/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=0.4 -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 [2020-08-19 00:26:54,012 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-19 00:26:54,015 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-19 00:26:54,045 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-19 00:26:54,045 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-19 00:26:54,054 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-19 00:26:54,055 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-19 00:26:54,058 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-19 00:26:54,061 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-19 00:26:54,062 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-19 00:26:54,063 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-19 00:26:54,065 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-19 00:26:54,065 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 00:26:54,066 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 00:26:54,069 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 00:26:54,071 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 00:26:54,072 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 00:26:54,074 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 00:26:54,076 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 00:26:54,080 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 00:26:54,084 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 00:26:54,085 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 00:26:54,086 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 00:26:54,087 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 00:26:54,099 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-19 00:26:54,109 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 00:26:54,110 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 00:26:54,111 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 00:26:54,112 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-19 00:26:54,154 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 00:26:54,155 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 00:26:54,156 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 00:26:54,157 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 00:26:54,157 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 00:26:54,157 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 00:26:54,157 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 00:26:54,158 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 00:26:54,158 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 00:26:54,158 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 00:26:54,159 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 00:26:54,159 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 00:26:54,159 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 00:26:54,160 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 00:26:54,160 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 00:26:54,160 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 00:26:54,160 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 00:26:54,161 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 00:26:54,161 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 00:26:54,161 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 00:26:54,161 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 00:26:54,161 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 00:26:54,162 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 00:26:54,162 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 00:26:54,162 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 00:26:54,162 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 00:26:54,162 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 00:26:54,163 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 00:26:54,163 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 00:26:54,163 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.4; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.4; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.4; [2020-08-19 00:26:54,447 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 00:26:54,459 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 00:26:54,462 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 00:26:54,464 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 00:26:54,464 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 00:26:54,465 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-08-19 00:26:54,526 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5113931ad/1beb7a46eda045e0bb67ca4e56884101/FLAG76d4c0312 [2020-08-19 00:26:54,983 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 00:26:54,984 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-08-19 00:26:54,990 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5113931ad/1beb7a46eda045e0bb67ca4e56884101/FLAG76d4c0312 [2020-08-19 00:26:55,337 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5113931ad/1beb7a46eda045e0bb67ca4e56884101 [2020-08-19 00:26:55,348 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 00:26:55,350 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 00:26:55,351 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 00:26:55,352 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 00:26:55,355 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 00:26:55,356 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 12:26:55" (1/1) ... [2020-08-19 00:26:55,360 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4428e4e8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 12:26:55, skipping insertion in model container [2020-08-19 00:26:55,360 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 12:26:55" (1/1) ... [2020-08-19 00:26:55,368 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 00:26:55,394 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 00:26:55,601 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 00:26:55,608 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 00:26:55,629 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 00:26:55,645 INFO L208 MainTranslator]: Completed translation [2020-08-19 00:26:55,646 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 12:26:55 WrapperNode [2020-08-19 00:26:55,646 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 00:26:55,647 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 00:26:55,647 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 00:26:55,647 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 00:26:55,733 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 12:26:55" (1/1) ... [2020-08-19 00:26:55,733 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 12:26:55" (1/1) ... [2020-08-19 00:26:55,746 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 12:26:55" (1/1) ... [2020-08-19 00:26:55,746 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 12:26:55" (1/1) ... [2020-08-19 00:26:55,754 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 12:26:55" (1/1) ... [2020-08-19 00:26:55,760 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 12:26:55" (1/1) ... [2020-08-19 00:26:55,762 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 12:26:55" (1/1) ... [2020-08-19 00:26:55,764 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 00:26:55,765 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 00:26:55,765 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 00:26:55,765 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 00:26:55,766 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 12:26:55" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 00:26:55,829 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 00:26:55,829 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 00:26:55,829 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-19 00:26:55,829 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-08-19 00:26:55,829 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 00:26:55,830 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 00:26:55,830 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-19 00:26:55,830 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-19 00:26:55,830 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_pointer [2020-08-19 00:26:55,830 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-19 00:26:55,830 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-19 00:26:55,831 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-19 00:26:55,831 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 00:26:55,831 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-19 00:26:55,831 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-19 00:26:55,831 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-19 00:26:55,832 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 00:26:55,832 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 00:26:56,134 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 00:26:56,134 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-19 00:26:56,139 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 12:26:56 BoogieIcfgContainer [2020-08-19 00:26:56,139 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 00:26:56,149 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 00:26:56,149 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 00:26:56,154 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 00:26:56,154 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 12:26:55" (1/3) ... [2020-08-19 00:26:56,155 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@417ff9bd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 12:26:56, skipping insertion in model container [2020-08-19 00:26:56,155 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 12:26:55" (2/3) ... [2020-08-19 00:26:56,158 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@417ff9bd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 12:26:56, skipping insertion in model container [2020-08-19 00:26:56,158 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 12:26:56" (3/3) ... [2020-08-19 00:26:56,163 INFO L109 eAbstractionObserver]: Analyzing ICFG flag_loopdep.i [2020-08-19 00:26:56,184 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 00:26:56,190 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 00:26:56,204 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 00:26:56,225 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 00:26:56,225 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 00:26:56,225 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 00:26:56,225 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 00:26:56,225 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 00:26:56,226 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 00:26:56,226 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 00:26:56,226 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 00:26:56,244 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-08-19 00:26:56,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-19 00:26:56,249 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:26:56,250 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] [2020-08-19 00:26:56,250 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:26:56,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:26:56,257 INFO L82 PathProgramCache]: Analyzing trace with hash 1059974619, now seen corresponding path program 1 times [2020-08-19 00:26:56,266 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:26:56,267 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2006040545] [2020-08-19 00:26:56,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:26:56,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:26:56,461 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:26:56,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:26:56,487 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:26:56,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:26:56,499 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:26:56,501 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2006040545] [2020-08-19 00:26:56,503 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 00:26:56,503 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-19 00:26:56,504 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [939905227] [2020-08-19 00:26:56,509 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 00:26:56,510 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:26:56,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 00:26:56,522 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-19 00:26:56,524 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 4 states. [2020-08-19 00:26:56,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:26:56,703 INFO L93 Difference]: Finished difference Result 59 states and 76 transitions. [2020-08-19 00:26:56,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-19 00:26:56,705 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-19 00:26:56,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:26:56,716 INFO L225 Difference]: With dead ends: 59 [2020-08-19 00:26:56,716 INFO L226 Difference]: Without dead ends: 31 [2020-08-19 00:26:56,720 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 [2020-08-19 00:26:56,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-19 00:26:56,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-19 00:26:56,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-19 00:26:56,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-08-19 00:26:56,766 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 20 [2020-08-19 00:26:56,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:26:56,766 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-08-19 00:26:56,767 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 00:26:56,767 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-08-19 00:26:56,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-19 00:26:56,768 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:26:56,768 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] [2020-08-19 00:26:56,769 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 00:26:56,769 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:26:56,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:26:56,770 INFO L82 PathProgramCache]: Analyzing trace with hash -931069882, now seen corresponding path program 1 times [2020-08-19 00:26:56,770 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:26:56,771 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1437670496] [2020-08-19 00:26:56,771 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:26:56,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:26:56,850 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:26:56,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:26:56,870 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:26:56,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:26:56,939 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:26:56,940 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1437670496] [2020-08-19 00:26:56,940 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 00:26:56,940 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-19 00:26:56,941 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [96447986] [2020-08-19 00:26:56,942 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 00:26:56,942 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:26:56,943 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 00:26:56,943 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-19 00:26:56,943 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2020-08-19 00:26:57,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:26:57,124 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-08-19 00:26:57,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-19 00:26:57,125 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-08-19 00:26:57,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:26:57,126 INFO L225 Difference]: With dead ends: 48 [2020-08-19 00:26:57,126 INFO L226 Difference]: Without dead ends: 30 [2020-08-19 00:26:57,128 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 [2020-08-19 00:26:57,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-19 00:26:57,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-19 00:26:57,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-19 00:26:57,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-08-19 00:26:57,136 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-08-19 00:26:57,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:26:57,137 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-08-19 00:26:57,137 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 00:26:57,137 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-08-19 00:26:57,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-19 00:26:57,138 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:26:57,138 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] [2020-08-19 00:26:57,139 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 00:26:57,139 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:26:57,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:26:57,139 INFO L82 PathProgramCache]: Analyzing trace with hash 1782065480, now seen corresponding path program 1 times [2020-08-19 00:26:57,140 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:26:57,140 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1409081747] [2020-08-19 00:26:57,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:26:57,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:26:57,200 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:26:57,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:26:57,217 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:26:57,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:26:57,322 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:26:57,323 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1409081747] [2020-08-19 00:26:57,323 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:26:57,323 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-19 00:26:57,323 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1713190789] [2020-08-19 00:26:57,324 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 00:26:57,324 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:26:57,325 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 00:26:57,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-19 00:26:57,325 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 7 states. [2020-08-19 00:26:57,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:26:57,502 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-08-19 00:26:57,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 00:26:57,502 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2020-08-19 00:26:57,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:26:57,504 INFO L225 Difference]: With dead ends: 50 [2020-08-19 00:26:57,504 INFO L226 Difference]: Without dead ends: 32 [2020-08-19 00:26:57,504 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 [2020-08-19 00:26:57,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-19 00:26:57,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-19 00:26:57,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-19 00:26:57,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-08-19 00:26:57,512 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 22 [2020-08-19 00:26:57,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:26:57,512 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-08-19 00:26:57,513 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 00:26:57,513 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-08-19 00:26:57,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-19 00:26:57,514 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:26:57,514 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] [2020-08-19 00:26:57,514 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 00:26:57,514 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:26:57,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:26:57,515 INFO L82 PathProgramCache]: Analyzing trace with hash 2059999690, now seen corresponding path program 2 times [2020-08-19 00:26:57,515 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:26:57,516 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1918329406] [2020-08-19 00:26:57,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:26:57,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:26:57,564 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:26:57,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:26:57,584 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:26:57,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:26:57,735 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:26:57,736 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1918329406] [2020-08-19 00:26:57,736 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:26:57,736 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-19 00:26:57,737 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [917052945] [2020-08-19 00:26:57,737 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-19 00:26:57,738 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:26:57,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-19 00:26:57,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-08-19 00:26:57,738 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2020-08-19 00:26:57,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:26:57,914 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-08-19 00:26:57,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-19 00:26:57,914 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-08-19 00:26:57,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:26:57,915 INFO L225 Difference]: With dead ends: 52 [2020-08-19 00:26:57,915 INFO L226 Difference]: Without dead ends: 34 [2020-08-19 00:26:57,916 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-19 00:26:57,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-19 00:26:57,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-19 00:26:57,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-19 00:26:57,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-08-19 00:26:57,923 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 24 [2020-08-19 00:26:57,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:26:57,923 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-08-19 00:26:57,923 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-19 00:26:57,924 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-08-19 00:26:57,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-19 00:26:57,925 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:26:57,925 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] [2020-08-19 00:26:57,925 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-19 00:26:57,925 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:26:57,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:26:57,926 INFO L82 PathProgramCache]: Analyzing trace with hash -1428164148, now seen corresponding path program 3 times [2020-08-19 00:26:57,926 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:26:57,926 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [579732405] [2020-08-19 00:26:57,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:26:57,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:26:57,973 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:26:57,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:26:57,988 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:26:57,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:26:58,177 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:26:58,178 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [579732405] [2020-08-19 00:26:58,178 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:26:58,179 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-19 00:26:58,179 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1997465854] [2020-08-19 00:26:58,179 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-19 00:26:58,180 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:26:58,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-19 00:26:58,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-19 00:26:58,181 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 9 states. [2020-08-19 00:26:58,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:26:58,376 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-08-19 00:26:58,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-19 00:26:58,377 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-08-19 00:26:58,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:26:58,378 INFO L225 Difference]: With dead ends: 54 [2020-08-19 00:26:58,378 INFO L226 Difference]: Without dead ends: 36 [2020-08-19 00:26:58,379 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 [2020-08-19 00:26:58,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-19 00:26:58,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-19 00:26:58,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-19 00:26:58,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-08-19 00:26:58,385 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 26 [2020-08-19 00:26:58,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:26:58,386 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-08-19 00:26:58,386 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-19 00:26:58,386 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-08-19 00:26:58,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-19 00:26:58,387 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:26:58,387 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] [2020-08-19 00:26:58,388 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-19 00:26:58,388 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:26:58,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:26:58,388 INFO L82 PathProgramCache]: Analyzing trace with hash 815845710, now seen corresponding path program 4 times [2020-08-19 00:26:58,389 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:26:58,389 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [90506907] [2020-08-19 00:26:58,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:26:58,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:26:58,431 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:26:58,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:26:58,448 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:26:58,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:26:58,731 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:26:58,732 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [90506907] [2020-08-19 00:26:58,732 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:26:58,732 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-19 00:26:58,732 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1114834875] [2020-08-19 00:26:58,733 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-19 00:26:58,733 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:26:58,734 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-19 00:26:58,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-08-19 00:26:58,734 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 10 states. [2020-08-19 00:26:58,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:26:58,895 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2020-08-19 00:26:58,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-19 00:26:58,896 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-08-19 00:26:58,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:26:58,897 INFO L225 Difference]: With dead ends: 56 [2020-08-19 00:26:58,897 INFO L226 Difference]: Without dead ends: 38 [2020-08-19 00:26:58,898 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 [2020-08-19 00:26:58,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-19 00:26:58,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-19 00:26:58,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-19 00:26:58,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-08-19 00:26:58,904 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 28 [2020-08-19 00:26:58,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:26:58,905 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-08-19 00:26:58,905 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-19 00:26:58,905 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-08-19 00:26:58,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-19 00:26:58,906 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:26:58,906 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] [2020-08-19 00:26:58,906 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-19 00:26:58,906 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:26:58,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:26:58,907 INFO L82 PathProgramCache]: Analyzing trace with hash 1235736656, now seen corresponding path program 5 times [2020-08-19 00:26:58,907 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:26:58,907 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [338327102] [2020-08-19 00:26:58,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:26:58,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:26:58,949 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:26:58,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:26:58,961 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:26:58,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:26:59,208 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:26:59,208 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [338327102] [2020-08-19 00:26:59,209 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:26:59,209 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-19 00:26:59,210 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [769927379] [2020-08-19 00:26:59,210 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-19 00:26:59,210 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:26:59,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-19 00:26:59,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-19 00:26:59,211 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 11 states. [2020-08-19 00:26:59,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:26:59,447 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2020-08-19 00:26:59,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-19 00:26:59,447 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-19 00:26:59,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:26:59,449 INFO L225 Difference]: With dead ends: 58 [2020-08-19 00:26:59,449 INFO L226 Difference]: Without dead ends: 40 [2020-08-19 00:26:59,450 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 [2020-08-19 00:26:59,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-19 00:26:59,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-19 00:26:59,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-19 00:26:59,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-19 00:26:59,462 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 30 [2020-08-19 00:26:59,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:26:59,466 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-19 00:26:59,466 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-19 00:26:59,467 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-19 00:26:59,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-19 00:26:59,468 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:26:59,468 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] [2020-08-19 00:26:59,469 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-19 00:26:59,469 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:26:59,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:26:59,471 INFO L82 PathProgramCache]: Analyzing trace with hash 1024009938, now seen corresponding path program 6 times [2020-08-19 00:26:59,471 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:26:59,473 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [680852875] [2020-08-19 00:26:59,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:26:59,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:26:59,545 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:26:59,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:26:59,559 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:26:59,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:26:59,836 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:26:59,838 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [680852875] [2020-08-19 00:26:59,838 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:26:59,838 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-19 00:26:59,839 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1111992574] [2020-08-19 00:26:59,839 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-19 00:26:59,839 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:26:59,840 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-19 00:26:59,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-08-19 00:26:59,840 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 12 states. [2020-08-19 00:27:00,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:00,041 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2020-08-19 00:27:00,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-19 00:27:00,041 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-08-19 00:27:00,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:00,042 INFO L225 Difference]: With dead ends: 60 [2020-08-19 00:27:00,042 INFO L226 Difference]: Without dead ends: 42 [2020-08-19 00:27:00,043 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 [2020-08-19 00:27:00,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-19 00:27:00,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-19 00:27:00,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-19 00:27:00,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-19 00:27:00,054 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 32 [2020-08-19 00:27:00,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:00,056 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-19 00:27:00,056 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-19 00:27:00,056 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-19 00:27:00,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-19 00:27:00,057 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:00,058 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] [2020-08-19 00:27:00,060 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-19 00:27:00,060 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:00,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:00,061 INFO L82 PathProgramCache]: Analyzing trace with hash -581903148, now seen corresponding path program 7 times [2020-08-19 00:27:00,061 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:00,061 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [342496524] [2020-08-19 00:27:00,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:00,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:00,099 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:00,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:00,114 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:27:00,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:00,424 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:27:00,425 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [342496524] [2020-08-19 00:27:00,425 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:00,425 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-19 00:27:00,425 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1288640271] [2020-08-19 00:27:00,426 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-19 00:27:00,426 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:00,426 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-19 00:27:00,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2020-08-19 00:27:00,427 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 13 states. [2020-08-19 00:27:00,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:00,613 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-08-19 00:27:00,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-19 00:27:00,614 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-08-19 00:27:00,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:00,615 INFO L225 Difference]: With dead ends: 62 [2020-08-19 00:27:00,616 INFO L226 Difference]: Without dead ends: 44 [2020-08-19 00:27:00,616 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 [2020-08-19 00:27:00,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-19 00:27:00,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-19 00:27:00,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-19 00:27:00,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2020-08-19 00:27:00,627 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 34 [2020-08-19 00:27:00,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:00,628 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2020-08-19 00:27:00,628 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-19 00:27:00,628 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2020-08-19 00:27:00,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-19 00:27:00,631 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:00,631 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] [2020-08-19 00:27:00,631 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-19 00:27:00,631 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:00,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:00,632 INFO L82 PathProgramCache]: Analyzing trace with hash -1971119530, now seen corresponding path program 8 times [2020-08-19 00:27:00,632 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:00,632 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [498914711] [2020-08-19 00:27:00,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:00,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:00,693 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:00,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:00,705 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:27:00,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:01,049 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:27:01,050 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [498914711] [2020-08-19 00:27:01,050 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:01,050 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-19 00:27:01,050 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1105612982] [2020-08-19 00:27:01,053 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-19 00:27:01,054 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:01,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-19 00:27:01,054 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-08-19 00:27:01,054 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand 14 states. [2020-08-19 00:27:01,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:01,301 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2020-08-19 00:27:01,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-19 00:27:01,302 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-19 00:27:01,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:01,303 INFO L225 Difference]: With dead ends: 64 [2020-08-19 00:27:01,303 INFO L226 Difference]: Without dead ends: 46 [2020-08-19 00:27:01,304 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 [2020-08-19 00:27:01,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-19 00:27:01,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-19 00:27:01,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-19 00:27:01,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2020-08-19 00:27:01,310 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 36 [2020-08-19 00:27:01,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:01,311 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2020-08-19 00:27:01,311 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-19 00:27:01,311 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2020-08-19 00:27:01,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-19 00:27:01,312 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:01,312 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] [2020-08-19 00:27:01,312 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-19 00:27:01,312 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:01,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:01,313 INFO L82 PathProgramCache]: Analyzing trace with hash -1273233576, now seen corresponding path program 9 times [2020-08-19 00:27:01,313 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:01,313 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1684831410] [2020-08-19 00:27:01,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:01,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:01,348 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:01,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:01,360 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:27:01,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:01,373 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-19 00:27:01,373 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1684831410] [2020-08-19 00:27:01,373 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 00:27:01,373 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-19 00:27:01,374 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1022202359] [2020-08-19 00:27:01,374 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 00:27:01,374 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:01,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 00:27:01,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-19 00:27:01,375 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 5 states. [2020-08-19 00:27:01,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:01,464 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2020-08-19 00:27:01,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-19 00:27:01,464 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2020-08-19 00:27:01,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:01,467 INFO L225 Difference]: With dead ends: 65 [2020-08-19 00:27:01,467 INFO L226 Difference]: Without dead ends: 53 [2020-08-19 00:27:01,468 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 [2020-08-19 00:27:01,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-19 00:27:01,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 46. [2020-08-19 00:27:01,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-19 00:27:01,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-08-19 00:27:01,491 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 38 [2020-08-19 00:27:01,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:01,491 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-08-19 00:27:01,491 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 00:27:01,492 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-08-19 00:27:01,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-19 00:27:01,494 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:01,495 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] [2020-08-19 00:27:01,497 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-19 00:27:01,497 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:01,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:01,498 INFO L82 PathProgramCache]: Analyzing trace with hash -1053921041, now seen corresponding path program 1 times [2020-08-19 00:27:01,498 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:01,498 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [524316908] [2020-08-19 00:27:01,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:01,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:01,575 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:01,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:01,586 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:27:01,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:01,606 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-19 00:27:01,607 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [524316908] [2020-08-19 00:27:01,607 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:01,607 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-19 00:27:01,607 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1482685037] [2020-08-19 00:27:01,608 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 00:27:01,608 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:01,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 00:27:01,608 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-19 00:27:01,609 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 6 states. [2020-08-19 00:27:01,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:01,704 INFO L93 Difference]: Finished difference Result 73 states and 85 transitions. [2020-08-19 00:27:01,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 00:27:01,705 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 41 [2020-08-19 00:27:01,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:01,706 INFO L225 Difference]: With dead ends: 73 [2020-08-19 00:27:01,706 INFO L226 Difference]: Without dead ends: 61 [2020-08-19 00:27:01,708 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 [2020-08-19 00:27:01,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-19 00:27:01,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 49. [2020-08-19 00:27:01,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-19 00:27:01,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2020-08-19 00:27:01,715 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 41 [2020-08-19 00:27:01,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:01,715 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2020-08-19 00:27:01,716 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 00:27:01,716 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2020-08-19 00:27:01,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-19 00:27:01,719 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:01,719 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] [2020-08-19 00:27:01,719 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-19 00:27:01,719 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:01,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:01,720 INFO L82 PathProgramCache]: Analyzing trace with hash -159448072, now seen corresponding path program 2 times [2020-08-19 00:27:01,720 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:01,720 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1377106585] [2020-08-19 00:27:01,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:01,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:01,771 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:01,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:01,783 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:27:01,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:01,794 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2020-08-19 00:27:01,794 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1377106585] [2020-08-19 00:27:01,795 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 00:27:01,795 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-19 00:27:01,795 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1869577542] [2020-08-19 00:27:01,796 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 00:27:01,796 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:01,796 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 00:27:01,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-19 00:27:01,797 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 5 states. [2020-08-19 00:27:01,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:01,873 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2020-08-19 00:27:01,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-19 00:27:01,874 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 44 [2020-08-19 00:27:01,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:01,875 INFO L225 Difference]: With dead ends: 69 [2020-08-19 00:27:01,875 INFO L226 Difference]: Without dead ends: 49 [2020-08-19 00:27:01,878 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 [2020-08-19 00:27:01,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-19 00:27:01,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-19 00:27:01,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-19 00:27:01,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2020-08-19 00:27:01,891 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 44 [2020-08-19 00:27:01,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:01,891 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2020-08-19 00:27:01,891 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 00:27:01,891 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2020-08-19 00:27:01,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-19 00:27:01,892 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:01,892 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] [2020-08-19 00:27:01,893 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-19 00:27:01,895 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:01,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:01,895 INFO L82 PathProgramCache]: Analyzing trace with hash -1139281096, now seen corresponding path program 1 times [2020-08-19 00:27:01,895 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:01,896 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [8186951] [2020-08-19 00:27:01,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:01,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:01,966 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:01,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:01,980 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:27:01,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:02,438 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 00:27:02,439 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [8186951] [2020-08-19 00:27:02,439 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:02,440 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-19 00:27:02,440 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1454280207] [2020-08-19 00:27:02,441 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-19 00:27:02,441 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:02,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-19 00:27:02,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2020-08-19 00:27:02,442 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand 15 states. [2020-08-19 00:27:02,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:02,658 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2020-08-19 00:27:02,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-19 00:27:02,659 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2020-08-19 00:27:02,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:02,660 INFO L225 Difference]: With dead ends: 74 [2020-08-19 00:27:02,660 INFO L226 Difference]: Without dead ends: 52 [2020-08-19 00:27:02,661 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 [2020-08-19 00:27:02,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-19 00:27:02,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-19 00:27:02,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-19 00:27:02,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2020-08-19 00:27:02,667 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 44 [2020-08-19 00:27:02,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:02,667 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2020-08-19 00:27:02,668 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-19 00:27:02,668 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2020-08-19 00:27:02,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-19 00:27:02,668 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:02,669 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] [2020-08-19 00:27:02,669 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-19 00:27:02,669 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:02,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:02,669 INFO L82 PathProgramCache]: Analyzing trace with hash 763672122, now seen corresponding path program 2 times [2020-08-19 00:27:02,670 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:02,670 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1924278354] [2020-08-19 00:27:02,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:02,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:02,710 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:02,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:02,726 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:27:02,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:03,206 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 00:27:03,207 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1924278354] [2020-08-19 00:27:03,207 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:03,207 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-19 00:27:03,207 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2090653381] [2020-08-19 00:27:03,208 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-19 00:27:03,208 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:03,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-19 00:27:03,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2020-08-19 00:27:03,209 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand 16 states. [2020-08-19 00:27:03,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:03,415 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2020-08-19 00:27:03,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-19 00:27:03,416 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 46 [2020-08-19 00:27:03,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:03,417 INFO L225 Difference]: With dead ends: 76 [2020-08-19 00:27:03,417 INFO L226 Difference]: Without dead ends: 54 [2020-08-19 00:27:03,418 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=118, Invalid=224, Unknown=0, NotChecked=0, Total=342 [2020-08-19 00:27:03,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-19 00:27:03,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-19 00:27:03,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-19 00:27:03,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2020-08-19 00:27:03,427 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 46 [2020-08-19 00:27:03,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:03,428 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2020-08-19 00:27:03,428 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-19 00:27:03,428 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2020-08-19 00:27:03,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-19 00:27:03,429 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:03,430 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] [2020-08-19 00:27:03,430 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-19 00:27:03,430 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:03,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:03,431 INFO L82 PathProgramCache]: Analyzing trace with hash -154353476, now seen corresponding path program 3 times [2020-08-19 00:27:03,431 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:03,431 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1334646948] [2020-08-19 00:27:03,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:03,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:03,468 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:03,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:03,479 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:27:03,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:04,055 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 00:27:04,055 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1334646948] [2020-08-19 00:27:04,059 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:04,059 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-19 00:27:04,059 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [531952793] [2020-08-19 00:27:04,060 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-19 00:27:04,060 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:04,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-19 00:27:04,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=175, Unknown=0, NotChecked=0, Total=272 [2020-08-19 00:27:04,061 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 17 states. [2020-08-19 00:27:04,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:04,316 INFO L93 Difference]: Finished difference Result 78 states and 84 transitions. [2020-08-19 00:27:04,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-19 00:27:04,317 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-19 00:27:04,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:04,318 INFO L225 Difference]: With dead ends: 78 [2020-08-19 00:27:04,318 INFO L226 Difference]: Without dead ends: 56 [2020-08-19 00:27:04,320 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=133, Invalid=247, Unknown=0, NotChecked=0, Total=380 [2020-08-19 00:27:04,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-19 00:27:04,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-19 00:27:04,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-19 00:27:04,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2020-08-19 00:27:04,335 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 48 [2020-08-19 00:27:04,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:04,336 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2020-08-19 00:27:04,336 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-19 00:27:04,336 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2020-08-19 00:27:04,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-19 00:27:04,337 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:04,338 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] [2020-08-19 00:27:04,338 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-19 00:27:04,338 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:04,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:04,339 INFO L82 PathProgramCache]: Analyzing trace with hash -1908657474, now seen corresponding path program 4 times [2020-08-19 00:27:04,339 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:04,339 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [7878601] [2020-08-19 00:27:04,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:04,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:04,406 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:04,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:04,424 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:27:04,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:04,962 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 00:27:04,962 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [7878601] [2020-08-19 00:27:04,963 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:04,963 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-19 00:27:04,963 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1870357307] [2020-08-19 00:27:04,963 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-19 00:27:04,964 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:04,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-19 00:27:04,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=195, Unknown=0, NotChecked=0, Total=306 [2020-08-19 00:27:04,964 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand 18 states. [2020-08-19 00:27:05,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:05,202 INFO L93 Difference]: Finished difference Result 80 states and 86 transitions. [2020-08-19 00:27:05,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-19 00:27:05,203 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2020-08-19 00:27:05,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:05,204 INFO L225 Difference]: With dead ends: 80 [2020-08-19 00:27:05,204 INFO L226 Difference]: Without dead ends: 58 [2020-08-19 00:27:05,205 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 [2020-08-19 00:27:05,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-19 00:27:05,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-19 00:27:05,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-19 00:27:05,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2020-08-19 00:27:05,211 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 50 [2020-08-19 00:27:05,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:05,212 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2020-08-19 00:27:05,212 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-19 00:27:05,212 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2020-08-19 00:27:05,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-19 00:27:05,212 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:05,213 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] [2020-08-19 00:27:05,213 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-19 00:27:05,213 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:05,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:05,213 INFO L82 PathProgramCache]: Analyzing trace with hash 127347776, now seen corresponding path program 5 times [2020-08-19 00:27:05,213 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:05,214 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [188808475] [2020-08-19 00:27:05,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:05,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:05,244 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:05,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:05,262 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:27:05,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:05,788 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 00:27:05,788 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [188808475] [2020-08-19 00:27:05,788 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:05,789 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-19 00:27:05,789 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612836008] [2020-08-19 00:27:05,789 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-19 00:27:05,790 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:05,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-19 00:27:05,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=216, Unknown=0, NotChecked=0, Total=342 [2020-08-19 00:27:05,790 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand 19 states. [2020-08-19 00:27:06,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:06,074 INFO L93 Difference]: Finished difference Result 82 states and 88 transitions. [2020-08-19 00:27:06,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-19 00:27:06,075 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 52 [2020-08-19 00:27:06,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:06,076 INFO L225 Difference]: With dead ends: 82 [2020-08-19 00:27:06,076 INFO L226 Difference]: Without dead ends: 60 [2020-08-19 00:27:06,077 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 [2020-08-19 00:27:06,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-19 00:27:06,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-19 00:27:06,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-19 00:27:06,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2020-08-19 00:27:06,082 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 52 [2020-08-19 00:27:06,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:06,082 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2020-08-19 00:27:06,082 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-19 00:27:06,082 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2020-08-19 00:27:06,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-19 00:27:06,083 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:06,083 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] [2020-08-19 00:27:06,083 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-19 00:27:06,084 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:06,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:06,084 INFO L82 PathProgramCache]: Analyzing trace with hash -1776693950, now seen corresponding path program 6 times [2020-08-19 00:27:06,085 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:06,086 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1120462328] [2020-08-19 00:27:06,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:06,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:06,150 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:06,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:06,160 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:27:06,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:06,775 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 00:27:06,776 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1120462328] [2020-08-19 00:27:06,776 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:06,776 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-19 00:27:06,776 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [246199589] [2020-08-19 00:27:06,777 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-19 00:27:06,777 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:06,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-19 00:27:06,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=238, Unknown=0, NotChecked=0, Total=380 [2020-08-19 00:27:06,778 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand 20 states. [2020-08-19 00:27:07,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:07,073 INFO L93 Difference]: Finished difference Result 84 states and 90 transitions. [2020-08-19 00:27:07,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-19 00:27:07,078 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 54 [2020-08-19 00:27:07,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:07,079 INFO L225 Difference]: With dead ends: 84 [2020-08-19 00:27:07,079 INFO L226 Difference]: Without dead ends: 62 [2020-08-19 00:27:07,080 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 [2020-08-19 00:27:07,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-19 00:27:07,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-19 00:27:07,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-19 00:27:07,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2020-08-19 00:27:07,088 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 54 [2020-08-19 00:27:07,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:07,089 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2020-08-19 00:27:07,089 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-19 00:27:07,089 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2020-08-19 00:27:07,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-19 00:27:07,089 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:07,092 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] [2020-08-19 00:27:07,092 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-19 00:27:07,093 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:07,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:07,093 INFO L82 PathProgramCache]: Analyzing trace with hash -1904724540, now seen corresponding path program 7 times [2020-08-19 00:27:07,093 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:07,094 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2143445383] [2020-08-19 00:27:07,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:07,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:07,161 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:07,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:07,172 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:27:07,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:08,016 INFO L134 CoverageAnalysis]: Checked inductivity of 230 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 00:27:08,017 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2143445383] [2020-08-19 00:27:08,017 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:08,017 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-19 00:27:08,018 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1989115163] [2020-08-19 00:27:08,020 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-19 00:27:08,021 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:08,021 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-19 00:27:08,021 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=261, Unknown=0, NotChecked=0, Total=420 [2020-08-19 00:27:08,022 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand 21 states. [2020-08-19 00:27:08,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:08,284 INFO L93 Difference]: Finished difference Result 86 states and 92 transitions. [2020-08-19 00:27:08,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-19 00:27:08,285 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 56 [2020-08-19 00:27:08,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:08,285 INFO L225 Difference]: With dead ends: 86 [2020-08-19 00:27:08,286 INFO L226 Difference]: Without dead ends: 64 [2020-08-19 00:27:08,286 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=203, Invalid=349, Unknown=0, NotChecked=0, Total=552 [2020-08-19 00:27:08,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-19 00:27:08,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-19 00:27:08,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-19 00:27:08,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2020-08-19 00:27:08,296 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 56 [2020-08-19 00:27:08,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:08,297 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2020-08-19 00:27:08,297 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-19 00:27:08,297 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2020-08-19 00:27:08,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-19 00:27:08,301 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:08,301 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] [2020-08-19 00:27:08,301 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-19 00:27:08,302 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:08,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:08,302 INFO L82 PathProgramCache]: Analyzing trace with hash -388069946, now seen corresponding path program 8 times [2020-08-19 00:27:08,302 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:08,302 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1843689297] [2020-08-19 00:27:08,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:08,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:08,348 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:08,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:08,360 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:27:08,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:09,226 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 00:27:09,226 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1843689297] [2020-08-19 00:27:09,226 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:09,227 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-19 00:27:09,227 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [654246543] [2020-08-19 00:27:09,227 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-19 00:27:09,228 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:09,228 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-19 00:27:09,228 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=285, Unknown=0, NotChecked=0, Total=462 [2020-08-19 00:27:09,229 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand 22 states. [2020-08-19 00:27:09,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:09,539 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2020-08-19 00:27:09,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-19 00:27:09,539 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 58 [2020-08-19 00:27:09,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:09,540 INFO L225 Difference]: With dead ends: 88 [2020-08-19 00:27:09,540 INFO L226 Difference]: Without dead ends: 66 [2020-08-19 00:27:09,541 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=223, Invalid=377, Unknown=0, NotChecked=0, Total=600 [2020-08-19 00:27:09,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-19 00:27:09,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-19 00:27:09,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-19 00:27:09,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 68 transitions. [2020-08-19 00:27:09,545 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 68 transitions. Word has length 58 [2020-08-19 00:27:09,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:09,545 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 68 transitions. [2020-08-19 00:27:09,545 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-19 00:27:09,546 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 68 transitions. [2020-08-19 00:27:09,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-19 00:27:09,546 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:09,546 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] [2020-08-19 00:27:09,547 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-19 00:27:09,547 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:09,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:09,547 INFO L82 PathProgramCache]: Analyzing trace with hash 1123081544, now seen corresponding path program 9 times [2020-08-19 00:27:09,547 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:09,548 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1568700890] [2020-08-19 00:27:09,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:09,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:09,586 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:09,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:09,597 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:27:09,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:10,397 INFO L134 CoverageAnalysis]: Checked inductivity of 294 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 00:27:10,398 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1568700890] [2020-08-19 00:27:10,398 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:10,398 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-19 00:27:10,398 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1918222150] [2020-08-19 00:27:10,398 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-19 00:27:10,399 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:10,399 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-19 00:27:10,399 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=310, Unknown=0, NotChecked=0, Total=506 [2020-08-19 00:27:10,399 INFO L87 Difference]: Start difference. First operand 65 states and 68 transitions. Second operand 23 states. [2020-08-19 00:27:10,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:10,698 INFO L93 Difference]: Finished difference Result 90 states and 96 transitions. [2020-08-19 00:27:10,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-19 00:27:10,701 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 60 [2020-08-19 00:27:10,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:10,701 INFO L225 Difference]: With dead ends: 90 [2020-08-19 00:27:10,701 INFO L226 Difference]: Without dead ends: 68 [2020-08-19 00:27:10,702 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=244, Invalid=406, Unknown=0, NotChecked=0, Total=650 [2020-08-19 00:27:10,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-19 00:27:10,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-19 00:27:10,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-19 00:27:10,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2020-08-19 00:27:10,705 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 60 [2020-08-19 00:27:10,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:10,706 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2020-08-19 00:27:10,706 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-19 00:27:10,706 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2020-08-19 00:27:10,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-19 00:27:10,706 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:10,707 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] [2020-08-19 00:27:10,707 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-19 00:27:10,707 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:10,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:10,707 INFO L82 PathProgramCache]: Analyzing trace with hash 1640717386, now seen corresponding path program 10 times [2020-08-19 00:27:10,708 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:10,708 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [872915658] [2020-08-19 00:27:10,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:10,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:10,748 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:10,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:10,768 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:27:10,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:11,590 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 00:27:11,591 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [872915658] [2020-08-19 00:27:11,591 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:11,591 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-19 00:27:11,591 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1568673363] [2020-08-19 00:27:11,592 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-19 00:27:11,592 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:11,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-19 00:27:11,592 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=336, Unknown=0, NotChecked=0, Total=552 [2020-08-19 00:27:11,593 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 24 states. [2020-08-19 00:27:11,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:11,870 INFO L93 Difference]: Finished difference Result 92 states and 98 transitions. [2020-08-19 00:27:11,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-19 00:27:11,871 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 62 [2020-08-19 00:27:11,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:11,872 INFO L225 Difference]: With dead ends: 92 [2020-08-19 00:27:11,872 INFO L226 Difference]: Without dead ends: 70 [2020-08-19 00:27:11,874 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 [2020-08-19 00:27:11,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-19 00:27:11,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-19 00:27:11,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-19 00:27:11,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2020-08-19 00:27:11,879 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 62 [2020-08-19 00:27:11,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:11,879 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2020-08-19 00:27:11,879 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-19 00:27:11,880 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2020-08-19 00:27:11,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-19 00:27:11,880 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:11,880 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] [2020-08-19 00:27:11,880 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-19 00:27:11,880 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:11,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:11,881 INFO L82 PathProgramCache]: Analyzing trace with hash 872555212, now seen corresponding path program 11 times [2020-08-19 00:27:11,881 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:11,881 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1275635292] [2020-08-19 00:27:11,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:11,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:11,922 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:11,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:11,933 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:27:11,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:12,905 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 00:27:12,905 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1275635292] [2020-08-19 00:27:12,906 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:12,906 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-19 00:27:12,906 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1849273719] [2020-08-19 00:27:12,907 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-19 00:27:12,907 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:12,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-19 00:27:12,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=363, Unknown=0, NotChecked=0, Total=600 [2020-08-19 00:27:12,908 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand 25 states. [2020-08-19 00:27:13,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:13,233 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2020-08-19 00:27:13,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-19 00:27:13,234 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 64 [2020-08-19 00:27:13,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:13,235 INFO L225 Difference]: With dead ends: 94 [2020-08-19 00:27:13,235 INFO L226 Difference]: Without dead ends: 72 [2020-08-19 00:27:13,236 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 [2020-08-19 00:27:13,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-19 00:27:13,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-19 00:27:13,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-19 00:27:13,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 74 transitions. [2020-08-19 00:27:13,241 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 74 transitions. Word has length 64 [2020-08-19 00:27:13,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:13,242 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 74 transitions. [2020-08-19 00:27:13,242 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-19 00:27:13,242 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 74 transitions. [2020-08-19 00:27:13,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-19 00:27:13,242 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:13,243 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] [2020-08-19 00:27:13,243 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-19 00:27:13,243 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:13,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:13,243 INFO L82 PathProgramCache]: Analyzing trace with hash 1403080910, now seen corresponding path program 12 times [2020-08-19 00:27:13,244 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:13,244 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2042334517] [2020-08-19 00:27:13,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:13,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:13,289 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:13,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:13,300 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:27:13,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:14,325 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 00:27:14,326 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2042334517] [2020-08-19 00:27:14,326 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:14,326 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-19 00:27:14,326 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1881461620] [2020-08-19 00:27:14,326 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-19 00:27:14,327 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:14,327 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-19 00:27:14,327 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2020-08-19 00:27:14,327 INFO L87 Difference]: Start difference. First operand 71 states and 74 transitions. Second operand 26 states. [2020-08-19 00:27:14,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:14,693 INFO L93 Difference]: Finished difference Result 96 states and 102 transitions. [2020-08-19 00:27:14,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-19 00:27:14,694 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 66 [2020-08-19 00:27:14,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:14,694 INFO L225 Difference]: With dead ends: 96 [2020-08-19 00:27:14,695 INFO L226 Difference]: Without dead ends: 74 [2020-08-19 00:27:14,695 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=313, Invalid=499, Unknown=0, NotChecked=0, Total=812 [2020-08-19 00:27:14,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-19 00:27:14,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-19 00:27:14,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-19 00:27:14,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 76 transitions. [2020-08-19 00:27:14,699 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 76 transitions. Word has length 66 [2020-08-19 00:27:14,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:14,700 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 76 transitions. [2020-08-19 00:27:14,700 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-19 00:27:14,700 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 76 transitions. [2020-08-19 00:27:14,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-19 00:27:14,701 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:14,701 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] [2020-08-19 00:27:14,701 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-19 00:27:14,701 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:14,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:14,701 INFO L82 PathProgramCache]: Analyzing trace with hash 137168464, now seen corresponding path program 13 times [2020-08-19 00:27:14,702 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:14,702 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [14989631] [2020-08-19 00:27:14,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:14,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:14,765 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:14,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:14,777 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:27:14,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:15,849 INFO L134 CoverageAnalysis]: Checked inductivity of 446 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 00:27:15,849 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [14989631] [2020-08-19 00:27:15,849 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:15,849 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-19 00:27:15,849 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1843258575] [2020-08-19 00:27:15,850 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-19 00:27:15,850 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:15,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-19 00:27:15,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=420, Unknown=0, NotChecked=0, Total=702 [2020-08-19 00:27:15,851 INFO L87 Difference]: Start difference. First operand 73 states and 76 transitions. Second operand 27 states. [2020-08-19 00:27:16,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:16,085 INFO L93 Difference]: Finished difference Result 98 states and 104 transitions. [2020-08-19 00:27:16,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-19 00:27:16,086 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 68 [2020-08-19 00:27:16,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:16,087 INFO L225 Difference]: With dead ends: 98 [2020-08-19 00:27:16,087 INFO L226 Difference]: Without dead ends: 76 [2020-08-19 00:27:16,088 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 [2020-08-19 00:27:16,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-19 00:27:16,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-19 00:27:16,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-19 00:27:16,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2020-08-19 00:27:16,093 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 68 [2020-08-19 00:27:16,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:16,093 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2020-08-19 00:27:16,093 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-19 00:27:16,093 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2020-08-19 00:27:16,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-19 00:27:16,094 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:16,094 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] [2020-08-19 00:27:16,094 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-19 00:27:16,094 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:16,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:16,095 INFO L82 PathProgramCache]: Analyzing trace with hash -928947374, now seen corresponding path program 14 times [2020-08-19 00:27:16,095 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:16,095 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1422786189] [2020-08-19 00:27:16,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:16,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:16,143 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:16,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:16,153 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:27:16,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:17,226 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 00:27:17,226 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1422786189] [2020-08-19 00:27:17,227 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:17,227 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-19 00:27:17,227 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [682498298] [2020-08-19 00:27:17,227 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-19 00:27:17,227 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:17,228 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-19 00:27:17,228 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=450, Unknown=0, NotChecked=0, Total=756 [2020-08-19 00:27:17,228 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand 28 states. [2020-08-19 00:27:17,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:17,558 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2020-08-19 00:27:17,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-19 00:27:17,558 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 70 [2020-08-19 00:27:17,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:17,560 INFO L225 Difference]: With dead ends: 100 [2020-08-19 00:27:17,560 INFO L226 Difference]: Without dead ends: 78 [2020-08-19 00:27:17,561 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 [2020-08-19 00:27:17,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-19 00:27:17,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-19 00:27:17,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-19 00:27:17,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 80 transitions. [2020-08-19 00:27:17,565 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 80 transitions. Word has length 70 [2020-08-19 00:27:17,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:17,566 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 80 transitions. [2020-08-19 00:27:17,566 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-19 00:27:17,566 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 80 transitions. [2020-08-19 00:27:17,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-19 00:27:17,567 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:17,567 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] [2020-08-19 00:27:17,567 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-19 00:27:17,567 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:17,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:17,567 INFO L82 PathProgramCache]: Analyzing trace with hash 1030916052, now seen corresponding path program 15 times [2020-08-19 00:27:17,568 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:17,568 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1592812642] [2020-08-19 00:27:17,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:17,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:17,614 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:17,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:17,624 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:27:17,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:18,802 INFO L134 CoverageAnalysis]: Checked inductivity of 534 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 00:27:18,803 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1592812642] [2020-08-19 00:27:18,803 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:18,803 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-19 00:27:18,803 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [163711660] [2020-08-19 00:27:18,804 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-19 00:27:18,804 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:18,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-19 00:27:18,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=481, Unknown=0, NotChecked=0, Total=812 [2020-08-19 00:27:18,805 INFO L87 Difference]: Start difference. First operand 77 states and 80 transitions. Second operand 29 states. [2020-08-19 00:27:19,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:19,213 INFO L93 Difference]: Finished difference Result 102 states and 108 transitions. [2020-08-19 00:27:19,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-19 00:27:19,213 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 72 [2020-08-19 00:27:19,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:19,215 INFO L225 Difference]: With dead ends: 102 [2020-08-19 00:27:19,215 INFO L226 Difference]: Without dead ends: 80 [2020-08-19 00:27:19,216 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=391, Invalid=601, Unknown=0, NotChecked=0, Total=992 [2020-08-19 00:27:19,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-19 00:27:19,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-19 00:27:19,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-19 00:27:19,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 82 transitions. [2020-08-19 00:27:19,220 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 82 transitions. Word has length 72 [2020-08-19 00:27:19,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:19,221 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 82 transitions. [2020-08-19 00:27:19,221 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-19 00:27:19,221 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 82 transitions. [2020-08-19 00:27:19,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-19 00:27:19,222 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:19,222 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] [2020-08-19 00:27:19,222 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-19 00:27:19,222 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:19,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:19,222 INFO L82 PathProgramCache]: Analyzing trace with hash -1030974506, now seen corresponding path program 16 times [2020-08-19 00:27:19,223 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:19,223 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1997717354] [2020-08-19 00:27:19,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:19,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:19,296 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:19,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:19,309 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:27:19,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:20,557 INFO L134 CoverageAnalysis]: Checked inductivity of 581 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 00:27:20,557 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1997717354] [2020-08-19 00:27:20,558 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:20,558 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-19 00:27:20,558 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2059338902] [2020-08-19 00:27:20,558 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-19 00:27:20,558 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:20,559 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-19 00:27:20,559 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2020-08-19 00:27:20,559 INFO L87 Difference]: Start difference. First operand 79 states and 82 transitions. Second operand 30 states. [2020-08-19 00:27:20,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:20,879 INFO L93 Difference]: Finished difference Result 104 states and 110 transitions. [2020-08-19 00:27:20,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-19 00:27:20,879 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 74 [2020-08-19 00:27:20,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:20,881 INFO L225 Difference]: With dead ends: 104 [2020-08-19 00:27:20,881 INFO L226 Difference]: Without dead ends: 82 [2020-08-19 00:27:20,882 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 [2020-08-19 00:27:20,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-19 00:27:20,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-19 00:27:20,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-19 00:27:20,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2020-08-19 00:27:20,886 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 74 [2020-08-19 00:27:20,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:20,887 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2020-08-19 00:27:20,887 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-19 00:27:20,887 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2020-08-19 00:27:20,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-19 00:27:20,887 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:20,887 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] [2020-08-19 00:27:20,888 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-19 00:27:20,888 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:20,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:20,888 INFO L82 PathProgramCache]: Analyzing trace with hash 1767090008, now seen corresponding path program 17 times [2020-08-19 00:27:20,888 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:20,888 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [709079764] [2020-08-19 00:27:20,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:20,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:20,940 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:20,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:20,950 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:27:20,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:22,282 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 00:27:22,282 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [709079764] [2020-08-19 00:27:22,282 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:22,282 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-19 00:27:22,282 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1945786312] [2020-08-19 00:27:22,283 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-19 00:27:22,283 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:22,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-19 00:27:22,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=546, Unknown=0, NotChecked=0, Total=930 [2020-08-19 00:27:22,284 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand 31 states. [2020-08-19 00:27:22,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:22,676 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2020-08-19 00:27:22,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-19 00:27:22,676 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 76 [2020-08-19 00:27:22,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:22,677 INFO L225 Difference]: With dead ends: 106 [2020-08-19 00:27:22,678 INFO L226 Difference]: Without dead ends: 84 [2020-08-19 00:27:22,679 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 [2020-08-19 00:27:22,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-19 00:27:22,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-19 00:27:22,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-19 00:27:22,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2020-08-19 00:27:22,683 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 76 [2020-08-19 00:27:22,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:22,683 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2020-08-19 00:27:22,683 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-19 00:27:22,683 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2020-08-19 00:27:22,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-19 00:27:22,683 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:22,683 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] [2020-08-19 00:27:22,684 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-19 00:27:22,684 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:22,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:22,684 INFO L82 PathProgramCache]: Analyzing trace with hash 2057560666, now seen corresponding path program 18 times [2020-08-19 00:27:22,684 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:22,684 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [174536314] [2020-08-19 00:27:22,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:22,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:22,736 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:22,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:22,748 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:27:22,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:24,167 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 00:27:24,167 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [174536314] [2020-08-19 00:27:24,168 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:24,168 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-19 00:27:24,168 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [282197088] [2020-08-19 00:27:24,168 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-19 00:27:24,168 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:24,169 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-19 00:27:24,169 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=580, Unknown=0, NotChecked=0, Total=992 [2020-08-19 00:27:24,169 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand 32 states. [2020-08-19 00:27:24,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:24,639 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2020-08-19 00:27:24,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-19 00:27:24,640 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 78 [2020-08-19 00:27:24,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:24,641 INFO L225 Difference]: With dead ends: 108 [2020-08-19 00:27:24,641 INFO L226 Difference]: Without dead ends: 86 [2020-08-19 00:27:24,642 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 [2020-08-19 00:27:24,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-19 00:27:24,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-19 00:27:24,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-19 00:27:24,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 88 transitions. [2020-08-19 00:27:24,647 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 88 transitions. Word has length 78 [2020-08-19 00:27:24,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:24,647 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 88 transitions. [2020-08-19 00:27:24,647 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-19 00:27:24,647 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 88 transitions. [2020-08-19 00:27:24,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-19 00:27:24,648 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:24,648 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] [2020-08-19 00:27:24,649 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-19 00:27:24,650 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:24,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:24,650 INFO L82 PathProgramCache]: Analyzing trace with hash 2026988764, now seen corresponding path program 19 times [2020-08-19 00:27:24,650 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:24,650 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1746166048] [2020-08-19 00:27:24,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:24,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:24,713 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:24,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:24,724 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:27:24,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:26,218 INFO L134 CoverageAnalysis]: Checked inductivity of 734 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 00:27:26,218 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1746166048] [2020-08-19 00:27:26,218 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:26,218 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-19 00:27:26,218 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [800308047] [2020-08-19 00:27:26,219 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-19 00:27:26,219 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:26,219 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-19 00:27:26,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=615, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 00:27:26,220 INFO L87 Difference]: Start difference. First operand 85 states and 88 transitions. Second operand 33 states. [2020-08-19 00:27:26,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:26,670 INFO L93 Difference]: Finished difference Result 110 states and 116 transitions. [2020-08-19 00:27:26,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-19 00:27:26,670 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 80 [2020-08-19 00:27:26,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:26,671 INFO L225 Difference]: With dead ends: 110 [2020-08-19 00:27:26,672 INFO L226 Difference]: Without dead ends: 88 [2020-08-19 00:27:26,673 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=509, Invalid=751, Unknown=0, NotChecked=0, Total=1260 [2020-08-19 00:27:26,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-19 00:27:26,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-19 00:27:26,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-19 00:27:26,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2020-08-19 00:27:26,678 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 80 [2020-08-19 00:27:26,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:26,678 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2020-08-19 00:27:26,678 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-19 00:27:26,678 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2020-08-19 00:27:26,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-19 00:27:26,679 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:26,679 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] [2020-08-19 00:27:26,679 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-19 00:27:26,679 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:26,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:26,680 INFO L82 PathProgramCache]: Analyzing trace with hash -1582805282, now seen corresponding path program 20 times [2020-08-19 00:27:26,680 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:26,680 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1919819195] [2020-08-19 00:27:26,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:26,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:26,739 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:26,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:26,748 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:27:26,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:28,265 INFO L134 CoverageAnalysis]: Checked inductivity of 789 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 00:27:28,265 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1919819195] [2020-08-19 00:27:28,266 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:28,266 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-19 00:27:28,266 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1675899162] [2020-08-19 00:27:28,266 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-19 00:27:28,266 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:28,266 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-19 00:27:28,267 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=651, Unknown=0, NotChecked=0, Total=1122 [2020-08-19 00:27:28,267 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand 34 states. [2020-08-19 00:27:28,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:28,740 INFO L93 Difference]: Finished difference Result 112 states and 118 transitions. [2020-08-19 00:27:28,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-19 00:27:28,740 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 82 [2020-08-19 00:27:28,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:28,741 INFO L225 Difference]: With dead ends: 112 [2020-08-19 00:27:28,742 INFO L226 Difference]: Without dead ends: 90 [2020-08-19 00:27:28,743 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=541, Invalid=791, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 00:27:28,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-19 00:27:28,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-19 00:27:28,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-19 00:27:28,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 92 transitions. [2020-08-19 00:27:28,747 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 92 transitions. Word has length 82 [2020-08-19 00:27:28,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:28,748 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 92 transitions. [2020-08-19 00:27:28,748 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-19 00:27:28,748 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 92 transitions. [2020-08-19 00:27:28,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-19 00:27:28,748 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:28,749 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] [2020-08-19 00:27:28,749 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-19 00:27:28,749 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:28,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:28,749 INFO L82 PathProgramCache]: Analyzing trace with hash -261308320, now seen corresponding path program 21 times [2020-08-19 00:27:28,750 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:28,750 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1620054625] [2020-08-19 00:27:28,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:28,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:28,802 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:28,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:28,813 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:27:28,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:30,490 INFO L134 CoverageAnalysis]: Checked inductivity of 846 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 00:27:30,491 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1620054625] [2020-08-19 00:27:30,491 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:30,491 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-19 00:27:30,491 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1487974660] [2020-08-19 00:27:30,491 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-19 00:27:30,492 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:30,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-19 00:27:30,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=688, Unknown=0, NotChecked=0, Total=1190 [2020-08-19 00:27:30,492 INFO L87 Difference]: Start difference. First operand 89 states and 92 transitions. Second operand 35 states. [2020-08-19 00:27:30,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:30,974 INFO L93 Difference]: Finished difference Result 114 states and 120 transitions. [2020-08-19 00:27:30,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-19 00:27:30,975 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 84 [2020-08-19 00:27:30,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:30,976 INFO L225 Difference]: With dead ends: 114 [2020-08-19 00:27:30,976 INFO L226 Difference]: Without dead ends: 92 [2020-08-19 00:27:30,977 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 [2020-08-19 00:27:30,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-19 00:27:30,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-19 00:27:30,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-19 00:27:30,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 94 transitions. [2020-08-19 00:27:30,982 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 94 transitions. Word has length 84 [2020-08-19 00:27:30,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:30,982 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 94 transitions. [2020-08-19 00:27:30,982 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-19 00:27:30,982 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 94 transitions. [2020-08-19 00:27:30,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-19 00:27:30,983 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:30,983 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] [2020-08-19 00:27:30,983 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-19 00:27:30,983 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:30,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:30,984 INFO L82 PathProgramCache]: Analyzing trace with hash -1613047454, now seen corresponding path program 22 times [2020-08-19 00:27:30,984 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:30,984 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1653708233] [2020-08-19 00:27:30,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:31,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:31,038 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:31,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:31,049 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:27:31,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:32,739 INFO L134 CoverageAnalysis]: Checked inductivity of 905 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 00:27:32,740 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1653708233] [2020-08-19 00:27:32,740 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:32,740 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-19 00:27:32,740 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [783688140] [2020-08-19 00:27:32,740 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-19 00:27:32,740 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:32,741 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-19 00:27:32,741 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=726, Unknown=0, NotChecked=0, Total=1260 [2020-08-19 00:27:32,741 INFO L87 Difference]: Start difference. First operand 91 states and 94 transitions. Second operand 36 states. [2020-08-19 00:27:33,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:33,101 INFO L93 Difference]: Finished difference Result 116 states and 122 transitions. [2020-08-19 00:27:33,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-19 00:27:33,102 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 86 [2020-08-19 00:27:33,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:33,103 INFO L225 Difference]: With dead ends: 116 [2020-08-19 00:27:33,103 INFO L226 Difference]: Without dead ends: 94 [2020-08-19 00:27:33,104 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=608, Invalid=874, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 00:27:33,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-19 00:27:33,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-19 00:27:33,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-19 00:27:33,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 96 transitions. [2020-08-19 00:27:33,109 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 96 transitions. Word has length 86 [2020-08-19 00:27:33,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:33,109 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 96 transitions. [2020-08-19 00:27:33,109 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-19 00:27:33,109 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 96 transitions. [2020-08-19 00:27:33,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-19 00:27:33,110 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:33,110 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] [2020-08-19 00:27:33,110 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-19 00:27:33,111 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:33,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:33,111 INFO L82 PathProgramCache]: Analyzing trace with hash 740735460, now seen corresponding path program 23 times [2020-08-19 00:27:33,111 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:33,111 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [131255976] [2020-08-19 00:27:33,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:33,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:33,171 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:33,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:33,183 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:27:33,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:35,044 INFO L134 CoverageAnalysis]: Checked inductivity of 966 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 00:27:35,045 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [131255976] [2020-08-19 00:27:35,045 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:35,045 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-19 00:27:35,045 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1429768913] [2020-08-19 00:27:35,046 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-19 00:27:35,046 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:35,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-19 00:27:35,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=567, Invalid=765, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 00:27:35,047 INFO L87 Difference]: Start difference. First operand 93 states and 96 transitions. Second operand 37 states. [2020-08-19 00:27:35,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:35,550 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2020-08-19 00:27:35,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-19 00:27:35,551 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 88 [2020-08-19 00:27:35,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:35,552 INFO L225 Difference]: With dead ends: 118 [2020-08-19 00:27:35,552 INFO L226 Difference]: Without dead ends: 96 [2020-08-19 00:27:35,553 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 [2020-08-19 00:27:35,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-19 00:27:35,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-19 00:27:35,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-19 00:27:35,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 98 transitions. [2020-08-19 00:27:35,558 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 98 transitions. Word has length 88 [2020-08-19 00:27:35,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:35,558 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 98 transitions. [2020-08-19 00:27:35,558 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-19 00:27:35,558 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 98 transitions. [2020-08-19 00:27:35,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-19 00:27:35,559 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:35,559 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] [2020-08-19 00:27:35,559 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-19 00:27:35,559 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:35,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:35,560 INFO L82 PathProgramCache]: Analyzing trace with hash -721649178, now seen corresponding path program 24 times [2020-08-19 00:27:35,560 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:35,560 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [684099492] [2020-08-19 00:27:35,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:35,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:35,616 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:35,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:35,626 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:27:35,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:37,560 INFO L134 CoverageAnalysis]: Checked inductivity of 1029 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 00:27:37,560 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [684099492] [2020-08-19 00:27:37,560 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:37,561 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-19 00:27:37,561 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [456922926] [2020-08-19 00:27:37,561 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-19 00:27:37,561 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:37,562 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-19 00:27:37,562 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=805, Unknown=0, NotChecked=0, Total=1406 [2020-08-19 00:27:37,563 INFO L87 Difference]: Start difference. First operand 95 states and 98 transitions. Second operand 38 states. [2020-08-19 00:27:38,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:38,005 INFO L93 Difference]: Finished difference Result 120 states and 126 transitions. [2020-08-19 00:27:38,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-19 00:27:38,006 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 90 [2020-08-19 00:27:38,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:38,007 INFO L225 Difference]: With dead ends: 120 [2020-08-19 00:27:38,007 INFO L226 Difference]: Without dead ends: 98 [2020-08-19 00:27:38,008 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 [2020-08-19 00:27:38,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-19 00:27:38,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-19 00:27:38,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-19 00:27:38,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 100 transitions. [2020-08-19 00:27:38,014 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 100 transitions. Word has length 90 [2020-08-19 00:27:38,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:38,014 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 100 transitions. [2020-08-19 00:27:38,014 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-19 00:27:38,014 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 100 transitions. [2020-08-19 00:27:38,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-19 00:27:38,015 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:38,015 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] [2020-08-19 00:27:38,015 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-19 00:27:38,015 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:38,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:38,015 INFO L82 PathProgramCache]: Analyzing trace with hash -1618980504, now seen corresponding path program 25 times [2020-08-19 00:27:38,016 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:38,016 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2019493595] [2020-08-19 00:27:38,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:38,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:38,067 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:38,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:38,078 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:27:38,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:40,135 INFO L134 CoverageAnalysis]: Checked inductivity of 1094 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 00:27:40,135 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2019493595] [2020-08-19 00:27:40,135 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:40,135 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-19 00:27:40,135 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [498246953] [2020-08-19 00:27:40,136 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-19 00:27:40,136 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:40,136 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-19 00:27:40,137 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=636, Invalid=846, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 00:27:40,137 INFO L87 Difference]: Start difference. First operand 97 states and 100 transitions. Second operand 39 states. [2020-08-19 00:27:40,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:40,487 INFO L93 Difference]: Finished difference Result 122 states and 128 transitions. [2020-08-19 00:27:40,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-19 00:27:40,488 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 92 [2020-08-19 00:27:40,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:40,489 INFO L225 Difference]: With dead ends: 122 [2020-08-19 00:27:40,489 INFO L226 Difference]: Without dead ends: 100 [2020-08-19 00:27:40,490 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 [2020-08-19 00:27:40,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-19 00:27:40,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-19 00:27:40,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-19 00:27:40,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2020-08-19 00:27:40,495 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 92 [2020-08-19 00:27:40,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:40,495 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2020-08-19 00:27:40,495 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-19 00:27:40,495 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2020-08-19 00:27:40,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-19 00:27:40,496 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:40,496 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] [2020-08-19 00:27:40,496 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-19 00:27:40,497 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:40,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:40,497 INFO L82 PathProgramCache]: Analyzing trace with hash -665958294, now seen corresponding path program 26 times [2020-08-19 00:27:40,497 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:40,497 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2125076537] [2020-08-19 00:27:40,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:40,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:40,565 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:40,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:40,575 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:27:40,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:42,698 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 00:27:42,698 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2125076537] [2020-08-19 00:27:42,698 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:42,698 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-19 00:27:42,698 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1360262564] [2020-08-19 00:27:42,699 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-19 00:27:42,699 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:42,699 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-19 00:27:42,699 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=672, Invalid=888, Unknown=0, NotChecked=0, Total=1560 [2020-08-19 00:27:42,699 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand 40 states. [2020-08-19 00:27:43,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:43,024 INFO L93 Difference]: Finished difference Result 124 states and 130 transitions. [2020-08-19 00:27:43,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-19 00:27:43,027 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 94 [2020-08-19 00:27:43,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:43,028 INFO L225 Difference]: With dead ends: 124 [2020-08-19 00:27:43,028 INFO L226 Difference]: Without dead ends: 102 [2020-08-19 00:27:43,029 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=754, Invalid=1052, Unknown=0, NotChecked=0, Total=1806 [2020-08-19 00:27:43,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-19 00:27:43,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-19 00:27:43,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-19 00:27:43,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 104 transitions. [2020-08-19 00:27:43,034 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 104 transitions. Word has length 94 [2020-08-19 00:27:43,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:43,034 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 104 transitions. [2020-08-19 00:27:43,034 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-19 00:27:43,034 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 104 transitions. [2020-08-19 00:27:43,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-19 00:27:43,035 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:43,035 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] [2020-08-19 00:27:43,035 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-19 00:27:43,035 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:43,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:43,036 INFO L82 PathProgramCache]: Analyzing trace with hash 360351468, now seen corresponding path program 27 times [2020-08-19 00:27:43,036 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:43,036 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1261078021] [2020-08-19 00:27:43,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:43,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:43,100 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:43,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:43,111 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:27:43,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:45,351 INFO L134 CoverageAnalysis]: Checked inductivity of 1230 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 00:27:45,351 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1261078021] [2020-08-19 00:27:45,352 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:45,352 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-19 00:27:45,352 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [782797781] [2020-08-19 00:27:45,352 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-19 00:27:45,352 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:45,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-19 00:27:45,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=709, Invalid=931, Unknown=0, NotChecked=0, Total=1640 [2020-08-19 00:27:45,353 INFO L87 Difference]: Start difference. First operand 101 states and 104 transitions. Second operand 41 states. [2020-08-19 00:27:45,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:45,729 INFO L93 Difference]: Finished difference Result 126 states and 132 transitions. [2020-08-19 00:27:45,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-19 00:27:45,730 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 96 [2020-08-19 00:27:45,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:45,731 INFO L225 Difference]: With dead ends: 126 [2020-08-19 00:27:45,731 INFO L226 Difference]: Without dead ends: 104 [2020-08-19 00:27:45,732 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 [2020-08-19 00:27:45,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-19 00:27:45,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-19 00:27:45,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-19 00:27:45,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 106 transitions. [2020-08-19 00:27:45,737 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 106 transitions. Word has length 96 [2020-08-19 00:27:45,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:45,737 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 106 transitions. [2020-08-19 00:27:45,737 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-19 00:27:45,737 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 106 transitions. [2020-08-19 00:27:45,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-19 00:27:45,738 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:45,738 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] [2020-08-19 00:27:45,738 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-19 00:27:45,738 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:45,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:45,738 INFO L82 PathProgramCache]: Analyzing trace with hash -1198445330, now seen corresponding path program 28 times [2020-08-19 00:27:45,739 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:45,739 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [463841319] [2020-08-19 00:27:45,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:45,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:45,796 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:45,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:45,809 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:27:45,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:48,171 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 00:27:48,172 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [463841319] [2020-08-19 00:27:48,172 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:48,172 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-19 00:27:48,172 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1391619300] [2020-08-19 00:27:48,172 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-19 00:27:48,172 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:48,173 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-19 00:27:48,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=747, Invalid=975, Unknown=0, NotChecked=0, Total=1722 [2020-08-19 00:27:48,173 INFO L87 Difference]: Start difference. First operand 103 states and 106 transitions. Second operand 42 states. [2020-08-19 00:27:48,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:48,636 INFO L93 Difference]: Finished difference Result 128 states and 134 transitions. [2020-08-19 00:27:48,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-19 00:27:48,637 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 98 [2020-08-19 00:27:48,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:48,638 INFO L225 Difference]: With dead ends: 128 [2020-08-19 00:27:48,639 INFO L226 Difference]: Without dead ends: 106 [2020-08-19 00:27:48,640 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 [2020-08-19 00:27:48,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-19 00:27:48,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-19 00:27:48,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-19 00:27:48,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 108 transitions. [2020-08-19 00:27:48,645 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 108 transitions. Word has length 98 [2020-08-19 00:27:48,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:48,646 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 108 transitions. [2020-08-19 00:27:48,646 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-19 00:27:48,646 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 108 transitions. [2020-08-19 00:27:48,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-19 00:27:48,646 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:48,647 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] [2020-08-19 00:27:48,647 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-19 00:27:48,647 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:48,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:48,647 INFO L82 PathProgramCache]: Analyzing trace with hash -258581904, now seen corresponding path program 29 times [2020-08-19 00:27:48,647 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:48,648 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [69403692] [2020-08-19 00:27:48,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:48,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:48,709 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:48,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:48,724 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:27:48,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:51,184 INFO L134 CoverageAnalysis]: Checked inductivity of 1374 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 00:27:51,185 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [69403692] [2020-08-19 00:27:51,185 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 00:27:51,185 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-19 00:27:51,185 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [298801805] [2020-08-19 00:27:51,185 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-19 00:27:51,185 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:27:51,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-19 00:27:51,187 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=786, Invalid=1020, Unknown=0, NotChecked=0, Total=1806 [2020-08-19 00:27:51,187 INFO L87 Difference]: Start difference. First operand 105 states and 108 transitions. Second operand 43 states. [2020-08-19 00:27:51,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:27:51,821 INFO L93 Difference]: Finished difference Result 130 states and 136 transitions. [2020-08-19 00:27:51,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-19 00:27:51,822 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 100 [2020-08-19 00:27:51,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:27:51,823 INFO L225 Difference]: With dead ends: 130 [2020-08-19 00:27:51,823 INFO L226 Difference]: Without dead ends: 108 [2020-08-19 00:27:51,825 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 [2020-08-19 00:27:51,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-08-19 00:27:51,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-08-19 00:27:51,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-19 00:27:51,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 110 transitions. [2020-08-19 00:27:51,830 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 110 transitions. Word has length 100 [2020-08-19 00:27:51,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:27:51,830 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 110 transitions. [2020-08-19 00:27:51,830 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-19 00:27:51,830 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 110 transitions. [2020-08-19 00:27:51,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-19 00:27:51,831 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:27:51,831 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] [2020-08-19 00:27:51,831 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-19 00:27:51,831 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:27:51,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:27:51,831 INFO L82 PathProgramCache]: Analyzing trace with hash 1007038322, now seen corresponding path program 30 times [2020-08-19 00:27:51,832 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:27:51,832 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1358145985] [2020-08-19 00:27:51,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:27:51,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:51,895 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:27:51,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:27:51,908 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:27:51,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat