923 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:43,923 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] [2020-08-18 16:23:43,923 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 16:23:43,923 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:43,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:43,924 INFO L82 PathProgramCache]: Analyzing trace with hash 2057560666, now seen corresponding path program 18 times [2020-08-18 16:23:43,924 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:43,924 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [823423705] [2020-08-18 16:23:43,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:43,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:43,976 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:43,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:43,989 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:44,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:45,372 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:45,372 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [823423705] [2020-08-18 16:23:45,372 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:45,373 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 16:23:45,373 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [412092807] [2020-08-18 16:23:45,373 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 16:23:45,373 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:45,373 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 16:23:45,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=580, Unknown=0, NotChecked=0, Total=992 [2020-08-18 16:23:45,374 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand 32 states. [2020-08-18 16:23:45,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:45,802 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2020-08-18 16:23:45,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 16:23:45,803 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 78 [2020-08-18 16:23:45,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:45,804 INFO L225 Difference]: With dead ends: 108 [2020-08-18 16:23:45,804 INFO L226 Difference]: Without dead ends: 86 [2020-08-18 16:23:45,805 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 [2020-08-18 16:23:45,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-18 16:23:45,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-18 16:23:45,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-18 16:23:45,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 88 transitions. [2020-08-18 16:23:45,810 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 88 transitions. Word has length 78 [2020-08-18 16:23:45,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:45,810 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 88 transitions. [2020-08-18 16:23:45,810 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 16:23:45,810 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 88 transitions. [2020-08-18 16:23:45,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-18 16:23:45,810 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:45,811 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] [2020-08-18 16:23:45,811 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 16:23:45,811 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:45,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:45,811 INFO L82 PathProgramCache]: Analyzing trace with hash 2026988764, now seen corresponding path program 19 times [2020-08-18 16:23:45,811 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:45,812 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [289715512] [2020-08-18 16:23:45,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:45,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:45,870 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:45,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:45,880 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:45,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:47,409 INFO L134 CoverageAnalysis]: Checked inductivity of 734 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:47,409 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [289715512] [2020-08-18 16:23:47,410 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:47,410 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 16:23:47,410 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [40481879] [2020-08-18 16:23:47,411 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 16:23:47,411 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:47,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 16:23:47,412 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=615, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 16:23:47,412 INFO L87 Difference]: Start difference. First operand 85 states and 88 transitions. Second operand 33 states. [2020-08-18 16:23:47,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:47,824 INFO L93 Difference]: Finished difference Result 110 states and 116 transitions. [2020-08-18 16:23:47,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 16:23:47,825 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 80 [2020-08-18 16:23:47,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:47,826 INFO L225 Difference]: With dead ends: 110 [2020-08-18 16:23:47,826 INFO L226 Difference]: Without dead ends: 88 [2020-08-18 16:23:47,827 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=509, Invalid=751, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 16:23:47,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-18 16:23:47,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-18 16:23:47,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-18 16:23:47,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2020-08-18 16:23:47,832 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 80 [2020-08-18 16:23:47,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:47,832 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2020-08-18 16:23:47,832 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 16:23:47,832 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2020-08-18 16:23:47,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-18 16:23:47,833 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:47,833 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] [2020-08-18 16:23:47,833 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 16:23:47,833 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:47,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:47,834 INFO L82 PathProgramCache]: Analyzing trace with hash -1582805282, now seen corresponding path program 20 times [2020-08-18 16:23:47,834 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:47,834 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [960729144] [2020-08-18 16:23:47,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:47,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:47,885 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:47,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:47,897 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:47,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:49,398 INFO L134 CoverageAnalysis]: Checked inductivity of 789 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:49,398 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [960729144] [2020-08-18 16:23:49,398 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:49,398 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 16:23:49,399 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2006587387] [2020-08-18 16:23:49,399 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 16:23:49,399 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:49,399 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 16:23:49,400 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=651, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 16:23:49,400 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand 34 states. [2020-08-18 16:23:49,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:49,846 INFO L93 Difference]: Finished difference Result 112 states and 118 transitions. [2020-08-18 16:23:49,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 16:23:49,846 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 82 [2020-08-18 16:23:49,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:49,848 INFO L225 Difference]: With dead ends: 112 [2020-08-18 16:23:49,848 INFO L226 Difference]: Without dead ends: 90 [2020-08-18 16:23:49,849 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 [2020-08-18 16:23:49,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-18 16:23:49,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-18 16:23:49,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-18 16:23:49,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 92 transitions. [2020-08-18 16:23:49,855 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 92 transitions. Word has length 82 [2020-08-18 16:23:49,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:49,855 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 92 transitions. [2020-08-18 16:23:49,855 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 16:23:49,855 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 92 transitions. [2020-08-18 16:23:49,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-18 16:23:49,856 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:49,856 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] [2020-08-18 16:23:49,856 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 16:23:49,856 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:49,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:49,857 INFO L82 PathProgramCache]: Analyzing trace with hash -261308320, now seen corresponding path program 21 times [2020-08-18 16:23:49,857 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:49,857 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2068755139] [2020-08-18 16:23:49,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:49,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:49,919 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:49,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:49,930 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:49,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:51,543 INFO L134 CoverageAnalysis]: Checked inductivity of 846 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:51,543 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2068755139] [2020-08-18 16:23:51,543 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:51,543 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 16:23:51,544 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1155073298] [2020-08-18 16:23:51,544 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 16:23:51,544 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:51,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 16:23:51,545 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=688, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 16:23:51,545 INFO L87 Difference]: Start difference. First operand 89 states and 92 transitions. Second operand 35 states. [2020-08-18 16:23:51,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:51,992 INFO L93 Difference]: Finished difference Result 114 states and 120 transitions. [2020-08-18 16:23:51,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 16:23:51,993 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 84 [2020-08-18 16:23:51,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:51,994 INFO L225 Difference]: With dead ends: 114 [2020-08-18 16:23:51,994 INFO L226 Difference]: Without dead ends: 92 [2020-08-18 16:23:51,995 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 [2020-08-18 16:23:51,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-18 16:23:51,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-18 16:23:51,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-18 16:23:51,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 94 transitions. [2020-08-18 16:23:52,000 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 94 transitions. Word has length 84 [2020-08-18 16:23:52,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:52,000 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 94 transitions. [2020-08-18 16:23:52,000 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 16:23:52,000 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 94 transitions. [2020-08-18 16:23:52,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-18 16:23:52,001 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:52,001 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] [2020-08-18 16:23:52,001 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 16:23:52,002 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:52,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:52,002 INFO L82 PathProgramCache]: Analyzing trace with hash -1613047454, now seen corresponding path program 22 times [2020-08-18 16:23:52,002 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:52,002 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [462968166] [2020-08-18 16:23:52,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:52,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:52,056 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:52,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:52,067 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:52,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:53,688 INFO L134 CoverageAnalysis]: Checked inductivity of 905 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:53,689 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [462968166] [2020-08-18 16:23:53,689 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:53,689 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 16:23:53,689 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1082831307] [2020-08-18 16:23:53,690 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 16:23:53,690 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:53,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 16:23:53,690 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=726, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 16:23:53,691 INFO L87 Difference]: Start difference. First operand 91 states and 94 transitions. Second operand 36 states. [2020-08-18 16:23:54,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:54,039 INFO L93 Difference]: Finished difference Result 116 states and 122 transitions. [2020-08-18 16:23:54,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 16:23:54,039 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 86 [2020-08-18 16:23:54,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:54,040 INFO L225 Difference]: With dead ends: 116 [2020-08-18 16:23:54,041 INFO L226 Difference]: Without dead ends: 94 [2020-08-18 16:23:54,042 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 [2020-08-18 16:23:54,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-18 16:23:54,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-18 16:23:54,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-18 16:23:54,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 96 transitions. [2020-08-18 16:23:54,049 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 96 transitions. Word has length 86 [2020-08-18 16:23:54,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:54,049 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 96 transitions. [2020-08-18 16:23:54,049 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 16:23:54,049 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 96 transitions. [2020-08-18 16:23:54,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-18 16:23:54,050 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:54,050 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] [2020-08-18 16:23:54,050 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 16:23:54,051 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:54,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:54,051 INFO L82 PathProgramCache]: Analyzing trace with hash 740735460, now seen corresponding path program 23 times [2020-08-18 16:23:54,051 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:54,051 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2043566620] [2020-08-18 16:23:54,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:54,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:54,107 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:54,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:54,118 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:54,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:55,922 INFO L134 CoverageAnalysis]: Checked inductivity of 966 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:55,922 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2043566620] [2020-08-18 16:23:55,922 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:55,922 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 16:23:55,923 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1972136334] [2020-08-18 16:23:55,923 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 16:23:55,923 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:55,923 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 16:23:55,924 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=567, Invalid=765, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 16:23:55,924 INFO L87 Difference]: Start difference. First operand 93 states and 96 transitions. Second operand 37 states. [2020-08-18 16:23:56,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:56,431 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2020-08-18 16:23:56,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 16:23:56,431 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 88 [2020-08-18 16:23:56,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:56,434 INFO L225 Difference]: With dead ends: 118 [2020-08-18 16:23:56,435 INFO L226 Difference]: Without dead ends: 96 [2020-08-18 16:23:56,436 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 [2020-08-18 16:23:56,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-18 16:23:56,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-18 16:23:56,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-18 16:23:56,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 98 transitions. [2020-08-18 16:23:56,441 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 98 transitions. Word has length 88 [2020-08-18 16:23:56,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:56,442 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 98 transitions. [2020-08-18 16:23:56,442 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 16:23:56,442 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 98 transitions. [2020-08-18 16:23:56,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-18 16:23:56,444 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:56,444 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] [2020-08-18 16:23:56,444 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 16:23:56,444 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:56,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:56,445 INFO L82 PathProgramCache]: Analyzing trace with hash -721649178, now seen corresponding path program 24 times [2020-08-18 16:23:56,445 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:56,445 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1955698746] [2020-08-18 16:23:56,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:56,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:56,504 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:56,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:56,515 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:56,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:58,438 INFO L134 CoverageAnalysis]: Checked inductivity of 1029 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:23:58,438 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1955698746] [2020-08-18 16:23:58,438 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:23:58,438 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 16:23:58,438 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [660977264] [2020-08-18 16:23:58,439 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 16:23:58,439 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:23:58,440 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 16:23:58,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=805, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 16:23:58,440 INFO L87 Difference]: Start difference. First operand 95 states and 98 transitions. Second operand 38 states. [2020-08-18 16:23:58,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:23:58,872 INFO L93 Difference]: Finished difference Result 120 states and 126 transitions. [2020-08-18 16:23:58,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 16:23:58,873 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 90 [2020-08-18 16:23:58,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:23:58,874 INFO L225 Difference]: With dead ends: 120 [2020-08-18 16:23:58,874 INFO L226 Difference]: Without dead ends: 98 [2020-08-18 16:23:58,876 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 [2020-08-18 16:23:58,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-18 16:23:58,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-18 16:23:58,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-18 16:23:58,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 100 transitions. [2020-08-18 16:23:58,882 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 100 transitions. Word has length 90 [2020-08-18 16:23:58,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:23:58,882 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 100 transitions. [2020-08-18 16:23:58,882 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 16:23:58,882 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 100 transitions. [2020-08-18 16:23:58,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-18 16:23:58,883 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:23:58,883 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] [2020-08-18 16:23:58,883 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 16:23:58,883 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:23:58,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:23:58,884 INFO L82 PathProgramCache]: Analyzing trace with hash -1618980504, now seen corresponding path program 25 times [2020-08-18 16:23:58,884 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:23:58,884 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [672296268] [2020-08-18 16:23:58,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:23:58,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:58,941 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:23:58,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:23:58,951 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:23:58,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:00,993 INFO L134 CoverageAnalysis]: Checked inductivity of 1094 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:24:00,993 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [672296268] [2020-08-18 16:24:00,994 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:00,994 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 16:24:00,994 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1534935357] [2020-08-18 16:24:00,994 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 16:24:00,995 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:00,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 16:24:00,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=636, Invalid=846, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 16:24:00,996 INFO L87 Difference]: Start difference. First operand 97 states and 100 transitions. Second operand 39 states. [2020-08-18 16:24:01,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:01,348 INFO L93 Difference]: Finished difference Result 122 states and 128 transitions. [2020-08-18 16:24:01,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 16:24:01,349 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 92 [2020-08-18 16:24:01,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:01,350 INFO L225 Difference]: With dead ends: 122 [2020-08-18 16:24:01,350 INFO L226 Difference]: Without dead ends: 100 [2020-08-18 16:24:01,352 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 [2020-08-18 16:24:01,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-18 16:24:01,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-18 16:24:01,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-18 16:24:01,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2020-08-18 16:24:01,357 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 92 [2020-08-18 16:24:01,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:01,357 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2020-08-18 16:24:01,358 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 16:24:01,358 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2020-08-18 16:24:01,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-18 16:24:01,358 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:01,358 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] [2020-08-18 16:24:01,359 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 16:24:01,359 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:01,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:01,359 INFO L82 PathProgramCache]: Analyzing trace with hash -665958294, now seen corresponding path program 26 times [2020-08-18 16:24:01,359 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:01,360 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1789709205] [2020-08-18 16:24:01,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:01,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:01,426 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:01,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:01,436 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:24:01,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:03,520 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:24:03,521 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1789709205] [2020-08-18 16:24:03,521 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:03,521 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 16:24:03,521 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [47965140] [2020-08-18 16:24:03,521 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 16:24:03,522 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:03,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 16:24:03,522 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=672, Invalid=888, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 16:24:03,523 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand 40 states. [2020-08-18 16:24:03,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:03,849 INFO L93 Difference]: Finished difference Result 124 states and 130 transitions. [2020-08-18 16:24:03,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 16:24:03,849 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 94 [2020-08-18 16:24:03,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:03,850 INFO L225 Difference]: With dead ends: 124 [2020-08-18 16:24:03,851 INFO L226 Difference]: Without dead ends: 102 [2020-08-18 16:24:03,852 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 [2020-08-18 16:24:03,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-18 16:24:03,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-18 16:24:03,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-18 16:24:03,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 104 transitions. [2020-08-18 16:24:03,857 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 104 transitions. Word has length 94 [2020-08-18 16:24:03,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:03,857 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 104 transitions. [2020-08-18 16:24:03,858 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 16:24:03,858 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 104 transitions. [2020-08-18 16:24:03,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-18 16:24:03,858 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:03,858 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] [2020-08-18 16:24:03,859 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 16:24:03,859 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:03,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:03,859 INFO L82 PathProgramCache]: Analyzing trace with hash 360351468, now seen corresponding path program 27 times [2020-08-18 16:24:03,859 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:03,859 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [978454081] [2020-08-18 16:24:03,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:03,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:03,920 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:03,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:03,931 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:24:03,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:06,173 INFO L134 CoverageAnalysis]: Checked inductivity of 1230 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:24:06,173 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [978454081] [2020-08-18 16:24:06,173 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:06,174 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 16:24:06,174 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1292186792] [2020-08-18 16:24:06,174 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 16:24:06,174 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:06,175 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 16:24:06,175 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=709, Invalid=931, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 16:24:06,175 INFO L87 Difference]: Start difference. First operand 101 states and 104 transitions. Second operand 41 states. [2020-08-18 16:24:06,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:06,531 INFO L93 Difference]: Finished difference Result 126 states and 132 transitions. [2020-08-18 16:24:06,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 16:24:06,531 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 96 [2020-08-18 16:24:06,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:06,532 INFO L225 Difference]: With dead ends: 126 [2020-08-18 16:24:06,533 INFO L226 Difference]: Without dead ends: 104 [2020-08-18 16:24:06,534 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 [2020-08-18 16:24:06,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-18 16:24:06,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-18 16:24:06,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-18 16:24:06,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 106 transitions. [2020-08-18 16:24:06,539 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 106 transitions. Word has length 96 [2020-08-18 16:24:06,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:06,539 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 106 transitions. [2020-08-18 16:24:06,539 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-18 16:24:06,539 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 106 transitions. [2020-08-18 16:24:06,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-18 16:24:06,540 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:06,540 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] [2020-08-18 16:24:06,540 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 16:24:06,540 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:06,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:06,541 INFO L82 PathProgramCache]: Analyzing trace with hash -1198445330, now seen corresponding path program 28 times [2020-08-18 16:24:06,541 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:06,541 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1661875256] [2020-08-18 16:24:06,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:06,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:06,595 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:06,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:06,604 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:24:06,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:08,961 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:24:08,962 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1661875256] [2020-08-18 16:24:08,962 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:08,962 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-18 16:24:08,962 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1835052970] [2020-08-18 16:24:08,963 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-18 16:24:08,963 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:08,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-18 16:24:08,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=747, Invalid=975, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 16:24:08,964 INFO L87 Difference]: Start difference. First operand 103 states and 106 transitions. Second operand 42 states. [2020-08-18 16:24:09,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:09,423 INFO L93 Difference]: Finished difference Result 128 states and 134 transitions. [2020-08-18 16:24:09,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-18 16:24:09,423 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 98 [2020-08-18 16:24:09,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:09,425 INFO L225 Difference]: With dead ends: 128 [2020-08-18 16:24:09,425 INFO L226 Difference]: Without dead ends: 106 [2020-08-18 16:24:09,426 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 [2020-08-18 16:24:09,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-18 16:24:09,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-18 16:24:09,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-18 16:24:09,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 108 transitions. [2020-08-18 16:24:09,432 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 108 transitions. Word has length 98 [2020-08-18 16:24:09,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:09,432 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 108 transitions. [2020-08-18 16:24:09,432 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-18 16:24:09,432 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 108 transitions. [2020-08-18 16:24:09,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-18 16:24:09,433 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:09,433 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] [2020-08-18 16:24:09,433 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-18 16:24:09,434 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:09,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:09,434 INFO L82 PathProgramCache]: Analyzing trace with hash -258581904, now seen corresponding path program 29 times [2020-08-18 16:24:09,434 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:09,434 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2066046047] [2020-08-18 16:24:09,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:09,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:09,508 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:09,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:09,521 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:24:09,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:11,950 INFO L134 CoverageAnalysis]: Checked inductivity of 1374 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 16:24:11,950 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2066046047] [2020-08-18 16:24:11,950 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 16:24:11,950 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-18 16:24:11,951 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [822801175] [2020-08-18 16:24:11,951 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-18 16:24:11,951 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 16:24:11,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-18 16:24:11,952 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=786, Invalid=1020, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 16:24:11,952 INFO L87 Difference]: Start difference. First operand 105 states and 108 transitions. Second operand 43 states. [2020-08-18 16:24:12,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 16:24:12,520 INFO L93 Difference]: Finished difference Result 130 states and 136 transitions. [2020-08-18 16:24:12,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-18 16:24:12,521 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 100 [2020-08-18 16:24:12,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 16:24:12,522 INFO L225 Difference]: With dead ends: 130 [2020-08-18 16:24:12,522 INFO L226 Difference]: Without dead ends: 108 [2020-08-18 16:24:12,523 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 [2020-08-18 16:24:12,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-08-18 16:24:12,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-08-18 16:24:12,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-18 16:24:12,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 110 transitions. [2020-08-18 16:24:12,532 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 110 transitions. Word has length 100 [2020-08-18 16:24:12,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 16:24:12,533 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 110 transitions. [2020-08-18 16:24:12,533 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-18 16:24:12,533 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 110 transitions. [2020-08-18 16:24:12,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-18 16:24:12,535 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 16:24:12,535 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] [2020-08-18 16:24:12,535 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-18 16:24:12,536 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 16:24:12,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 16:24:12,536 INFO L82 PathProgramCache]: Analyzing trace with hash 1007038322, now seen corresponding path program 30 times [2020-08-18 16:24:12,536 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 16:24:12,536 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1715515168] [2020-08-18 16:24:12,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 16:24:12,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:12,610 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 16:24:12,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 16:24:12,627 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 16:24:12,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat