/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=WIDEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/ldv-regression/test25-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 22:44:25,611 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 22:44:25,614 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 22:44:25,653 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-08-18 22:44:25,678 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 22:44:25,681 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 22:44:25,683 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 22:44:25,684 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 22:44:25,686 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 22:44:25,687 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 22:44:25,688 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 22:44:25,694 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 22:44:25,695 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 22:44:25,696 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 22:44:25,697 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 22:44:25,698 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 22:44:25,702 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 22:44:25,710 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 22:44:25,711 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 22:44:25,712 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 22:44:25,713 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-18 22:44:25,752 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 22:44:25,752 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 22:44:25,754 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 22:44:25,754 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 22:44:25,754 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 22:44:25,755 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 22:44:25,755 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 22:44:25,755 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 22:44:25,755 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 22:44:25,755 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 22:44:25,756 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 22:44:25,757 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 22:44:25,757 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 22:44:25,757 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 22:44:25,757 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 22:44:25,758 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 22:44:25,758 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 22:44:25,758 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 22:44:25,758 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 22:44:25,758 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 22:44:25,758 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 22:44:25,759 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 22:44:25,759 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 22:44:25,759 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 22:44:25,759 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 22:44:25,759 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 22:44:25,760 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 22:44:25,760 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 22:44:25,760 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 22:44:25,760 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=WIDEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDEST; [2020-08-18 22:44:26,065 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 22:44:26,077 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 22:44:26,080 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 22:44:26,082 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 22:44:26,082 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 22:44:26,083 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/test25-2.c [2020-08-18 22:44:26,141 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/596f38199/200208ad406c4d368d884ec92fb48d4d/FLAG7563e43a9 [2020-08-18 22:44:26,565 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 22:44:26,565 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/ldv-regression/test25-2.c [2020-08-18 22:44:26,570 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/596f38199/200208ad406c4d368d884ec92fb48d4d/FLAG7563e43a9 [2020-08-18 22:44:26,986 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/596f38199/200208ad406c4d368d884ec92fb48d4d [2020-08-18 22:44:26,995 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 22:44:26,996 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 22:44:26,997 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 22:44:26,997 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 22:44:27,001 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 22:44:27,002 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 10:44:26" (1/1) ... [2020-08-18 22:44:27,004 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7eb74631 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:44:27, skipping insertion in model container [2020-08-18 22:44:27,005 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 10:44:26" (1/1) ... [2020-08-18 22:44:27,012 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 22:44:27,032 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 22:44:27,233 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 22:44:27,242 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 22:44:27,259 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 22:44:27,274 INFO L208 MainTranslator]: Completed translation [2020-08-18 22:44:27,274 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:44:27 WrapperNode [2020-08-18 22:44:27,275 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 22:44:27,275 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 22:44:27,275 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 22:44:27,276 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 22:44:27,377 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:44:27" (1/1) ... [2020-08-18 22:44:27,377 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:44:27" (1/1) ... [2020-08-18 22:44:27,388 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:44:27" (1/1) ... [2020-08-18 22:44:27,389 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:44:27" (1/1) ... [2020-08-18 22:44:27,398 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:44:27" (1/1) ... [2020-08-18 22:44:27,407 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:44:27" (1/1) ... [2020-08-18 22:44:27,414 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:44:27" (1/1) ... [2020-08-18 22:44:27,420 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 22:44:27,420 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 22:44:27,420 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 22:44:27,420 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 22:44:27,421 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:44:27" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 22:44:27,476 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 22:44:27,476 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 22:44:27,476 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2020-08-18 22:44:27,476 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 22:44:27,477 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 22:44:27,477 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-18 22:44:27,477 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-18 22:44:27,477 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-18 22:44:27,477 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-18 22:44:27,477 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 22:44:27,478 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-18 22:44:27,478 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-18 22:44:27,478 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-18 22:44:27,478 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 22:44:27,478 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 22:44:27,479 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 22:44:27,794 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 22:44:27,794 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-08-18 22:44:27,797 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 10:44:27 BoogieIcfgContainer [2020-08-18 22:44:27,798 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 22:44:27,799 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 22:44:27,799 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 22:44:27,802 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 22:44:27,802 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 10:44:26" (1/3) ... [2020-08-18 22:44:27,803 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@78c5ae5e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 10:44:27, skipping insertion in model container [2020-08-18 22:44:27,803 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:44:27" (2/3) ... [2020-08-18 22:44:27,804 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@78c5ae5e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 10:44:27, skipping insertion in model container [2020-08-18 22:44:27,804 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 10:44:27" (3/3) ... [2020-08-18 22:44:27,805 INFO L109 eAbstractionObserver]: Analyzing ICFG test25-2.c [2020-08-18 22:44:27,815 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 22:44:27,822 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 22:44:27,835 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 22:44:27,858 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 22:44:27,858 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 22:44:27,858 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 22:44:27,858 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 22:44:27,858 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 22:44:27,858 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 22:44:27,859 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 22:44:27,859 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 22:44:27,876 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-08-18 22:44:27,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-18 22:44:27,882 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:44:27,883 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:44:27,884 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:44:27,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:44:27,890 INFO L82 PathProgramCache]: Analyzing trace with hash -899836778, now seen corresponding path program 1 times [2020-08-18 22:44:27,898 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:44:27,899 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [9303908] [2020-08-18 22:44:27,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:44:27,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:44:28,090 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:44:28,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:44:28,099 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-18 22:44:28,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:44:28,114 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:44:28,115 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [9303908] [2020-08-18 22:44:28,117 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 22:44:28,117 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 22:44:28,118 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1172228405] [2020-08-18 22:44:28,122 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 22:44:28,123 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:44:28,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 22:44:28,134 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 22:44:28,136 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 3 states. [2020-08-18 22:44:28,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:44:28,228 INFO L93 Difference]: Finished difference Result 42 states and 52 transitions. [2020-08-18 22:44:28,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 22:44:28,230 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-08-18 22:44:28,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:44:28,240 INFO L225 Difference]: With dead ends: 42 [2020-08-18 22:44:28,240 INFO L226 Difference]: Without dead ends: 20 [2020-08-18 22:44:28,244 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 22:44:28,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-18 22:44:28,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-18 22:44:28,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-18 22:44:28,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-08-18 22:44:28,276 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2020-08-18 22:44:28,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:44:28,277 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-08-18 22:44:28,277 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 22:44:28,277 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-08-18 22:44:28,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-18 22:44:28,278 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:44:28,278 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:44:28,279 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 22:44:28,279 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:44:28,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:44:28,280 INFO L82 PathProgramCache]: Analyzing trace with hash -1137678901, now seen corresponding path program 1 times [2020-08-18 22:44:28,280 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:44:28,281 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [965748524] [2020-08-18 22:44:28,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:44:28,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:44:28,354 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:44:28,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:44:28,360 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-18 22:44:28,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:44:28,381 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:44:28,382 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [965748524] [2020-08-18 22:44:28,382 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 22:44:28,382 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 22:44:28,382 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1615180243] [2020-08-18 22:44:28,387 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 22:44:28,387 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:44:28,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 22:44:28,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 22:44:28,390 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 4 states. [2020-08-18 22:44:28,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:44:28,457 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2020-08-18 22:44:28,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 22:44:28,458 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2020-08-18 22:44:28,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:44:28,458 INFO L225 Difference]: With dead ends: 34 [2020-08-18 22:44:28,459 INFO L226 Difference]: Without dead ends: 22 [2020-08-18 22:44:28,460 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 22:44:28,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-18 22:44:28,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-18 22:44:28,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-18 22:44:28,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-18 22:44:28,467 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2020-08-18 22:44:28,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:44:28,467 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-18 22:44:28,467 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 22:44:28,467 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-18 22:44:28,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 22:44:28,468 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:44:28,468 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:44:28,469 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 22:44:28,469 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:44:28,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:44:28,470 INFO L82 PathProgramCache]: Analyzing trace with hash 278779309, now seen corresponding path program 1 times [2020-08-18 22:44:28,470 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:44:28,470 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2019842854] [2020-08-18 22:44:28,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:44:28,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:44:28,568 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:44:28,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:44:28,574 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-08-18 22:44:28,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:44:28,584 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:44:28,589 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2019842854] [2020-08-18 22:44:28,589 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:44:28,589 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 22:44:28,590 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1466007798] [2020-08-18 22:44:28,590 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 22:44:28,590 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:44:28,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 22:44:28,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 22:44:28,594 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 5 states. [2020-08-18 22:44:28,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:44:28,704 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2020-08-18 22:44:28,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 22:44:28,704 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-08-18 22:44:28,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:44:28,705 INFO L225 Difference]: With dead ends: 36 [2020-08-18 22:44:28,705 INFO L226 Difference]: Without dead ends: 24 [2020-08-18 22:44:28,707 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 22:44:28,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-18 22:44:28,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-08-18 22:44:28,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-18 22:44:28,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-08-18 22:44:28,714 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2020-08-18 22:44:28,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:44:28,715 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-08-18 22:44:28,715 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 22:44:28,715 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-08-18 22:44:28,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 22:44:28,718 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:44:28,718 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:44:28,718 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 22:44:28,718 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:44:28,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:44:28,719 INFO L82 PathProgramCache]: Analyzing trace with hash -9513713, now seen corresponding path program 2 times [2020-08-18 22:44:28,719 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:44:28,720 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1926346713] [2020-08-18 22:44:28,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:44:28,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:44:28,799 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:44:28,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:44:28,804 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-08-18 22:44:28,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:44:28,811 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:44:28,811 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1926346713] [2020-08-18 22:44:28,812 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:44:28,812 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 22:44:28,812 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1320220047] [2020-08-18 22:44:28,813 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 22:44:28,813 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:44:28,813 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 22:44:28,814 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 22:44:28,814 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 6 states. [2020-08-18 22:44:28,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:44:28,941 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2020-08-18 22:44:28,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 22:44:28,941 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2020-08-18 22:44:28,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:44:28,942 INFO L225 Difference]: With dead ends: 38 [2020-08-18 22:44:28,942 INFO L226 Difference]: Without dead ends: 26 [2020-08-18 22:44:28,943 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 22:44:28,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-18 22:44:28,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-08-18 22:44:28,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-18 22:44:28,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2020-08-18 22:44:28,952 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 22 [2020-08-18 22:44:28,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:44:28,954 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2020-08-18 22:44:28,954 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 22:44:28,954 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2020-08-18 22:44:28,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 22:44:28,955 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:44:28,955 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:44:28,956 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 22:44:28,956 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:44:28,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:44:28,956 INFO L82 PathProgramCache]: Analyzing trace with hash 2113766385, now seen corresponding path program 3 times [2020-08-18 22:44:28,957 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:44:28,957 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [188685559] [2020-08-18 22:44:28,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:44:29,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:44:29,099 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:44:29,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:44:29,105 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-18 22:44:29,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:44:29,114 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:44:29,114 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [188685559] [2020-08-18 22:44:29,115 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:44:29,115 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 22:44:29,115 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [400217335] [2020-08-18 22:44:29,116 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 22:44:29,117 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:44:29,117 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 22:44:29,118 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-18 22:44:29,118 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 7 states. [2020-08-18 22:44:29,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:44:29,212 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2020-08-18 22:44:29,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 22:44:29,213 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 24 [2020-08-18 22:44:29,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:44:29,214 INFO L225 Difference]: With dead ends: 40 [2020-08-18 22:44:29,214 INFO L226 Difference]: Without dead ends: 28 [2020-08-18 22:44:29,215 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-18 22:44:29,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-18 22:44:29,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-08-18 22:44:29,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-18 22:44:29,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-08-18 22:44:29,227 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 24 [2020-08-18 22:44:29,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:44:29,228 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-08-18 22:44:29,229 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 22:44:29,229 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-08-18 22:44:29,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-18 22:44:29,230 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:44:29,231 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:44:29,231 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 22:44:29,231 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:44:29,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:44:29,232 INFO L82 PathProgramCache]: Analyzing trace with hash -1818492333, now seen corresponding path program 4 times [2020-08-18 22:44:29,232 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:44:29,233 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [686789149] [2020-08-18 22:44:29,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:44:29,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:44:29,349 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:44:29,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:44:29,352 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2020-08-18 22:44:29,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:44:29,357 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:44:29,358 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [686789149] [2020-08-18 22:44:29,358 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:44:29,358 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 22:44:29,358 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1093031505] [2020-08-18 22:44:29,359 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 22:44:29,359 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:44:29,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 22:44:29,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-18 22:44:29,360 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 8 states. [2020-08-18 22:44:29,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:44:29,425 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2020-08-18 22:44:29,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 22:44:29,426 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2020-08-18 22:44:29,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:44:29,427 INFO L225 Difference]: With dead ends: 42 [2020-08-18 22:44:29,427 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 22:44:29,428 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-18 22:44:29,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 22:44:29,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-18 22:44:29,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 22:44:29,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2020-08-18 22:44:29,433 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 26 [2020-08-18 22:44:29,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:44:29,434 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2020-08-18 22:44:29,434 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 22:44:29,434 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2020-08-18 22:44:29,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 22:44:29,435 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:44:29,435 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:44:29,435 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 22:44:29,436 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:44:29,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:44:29,436 INFO L82 PathProgramCache]: Analyzing trace with hash -1147899851, now seen corresponding path program 5 times [2020-08-18 22:44:29,436 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:44:29,437 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [610577745] [2020-08-18 22:44:29,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:44:29,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:44:29,522 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:44:29,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:44:29,525 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2020-08-18 22:44:29,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:44:29,529 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:44:29,530 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [610577745] [2020-08-18 22:44:29,530 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:44:29,530 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 22:44:29,530 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1047524517] [2020-08-18 22:44:29,531 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 22:44:29,531 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:44:29,531 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 22:44:29,532 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-18 22:44:29,532 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 9 states. [2020-08-18 22:44:29,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:44:29,609 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2020-08-18 22:44:29,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 22:44:29,610 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-08-18 22:44:29,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:44:29,611 INFO L225 Difference]: With dead ends: 44 [2020-08-18 22:44:29,611 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 22:44:29,612 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-18 22:44:29,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 22:44:29,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-18 22:44:29,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 22:44:29,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2020-08-18 22:44:29,617 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 28 [2020-08-18 22:44:29,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:44:29,617 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2020-08-18 22:44:29,617 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 22:44:29,618 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2020-08-18 22:44:29,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 22:44:29,618 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:44:29,619 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:44:29,619 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 22:44:29,619 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:44:29,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:44:29,619 INFO L82 PathProgramCache]: Analyzing trace with hash -953619049, now seen corresponding path program 6 times [2020-08-18 22:44:29,620 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:44:29,620 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [835472390] [2020-08-18 22:44:29,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:44:29,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:44:29,710 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:44:29,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:44:29,713 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-18 22:44:29,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:44:29,717 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:44:29,718 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [835472390] [2020-08-18 22:44:29,718 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:44:29,718 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 22:44:29,718 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [517837147] [2020-08-18 22:44:29,719 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 22:44:29,719 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:44:29,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 22:44:29,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-18 22:44:29,720 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 10 states. [2020-08-18 22:44:29,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:44:29,795 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2020-08-18 22:44:29,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 22:44:29,795 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 30 [2020-08-18 22:44:29,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:44:29,796 INFO L225 Difference]: With dead ends: 46 [2020-08-18 22:44:29,796 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 22:44:29,797 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-18 22:44:29,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 22:44:29,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-18 22:44:29,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 22:44:29,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-08-18 22:44:29,803 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 30 [2020-08-18 22:44:29,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:44:29,803 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-08-18 22:44:29,803 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 22:44:29,803 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-08-18 22:44:29,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 22:44:29,804 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:44:29,804 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:44:29,805 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 22:44:29,805 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:44:29,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:44:29,805 INFO L82 PathProgramCache]: Analyzing trace with hash 1066637945, now seen corresponding path program 7 times [2020-08-18 22:44:29,805 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:44:29,806 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [977863491] [2020-08-18 22:44:29,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:44:29,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:44:29,917 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:44:29,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:44:29,920 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2020-08-18 22:44:29,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:44:29,926 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:44:29,926 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [977863491] [2020-08-18 22:44:29,927 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:44:29,927 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 22:44:29,927 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1864051925] [2020-08-18 22:44:29,928 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 22:44:29,928 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:44:29,928 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 22:44:29,929 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-18 22:44:29,929 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2020-08-18 22:44:30,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:44:30,033 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-08-18 22:44:30,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 22:44:30,034 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 32 [2020-08-18 22:44:30,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:44:30,035 INFO L225 Difference]: With dead ends: 48 [2020-08-18 22:44:30,035 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 22:44:30,036 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-18 22:44:30,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 22:44:30,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-18 22:44:30,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 22:44:30,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2020-08-18 22:44:30,040 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 32 [2020-08-18 22:44:30,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:44:30,041 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2020-08-18 22:44:30,041 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 22:44:30,041 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2020-08-18 22:44:30,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 22:44:30,042 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:44:30,042 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:44:30,042 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 22:44:30,042 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:44:30,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:44:30,043 INFO L82 PathProgramCache]: Analyzing trace with hash 1208391387, now seen corresponding path program 8 times [2020-08-18 22:44:30,043 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:44:30,043 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [454723158] [2020-08-18 22:44:30,043 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:44:30,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:44:30,167 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:44:30,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:44:30,170 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2020-08-18 22:44:30,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:44:30,175 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:44:30,175 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [454723158] [2020-08-18 22:44:30,175 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:44:30,176 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 22:44:30,176 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1982334205] [2020-08-18 22:44:30,176 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 22:44:30,177 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:44:30,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 22:44:30,177 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-18 22:44:30,177 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 12 states. [2020-08-18 22:44:30,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:44:30,262 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2020-08-18 22:44:30,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 22:44:30,263 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-18 22:44:30,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:44:30,264 INFO L225 Difference]: With dead ends: 50 [2020-08-18 22:44:30,264 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 22:44:30,264 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-18 22:44:30,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 22:44:30,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-18 22:44:30,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 22:44:30,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2020-08-18 22:44:30,270 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 34 [2020-08-18 22:44:30,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:44:30,270 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2020-08-18 22:44:30,270 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 22:44:30,270 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2020-08-18 22:44:30,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 22:44:30,271 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:44:30,271 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:44:30,272 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 22:44:30,272 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:44:30,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:44:30,272 INFO L82 PathProgramCache]: Analyzing trace with hash -5504323, now seen corresponding path program 9 times [2020-08-18 22:44:30,272 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:44:30,273 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [726611847] [2020-08-18 22:44:30,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:44:30,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:44:30,403 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:44:30,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:44:30,406 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2020-08-18 22:44:30,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:44:30,410 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:44:30,410 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [726611847] [2020-08-18 22:44:30,410 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:44:30,411 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 22:44:30,411 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2124662643] [2020-08-18 22:44:30,411 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 22:44:30,411 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:44:30,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 22:44:30,412 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-18 22:44:30,412 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 13 states. [2020-08-18 22:44:30,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:44:30,506 INFO L93 Difference]: Finished difference Result 51 states and 53 transitions. [2020-08-18 22:44:30,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 22:44:30,506 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-18 22:44:30,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:44:30,507 INFO L225 Difference]: With dead ends: 51 [2020-08-18 22:44:30,507 INFO L226 Difference]: Without dead ends: 39 [2020-08-18 22:44:30,508 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-18 22:44:30,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-18 22:44:30,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-18 22:44:30,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 22:44:30,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-08-18 22:44:30,513 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 36 [2020-08-18 22:44:30,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:44:30,514 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-08-18 22:44:30,514 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 22:44:30,514 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-08-18 22:44:30,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 22:44:30,515 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:44:30,515 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:44:30,515 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 22:44:30,516 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:44:30,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:44:30,516 INFO L82 PathProgramCache]: Analyzing trace with hash 1671822879, now seen corresponding path program 10 times [2020-08-18 22:44:30,516 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:44:30,517 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [441920434] [2020-08-18 22:44:30,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:44:30,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:44:40,099 WARN L193 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 8 [2020-08-18 22:44:41,070 WARN L193 SmtUtils]: Spent 757.00 ms on a formula simplification. DAG size of input: 567 DAG size of output: 11 [2020-08-18 22:44:45,172 WARN L193 SmtUtils]: Spent 3.64 s on a formula simplification. DAG size of input: 1063 DAG size of output: 8 [2020-08-18 22:45:13,194 WARN L193 SmtUtils]: Spent 27.17 s on a formula simplification. DAG size of input: 2458 DAG size of output: 8 [2020-08-18 22:45:13,548 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:45:13,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:45:13,552 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2020-08-18 22:45:13,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:45:13,559 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 99 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 22:45:13,560 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [441920434] [2020-08-18 22:45:13,560 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:45:13,560 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 22:45:13,561 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [37569292] [2020-08-18 22:45:13,561 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 22:45:13,561 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:45:13,562 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 22:45:13,562 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=201, Unknown=0, NotChecked=0, Total=240 [2020-08-18 22:45:13,562 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 16 states. [2020-08-18 22:45:14,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:45:14,021 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-08-18 22:45:14,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 22:45:14,022 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 38 [2020-08-18 22:45:14,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:45:14,023 INFO L225 Difference]: With dead ends: 49 [2020-08-18 22:45:14,023 INFO L226 Difference]: Without dead ends: 41 [2020-08-18 22:45:14,024 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 33.2s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-08-18 22:45:14,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-18 22:45:14,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-18 22:45:14,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 22:45:14,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2020-08-18 22:45:14,032 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 38 [2020-08-18 22:45:14,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:45:14,032 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2020-08-18 22:45:14,032 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 22:45:14,033 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2020-08-18 22:45:14,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-18 22:45:14,033 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:45:14,034 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:45:14,036 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 22:45:14,036 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:45:14,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:45:14,036 INFO L82 PathProgramCache]: Analyzing trace with hash 443458522, now seen corresponding path program 1 times [2020-08-18 22:45:14,037 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:45:14,037 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1808222572] [2020-08-18 22:45:14,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:45:14,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:45:18,462 WARN L193 SmtUtils]: Spent 457.00 ms on a formula simplification. DAG size of input: 180 DAG size of output: 8 [2020-08-18 22:45:19,510 WARN L193 SmtUtils]: Spent 819.00 ms on a formula simplification. DAG size of input: 401 DAG size of output: 8 [2020-08-18 22:45:23,685 WARN L193 SmtUtils]: Spent 3.79 s on a formula simplification. DAG size of input: 830 DAG size of output: 8 [2020-08-18 22:45:24,196 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:45:24,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:45:24,209 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2020-08-18 22:45:24,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:45:24,258 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 101 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 22:45:24,259 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1808222572] [2020-08-18 22:45:24,259 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:45:24,259 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 22:45:24,260 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [662066687] [2020-08-18 22:45:24,260 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 22:45:24,260 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:45:24,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 22:45:24,261 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=370, Unknown=0, NotChecked=0, Total=420 [2020-08-18 22:45:24,261 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 21 states. [2020-08-18 22:45:25,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:45:25,225 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-08-18 22:45:25,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 22:45:25,226 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 40 [2020-08-18 22:45:25,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:45:25,227 INFO L225 Difference]: With dead ends: 48 [2020-08-18 22:45:25,227 INFO L226 Difference]: Without dead ends: 43 [2020-08-18 22:45:25,228 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=94, Invalid=718, Unknown=0, NotChecked=0, Total=812 [2020-08-18 22:45:25,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-18 22:45:25,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-18 22:45:25,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 22:45:25,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2020-08-18 22:45:25,237 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 40 [2020-08-18 22:45:25,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:45:25,237 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2020-08-18 22:45:25,237 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 22:45:25,237 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2020-08-18 22:45:25,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-18 22:45:25,238 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:45:25,238 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:45:25,238 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 22:45:25,239 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:45:25,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:45:25,239 INFO L82 PathProgramCache]: Analyzing trace with hash 1101317845, now seen corresponding path program 2 times [2020-08-18 22:45:25,239 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:45:25,239 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1662107128] [2020-08-18 22:45:25,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:45:25,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat