/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=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.5 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/afnp2014.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-19 06:56:43,331 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-19 06:56:43,334 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-19 06:56:43,375 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-19 06:56:43,375 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-19 06:56:43,384 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-19 06:56:43,387 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-19 06:56:43,390 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-19 06:56:43,393 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-19 06:56:43,396 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-19 06:56:43,397 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-19 06:56:43,398 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-19 06:56:43,398 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 06:56:43,401 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 06:56:43,403 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 06:56:43,404 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 06:56:43,406 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 06:56:43,408 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 06:56:43,409 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 06:56:43,418 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 06:56:43,420 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 06:56:43,421 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 06:56:43,422 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 06:56:43,422 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 06:56:43,438 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-19 06:56:43,452 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 06:56:43,453 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 06:56:43,454 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 06:56:43,455 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 06:56:43,495 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 06:56:43,496 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 06:56:43,497 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 06:56:43,497 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 06:56:43,497 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 06:56:43,497 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 06:56:43,498 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 06:56:43,498 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 06:56:43,498 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 06:56:43,498 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 06:56:43,498 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 06:56:43,499 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 06:56:43,499 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 06:56:43,499 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 06:56:43,499 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 06:56:43,499 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 06:56:43,499 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 06:56:43,500 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 06:56:43,500 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 06:56:43,500 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 06:56:43,500 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 06:56:43,500 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 06:56:43,501 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 06:56:43,501 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 06:56:43,501 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 06:56:43,501 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 06:56:43,501 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 06:56:43,502 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 06:56:43,502 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 06:56:43,502 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=SMALLESTAMONGWIDE;tolerance=0.5; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.5; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.5; [2020-08-19 06:56:43,787 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 06:56:43,799 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 06:56:43,809 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 06:56:43,811 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 06:56:43,812 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 06:56:43,812 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/afnp2014.i [2020-08-19 06:56:43,883 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/91855e7f4/fe0687509cbb43969e8048c81b18aa13/FLAGfbdc82b70 [2020-08-19 06:56:44,356 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 06:56:44,357 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/afnp2014.i [2020-08-19 06:56:44,364 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/91855e7f4/fe0687509cbb43969e8048c81b18aa13/FLAGfbdc82b70 [2020-08-19 06:56:44,700 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/91855e7f4/fe0687509cbb43969e8048c81b18aa13 [2020-08-19 06:56:44,707 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 06:56:44,709 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 06:56:44,709 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 06:56:44,710 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 06:56:44,713 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 06:56:44,713 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 06:56:44" (1/1) ... [2020-08-19 06:56:44,716 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5201ae70 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:56:44, skipping insertion in model container [2020-08-19 06:56:44,716 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 06:56:44" (1/1) ... [2020-08-19 06:56:44,724 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 06:56:44,740 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 06:56:44,940 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 06:56:44,944 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 06:56:44,957 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 06:56:44,969 INFO L208 MainTranslator]: Completed translation [2020-08-19 06:56:44,969 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:56:44 WrapperNode [2020-08-19 06:56:44,969 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 06:56:44,970 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 06:56:44,970 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 06:56:44,970 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 06:56:44,980 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:56:44" (1/1) ... [2020-08-19 06:56:44,980 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:56:44" (1/1) ... [2020-08-19 06:56:44,985 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:56:44" (1/1) ... [2020-08-19 06:56:44,985 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:56:44" (1/1) ... [2020-08-19 06:56:44,988 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:56:44" (1/1) ... [2020-08-19 06:56:44,992 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:56:44" (1/1) ... [2020-08-19 06:56:44,993 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:56:44" (1/1) ... [2020-08-19 06:56:45,080 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 06:56:45,080 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 06:56:45,080 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 06:56:45,081 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 06:56:45,081 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:56:44" (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 06:56:45,146 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 06:56:45,146 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 06:56:45,146 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-19 06:56:45,147 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-19 06:56:45,147 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 06:56:45,147 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 06:56:45,147 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-19 06:56:45,147 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-19 06:56:45,147 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-19 06:56:45,148 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-19 06:56:45,148 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 06:56:45,148 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 06:56:45,148 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 06:56:45,318 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 06:56:45,319 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-19 06:56:45,323 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 06:56:45 BoogieIcfgContainer [2020-08-19 06:56:45,323 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 06:56:45,324 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 06:56:45,324 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 06:56:45,327 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 06:56:45,328 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 06:56:44" (1/3) ... [2020-08-19 06:56:45,329 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3da69adf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 06:56:45, skipping insertion in model container [2020-08-19 06:56:45,329 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:56:44" (2/3) ... [2020-08-19 06:56:45,329 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3da69adf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 06:56:45, skipping insertion in model container [2020-08-19 06:56:45,330 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 06:56:45" (3/3) ... [2020-08-19 06:56:45,331 INFO L109 eAbstractionObserver]: Analyzing ICFG afnp2014.i [2020-08-19 06:56:45,342 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 06:56:45,349 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 06:56:45,363 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 06:56:45,386 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 06:56:45,386 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 06:56:45,386 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 06:56:45,386 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 06:56:45,386 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 06:56:45,386 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 06:56:45,386 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 06:56:45,386 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 06:56:45,403 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-08-19 06:56:45,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-19 06:56:45,408 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:45,409 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:45,409 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:45,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:45,414 INFO L82 PathProgramCache]: Analyzing trace with hash -1915647303, now seen corresponding path program 1 times [2020-08-19 06:56:45,421 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:45,422 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [850517427] [2020-08-19 06:56:45,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:45,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:45,520 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:45,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:45,526 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 06:56:45,527 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [850517427] [2020-08-19 06:56:45,529 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 06:56:45,529 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-19 06:56:45,530 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1815127711] [2020-08-19 06:56:45,535 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-19 06:56:45,536 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:45,550 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-19 06:56:45,551 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-19 06:56:45,554 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2020-08-19 06:56:45,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:45,579 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2020-08-19 06:56:45,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-19 06:56:45,581 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-08-19 06:56:45,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:45,590 INFO L225 Difference]: With dead ends: 32 [2020-08-19 06:56:45,590 INFO L226 Difference]: Without dead ends: 13 [2020-08-19 06:56:45,594 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-19 06:56:45,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-19 06:56:45,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-19 06:56:45,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-19 06:56:45,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2020-08-19 06:56:45,636 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2020-08-19 06:56:45,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:45,637 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2020-08-19 06:56:45,637 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-19 06:56:45,637 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2020-08-19 06:56:45,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-19 06:56:45,638 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:45,638 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:45,639 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 06:56:45,639 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:45,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:45,640 INFO L82 PathProgramCache]: Analyzing trace with hash 2084433522, now seen corresponding path program 1 times [2020-08-19 06:56:45,640 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:45,640 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2017243464] [2020-08-19 06:56:45,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:45,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:45,763 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:45,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:45,768 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 06:56:45,769 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2017243464] [2020-08-19 06:56:45,770 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 06:56:45,770 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-19 06:56:45,770 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [645976675] [2020-08-19 06:56:45,772 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 06:56:45,772 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:45,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 06:56:45,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-19 06:56:45,774 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 5 states. [2020-08-19 06:56:45,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:45,831 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2020-08-19 06:56:45,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 06:56:45,832 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-19 06:56:45,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:45,833 INFO L225 Difference]: With dead ends: 21 [2020-08-19 06:56:45,834 INFO L226 Difference]: Without dead ends: 16 [2020-08-19 06:56:45,835 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 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 06:56:45,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-19 06:56:45,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-19 06:56:45,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-19 06:56:45,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-19 06:56:45,841 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 12 [2020-08-19 06:56:45,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:45,841 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-19 06:56:45,841 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 06:56:45,842 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-19 06:56:45,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-19 06:56:45,842 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:45,843 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:45,843 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 06:56:45,843 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:45,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:45,845 INFO L82 PathProgramCache]: Analyzing trace with hash 249504553, now seen corresponding path program 1 times [2020-08-19 06:56:45,845 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:45,846 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2085521787] [2020-08-19 06:56:45,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:45,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:45,983 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:45,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:45,988 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:45,989 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2085521787] [2020-08-19 06:56:45,989 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:45,989 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-19 06:56:45,990 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2031703050] [2020-08-19 06:56:45,990 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 06:56:45,990 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:45,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 06:56:45,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-19 06:56:45,991 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 6 states. [2020-08-19 06:56:46,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:46,051 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-08-19 06:56:46,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-19 06:56:46,051 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-08-19 06:56:46,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:46,052 INFO L225 Difference]: With dead ends: 24 [2020-08-19 06:56:46,053 INFO L226 Difference]: Without dead ends: 19 [2020-08-19 06:56:46,054 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-19 06:56:46,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-19 06:56:46,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-19 06:56:46,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-19 06:56:46,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2020-08-19 06:56:46,060 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 15 [2020-08-19 06:56:46,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:46,060 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2020-08-19 06:56:46,060 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 06:56:46,061 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2020-08-19 06:56:46,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-19 06:56:46,061 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:46,062 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:46,062 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 06:56:46,062 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:46,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:46,063 INFO L82 PathProgramCache]: Analyzing trace with hash -2070634734, now seen corresponding path program 2 times [2020-08-19 06:56:46,063 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:46,064 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1565698361] [2020-08-19 06:56:46,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:46,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:46,196 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:46,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:46,201 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 06:56:46,202 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1565698361] [2020-08-19 06:56:46,202 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:46,202 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-19 06:56:46,203 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [846166382] [2020-08-19 06:56:46,203 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 06:56:46,203 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:46,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 06:56:46,204 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-19 06:56:46,204 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand 7 states. [2020-08-19 06:56:46,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:46,275 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2020-08-19 06:56:46,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 06:56:46,276 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2020-08-19 06:56:46,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:46,277 INFO L225 Difference]: With dead ends: 27 [2020-08-19 06:56:46,277 INFO L226 Difference]: Without dead ends: 22 [2020-08-19 06:56:46,278 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-19 06:56:46,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-19 06:56:46,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-19 06:56:46,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-19 06:56:46,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2020-08-19 06:56:46,284 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 18 [2020-08-19 06:56:46,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:46,284 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2020-08-19 06:56:46,285 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 06:56:46,285 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2020-08-19 06:56:46,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-19 06:56:46,285 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:46,286 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:46,286 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-19 06:56:46,286 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:46,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:46,287 INFO L82 PathProgramCache]: Analyzing trace with hash 1863528073, now seen corresponding path program 3 times [2020-08-19 06:56:46,287 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:46,287 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1333906424] [2020-08-19 06:56:46,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:46,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:46,434 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:46,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:46,438 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:46,439 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1333906424] [2020-08-19 06:56:46,439 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:46,439 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-19 06:56:46,440 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1385378520] [2020-08-19 06:56:46,440 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-19 06:56:46,441 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:46,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-19 06:56:46,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-08-19 06:56:46,442 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand 8 states. [2020-08-19 06:56:46,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:46,535 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2020-08-19 06:56:46,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-19 06:56:46,535 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2020-08-19 06:56:46,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:46,536 INFO L225 Difference]: With dead ends: 30 [2020-08-19 06:56:46,536 INFO L226 Difference]: Without dead ends: 25 [2020-08-19 06:56:46,537 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2020-08-19 06:56:46,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-19 06:56:46,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-19 06:56:46,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-19 06:56:46,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2020-08-19 06:56:46,544 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 21 [2020-08-19 06:56:46,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:46,544 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2020-08-19 06:56:46,545 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-19 06:56:46,545 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2020-08-19 06:56:46,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-19 06:56:46,546 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:46,546 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:46,546 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-19 06:56:46,546 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:46,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:46,547 INFO L82 PathProgramCache]: Analyzing trace with hash -854829134, now seen corresponding path program 4 times [2020-08-19 06:56:46,547 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:46,548 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [363356257] [2020-08-19 06:56:46,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:46,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:46,675 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:46,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:46,679 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:46,679 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [363356257] [2020-08-19 06:56:46,679 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:46,680 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-19 06:56:46,680 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1197545886] [2020-08-19 06:56:46,680 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-19 06:56:46,681 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:46,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-19 06:56:46,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-19 06:56:46,681 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand 9 states. [2020-08-19 06:56:46,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:46,769 INFO L93 Difference]: Finished difference Result 33 states and 39 transitions. [2020-08-19 06:56:46,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-19 06:56:46,770 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 24 [2020-08-19 06:56:46,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:46,771 INFO L225 Difference]: With dead ends: 33 [2020-08-19 06:56:46,771 INFO L226 Difference]: Without dead ends: 28 [2020-08-19 06:56:46,772 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2020-08-19 06:56:46,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-19 06:56:46,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-19 06:56:46,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-19 06:56:46,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2020-08-19 06:56:46,778 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 24 [2020-08-19 06:56:46,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:46,779 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2020-08-19 06:56:46,779 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-19 06:56:46,779 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2020-08-19 06:56:46,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-19 06:56:46,780 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:46,780 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:46,780 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-19 06:56:46,781 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:46,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:46,781 INFO L82 PathProgramCache]: Analyzing trace with hash -1826016791, now seen corresponding path program 5 times [2020-08-19 06:56:46,781 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:46,782 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2067490436] [2020-08-19 06:56:46,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:46,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:46,895 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:46,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:46,899 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:46,900 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2067490436] [2020-08-19 06:56:46,900 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:46,900 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-19 06:56:46,900 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [811384245] [2020-08-19 06:56:46,901 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-19 06:56:46,901 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:46,901 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-19 06:56:46,902 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2020-08-19 06:56:46,902 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand 10 states. [2020-08-19 06:56:47,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:47,011 INFO L93 Difference]: Finished difference Result 36 states and 43 transitions. [2020-08-19 06:56:47,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-19 06:56:47,011 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-08-19 06:56:47,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:47,012 INFO L225 Difference]: With dead ends: 36 [2020-08-19 06:56:47,012 INFO L226 Difference]: Without dead ends: 31 [2020-08-19 06:56:47,013 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2020-08-19 06:56:47,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-19 06:56:47,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-19 06:56:47,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-19 06:56:47,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 38 transitions. [2020-08-19 06:56:47,019 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 38 transitions. Word has length 27 [2020-08-19 06:56:47,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:47,020 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 38 transitions. [2020-08-19 06:56:47,020 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-19 06:56:47,020 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 38 transitions. [2020-08-19 06:56:47,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-19 06:56:47,021 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:47,021 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:47,022 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-19 06:56:47,022 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:47,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:47,022 INFO L82 PathProgramCache]: Analyzing trace with hash 717166674, now seen corresponding path program 6 times [2020-08-19 06:56:47,022 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:47,023 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1046731654] [2020-08-19 06:56:47,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:47,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:47,145 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:47,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:47,149 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:47,150 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1046731654] [2020-08-19 06:56:47,150 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:47,150 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-19 06:56:47,150 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [469552891] [2020-08-19 06:56:47,151 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-19 06:56:47,151 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:47,151 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-19 06:56:47,152 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-19 06:56:47,152 INFO L87 Difference]: Start difference. First operand 31 states and 38 transitions. Second operand 11 states. [2020-08-19 06:56:47,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:47,271 INFO L93 Difference]: Finished difference Result 39 states and 47 transitions. [2020-08-19 06:56:47,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-19 06:56:47,271 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-19 06:56:47,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:47,273 INFO L225 Difference]: With dead ends: 39 [2020-08-19 06:56:47,273 INFO L226 Difference]: Without dead ends: 34 [2020-08-19 06:56:47,274 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2020-08-19 06:56:47,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-19 06:56:47,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-19 06:56:47,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-19 06:56:47,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2020-08-19 06:56:47,281 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 30 [2020-08-19 06:56:47,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:47,281 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2020-08-19 06:56:47,281 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-19 06:56:47,282 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2020-08-19 06:56:47,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-19 06:56:47,283 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:47,283 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:47,283 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-19 06:56:47,283 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:47,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:47,284 INFO L82 PathProgramCache]: Analyzing trace with hash 1472671049, now seen corresponding path program 7 times [2020-08-19 06:56:47,284 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:47,285 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1381665162] [2020-08-19 06:56:47,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:47,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:47,425 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:47,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:47,432 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:47,432 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1381665162] [2020-08-19 06:56:47,433 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:47,433 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-19 06:56:47,433 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [772154057] [2020-08-19 06:56:47,434 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-19 06:56:47,434 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:47,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-19 06:56:47,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2020-08-19 06:56:47,435 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand 12 states. [2020-08-19 06:56:47,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:47,584 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2020-08-19 06:56:47,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-19 06:56:47,585 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 33 [2020-08-19 06:56:47,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:47,586 INFO L225 Difference]: With dead ends: 42 [2020-08-19 06:56:47,586 INFO L226 Difference]: Without dead ends: 37 [2020-08-19 06:56:47,587 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2020-08-19 06:56:47,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-19 06:56:47,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-19 06:56:47,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-19 06:56:47,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 46 transitions. [2020-08-19 06:56:47,593 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 46 transitions. Word has length 33 [2020-08-19 06:56:47,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:47,593 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 46 transitions. [2020-08-19 06:56:47,593 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-19 06:56:47,593 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 46 transitions. [2020-08-19 06:56:47,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-19 06:56:47,594 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:47,595 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:47,595 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-19 06:56:47,595 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:47,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:47,596 INFO L82 PathProgramCache]: Analyzing trace with hash -1220091662, now seen corresponding path program 8 times [2020-08-19 06:56:47,596 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:47,596 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1856431286] [2020-08-19 06:56:47,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:47,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:47,791 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:47,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:47,798 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 108 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:47,798 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1856431286] [2020-08-19 06:56:47,799 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:47,799 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-19 06:56:47,799 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2047258940] [2020-08-19 06:56:47,800 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-19 06:56:47,800 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:47,801 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-19 06:56:47,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-19 06:56:47,801 INFO L87 Difference]: Start difference. First operand 37 states and 46 transitions. Second operand 13 states. [2020-08-19 06:56:47,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:47,996 INFO L93 Difference]: Finished difference Result 45 states and 55 transitions. [2020-08-19 06:56:47,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-19 06:56:47,997 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-19 06:56:47,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:47,999 INFO L225 Difference]: With dead ends: 45 [2020-08-19 06:56:47,999 INFO L226 Difference]: Without dead ends: 40 [2020-08-19 06:56:47,999 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=155, Unknown=0, NotChecked=0, Total=182 [2020-08-19 06:56:48,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-19 06:56:48,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-19 06:56:48,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-19 06:56:48,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 50 transitions. [2020-08-19 06:56:48,015 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 50 transitions. Word has length 36 [2020-08-19 06:56:48,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:48,015 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 50 transitions. [2020-08-19 06:56:48,015 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-19 06:56:48,015 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 50 transitions. [2020-08-19 06:56:48,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-19 06:56:48,019 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:48,020 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:48,020 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-19 06:56:48,020 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:48,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:48,022 INFO L82 PathProgramCache]: Analyzing trace with hash 85139625, now seen corresponding path program 9 times [2020-08-19 06:56:48,022 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:48,023 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [587821693] [2020-08-19 06:56:48,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:48,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:48,243 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:48,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:48,247 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:48,248 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [587821693] [2020-08-19 06:56:48,248 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:48,248 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-19 06:56:48,249 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1686204700] [2020-08-19 06:56:48,249 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-19 06:56:48,249 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:48,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-19 06:56:48,250 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2020-08-19 06:56:48,250 INFO L87 Difference]: Start difference. First operand 40 states and 50 transitions. Second operand 14 states. [2020-08-19 06:56:48,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:48,446 INFO L93 Difference]: Finished difference Result 48 states and 59 transitions. [2020-08-19 06:56:48,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-19 06:56:48,447 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 39 [2020-08-19 06:56:48,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:48,448 INFO L225 Difference]: With dead ends: 48 [2020-08-19 06:56:48,448 INFO L226 Difference]: Without dead ends: 43 [2020-08-19 06:56:48,449 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=181, Unknown=0, NotChecked=0, Total=210 [2020-08-19 06:56:48,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-19 06:56:48,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-19 06:56:48,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-19 06:56:48,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 54 transitions. [2020-08-19 06:56:48,460 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 54 transitions. Word has length 39 [2020-08-19 06:56:48,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:48,460 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 54 transitions. [2020-08-19 06:56:48,460 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-19 06:56:48,460 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 54 transitions. [2020-08-19 06:56:48,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-19 06:56:48,465 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:48,466 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:48,466 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-19 06:56:48,466 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:48,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:48,467 INFO L82 PathProgramCache]: Analyzing trace with hash 1891479954, now seen corresponding path program 10 times [2020-08-19 06:56:48,467 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:48,467 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1554740841] [2020-08-19 06:56:48,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:48,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:48,697 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:48,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:48,703 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 165 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:48,703 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1554740841] [2020-08-19 06:56:48,703 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:48,703 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-19 06:56:48,704 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1549268200] [2020-08-19 06:56:48,704 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-19 06:56:48,704 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:48,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-19 06:56:48,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-08-19 06:56:48,705 INFO L87 Difference]: Start difference. First operand 43 states and 54 transitions. Second operand 15 states. [2020-08-19 06:56:48,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:48,930 INFO L93 Difference]: Finished difference Result 51 states and 63 transitions. [2020-08-19 06:56:48,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-19 06:56:48,931 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 42 [2020-08-19 06:56:48,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:48,932 INFO L225 Difference]: With dead ends: 51 [2020-08-19 06:56:48,932 INFO L226 Difference]: Without dead ends: 46 [2020-08-19 06:56:48,933 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=209, Unknown=0, NotChecked=0, Total=240 [2020-08-19 06:56:48,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-19 06:56:48,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-19 06:56:48,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-19 06:56:48,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 58 transitions. [2020-08-19 06:56:48,939 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 58 transitions. Word has length 42 [2020-08-19 06:56:48,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:48,940 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 58 transitions. [2020-08-19 06:56:48,940 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-19 06:56:48,940 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 58 transitions. [2020-08-19 06:56:48,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-19 06:56:48,941 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:48,941 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:48,941 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-19 06:56:48,941 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:48,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:48,942 INFO L82 PathProgramCache]: Analyzing trace with hash -1363997687, now seen corresponding path program 11 times [2020-08-19 06:56:48,942 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:48,942 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [22524661] [2020-08-19 06:56:48,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:48,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:49,116 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:49,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:49,122 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:49,123 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [22524661] [2020-08-19 06:56:49,123 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:49,123 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-19 06:56:49,124 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [117951557] [2020-08-19 06:56:49,124 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-19 06:56:49,124 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:49,125 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-19 06:56:49,125 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2020-08-19 06:56:49,125 INFO L87 Difference]: Start difference. First operand 46 states and 58 transitions. Second operand 16 states. [2020-08-19 06:56:49,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:49,424 INFO L93 Difference]: Finished difference Result 54 states and 67 transitions. [2020-08-19 06:56:49,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-19 06:56:49,425 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 45 [2020-08-19 06:56:49,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:49,426 INFO L225 Difference]: With dead ends: 54 [2020-08-19 06:56:49,426 INFO L226 Difference]: Without dead ends: 49 [2020-08-19 06:56:49,426 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=239, Unknown=0, NotChecked=0, Total=272 [2020-08-19 06:56:49,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-19 06:56:49,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-19 06:56:49,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-19 06:56:49,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 62 transitions. [2020-08-19 06:56:49,433 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 62 transitions. Word has length 45 [2020-08-19 06:56:49,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:49,434 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 62 transitions. [2020-08-19 06:56:49,434 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-19 06:56:49,434 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 62 transitions. [2020-08-19 06:56:49,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-19 06:56:49,435 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:49,435 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:49,436 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-19 06:56:49,436 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:49,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:49,436 INFO L82 PathProgramCache]: Analyzing trace with hash -641889742, now seen corresponding path program 12 times [2020-08-19 06:56:49,436 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:49,437 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [719272510] [2020-08-19 06:56:49,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:49,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:49,654 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:49,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:49,663 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 234 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:49,664 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [719272510] [2020-08-19 06:56:49,664 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:49,665 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-19 06:56:49,665 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1351111460] [2020-08-19 06:56:49,666 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-19 06:56:49,666 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:49,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-19 06:56:49,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-19 06:56:49,667 INFO L87 Difference]: Start difference. First operand 49 states and 62 transitions. Second operand 17 states. [2020-08-19 06:56:49,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:49,975 INFO L93 Difference]: Finished difference Result 57 states and 71 transitions. [2020-08-19 06:56:49,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-19 06:56:49,976 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-19 06:56:49,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:49,977 INFO L225 Difference]: With dead ends: 57 [2020-08-19 06:56:49,977 INFO L226 Difference]: Without dead ends: 52 [2020-08-19 06:56:49,978 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=271, Unknown=0, NotChecked=0, Total=306 [2020-08-19 06:56:49,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-19 06:56:49,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-19 06:56:49,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-19 06:56:49,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 66 transitions. [2020-08-19 06:56:49,985 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 66 transitions. Word has length 48 [2020-08-19 06:56:49,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:49,985 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 66 transitions. [2020-08-19 06:56:49,985 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-19 06:56:49,985 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 66 transitions. [2020-08-19 06:56:49,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-19 06:56:49,986 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:49,986 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:49,987 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-19 06:56:49,987 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:49,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:49,987 INFO L82 PathProgramCache]: Analyzing trace with hash -1815285911, now seen corresponding path program 13 times [2020-08-19 06:56:49,987 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:49,988 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1478388094] [2020-08-19 06:56:49,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:50,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:50,247 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:50,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:50,257 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 273 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:50,258 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1478388094] [2020-08-19 06:56:50,259 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:50,259 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-19 06:56:50,259 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1761127854] [2020-08-19 06:56:50,260 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-19 06:56:50,261 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:50,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-19 06:56:50,261 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2020-08-19 06:56:50,262 INFO L87 Difference]: Start difference. First operand 52 states and 66 transitions. Second operand 18 states. [2020-08-19 06:56:50,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:50,590 INFO L93 Difference]: Finished difference Result 60 states and 75 transitions. [2020-08-19 06:56:50,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-19 06:56:50,591 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 51 [2020-08-19 06:56:50,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:50,591 INFO L225 Difference]: With dead ends: 60 [2020-08-19 06:56:50,592 INFO L226 Difference]: Without dead ends: 55 [2020-08-19 06:56:50,592 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=37, Invalid=305, Unknown=0, NotChecked=0, Total=342 [2020-08-19 06:56:50,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-19 06:56:50,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-19 06:56:50,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-19 06:56:50,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 70 transitions. [2020-08-19 06:56:50,608 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 70 transitions. Word has length 51 [2020-08-19 06:56:50,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:50,610 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 70 transitions. [2020-08-19 06:56:50,610 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-19 06:56:50,611 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 70 transitions. [2020-08-19 06:56:50,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-19 06:56:50,611 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:50,612 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:50,612 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-19 06:56:50,612 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:50,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:50,613 INFO L82 PathProgramCache]: Analyzing trace with hash -1721734446, now seen corresponding path program 14 times [2020-08-19 06:56:50,613 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:50,613 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [980198929] [2020-08-19 06:56:50,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:50,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:50,893 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:50,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:50,902 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 315 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:50,903 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [980198929] [2020-08-19 06:56:50,905 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:50,905 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-19 06:56:50,905 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1819621514] [2020-08-19 06:56:50,906 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-19 06:56:50,906 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:50,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-19 06:56:50,907 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-08-19 06:56:50,907 INFO L87 Difference]: Start difference. First operand 55 states and 70 transitions. Second operand 19 states. [2020-08-19 06:56:51,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:51,277 INFO L93 Difference]: Finished difference Result 63 states and 79 transitions. [2020-08-19 06:56:51,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-19 06:56:51,277 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 54 [2020-08-19 06:56:51,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:51,279 INFO L225 Difference]: With dead ends: 63 [2020-08-19 06:56:51,279 INFO L226 Difference]: Without dead ends: 58 [2020-08-19 06:56:51,280 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=341, Unknown=0, NotChecked=0, Total=380 [2020-08-19 06:56:51,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-19 06:56:51,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-19 06:56:51,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-19 06:56:51,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 74 transitions. [2020-08-19 06:56:51,298 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 74 transitions. Word has length 54 [2020-08-19 06:56:51,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:51,298 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 74 transitions. [2020-08-19 06:56:51,298 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-19 06:56:51,299 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 74 transitions. [2020-08-19 06:56:51,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-19 06:56:51,302 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:51,302 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:51,302 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-19 06:56:51,302 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:51,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:51,303 INFO L82 PathProgramCache]: Analyzing trace with hash 2131151561, now seen corresponding path program 15 times [2020-08-19 06:56:51,303 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:51,303 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [430150391] [2020-08-19 06:56:51,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:51,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:51,583 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:51,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:51,591 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 0 proven. 360 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:51,591 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [430150391] [2020-08-19 06:56:51,591 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:51,591 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-19 06:56:51,592 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1655100625] [2020-08-19 06:56:51,592 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-19 06:56:51,592 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:51,593 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-19 06:56:51,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2020-08-19 06:56:51,593 INFO L87 Difference]: Start difference. First operand 58 states and 74 transitions. Second operand 20 states. [2020-08-19 06:56:51,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:51,977 INFO L93 Difference]: Finished difference Result 66 states and 83 transitions. [2020-08-19 06:56:51,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-19 06:56:51,978 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 57 [2020-08-19 06:56:51,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:51,979 INFO L225 Difference]: With dead ends: 66 [2020-08-19 06:56:51,979 INFO L226 Difference]: Without dead ends: 61 [2020-08-19 06:56:51,980 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=379, Unknown=0, NotChecked=0, Total=420 [2020-08-19 06:56:51,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-19 06:56:51,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2020-08-19 06:56:51,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-19 06:56:51,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 78 transitions. [2020-08-19 06:56:51,987 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 78 transitions. Word has length 57 [2020-08-19 06:56:51,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:51,987 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 78 transitions. [2020-08-19 06:56:51,988 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-19 06:56:51,988 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 78 transitions. [2020-08-19 06:56:51,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-19 06:56:51,988 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:51,989 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:51,989 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-19 06:56:51,989 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:51,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:51,989 INFO L82 PathProgramCache]: Analyzing trace with hash 457200498, now seen corresponding path program 16 times [2020-08-19 06:56:51,990 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:51,990 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [325688836] [2020-08-19 06:56:51,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:52,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:52,305 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:52,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:52,312 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 0 proven. 408 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:52,313 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [325688836] [2020-08-19 06:56:52,313 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:52,313 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-19 06:56:52,313 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [140014936] [2020-08-19 06:56:52,314 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-19 06:56:52,314 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:52,314 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-19 06:56:52,315 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-08-19 06:56:52,315 INFO L87 Difference]: Start difference. First operand 61 states and 78 transitions. Second operand 21 states. [2020-08-19 06:56:52,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:52,739 INFO L93 Difference]: Finished difference Result 69 states and 87 transitions. [2020-08-19 06:56:52,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-19 06:56:52,740 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 60 [2020-08-19 06:56:52,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:52,741 INFO L225 Difference]: With dead ends: 69 [2020-08-19 06:56:52,741 INFO L226 Difference]: Without dead ends: 64 [2020-08-19 06:56:52,743 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=43, Invalid=419, Unknown=0, NotChecked=0, Total=462 [2020-08-19 06:56:52,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-19 06:56:52,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2020-08-19 06:56:52,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-19 06:56:52,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 82 transitions. [2020-08-19 06:56:52,749 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 82 transitions. Word has length 60 [2020-08-19 06:56:52,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:52,749 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 82 transitions. [2020-08-19 06:56:52,750 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-19 06:56:52,750 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 82 transitions. [2020-08-19 06:56:52,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-08-19 06:56:52,750 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:52,751 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:52,751 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-19 06:56:52,751 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:52,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:52,751 INFO L82 PathProgramCache]: Analyzing trace with hash 646356521, now seen corresponding path program 17 times [2020-08-19 06:56:52,752 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:52,752 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1594293978] [2020-08-19 06:56:52,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:52,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:53,072 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:53,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:53,090 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 0 proven. 459 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:53,091 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1594293978] [2020-08-19 06:56:53,091 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:53,091 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-19 06:56:53,091 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1048426660] [2020-08-19 06:56:53,093 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-19 06:56:53,093 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:53,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-19 06:56:53,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=421, Unknown=0, NotChecked=0, Total=462 [2020-08-19 06:56:53,094 INFO L87 Difference]: Start difference. First operand 64 states and 82 transitions. Second operand 22 states. [2020-08-19 06:56:53,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:53,558 INFO L93 Difference]: Finished difference Result 72 states and 91 transitions. [2020-08-19 06:56:53,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-19 06:56:53,559 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 63 [2020-08-19 06:56:53,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:53,560 INFO L225 Difference]: With dead ends: 72 [2020-08-19 06:56:53,560 INFO L226 Difference]: Without dead ends: 67 [2020-08-19 06:56:53,561 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=461, Unknown=0, NotChecked=0, Total=506 [2020-08-19 06:56:53,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-08-19 06:56:53,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2020-08-19 06:56:53,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-19 06:56:53,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 86 transitions. [2020-08-19 06:56:53,568 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 86 transitions. Word has length 63 [2020-08-19 06:56:53,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:53,568 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 86 transitions. [2020-08-19 06:56:53,568 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-19 06:56:53,569 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 86 transitions. [2020-08-19 06:56:53,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-19 06:56:53,569 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:53,569 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:53,570 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-19 06:56:53,570 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:53,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:53,570 INFO L82 PathProgramCache]: Analyzing trace with hash 796345362, now seen corresponding path program 18 times [2020-08-19 06:56:53,570 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:53,571 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2063233920] [2020-08-19 06:56:53,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:53,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:53,908 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:53,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:53,917 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 0 proven. 513 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:53,917 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2063233920] [2020-08-19 06:56:53,917 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:53,918 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-19 06:56:53,918 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1729554365] [2020-08-19 06:56:53,918 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-19 06:56:53,918 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:53,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-19 06:56:53,919 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-08-19 06:56:53,919 INFO L87 Difference]: Start difference. First operand 67 states and 86 transitions. Second operand 23 states. [2020-08-19 06:56:54,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:54,453 INFO L93 Difference]: Finished difference Result 75 states and 95 transitions. [2020-08-19 06:56:54,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-19 06:56:54,454 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 66 [2020-08-19 06:56:54,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:54,455 INFO L225 Difference]: With dead ends: 75 [2020-08-19 06:56:54,455 INFO L226 Difference]: Without dead ends: 70 [2020-08-19 06:56:54,456 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=47, Invalid=505, Unknown=0, NotChecked=0, Total=552 [2020-08-19 06:56:54,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-19 06:56:54,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2020-08-19 06:56:54,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-08-19 06:56:54,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 90 transitions. [2020-08-19 06:56:54,463 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 90 transitions. Word has length 66 [2020-08-19 06:56:54,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:54,464 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 90 transitions. [2020-08-19 06:56:54,464 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-19 06:56:54,464 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 90 transitions. [2020-08-19 06:56:54,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-19 06:56:54,464 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:54,465 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:54,465 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-19 06:56:54,465 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:54,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:54,465 INFO L82 PathProgramCache]: Analyzing trace with hash -1947047543, now seen corresponding path program 19 times [2020-08-19 06:56:54,466 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:54,466 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [816367045] [2020-08-19 06:56:54,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:54,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:54,861 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:54,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:54,870 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 570 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:54,871 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [816367045] [2020-08-19 06:56:54,871 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:54,871 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-19 06:56:54,871 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1426060271] [2020-08-19 06:56:54,872 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-19 06:56:54,872 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:54,872 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-19 06:56:54,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2020-08-19 06:56:54,873 INFO L87 Difference]: Start difference. First operand 70 states and 90 transitions. Second operand 24 states. [2020-08-19 06:56:55,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:55,457 INFO L93 Difference]: Finished difference Result 78 states and 99 transitions. [2020-08-19 06:56:55,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-19 06:56:55,458 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 69 [2020-08-19 06:56:55,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:55,459 INFO L225 Difference]: With dead ends: 78 [2020-08-19 06:56:55,459 INFO L226 Difference]: Without dead ends: 73 [2020-08-19 06:56:55,460 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=49, Invalid=551, Unknown=0, NotChecked=0, Total=600 [2020-08-19 06:56:55,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-19 06:56:55,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2020-08-19 06:56:55,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-19 06:56:55,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 94 transitions. [2020-08-19 06:56:55,468 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 94 transitions. Word has length 69 [2020-08-19 06:56:55,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:55,468 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 94 transitions. [2020-08-19 06:56:55,468 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-19 06:56:55,468 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 94 transitions. [2020-08-19 06:56:55,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-19 06:56:55,469 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:55,469 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:55,469 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-19 06:56:55,469 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:55,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:55,470 INFO L82 PathProgramCache]: Analyzing trace with hash -1432404814, now seen corresponding path program 20 times [2020-08-19 06:56:55,470 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:55,470 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [689626555] [2020-08-19 06:56:55,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:55,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:55,874 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:55,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:55,883 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:55,884 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [689626555] [2020-08-19 06:56:55,884 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:55,884 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-19 06:56:55,884 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1030907646] [2020-08-19 06:56:55,885 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-19 06:56:55,885 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:55,885 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-19 06:56:55,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-08-19 06:56:55,885 INFO L87 Difference]: Start difference. First operand 73 states and 94 transitions. Second operand 25 states. [2020-08-19 06:56:56,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:56,588 INFO L93 Difference]: Finished difference Result 81 states and 103 transitions. [2020-08-19 06:56:56,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-19 06:56:56,591 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 72 [2020-08-19 06:56:56,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:56,592 INFO L225 Difference]: With dead ends: 81 [2020-08-19 06:56:56,592 INFO L226 Difference]: Without dead ends: 76 [2020-08-19 06:56:56,593 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=51, Invalid=599, Unknown=0, NotChecked=0, Total=650 [2020-08-19 06:56:56,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-19 06:56:56,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2020-08-19 06:56:56,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-08-19 06:56:56,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 98 transitions. [2020-08-19 06:56:56,602 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 98 transitions. Word has length 72 [2020-08-19 06:56:56,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:56,603 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 98 transitions. [2020-08-19 06:56:56,603 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-19 06:56:56,603 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 98 transitions. [2020-08-19 06:56:56,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-08-19 06:56:56,604 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:56,605 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:56,605 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-19 06:56:56,605 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:56,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:56,606 INFO L82 PathProgramCache]: Analyzing trace with hash 1550855401, now seen corresponding path program 21 times [2020-08-19 06:56:56,606 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:56,606 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1793575282] [2020-08-19 06:56:56,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:56,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:57,066 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:57,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:57,075 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 0 proven. 693 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:57,076 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1793575282] [2020-08-19 06:56:57,076 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:57,076 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-19 06:56:57,076 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [406314666] [2020-08-19 06:56:57,077 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-19 06:56:57,077 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:57,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-19 06:56:57,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=601, Unknown=0, NotChecked=0, Total=650 [2020-08-19 06:56:57,077 INFO L87 Difference]: Start difference. First operand 76 states and 98 transitions. Second operand 26 states. [2020-08-19 06:56:57,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:57,759 INFO L93 Difference]: Finished difference Result 84 states and 107 transitions. [2020-08-19 06:56:57,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-19 06:56:57,760 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 75 [2020-08-19 06:56:57,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:57,761 INFO L225 Difference]: With dead ends: 84 [2020-08-19 06:56:57,762 INFO L226 Difference]: Without dead ends: 79 [2020-08-19 06:56:57,763 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=53, Invalid=649, Unknown=0, NotChecked=0, Total=702 [2020-08-19 06:56:57,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-08-19 06:56:57,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2020-08-19 06:56:57,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-19 06:56:57,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 102 transitions. [2020-08-19 06:56:57,769 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 102 transitions. Word has length 75 [2020-08-19 06:56:57,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:57,770 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 102 transitions. [2020-08-19 06:56:57,770 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-19 06:56:57,770 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 102 transitions. [2020-08-19 06:56:57,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-19 06:56:57,771 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:57,771 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:57,771 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-19 06:56:57,771 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:57,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:57,772 INFO L82 PathProgramCache]: Analyzing trace with hash 97664338, now seen corresponding path program 22 times [2020-08-19 06:56:57,772 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:57,772 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1741191251] [2020-08-19 06:56:57,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:57,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:58,357 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:58,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:58,390 INFO L134 CoverageAnalysis]: Checked inductivity of 759 backedges. 0 proven. 759 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:58,391 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1741191251] [2020-08-19 06:56:58,391 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:58,391 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-19 06:56:58,391 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1933128704] [2020-08-19 06:56:58,392 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-19 06:56:58,392 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:58,392 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-19 06:56:58,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2020-08-19 06:56:58,393 INFO L87 Difference]: Start difference. First operand 79 states and 102 transitions. Second operand 27 states. [2020-08-19 06:56:59,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:56:59,139 INFO L93 Difference]: Finished difference Result 87 states and 111 transitions. [2020-08-19 06:56:59,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-19 06:56:59,140 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 78 [2020-08-19 06:56:59,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:56:59,141 INFO L225 Difference]: With dead ends: 87 [2020-08-19 06:56:59,141 INFO L226 Difference]: Without dead ends: 82 [2020-08-19 06:56:59,141 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=55, Invalid=701, Unknown=0, NotChecked=0, Total=756 [2020-08-19 06:56:59,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-19 06:56:59,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2020-08-19 06:56:59,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-08-19 06:56:59,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 106 transitions. [2020-08-19 06:56:59,149 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 106 transitions. Word has length 78 [2020-08-19 06:56:59,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:56:59,150 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 106 transitions. [2020-08-19 06:56:59,150 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-19 06:56:59,150 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 106 transitions. [2020-08-19 06:56:59,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-08-19 06:56:59,151 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:56:59,151 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:56:59,152 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-19 06:56:59,154 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:56:59,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:56:59,155 INFO L82 PathProgramCache]: Analyzing trace with hash 1353050185, now seen corresponding path program 23 times [2020-08-19 06:56:59,155 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:56:59,155 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1548998735] [2020-08-19 06:56:59,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:56:59,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:59,639 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:56:59,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:56:59,656 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 0 proven. 828 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:56:59,656 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1548998735] [2020-08-19 06:56:59,656 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:56:59,656 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-19 06:56:59,657 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [809260461] [2020-08-19 06:56:59,657 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-19 06:56:59,657 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:56:59,657 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-19 06:56:59,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=703, Unknown=0, NotChecked=0, Total=756 [2020-08-19 06:56:59,658 INFO L87 Difference]: Start difference. First operand 82 states and 106 transitions. Second operand 28 states. [2020-08-19 06:57:00,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:57:00,453 INFO L93 Difference]: Finished difference Result 90 states and 115 transitions. [2020-08-19 06:57:00,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-19 06:57:00,454 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 81 [2020-08-19 06:57:00,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:57:00,455 INFO L225 Difference]: With dead ends: 90 [2020-08-19 06:57:00,455 INFO L226 Difference]: Without dead ends: 85 [2020-08-19 06:57:00,456 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=57, Invalid=755, Unknown=0, NotChecked=0, Total=812 [2020-08-19 06:57:00,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-08-19 06:57:00,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2020-08-19 06:57:00,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-19 06:57:00,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 110 transitions. [2020-08-19 06:57:00,462 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 110 transitions. Word has length 81 [2020-08-19 06:57:00,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:57:00,462 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 110 transitions. [2020-08-19 06:57:00,463 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-19 06:57:00,463 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 110 transitions. [2020-08-19 06:57:00,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-19 06:57:00,463 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:57:00,464 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:57:00,464 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-19 06:57:00,464 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:57:00,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:57:00,464 INFO L82 PathProgramCache]: Analyzing trace with hash -22395406, now seen corresponding path program 24 times [2020-08-19 06:57:00,464 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:57:00,465 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [288163886] [2020-08-19 06:57:00,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:57:00,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:01,154 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:57:01,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:01,184 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:57:01,184 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [288163886] [2020-08-19 06:57:01,184 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:57:01,185 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-19 06:57:01,185 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [565253874] [2020-08-19 06:57:01,187 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-19 06:57:01,187 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:57:01,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-19 06:57:01,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=757, Unknown=0, NotChecked=0, Total=812 [2020-08-19 06:57:01,189 INFO L87 Difference]: Start difference. First operand 85 states and 110 transitions. Second operand 29 states. [2020-08-19 06:57:02,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:57:02,161 INFO L93 Difference]: Finished difference Result 93 states and 119 transitions. [2020-08-19 06:57:02,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-19 06:57:02,162 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 84 [2020-08-19 06:57:02,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:57:02,163 INFO L225 Difference]: With dead ends: 93 [2020-08-19 06:57:02,164 INFO L226 Difference]: Without dead ends: 88 [2020-08-19 06:57:02,165 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=59, Invalid=811, Unknown=0, NotChecked=0, Total=870 [2020-08-19 06:57:02,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-19 06:57:02,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2020-08-19 06:57:02,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-08-19 06:57:02,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 114 transitions. [2020-08-19 06:57:02,173 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 114 transitions. Word has length 84 [2020-08-19 06:57:02,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:57:02,173 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 114 transitions. [2020-08-19 06:57:02,173 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-19 06:57:02,173 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 114 transitions. [2020-08-19 06:57:02,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-08-19 06:57:02,174 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:57:02,174 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:57:02,175 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-19 06:57:02,175 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:57:02,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:57:02,176 INFO L82 PathProgramCache]: Analyzing trace with hash -1933993047, now seen corresponding path program 25 times [2020-08-19 06:57:02,176 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:57:02,176 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1670166156] [2020-08-19 06:57:02,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:57:02,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:02,872 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:57:02,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:02,898 INFO L134 CoverageAnalysis]: Checked inductivity of 975 backedges. 0 proven. 975 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:57:02,898 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1670166156] [2020-08-19 06:57:02,899 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:57:02,900 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-19 06:57:02,900 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1479649933] [2020-08-19 06:57:02,901 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-19 06:57:02,901 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:57:02,901 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-19 06:57:02,902 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=813, Unknown=0, NotChecked=0, Total=870 [2020-08-19 06:57:02,902 INFO L87 Difference]: Start difference. First operand 88 states and 114 transitions. Second operand 30 states. [2020-08-19 06:57:03,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:57:03,919 INFO L93 Difference]: Finished difference Result 96 states and 123 transitions. [2020-08-19 06:57:03,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-19 06:57:03,919 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 87 [2020-08-19 06:57:03,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:57:03,921 INFO L225 Difference]: With dead ends: 96 [2020-08-19 06:57:03,921 INFO L226 Difference]: Without dead ends: 91 [2020-08-19 06:57:03,922 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=61, Invalid=869, Unknown=0, NotChecked=0, Total=930 [2020-08-19 06:57:03,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-19 06:57:03,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2020-08-19 06:57:03,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-19 06:57:03,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 118 transitions. [2020-08-19 06:57:03,930 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 118 transitions. Word has length 87 [2020-08-19 06:57:03,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:57:03,930 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 118 transitions. [2020-08-19 06:57:03,930 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-19 06:57:03,930 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 118 transitions. [2020-08-19 06:57:03,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-19 06:57:03,931 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:57:03,931 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:57:03,931 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-19 06:57:03,931 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:57:03,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:57:03,932 INFO L82 PathProgramCache]: Analyzing trace with hash 927028882, now seen corresponding path program 26 times [2020-08-19 06:57:03,932 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:57:03,932 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2012289706] [2020-08-19 06:57:03,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:57:03,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:04,578 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:57:04,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:04,591 INFO L134 CoverageAnalysis]: Checked inductivity of 1053 backedges. 0 proven. 1053 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:57:04,592 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2012289706] [2020-08-19 06:57:04,592 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:57:04,592 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-19 06:57:04,592 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1603109857] [2020-08-19 06:57:04,593 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-19 06:57:04,593 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:57:04,593 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-19 06:57:04,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=871, Unknown=0, NotChecked=0, Total=930 [2020-08-19 06:57:04,594 INFO L87 Difference]: Start difference. First operand 91 states and 118 transitions. Second operand 31 states. [2020-08-19 06:57:05,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:57:05,629 INFO L93 Difference]: Finished difference Result 99 states and 127 transitions. [2020-08-19 06:57:05,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-19 06:57:05,630 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 90 [2020-08-19 06:57:05,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:57:05,631 INFO L225 Difference]: With dead ends: 99 [2020-08-19 06:57:05,631 INFO L226 Difference]: Without dead ends: 94 [2020-08-19 06:57:05,632 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=63, Invalid=929, Unknown=0, NotChecked=0, Total=992 [2020-08-19 06:57:05,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-19 06:57:05,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2020-08-19 06:57:05,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2020-08-19 06:57:05,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 122 transitions. [2020-08-19 06:57:05,639 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 122 transitions. Word has length 90 [2020-08-19 06:57:05,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:57:05,639 INFO L479 AbstractCegarLoop]: Abstraction has 94 states and 122 transitions. [2020-08-19 06:57:05,639 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-19 06:57:05,639 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 122 transitions. [2020-08-19 06:57:05,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-08-19 06:57:05,640 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:57:05,640 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:57:05,641 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-19 06:57:05,641 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:57:05,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:57:05,641 INFO L82 PathProgramCache]: Analyzing trace with hash 5326601, now seen corresponding path program 27 times [2020-08-19 06:57:05,641 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:57:05,641 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [87884221] [2020-08-19 06:57:05,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:57:05,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:06,324 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:57:06,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:06,338 INFO L134 CoverageAnalysis]: Checked inductivity of 1134 backedges. 0 proven. 1134 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:57:06,339 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [87884221] [2020-08-19 06:57:06,339 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:57:06,339 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-19 06:57:06,339 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1951483824] [2020-08-19 06:57:06,339 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-19 06:57:06,340 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:57:06,340 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-19 06:57:06,340 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=931, Unknown=0, NotChecked=0, Total=992 [2020-08-19 06:57:06,340 INFO L87 Difference]: Start difference. First operand 94 states and 122 transitions. Second operand 32 states. [2020-08-19 06:57:07,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:57:07,466 INFO L93 Difference]: Finished difference Result 102 states and 131 transitions. [2020-08-19 06:57:07,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-19 06:57:07,467 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 93 [2020-08-19 06:57:07,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:57:07,469 INFO L225 Difference]: With dead ends: 102 [2020-08-19 06:57:07,469 INFO L226 Difference]: Without dead ends: 97 [2020-08-19 06:57:07,470 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=65, Invalid=991, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 06:57:07,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-08-19 06:57:07,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2020-08-19 06:57:07,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-19 06:57:07,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 126 transitions. [2020-08-19 06:57:07,478 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 126 transitions. Word has length 93 [2020-08-19 06:57:07,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:57:07,478 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 126 transitions. [2020-08-19 06:57:07,478 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-19 06:57:07,478 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 126 transitions. [2020-08-19 06:57:07,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-19 06:57:07,479 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:57:07,479 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:57:07,479 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-19 06:57:07,479 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:57:07,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:57:07,480 INFO L82 PathProgramCache]: Analyzing trace with hash -701403342, now seen corresponding path program 28 times [2020-08-19 06:57:07,480 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:57:07,480 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1652324075] [2020-08-19 06:57:07,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:57:07,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:08,206 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:57:08,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:08,220 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 0 proven. 1218 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:57:08,221 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1652324075] [2020-08-19 06:57:08,221 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:57:08,221 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-19 06:57:08,221 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1407373979] [2020-08-19 06:57:08,222 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-19 06:57:08,222 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:57:08,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-19 06:57:08,222 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=993, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 06:57:08,223 INFO L87 Difference]: Start difference. First operand 97 states and 126 transitions. Second operand 33 states. [2020-08-19 06:57:09,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:57:09,410 INFO L93 Difference]: Finished difference Result 105 states and 135 transitions. [2020-08-19 06:57:09,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-19 06:57:09,410 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 96 [2020-08-19 06:57:09,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:57:09,411 INFO L225 Difference]: With dead ends: 105 [2020-08-19 06:57:09,411 INFO L226 Difference]: Without dead ends: 100 [2020-08-19 06:57:09,412 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=67, Invalid=1055, Unknown=0, NotChecked=0, Total=1122 [2020-08-19 06:57:09,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-19 06:57:09,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2020-08-19 06:57:09,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-08-19 06:57:09,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 130 transitions. [2020-08-19 06:57:09,421 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 130 transitions. Word has length 96 [2020-08-19 06:57:09,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:57:09,421 INFO L479 AbstractCegarLoop]: Abstraction has 100 states and 130 transitions. [2020-08-19 06:57:09,421 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-19 06:57:09,421 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 130 transitions. [2020-08-19 06:57:09,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2020-08-19 06:57:09,422 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:57:09,422 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:57:09,422 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-19 06:57:09,423 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:57:09,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:57:09,423 INFO L82 PathProgramCache]: Analyzing trace with hash -963450263, now seen corresponding path program 29 times [2020-08-19 06:57:09,423 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:57:09,423 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1375291523] [2020-08-19 06:57:09,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:57:09,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:10,214 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:57:10,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:10,237 INFO L134 CoverageAnalysis]: Checked inductivity of 1305 backedges. 0 proven. 1305 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:57:10,238 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1375291523] [2020-08-19 06:57:10,238 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:57:10,238 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-19 06:57:10,238 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1002959062] [2020-08-19 06:57:10,239 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-19 06:57:10,239 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:57:10,239 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-19 06:57:10,239 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=1057, Unknown=0, NotChecked=0, Total=1122 [2020-08-19 06:57:10,240 INFO L87 Difference]: Start difference. First operand 100 states and 130 transitions. Second operand 34 states. [2020-08-19 06:57:11,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:57:11,473 INFO L93 Difference]: Finished difference Result 108 states and 139 transitions. [2020-08-19 06:57:11,473 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-19 06:57:11,474 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 99 [2020-08-19 06:57:11,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:57:11,475 INFO L225 Difference]: With dead ends: 108 [2020-08-19 06:57:11,475 INFO L226 Difference]: Without dead ends: 103 [2020-08-19 06:57:11,477 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=69, Invalid=1121, Unknown=0, NotChecked=0, Total=1190 [2020-08-19 06:57:11,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-08-19 06:57:11,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2020-08-19 06:57:11,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-19 06:57:11,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 134 transitions. [2020-08-19 06:57:11,493 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 134 transitions. Word has length 99 [2020-08-19 06:57:11,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:57:11,493 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 134 transitions. [2020-08-19 06:57:11,493 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-19 06:57:11,493 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 134 transitions. [2020-08-19 06:57:11,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-19 06:57:11,494 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:57:11,494 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:57:11,495 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-19 06:57:11,495 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:57:11,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:57:11,495 INFO L82 PathProgramCache]: Analyzing trace with hash 647270354, now seen corresponding path program 30 times [2020-08-19 06:57:11,495 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:57:11,496 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [739507724] [2020-08-19 06:57:11,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:57:11,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:12,327 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:57:12,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:12,344 INFO L134 CoverageAnalysis]: Checked inductivity of 1395 backedges. 0 proven. 1395 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:57:12,344 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [739507724] [2020-08-19 06:57:12,344 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:57:12,344 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-19 06:57:12,345 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1068462165] [2020-08-19 06:57:12,345 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-19 06:57:12,345 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:57:12,345 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-19 06:57:12,346 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2020-08-19 06:57:12,346 INFO L87 Difference]: Start difference. First operand 103 states and 134 transitions. Second operand 35 states. [2020-08-19 06:57:13,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:57:13,691 INFO L93 Difference]: Finished difference Result 111 states and 143 transitions. [2020-08-19 06:57:13,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-19 06:57:13,698 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 102 [2020-08-19 06:57:13,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:57:13,699 INFO L225 Difference]: With dead ends: 111 [2020-08-19 06:57:13,700 INFO L226 Difference]: Without dead ends: 106 [2020-08-19 06:57:13,700 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=71, Invalid=1189, Unknown=0, NotChecked=0, Total=1260 [2020-08-19 06:57:13,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-19 06:57:13,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2020-08-19 06:57:13,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-08-19 06:57:13,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 138 transitions. [2020-08-19 06:57:13,709 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 138 transitions. Word has length 102 [2020-08-19 06:57:13,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:57:13,709 INFO L479 AbstractCegarLoop]: Abstraction has 106 states and 138 transitions. [2020-08-19 06:57:13,709 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-19 06:57:13,709 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 138 transitions. [2020-08-19 06:57:13,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2020-08-19 06:57:13,710 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:57:13,710 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:57:13,710 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-19 06:57:13,711 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:57:13,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:57:13,711 INFO L82 PathProgramCache]: Analyzing trace with hash -2044426807, now seen corresponding path program 31 times [2020-08-19 06:57:13,711 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:57:13,711 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [360159883] [2020-08-19 06:57:13,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:57:13,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:14,561 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:57:14,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:14,578 INFO L134 CoverageAnalysis]: Checked inductivity of 1488 backedges. 0 proven. 1488 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:57:14,579 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [360159883] [2020-08-19 06:57:14,579 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:57:14,579 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-19 06:57:14,579 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [383852411] [2020-08-19 06:57:14,579 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-19 06:57:14,579 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:57:14,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-19 06:57:14,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=1191, Unknown=0, NotChecked=0, Total=1260 [2020-08-19 06:57:14,580 INFO L87 Difference]: Start difference. First operand 106 states and 138 transitions. Second operand 36 states. [2020-08-19 06:57:16,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:57:16,052 INFO L93 Difference]: Finished difference Result 114 states and 147 transitions. [2020-08-19 06:57:16,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-19 06:57:16,055 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 105 [2020-08-19 06:57:16,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:57:16,056 INFO L225 Difference]: With dead ends: 114 [2020-08-19 06:57:16,056 INFO L226 Difference]: Without dead ends: 109 [2020-08-19 06:57:16,057 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=73, Invalid=1259, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 06:57:16,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2020-08-19 06:57:16,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2020-08-19 06:57:16,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-08-19 06:57:16,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 142 transitions. [2020-08-19 06:57:16,066 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 142 transitions. Word has length 105 [2020-08-19 06:57:16,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:57:16,066 INFO L479 AbstractCegarLoop]: Abstraction has 109 states and 142 transitions. [2020-08-19 06:57:16,066 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-19 06:57:16,066 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 142 transitions. [2020-08-19 06:57:16,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-08-19 06:57:16,067 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:57:16,067 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:57:16,068 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-19 06:57:16,068 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:57:16,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:57:16,068 INFO L82 PathProgramCache]: Analyzing trace with hash 939833458, now seen corresponding path program 32 times [2020-08-19 06:57:16,068 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:57:16,069 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [733341025] [2020-08-19 06:57:16,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:57:16,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:16,985 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:57:16,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:17,003 INFO L134 CoverageAnalysis]: Checked inductivity of 1584 backedges. 0 proven. 1584 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:57:17,003 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [733341025] [2020-08-19 06:57:17,003 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:57:17,003 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-19 06:57:17,003 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1413322388] [2020-08-19 06:57:17,004 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-19 06:57:17,004 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:57:17,004 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-19 06:57:17,004 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=1261, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 06:57:17,004 INFO L87 Difference]: Start difference. First operand 109 states and 142 transitions. Second operand 37 states. [2020-08-19 06:57:18,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:57:18,493 INFO L93 Difference]: Finished difference Result 117 states and 151 transitions. [2020-08-19 06:57:18,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-19 06:57:18,493 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 108 [2020-08-19 06:57:18,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:57:18,495 INFO L225 Difference]: With dead ends: 117 [2020-08-19 06:57:18,495 INFO L226 Difference]: Without dead ends: 112 [2020-08-19 06:57:18,496 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=75, Invalid=1331, Unknown=0, NotChecked=0, Total=1406 [2020-08-19 06:57:18,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-08-19 06:57:18,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 112. [2020-08-19 06:57:18,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2020-08-19 06:57:18,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 146 transitions. [2020-08-19 06:57:18,507 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 146 transitions. Word has length 108 [2020-08-19 06:57:18,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:57:18,507 INFO L479 AbstractCegarLoop]: Abstraction has 112 states and 146 transitions. [2020-08-19 06:57:18,507 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-19 06:57:18,507 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 146 transitions. [2020-08-19 06:57:18,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2020-08-19 06:57:18,508 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:57:18,508 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:57:18,509 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-19 06:57:18,509 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:57:18,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:57:18,509 INFO L82 PathProgramCache]: Analyzing trace with hash -785639127, now seen corresponding path program 33 times [2020-08-19 06:57:18,512 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:57:18,516 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1635323093] [2020-08-19 06:57:18,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:57:18,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:19,457 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:57:19,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:19,477 INFO L134 CoverageAnalysis]: Checked inductivity of 1683 backedges. 0 proven. 1683 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:57:19,478 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1635323093] [2020-08-19 06:57:19,478 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:57:19,478 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-19 06:57:19,478 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [968459931] [2020-08-19 06:57:19,479 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-19 06:57:19,479 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:57:19,479 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-19 06:57:19,480 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=1333, Unknown=0, NotChecked=0, Total=1406 [2020-08-19 06:57:19,480 INFO L87 Difference]: Start difference. First operand 112 states and 146 transitions. Second operand 38 states. [2020-08-19 06:57:21,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:57:21,102 INFO L93 Difference]: Finished difference Result 120 states and 155 transitions. [2020-08-19 06:57:21,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-19 06:57:21,103 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 111 [2020-08-19 06:57:21,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:57:21,105 INFO L225 Difference]: With dead ends: 120 [2020-08-19 06:57:21,105 INFO L226 Difference]: Without dead ends: 115 [2020-08-19 06:57:21,105 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=77, Invalid=1405, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 06:57:21,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2020-08-19 06:57:21,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2020-08-19 06:57:21,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2020-08-19 06:57:21,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 150 transitions. [2020-08-19 06:57:21,114 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 150 transitions. Word has length 111 [2020-08-19 06:57:21,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:57:21,115 INFO L479 AbstractCegarLoop]: Abstraction has 115 states and 150 transitions. [2020-08-19 06:57:21,115 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-19 06:57:21,115 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 150 transitions. [2020-08-19 06:57:21,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2020-08-19 06:57:21,116 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:57:21,116 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:57:21,116 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-19 06:57:21,116 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:57:21,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:57:21,117 INFO L82 PathProgramCache]: Analyzing trace with hash 2124146962, now seen corresponding path program 34 times [2020-08-19 06:57:21,117 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:57:21,117 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1508687755] [2020-08-19 06:57:21,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:57:21,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:22,126 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:57:22,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:22,152 INFO L134 CoverageAnalysis]: Checked inductivity of 1785 backedges. 0 proven. 1785 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:57:22,153 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1508687755] [2020-08-19 06:57:22,153 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:57:22,153 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-19 06:57:22,153 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [596955501] [2020-08-19 06:57:22,154 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-19 06:57:22,154 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:57:22,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-19 06:57:22,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=1407, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 06:57:22,155 INFO L87 Difference]: Start difference. First operand 115 states and 150 transitions. Second operand 39 states. [2020-08-19 06:57:23,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:57:23,892 INFO L93 Difference]: Finished difference Result 123 states and 159 transitions. [2020-08-19 06:57:23,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-19 06:57:23,893 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 114 [2020-08-19 06:57:23,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:57:23,895 INFO L225 Difference]: With dead ends: 123 [2020-08-19 06:57:23,895 INFO L226 Difference]: Without dead ends: 118 [2020-08-19 06:57:23,896 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=79, Invalid=1481, Unknown=0, NotChecked=0, Total=1560 [2020-08-19 06:57:23,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-08-19 06:57:23,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2020-08-19 06:57:23,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2020-08-19 06:57:23,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 154 transitions. [2020-08-19 06:57:23,907 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 154 transitions. Word has length 114 [2020-08-19 06:57:23,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:57:23,907 INFO L479 AbstractCegarLoop]: Abstraction has 118 states and 154 transitions. [2020-08-19 06:57:23,907 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-19 06:57:23,908 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 154 transitions. [2020-08-19 06:57:23,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-08-19 06:57:23,908 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:57:23,909 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:57:23,909 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-19 06:57:23,909 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:57:23,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:57:23,910 INFO L82 PathProgramCache]: Analyzing trace with hash -2058378103, now seen corresponding path program 35 times [2020-08-19 06:57:23,910 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:57:23,910 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [676634813] [2020-08-19 06:57:23,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:57:23,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:25,024 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:57:25,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:25,046 INFO L134 CoverageAnalysis]: Checked inductivity of 1890 backedges. 0 proven. 1890 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:57:25,046 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [676634813] [2020-08-19 06:57:25,046 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:57:25,046 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-19 06:57:25,046 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [780392280] [2020-08-19 06:57:25,047 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-19 06:57:25,047 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:57:25,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-19 06:57:25,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=1483, Unknown=0, NotChecked=0, Total=1560 [2020-08-19 06:57:25,048 INFO L87 Difference]: Start difference. First operand 118 states and 154 transitions. Second operand 40 states. [2020-08-19 06:57:26,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:57:26,953 INFO L93 Difference]: Finished difference Result 126 states and 163 transitions. [2020-08-19 06:57:26,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-19 06:57:26,953 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 117 [2020-08-19 06:57:26,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:57:26,957 INFO L225 Difference]: With dead ends: 126 [2020-08-19 06:57:26,957 INFO L226 Difference]: Without dead ends: 121 [2020-08-19 06:57:26,958 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=81, Invalid=1559, Unknown=0, NotChecked=0, Total=1640 [2020-08-19 06:57:26,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2020-08-19 06:57:26,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2020-08-19 06:57:26,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-08-19 06:57:26,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 158 transitions. [2020-08-19 06:57:26,969 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 158 transitions. Word has length 117 [2020-08-19 06:57:26,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:57:26,969 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 158 transitions. [2020-08-19 06:57:26,969 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-19 06:57:26,969 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 158 transitions. [2020-08-19 06:57:26,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-08-19 06:57:26,970 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:57:26,970 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:57:26,970 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-19 06:57:26,970 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:57:26,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:57:26,971 INFO L82 PathProgramCache]: Analyzing trace with hash 1928602034, now seen corresponding path program 36 times [2020-08-19 06:57:26,971 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:57:26,971 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [273648020] [2020-08-19 06:57:26,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:57:26,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:28,229 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:57:28,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:28,250 INFO L134 CoverageAnalysis]: Checked inductivity of 1998 backedges. 0 proven. 1998 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:57:28,251 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [273648020] [2020-08-19 06:57:28,251 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:57:28,251 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-19 06:57:28,251 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1495818153] [2020-08-19 06:57:28,256 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-19 06:57:28,256 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:57:28,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-19 06:57:28,257 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=1561, Unknown=0, NotChecked=0, Total=1640 [2020-08-19 06:57:28,257 INFO L87 Difference]: Start difference. First operand 121 states and 158 transitions. Second operand 41 states. [2020-08-19 06:57:30,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:57:30,280 INFO L93 Difference]: Finished difference Result 129 states and 167 transitions. [2020-08-19 06:57:30,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-19 06:57:30,280 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 120 [2020-08-19 06:57:30,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:57:30,282 INFO L225 Difference]: With dead ends: 129 [2020-08-19 06:57:30,282 INFO L226 Difference]: Without dead ends: 124 [2020-08-19 06:57:30,283 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=83, Invalid=1639, Unknown=0, NotChecked=0, Total=1722 [2020-08-19 06:57:30,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-08-19 06:57:30,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2020-08-19 06:57:30,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2020-08-19 06:57:30,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 162 transitions. [2020-08-19 06:57:30,294 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 162 transitions. Word has length 120 [2020-08-19 06:57:30,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:57:30,294 INFO L479 AbstractCegarLoop]: Abstraction has 124 states and 162 transitions. [2020-08-19 06:57:30,295 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-19 06:57:30,295 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 162 transitions. [2020-08-19 06:57:30,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2020-08-19 06:57:30,295 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:57:30,296 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:57:30,296 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-19 06:57:30,296 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:57:30,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:57:30,296 INFO L82 PathProgramCache]: Analyzing trace with hash 733292521, now seen corresponding path program 37 times [2020-08-19 06:57:30,297 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:57:30,297 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [554753091] [2020-08-19 06:57:30,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:57:30,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:31,573 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:57:31,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:31,594 INFO L134 CoverageAnalysis]: Checked inductivity of 2109 backedges. 0 proven. 2109 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:57:31,594 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [554753091] [2020-08-19 06:57:31,595 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:57:31,595 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-19 06:57:31,595 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1201122720] [2020-08-19 06:57:31,595 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-19 06:57:31,595 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:57:31,596 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-19 06:57:31,596 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=1641, Unknown=0, NotChecked=0, Total=1722 [2020-08-19 06:57:31,596 INFO L87 Difference]: Start difference. First operand 124 states and 162 transitions. Second operand 42 states. [2020-08-19 06:57:33,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:57:33,712 INFO L93 Difference]: Finished difference Result 132 states and 171 transitions. [2020-08-19 06:57:33,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-19 06:57:33,719 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 123 [2020-08-19 06:57:33,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:57:33,720 INFO L225 Difference]: With dead ends: 132 [2020-08-19 06:57:33,720 INFO L226 Difference]: Without dead ends: 127 [2020-08-19 06:57:33,721 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=85, Invalid=1721, Unknown=0, NotChecked=0, Total=1806 [2020-08-19 06:57:33,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2020-08-19 06:57:33,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2020-08-19 06:57:33,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2020-08-19 06:57:33,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 166 transitions. [2020-08-19 06:57:33,733 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 166 transitions. Word has length 123 [2020-08-19 06:57:33,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:57:33,733 INFO L479 AbstractCegarLoop]: Abstraction has 127 states and 166 transitions. [2020-08-19 06:57:33,734 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-19 06:57:33,734 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 166 transitions. [2020-08-19 06:57:33,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2020-08-19 06:57:33,734 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:57:33,735 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:57:33,735 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-19 06:57:33,735 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:57:33,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:57:33,735 INFO L82 PathProgramCache]: Analyzing trace with hash 841441874, now seen corresponding path program 38 times [2020-08-19 06:57:33,736 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:57:33,736 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1235572094] [2020-08-19 06:57:33,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:57:33,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:34,982 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:57:34,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:35,006 INFO L134 CoverageAnalysis]: Checked inductivity of 2223 backedges. 0 proven. 2223 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:57:35,006 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1235572094] [2020-08-19 06:57:35,006 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:57:35,006 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-19 06:57:35,006 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2115831724] [2020-08-19 06:57:35,007 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-19 06:57:35,007 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:57:35,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-19 06:57:35,008 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=1723, Unknown=0, NotChecked=0, Total=1806 [2020-08-19 06:57:35,008 INFO L87 Difference]: Start difference. First operand 127 states and 166 transitions. Second operand 43 states. [2020-08-19 06:57:37,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:57:37,249 INFO L93 Difference]: Finished difference Result 135 states and 175 transitions. [2020-08-19 06:57:37,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-19 06:57:37,250 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 126 [2020-08-19 06:57:37,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:57:37,251 INFO L225 Difference]: With dead ends: 135 [2020-08-19 06:57:37,251 INFO L226 Difference]: Without dead ends: 130 [2020-08-19 06:57:37,253 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=87, Invalid=1805, Unknown=0, NotChecked=0, Total=1892 [2020-08-19 06:57:37,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-08-19 06:57:37,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 130. [2020-08-19 06:57:37,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2020-08-19 06:57:37,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 170 transitions. [2020-08-19 06:57:37,264 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 170 transitions. Word has length 126 [2020-08-19 06:57:37,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:57:37,264 INFO L479 AbstractCegarLoop]: Abstraction has 130 states and 170 transitions. [2020-08-19 06:57:37,264 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-19 06:57:37,264 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 170 transitions. [2020-08-19 06:57:37,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2020-08-19 06:57:37,265 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:57:37,265 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:57:37,265 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-19 06:57:37,265 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:57:37,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:57:37,266 INFO L82 PathProgramCache]: Analyzing trace with hash 1493345097, now seen corresponding path program 39 times [2020-08-19 06:57:37,266 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:57:37,266 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1681432782] [2020-08-19 06:57:37,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:57:37,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:38,639 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:57:38,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:38,665 INFO L134 CoverageAnalysis]: Checked inductivity of 2340 backedges. 0 proven. 2340 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:57:38,665 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1681432782] [2020-08-19 06:57:38,666 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:57:38,666 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-19 06:57:38,666 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [532201563] [2020-08-19 06:57:38,666 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-19 06:57:38,666 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:57:38,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-19 06:57:38,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=1807, Unknown=0, NotChecked=0, Total=1892 [2020-08-19 06:57:38,667 INFO L87 Difference]: Start difference. First operand 130 states and 170 transitions. Second operand 44 states. [2020-08-19 06:57:41,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:57:41,076 INFO L93 Difference]: Finished difference Result 138 states and 179 transitions. [2020-08-19 06:57:41,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-19 06:57:41,076 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 129 [2020-08-19 06:57:41,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:57:41,078 INFO L225 Difference]: With dead ends: 138 [2020-08-19 06:57:41,079 INFO L226 Difference]: Without dead ends: 133 [2020-08-19 06:57:41,080 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=89, Invalid=1891, Unknown=0, NotChecked=0, Total=1980 [2020-08-19 06:57:41,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-08-19 06:57:41,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2020-08-19 06:57:41,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2020-08-19 06:57:41,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 174 transitions. [2020-08-19 06:57:41,093 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 174 transitions. Word has length 129 [2020-08-19 06:57:41,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:57:41,093 INFO L479 AbstractCegarLoop]: Abstraction has 133 states and 174 transitions. [2020-08-19 06:57:41,093 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-19 06:57:41,094 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 174 transitions. [2020-08-19 06:57:41,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2020-08-19 06:57:41,094 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:57:41,095 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:57:41,095 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-19 06:57:41,095 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:57:41,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:57:41,095 INFO L82 PathProgramCache]: Analyzing trace with hash 500148978, now seen corresponding path program 40 times [2020-08-19 06:57:41,096 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:57:41,096 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1998293483] [2020-08-19 06:57:41,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:57:41,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:42,486 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:57:42,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:57:42,518 INFO L134 CoverageAnalysis]: Checked inductivity of 2460 backedges. 0 proven. 2460 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:57:42,519 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1998293483] [2020-08-19 06:57:42,519 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:57:42,519 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-19 06:57:42,519 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2147150904] [2020-08-19 06:57:42,519 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-19 06:57:42,520 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:57:42,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-19 06:57:42,521 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=1893, Unknown=0, NotChecked=0, Total=1980 [2020-08-19 06:57:42,521 INFO L87 Difference]: Start difference. First operand 133 states and 174 transitions. Second operand 45 states.