/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=LOWLEXORDER -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 18:42:37,540 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 18:42:37,542 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 18:42:37,579 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-08-18 18:42:37,601 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 18:42:37,605 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 18:42:37,607 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 18:42:37,609 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 18:42:37,610 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 18:42:37,612 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 18:42:37,614 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 18:42:37,619 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 18:42:37,623 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 18:42:37,624 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 18:42:37,627 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 18:42:37,628 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 18:42:37,630 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 18:42:37,647 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 18:42:37,648 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 18:42:37,649 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 18:42:37,651 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 18:42:37,687 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 18:42:37,688 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 18:42:37,690 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 18:42:37,690 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 18:42:37,690 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 18:42:37,691 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 18:42:37,691 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 18:42:37,691 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 18:42:37,691 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 18:42:37,692 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 18:42:37,693 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 18:42:37,693 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 18:42:37,693 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 18:42:37,694 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 18:42:37,694 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 18:42:37,694 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 18:42:37,694 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 18:42:37,694 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 18:42:37,695 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 18:42:37,695 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 18:42:37,695 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 18:42:37,695 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 18:42:37,695 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 18:42:37,696 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 18:42:37,696 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 18:42:37,696 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 18:42:37,696 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 18:42:37,696 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 18:42:37,696 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 18:42:37,697 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=LOWLEXORDER; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=LOWLEXORDER; [2020-08-18 18:42:37,987 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 18:42:38,001 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 18:42:38,004 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 18:42:38,005 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 18:42:38,007 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 18:42:38,008 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/test25-2.c [2020-08-18 18:42:38,082 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a29900f9a/f8b4bac747a645a393ea2285be6005c3/FLAG930aeba03 [2020-08-18 18:42:38,570 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 18:42:38,571 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/ldv-regression/test25-2.c [2020-08-18 18:42:38,578 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a29900f9a/f8b4bac747a645a393ea2285be6005c3/FLAG930aeba03 [2020-08-18 18:42:38,907 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a29900f9a/f8b4bac747a645a393ea2285be6005c3 [2020-08-18 18:42:38,917 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 18:42:38,919 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 18:42:38,920 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 18:42:38,920 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 18:42:38,924 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 18:42:38,925 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 06:42:38" (1/1) ... [2020-08-18 18:42:38,927 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1fc4fd3a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:42:38, skipping insertion in model container [2020-08-18 18:42:38,927 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 06:42:38" (1/1) ... [2020-08-18 18:42:38,935 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 18:42:38,954 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 18:42:39,152 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 18:42:39,161 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 18:42:39,182 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 18:42:39,198 INFO L208 MainTranslator]: Completed translation [2020-08-18 18:42:39,199 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:42:39 WrapperNode [2020-08-18 18:42:39,199 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 18:42:39,200 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 18:42:39,200 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 18:42:39,200 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 18:42:39,298 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:42:39" (1/1) ... [2020-08-18 18:42:39,298 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:42:39" (1/1) ... [2020-08-18 18:42:39,313 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:42:39" (1/1) ... [2020-08-18 18:42:39,313 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:42:39" (1/1) ... [2020-08-18 18:42:39,325 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:42:39" (1/1) ... [2020-08-18 18:42:39,330 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:42:39" (1/1) ... [2020-08-18 18:42:39,331 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:42:39" (1/1) ... [2020-08-18 18:42:39,334 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 18:42:39,335 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 18:42:39,335 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 18:42:39,335 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 18:42:39,336 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:42:39" (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 18:42:39,389 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 18:42:39,389 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 18:42:39,389 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2020-08-18 18:42:39,389 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 18:42:39,389 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 18:42:39,389 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-18 18:42:39,390 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-18 18:42:39,390 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-18 18:42:39,390 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-18 18:42:39,390 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 18:42:39,390 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-18 18:42:39,390 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-18 18:42:39,391 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-18 18:42:39,391 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 18:42:39,391 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 18:42:39,391 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 18:42:39,677 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 18:42:39,677 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-08-18 18:42:39,682 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 06:42:39 BoogieIcfgContainer [2020-08-18 18:42:39,682 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 18:42:39,684 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 18:42:39,684 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 18:42:39,687 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 18:42:39,687 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 06:42:38" (1/3) ... [2020-08-18 18:42:39,688 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@68eaa3d1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 06:42:39, skipping insertion in model container [2020-08-18 18:42:39,688 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:42:39" (2/3) ... [2020-08-18 18:42:39,689 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@68eaa3d1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 06:42:39, skipping insertion in model container [2020-08-18 18:42:39,689 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 06:42:39" (3/3) ... [2020-08-18 18:42:39,691 INFO L109 eAbstractionObserver]: Analyzing ICFG test25-2.c [2020-08-18 18:42:39,702 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 18:42:39,712 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 18:42:39,728 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 18:42:39,753 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 18:42:39,753 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 18:42:39,754 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 18:42:39,754 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 18:42:39,754 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 18:42:39,754 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 18:42:39,754 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 18:42:39,754 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 18:42:39,775 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-08-18 18:42:39,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-18 18:42:39,782 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:42:39,783 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 18:42:39,783 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:42:39,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:42:39,796 INFO L82 PathProgramCache]: Analyzing trace with hash -899836778, now seen corresponding path program 1 times [2020-08-18 18:42:39,805 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:42:39,806 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [675489227] [2020-08-18 18:42:39,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:42:39,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:42:39,976 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:42:39,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:42:39,986 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-18 18:42:39,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:42:40,003 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 18:42:40,007 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [675489227] [2020-08-18 18:42:40,010 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 18:42:40,010 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 18:42:40,011 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [578553320] [2020-08-18 18:42:40,015 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 18:42:40,015 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:42:40,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 18:42:40,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 18:42:40,028 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 3 states. [2020-08-18 18:42:40,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:42:40,135 INFO L93 Difference]: Finished difference Result 42 states and 52 transitions. [2020-08-18 18:42:40,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 18:42:40,137 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-08-18 18:42:40,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:42:40,147 INFO L225 Difference]: With dead ends: 42 [2020-08-18 18:42:40,153 INFO L226 Difference]: Without dead ends: 20 [2020-08-18 18:42:40,157 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 18:42:40,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-18 18:42:40,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-18 18:42:40,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-18 18:42:40,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-08-18 18:42:40,190 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2020-08-18 18:42:40,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:42:40,190 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-08-18 18:42:40,190 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 18:42:40,191 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-08-18 18:42:40,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-18 18:42:40,192 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:42:40,192 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 18:42:40,192 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 18:42:40,193 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:42:40,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:42:40,193 INFO L82 PathProgramCache]: Analyzing trace with hash -1137678901, now seen corresponding path program 1 times [2020-08-18 18:42:40,194 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:42:40,194 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1684591741] [2020-08-18 18:42:40,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:42:40,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:42:40,275 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:42:40,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:42:40,281 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-18 18:42:40,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:42:40,293 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 18:42:40,293 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1684591741] [2020-08-18 18:42:40,293 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 18:42:40,294 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 18:42:40,294 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1963398008] [2020-08-18 18:42:40,296 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 18:42:40,296 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:42:40,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 18:42:40,297 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 18:42:40,297 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 4 states. [2020-08-18 18:42:40,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:42:40,371 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2020-08-18 18:42:40,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 18:42:40,372 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2020-08-18 18:42:40,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:42:40,373 INFO L225 Difference]: With dead ends: 34 [2020-08-18 18:42:40,373 INFO L226 Difference]: Without dead ends: 22 [2020-08-18 18:42:40,374 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 18:42:40,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-18 18:42:40,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-18 18:42:40,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-18 18:42:40,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-18 18:42:40,381 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2020-08-18 18:42:40,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:42:40,382 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-18 18:42:40,382 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 18:42:40,382 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-18 18:42:40,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 18:42:40,383 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:42:40,383 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 18:42:40,384 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 18:42:40,384 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:42:40,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:42:40,384 INFO L82 PathProgramCache]: Analyzing trace with hash 278779309, now seen corresponding path program 1 times [2020-08-18 18:42:40,385 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:42:40,385 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [466821661] [2020-08-18 18:42:40,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:42:40,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:42:40,474 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:42:40,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:42:40,482 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-08-18 18:42:40,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:42:40,497 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 18:42:40,497 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [466821661] [2020-08-18 18:42:40,498 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:42:40,498 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 18:42:40,498 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [939791371] [2020-08-18 18:42:40,499 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 18:42:40,499 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:42:40,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 18:42:40,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 18:42:40,500 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 5 states. [2020-08-18 18:42:40,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:42:40,575 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2020-08-18 18:42:40,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 18:42:40,576 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-08-18 18:42:40,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:42:40,577 INFO L225 Difference]: With dead ends: 36 [2020-08-18 18:42:40,577 INFO L226 Difference]: Without dead ends: 24 [2020-08-18 18:42:40,578 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 18:42:40,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-18 18:42:40,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-08-18 18:42:40,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-18 18:42:40,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-08-18 18:42:40,589 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2020-08-18 18:42:40,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:42:40,591 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-08-18 18:42:40,591 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 18:42:40,592 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-08-18 18:42:40,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 18:42:40,592 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:42:40,593 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 18:42:40,593 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 18:42:40,593 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:42:40,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:42:40,595 INFO L82 PathProgramCache]: Analyzing trace with hash -9513713, now seen corresponding path program 2 times [2020-08-18 18:42:40,595 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:42:40,595 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1068867522] [2020-08-18 18:42:40,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:42:40,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:42:40,712 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:42:40,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:42:40,717 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-08-18 18:42:40,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:42:40,724 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 18:42:40,724 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1068867522] [2020-08-18 18:42:40,725 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:42:40,725 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 18:42:40,725 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [203224166] [2020-08-18 18:42:40,726 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 18:42:40,726 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:42:40,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 18:42:40,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 18:42:40,727 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 6 states. [2020-08-18 18:42:40,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:42:40,818 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2020-08-18 18:42:40,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 18:42:40,819 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2020-08-18 18:42:40,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:42:40,820 INFO L225 Difference]: With dead ends: 38 [2020-08-18 18:42:40,820 INFO L226 Difference]: Without dead ends: 26 [2020-08-18 18:42:40,821 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 18:42:40,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-18 18:42:40,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-08-18 18:42:40,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-18 18:42:40,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2020-08-18 18:42:40,827 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 22 [2020-08-18 18:42:40,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:42:40,827 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2020-08-18 18:42:40,827 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 18:42:40,828 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2020-08-18 18:42:40,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 18:42:40,829 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:42:40,829 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 18:42:40,829 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 18:42:40,829 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:42:40,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:42:40,830 INFO L82 PathProgramCache]: Analyzing trace with hash 2113766385, now seen corresponding path program 3 times [2020-08-18 18:42:40,830 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:42:40,830 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [836053760] [2020-08-18 18:42:40,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:42:40,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:42:40,921 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:42:40,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:42:40,926 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-18 18:42:40,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:42:40,932 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 18:42:40,932 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [836053760] [2020-08-18 18:42:40,933 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:42:40,933 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 18:42:40,933 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1624158623] [2020-08-18 18:42:40,934 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 18:42:40,934 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:42:40,934 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 18:42:40,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-18 18:42:40,935 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 7 states. [2020-08-18 18:42:41,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:42:41,022 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2020-08-18 18:42:41,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 18:42:41,023 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 24 [2020-08-18 18:42:41,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:42:41,024 INFO L225 Difference]: With dead ends: 40 [2020-08-18 18:42:41,024 INFO L226 Difference]: Without dead ends: 28 [2020-08-18 18:42:41,025 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 18:42:41,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-18 18:42:41,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-08-18 18:42:41,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-18 18:42:41,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-08-18 18:42:41,037 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 24 [2020-08-18 18:42:41,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:42:41,038 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-08-18 18:42:41,038 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 18:42:41,038 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-08-18 18:42:41,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-18 18:42:41,040 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:42:41,040 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 18:42:41,040 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 18:42:41,040 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:42:41,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:42:41,041 INFO L82 PathProgramCache]: Analyzing trace with hash -1818492333, now seen corresponding path program 4 times [2020-08-18 18:42:41,041 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:42:41,042 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1951288783] [2020-08-18 18:42:41,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:42:41,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:42:41,177 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:42:41,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:42:41,181 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2020-08-18 18:42:41,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:42:41,186 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 18:42:41,186 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1951288783] [2020-08-18 18:42:41,187 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:42:41,187 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 18:42:41,187 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [43432120] [2020-08-18 18:42:41,188 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 18:42:41,188 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:42:41,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 18:42:41,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-18 18:42:41,189 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 8 states. [2020-08-18 18:42:41,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:42:41,262 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2020-08-18 18:42:41,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 18:42:41,263 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2020-08-18 18:42:41,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:42:41,264 INFO L225 Difference]: With dead ends: 42 [2020-08-18 18:42:41,264 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 18:42:41,265 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 18:42:41,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 18:42:41,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-18 18:42:41,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 18:42:41,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2020-08-18 18:42:41,270 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 26 [2020-08-18 18:42:41,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:42:41,271 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2020-08-18 18:42:41,271 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 18:42:41,271 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2020-08-18 18:42:41,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 18:42:41,272 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:42:41,272 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 18:42:41,273 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 18:42:41,273 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:42:41,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:42:41,273 INFO L82 PathProgramCache]: Analyzing trace with hash -1147899851, now seen corresponding path program 5 times [2020-08-18 18:42:41,274 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:42:41,274 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1095939707] [2020-08-18 18:42:41,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:42:41,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:42:41,366 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:42:41,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:42:41,369 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2020-08-18 18:42:41,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:42:41,374 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 18:42:41,374 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1095939707] [2020-08-18 18:42:41,374 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:42:41,375 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 18:42:41,375 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1091798550] [2020-08-18 18:42:41,375 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 18:42:41,376 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:42:41,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 18:42:41,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-18 18:42:41,376 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 9 states. [2020-08-18 18:42:41,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:42:41,478 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2020-08-18 18:42:41,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 18:42:41,479 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-08-18 18:42:41,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:42:41,480 INFO L225 Difference]: With dead ends: 44 [2020-08-18 18:42:41,480 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 18:42:41,481 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 18:42:41,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 18:42:41,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-18 18:42:41,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 18:42:41,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2020-08-18 18:42:41,486 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 28 [2020-08-18 18:42:41,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:42:41,486 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2020-08-18 18:42:41,487 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 18:42:41,487 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2020-08-18 18:42:41,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 18:42:41,488 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:42:41,488 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 18:42:41,488 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 18:42:41,488 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:42:41,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:42:41,489 INFO L82 PathProgramCache]: Analyzing trace with hash -953619049, now seen corresponding path program 6 times [2020-08-18 18:42:41,489 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:42:41,489 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1031284687] [2020-08-18 18:42:41,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:42:41,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:42:41,589 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:42:41,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:42:41,593 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-18 18:42:41,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:42:41,598 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 18:42:41,599 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1031284687] [2020-08-18 18:42:41,599 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:42:41,599 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 18:42:41,600 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [312629712] [2020-08-18 18:42:41,600 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 18:42:41,600 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:42:41,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 18:42:41,601 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-18 18:42:41,601 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 10 states. [2020-08-18 18:42:41,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:42:41,692 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2020-08-18 18:42:41,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 18:42:41,693 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 30 [2020-08-18 18:42:41,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:42:41,694 INFO L225 Difference]: With dead ends: 46 [2020-08-18 18:42:41,694 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 18:42:41,695 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 18:42:41,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 18:42:41,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-18 18:42:41,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 18:42:41,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-08-18 18:42:41,701 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 30 [2020-08-18 18:42:41,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:42:41,701 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-08-18 18:42:41,701 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 18:42:41,701 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-08-18 18:42:41,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 18:42:41,702 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:42:41,703 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 18:42:41,703 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 18:42:41,703 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:42:41,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:42:41,704 INFO L82 PathProgramCache]: Analyzing trace with hash 1066637945, now seen corresponding path program 7 times [2020-08-18 18:42:41,704 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:42:41,704 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1706145795] [2020-08-18 18:42:41,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:42:41,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:42:41,832 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:42:41,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:42:41,835 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2020-08-18 18:42:41,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:42:41,841 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 18:42:41,841 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1706145795] [2020-08-18 18:42:41,841 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:42:41,841 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 18:42:41,842 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [513863598] [2020-08-18 18:42:41,842 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 18:42:41,843 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:42:41,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 18:42:41,843 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-18 18:42:41,843 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2020-08-18 18:42:41,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:42:41,953 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-08-18 18:42:41,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 18:42:41,953 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 32 [2020-08-18 18:42:41,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:42:41,954 INFO L225 Difference]: With dead ends: 48 [2020-08-18 18:42:41,955 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 18:42:41,955 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 18:42:41,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 18:42:41,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-18 18:42:41,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 18:42:41,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2020-08-18 18:42:41,960 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 32 [2020-08-18 18:42:41,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:42:41,960 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2020-08-18 18:42:41,961 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 18:42:41,961 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2020-08-18 18:42:41,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 18:42:41,962 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:42:41,962 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 18:42:41,962 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 18:42:41,962 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:42:41,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:42:41,963 INFO L82 PathProgramCache]: Analyzing trace with hash 1208391387, now seen corresponding path program 8 times [2020-08-18 18:42:41,963 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:42:41,963 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [341438723] [2020-08-18 18:42:41,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:42:41,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:42:42,075 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:42:42,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:42:42,078 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2020-08-18 18:42:42,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:42:42,082 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 18:42:42,083 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [341438723] [2020-08-18 18:42:42,083 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:42:42,083 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 18:42:42,083 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1274015944] [2020-08-18 18:42:42,084 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 18:42:42,084 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:42:42,084 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 18:42:42,085 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-18 18:42:42,085 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 12 states. [2020-08-18 18:42:42,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:42:42,159 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2020-08-18 18:42:42,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 18:42:42,160 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-18 18:42:42,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:42:42,161 INFO L225 Difference]: With dead ends: 50 [2020-08-18 18:42:42,161 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 18:42:42,162 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 18:42:42,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 18:42:42,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-18 18:42:42,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 18:42:42,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2020-08-18 18:42:42,166 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 34 [2020-08-18 18:42:42,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:42:42,167 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2020-08-18 18:42:42,167 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 18:42:42,167 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2020-08-18 18:42:42,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 18:42:42,168 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:42:42,168 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 18:42:42,168 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 18:42:42,168 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:42:42,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:42:42,169 INFO L82 PathProgramCache]: Analyzing trace with hash -5504323, now seen corresponding path program 9 times [2020-08-18 18:42:42,169 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:42:42,169 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [924399669] [2020-08-18 18:42:42,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:42:42,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:42:42,294 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:42:42,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:42:42,297 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2020-08-18 18:42:42,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:42:42,301 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 18:42:42,302 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [924399669] [2020-08-18 18:42:42,302 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:42:42,302 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 18:42:42,302 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [983002393] [2020-08-18 18:42:42,303 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 18:42:42,303 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:42:42,303 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 18:42:42,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-18 18:42:42,303 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 13 states. [2020-08-18 18:42:42,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:42:42,391 INFO L93 Difference]: Finished difference Result 51 states and 53 transitions. [2020-08-18 18:42:42,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 18:42:42,391 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-18 18:42:42,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:42:42,392 INFO L225 Difference]: With dead ends: 51 [2020-08-18 18:42:42,392 INFO L226 Difference]: Without dead ends: 39 [2020-08-18 18:42:42,393 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 18:42:42,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-18 18:42:42,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-18 18:42:42,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 18:42:42,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-08-18 18:42:42,398 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 36 [2020-08-18 18:42:42,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:42:42,399 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-08-18 18:42:42,399 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 18:42:42,399 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-08-18 18:42:42,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 18:42:42,402 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:42:42,402 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 18:42:42,403 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 18:42:42,403 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:42:42,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:42:42,403 INFO L82 PathProgramCache]: Analyzing trace with hash 1671822879, now seen corresponding path program 10 times [2020-08-18 18:42:42,403 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:42:42,404 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1288562118] [2020-08-18 18:42:42,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:42:42,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:42:52,355 WARN L193 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 8 [2020-08-18 18:42:53,370 WARN L193 SmtUtils]: Spent 810.00 ms on a formula simplification. DAG size of input: 567 DAG size of output: 11 [2020-08-18 18:42:57,520 WARN L193 SmtUtils]: Spent 3.68 s on a formula simplification. DAG size of input: 1063 DAG size of output: 8 [2020-08-18 18:43:25,180 WARN L193 SmtUtils]: Spent 26.78 s on a formula simplification. DAG size of input: 2458 DAG size of output: 8 [2020-08-18 18:43:25,543 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:43:25,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:43:25,547 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2020-08-18 18:43:25,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:43:25,556 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 18:43:25,556 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1288562118] [2020-08-18 18:43:25,556 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:43:25,557 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 18:43:25,557 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2038167124] [2020-08-18 18:43:25,557 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 18:43:25,558 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:43:25,559 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 18:43:25,559 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=201, Unknown=0, NotChecked=0, Total=240 [2020-08-18 18:43:25,559 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 16 states. [2020-08-18 18:43:25,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:43:25,980 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-08-18 18:43:25,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 18:43:25,980 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 38 [2020-08-18 18:43:25,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:43:25,981 INFO L225 Difference]: With dead ends: 49 [2020-08-18 18:43:25,981 INFO L226 Difference]: Without dead ends: 41 [2020-08-18 18:43:25,982 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 32.9s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-08-18 18:43:25,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-18 18:43:25,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-18 18:43:25,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 18:43:25,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2020-08-18 18:43:25,994 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 38 [2020-08-18 18:43:25,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:43:25,995 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2020-08-18 18:43:25,996 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 18:43:25,997 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2020-08-18 18:43:25,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-18 18:43:25,998 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:43:25,998 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 18:43:25,998 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 18:43:25,998 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:43:25,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:43:25,999 INFO L82 PathProgramCache]: Analyzing trace with hash 443458522, now seen corresponding path program 1 times [2020-08-18 18:43:25,999 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:43:25,999 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [391689895] [2020-08-18 18:43:25,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:43:26,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:43:30,034 WARN L193 SmtUtils]: Spent 306.00 ms on a formula simplification. DAG size of input: 180 DAG size of output: 8 [2020-08-18 18:43:31,090 WARN L193 SmtUtils]: Spent 852.00 ms on a formula simplification. DAG size of input: 401 DAG size of output: 8 [2020-08-18 18:43:35,307 WARN L193 SmtUtils]: Spent 3.84 s on a formula simplification. DAG size of input: 830 DAG size of output: 8 [2020-08-18 18:43:35,526 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 45 [2020-08-18 18:43:35,837 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:43:35,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:43:35,842 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2020-08-18 18:43:35,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:43:35,897 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 18:43:35,898 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [391689895] [2020-08-18 18:43:35,898 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:43:35,898 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 18:43:35,899 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2120867413] [2020-08-18 18:43:35,899 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 18:43:35,899 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:43:35,899 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 18:43:35,900 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=370, Unknown=0, NotChecked=0, Total=420 [2020-08-18 18:43:35,900 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 21 states. [2020-08-18 18:43:36,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:43:36,848 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-08-18 18:43:36,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 18:43:36,848 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 40 [2020-08-18 18:43:36,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:43:36,851 INFO L225 Difference]: With dead ends: 48 [2020-08-18 18:43:36,851 INFO L226 Difference]: Without dead ends: 43 [2020-08-18 18:43:36,852 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=94, Invalid=718, Unknown=0, NotChecked=0, Total=812 [2020-08-18 18:43:36,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-18 18:43:36,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-18 18:43:36,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 18:43:36,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2020-08-18 18:43:36,861 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 40 [2020-08-18 18:43:36,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:43:36,862 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2020-08-18 18:43:36,862 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 18:43:36,862 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2020-08-18 18:43:36,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-18 18:43:36,863 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:43:36,863 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 18:43:36,863 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 18:43:36,863 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:43:36,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:43:36,864 INFO L82 PathProgramCache]: Analyzing trace with hash 1101317845, now seen corresponding path program 2 times [2020-08-18 18:43:36,864 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:43:36,864 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1622249339] [2020-08-18 18:43:36,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:43:37,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat