/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=NARROWEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/ddlm2013.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 22:03:01,688 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 22:03:01,691 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 22:03:01,714 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 22:03:01,715 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 22:03:01,716 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 22:03:01,717 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 22:03:01,719 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 22:03:01,720 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 22:03:01,721 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 22:03:01,722 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 22:03:01,723 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 22:03:01,724 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 22:03:01,725 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 22:03:01,726 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 22:03:01,727 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 22:03:01,727 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 22:03:01,728 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 22:03:01,730 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 22:03:01,732 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 22:03:01,733 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 22:03:01,734 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 22:03:01,735 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 22:03:01,736 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 22:03:01,739 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-18 22:03:01,739 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-18 22:03:01,739 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-18 22:03:01,740 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-18 22:03:01,741 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-18 22:03:01,742 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-08-18 22:03:01,746 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 22:03:01,747 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 22:03:01,748 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 22:03:01,749 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 22:03:01,784 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 22:03:01,785 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 22:03:01,789 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 22:03:01,790 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 22:03:01,790 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 22:03:01,790 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 22:03:01,790 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 22:03:01,790 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 22:03:01,791 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 22:03:01,791 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 22:03:01,791 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 22:03:01,791 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 22:03:01,791 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 22:03:01,792 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 22:03:01,795 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 22:03:01,795 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 22:03:01,795 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 22:03:01,797 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 22:03:01,798 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 22:03:01,798 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 22:03:01,798 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 22:03:01,798 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 22:03:01,798 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 22:03:01,799 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 22:03:01,799 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 22:03:01,799 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 22:03:01,799 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 22:03:01,799 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 22:03:01,800 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 22:03:01,801 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=NARROWEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=NARROWEST; [2020-08-18 22:03:02,144 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 22:03:02,155 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 22:03:02,158 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 22:03:02,160 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 22:03:02,160 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 22:03:02,161 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-18 22:03:02,240 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/7559f834d/83f0a380de594b1bb530db92a3e6fdab/FLAG1a745ad82 [2020-08-18 22:03:02,693 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 22:03:02,694 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-18 22:03:02,701 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/7559f834d/83f0a380de594b1bb530db92a3e6fdab/FLAG1a745ad82 [2020-08-18 22:03:03,081 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/7559f834d/83f0a380de594b1bb530db92a3e6fdab [2020-08-18 22:03:03,089 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 22:03:03,091 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 22:03:03,091 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 22:03:03,092 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 22:03:03,097 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 22:03:03,098 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 10:03:03" (1/1) ... [2020-08-18 22:03:03,102 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@217f90c0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:03:03, skipping insertion in model container [2020-08-18 22:03:03,102 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 10:03:03" (1/1) ... [2020-08-18 22:03:03,112 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 22:03:03,132 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 22:03:03,304 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 22:03:03,309 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 22:03:03,327 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 22:03:03,339 INFO L208 MainTranslator]: Completed translation [2020-08-18 22:03:03,340 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:03:03 WrapperNode [2020-08-18 22:03:03,340 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 22:03:03,341 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 22:03:03,341 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 22:03:03,341 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 22:03:03,350 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:03:03" (1/1) ... [2020-08-18 22:03:03,351 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:03:03" (1/1) ... [2020-08-18 22:03:03,441 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:03:03" (1/1) ... [2020-08-18 22:03:03,441 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:03:03" (1/1) ... [2020-08-18 22:03:03,445 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:03:03" (1/1) ... [2020-08-18 22:03:03,451 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:03:03" (1/1) ... [2020-08-18 22:03:03,452 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:03:03" (1/1) ... [2020-08-18 22:03:03,453 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 22:03:03,454 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 22:03:03,454 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 22:03:03,454 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 22:03:03,455 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:03:03" (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 22:03:03,520 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 22:03:03,520 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 22:03:03,520 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-18 22:03:03,520 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 22:03:03,521 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 22:03:03,521 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 22:03:03,521 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-18 22:03:03,521 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-18 22:03:03,521 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 22:03:03,521 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-18 22:03:03,522 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 22:03:03,522 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 22:03:03,522 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 22:03:03,734 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 22:03:03,735 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-18 22:03:03,738 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 10:03:03 BoogieIcfgContainer [2020-08-18 22:03:03,738 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 22:03:03,740 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 22:03:03,740 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 22:03:03,743 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 22:03:03,743 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 10:03:03" (1/3) ... [2020-08-18 22:03:03,744 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@433789d8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 10:03:03, skipping insertion in model container [2020-08-18 22:03:03,744 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:03:03" (2/3) ... [2020-08-18 22:03:03,744 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@433789d8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 10:03:03, skipping insertion in model container [2020-08-18 22:03:03,745 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 10:03:03" (3/3) ... [2020-08-18 22:03:03,747 INFO L109 eAbstractionObserver]: Analyzing ICFG ddlm2013.i [2020-08-18 22:03:03,758 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 22:03:03,767 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 22:03:03,786 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 22:03:03,838 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 22:03:03,839 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 22:03:03,839 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 22:03:03,839 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 22:03:03,839 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 22:03:03,839 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 22:03:03,839 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 22:03:03,840 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 22:03:03,866 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2020-08-18 22:03:03,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 22:03:03,872 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:03,873 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:03,873 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:03,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:03,881 INFO L82 PathProgramCache]: Analyzing trace with hash -917653371, now seen corresponding path program 1 times [2020-08-18 22:03:03,889 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:03,890 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1068837899] [2020-08-18 22:03:03,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:03,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:04,002 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:04,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:04,015 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 22:03:04,016 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1068837899] [2020-08-18 22:03:04,019 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 22:03:04,020 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-18 22:03:04,021 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [718511811] [2020-08-18 22:03:04,027 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-18 22:03:04,028 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:04,043 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-18 22:03:04,044 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-18 22:03:04,047 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2020-08-18 22:03:04,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:04,077 INFO L93 Difference]: Finished difference Result 35 states and 42 transitions. [2020-08-18 22:03:04,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-18 22:03:04,079 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 12 [2020-08-18 22:03:04,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:04,089 INFO L225 Difference]: With dead ends: 35 [2020-08-18 22:03:04,089 INFO L226 Difference]: Without dead ends: 15 [2020-08-18 22:03:04,093 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-18 22:03:04,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-18 22:03:04,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-18 22:03:04,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 22:03:04,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-18 22:03:04,138 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 12 [2020-08-18 22:03:04,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:04,139 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-18 22:03:04,139 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-18 22:03:04,139 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-18 22:03:04,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-18 22:03:04,140 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:04,140 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:04,140 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 22:03:04,140 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:04,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:04,141 INFO L82 PathProgramCache]: Analyzing trace with hash -1750778295, now seen corresponding path program 1 times [2020-08-18 22:03:04,141 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:04,141 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1253014922] [2020-08-18 22:03:04,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:04,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:04,183 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:04,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:04,188 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 22:03:04,188 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1253014922] [2020-08-18 22:03:04,189 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 22:03:04,189 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 22:03:04,189 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [352330638] [2020-08-18 22:03:04,191 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 22:03:04,192 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:04,192 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 22:03:04,193 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 22:03:04,193 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-08-18 22:03:04,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:04,211 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-08-18 22:03:04,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 22:03:04,212 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2020-08-18 22:03:04,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:04,213 INFO L225 Difference]: With dead ends: 24 [2020-08-18 22:03:04,213 INFO L226 Difference]: Without dead ends: 15 [2020-08-18 22:03:04,215 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 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 22:03:04,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-18 22:03:04,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-18 22:03:04,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 22:03:04,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2020-08-18 22:03:04,220 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2020-08-18 22:03:04,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:04,221 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2020-08-18 22:03:04,221 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 22:03:04,221 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2020-08-18 22:03:04,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-18 22:03:04,222 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:04,222 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:04,223 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 22:03:04,223 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:04,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:04,223 INFO L82 PathProgramCache]: Analyzing trace with hash -941431669, now seen corresponding path program 1 times [2020-08-18 22:03:04,224 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:04,224 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [995754357] [2020-08-18 22:03:04,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:04,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:04,504 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:04,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:04,511 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 22:03:04,512 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [995754357] [2020-08-18 22:03:04,512 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 22:03:04,513 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 22:03:04,513 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1372837455] [2020-08-18 22:03:04,513 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 22:03:04,514 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:04,514 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 22:03:04,515 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 22:03:04,515 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 5 states. [2020-08-18 22:03:04,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:04,548 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2020-08-18 22:03:04,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 22:03:04,549 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-18 22:03:04,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:04,550 INFO L225 Difference]: With dead ends: 23 [2020-08-18 22:03:04,550 INFO L226 Difference]: Without dead ends: 17 [2020-08-18 22:03:04,551 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 22:03:04,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-18 22:03:04,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-18 22:03:04,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 22:03:04,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2020-08-18 22:03:04,563 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 13 [2020-08-18 22:03:04,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:04,564 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2020-08-18 22:03:04,564 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 22:03:04,564 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2020-08-18 22:03:04,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-18 22:03:04,566 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:04,566 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:04,566 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 22:03:04,567 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:04,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:04,567 INFO L82 PathProgramCache]: Analyzing trace with hash 447870728, now seen corresponding path program 1 times [2020-08-18 22:03:04,567 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:04,568 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2106603103] [2020-08-18 22:03:04,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:04,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:04,740 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:04,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:04,743 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:04,744 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2106603103] [2020-08-18 22:03:04,744 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 22:03:04,744 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 22:03:04,744 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [7636915] [2020-08-18 22:03:04,745 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 22:03:04,745 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:04,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 22:03:04,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 22:03:04,746 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 4 states. [2020-08-18 22:03:04,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:04,766 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2020-08-18 22:03:04,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 22:03:04,767 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2020-08-18 22:03:04,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:04,768 INFO L225 Difference]: With dead ends: 26 [2020-08-18 22:03:04,768 INFO L226 Difference]: Without dead ends: 17 [2020-08-18 22:03:04,769 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 22:03:04,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-18 22:03:04,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-18 22:03:04,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 22:03:04,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-18 22:03:04,773 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 16 [2020-08-18 22:03:04,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:04,774 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-18 22:03:04,774 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 22:03:04,774 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-18 22:03:04,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-18 22:03:04,775 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:04,775 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:04,775 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 22:03:04,776 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:04,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:04,776 INFO L82 PathProgramCache]: Analyzing trace with hash 1257217354, now seen corresponding path program 1 times [2020-08-18 22:03:04,776 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:04,777 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [184490267] [2020-08-18 22:03:04,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:04,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:04,984 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:04,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:04,988 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:04,989 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [184490267] [2020-08-18 22:03:04,989 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:04,989 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 22:03:04,990 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1909732531] [2020-08-18 22:03:04,990 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 22:03:04,990 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:04,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 22:03:04,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-18 22:03:04,991 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 7 states. [2020-08-18 22:03:05,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:05,106 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-18 22:03:05,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 22:03:05,107 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2020-08-18 22:03:05,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:05,107 INFO L225 Difference]: With dead ends: 26 [2020-08-18 22:03:05,108 INFO L226 Difference]: Without dead ends: 20 [2020-08-18 22:03:05,109 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-18 22:03:05,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-18 22:03:05,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-18 22:03:05,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-18 22:03:05,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-18 22:03:05,113 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 16 [2020-08-18 22:03:05,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:05,114 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-18 22:03:05,114 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 22:03:05,114 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-18 22:03:05,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-18 22:03:05,115 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:05,115 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:05,116 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 22:03:05,116 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:05,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:05,116 INFO L82 PathProgramCache]: Analyzing trace with hash -1335969749, now seen corresponding path program 2 times [2020-08-18 22:03:05,117 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:05,117 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1954256272] [2020-08-18 22:03:05,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:05,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:05,363 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:05,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:05,368 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:05,369 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1954256272] [2020-08-18 22:03:05,369 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:05,369 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 22:03:05,369 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1672698708] [2020-08-18 22:03:05,370 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 22:03:05,370 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:05,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 22:03:05,371 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-18 22:03:05,371 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 9 states. [2020-08-18 22:03:05,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:05,511 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-18 22:03:05,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 22:03:05,512 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-08-18 22:03:05,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:05,513 INFO L225 Difference]: With dead ends: 29 [2020-08-18 22:03:05,513 INFO L226 Difference]: Without dead ends: 23 [2020-08-18 22:03:05,514 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-08-18 22:03:05,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-18 22:03:05,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-18 22:03:05,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-18 22:03:05,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-18 22:03:05,519 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 19 [2020-08-18 22:03:05,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:05,519 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-18 22:03:05,519 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 22:03:05,520 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-18 22:03:05,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 22:03:05,520 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:05,520 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:05,521 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 22:03:05,521 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:05,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:05,521 INFO L82 PathProgramCache]: Analyzing trace with hash -1396202070, now seen corresponding path program 3 times [2020-08-18 22:03:05,522 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:05,522 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1018782806] [2020-08-18 22:03:05,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:05,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:05,821 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:05,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:05,827 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:05,827 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1018782806] [2020-08-18 22:03:05,828 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:05,828 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 22:03:05,828 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1521423451] [2020-08-18 22:03:05,829 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 22:03:05,829 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:05,829 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 22:03:05,829 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-18 22:03:05,830 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 11 states. [2020-08-18 22:03:10,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:10,265 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-18 22:03:10,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 22:03:10,266 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 22 [2020-08-18 22:03:10,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:10,267 INFO L225 Difference]: With dead ends: 32 [2020-08-18 22:03:10,267 INFO L226 Difference]: Without dead ends: 26 [2020-08-18 22:03:10,268 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=33, Invalid=148, Unknown=1, NotChecked=0, Total=182 [2020-08-18 22:03:10,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-18 22:03:10,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-18 22:03:10,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-18 22:03:10,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-18 22:03:10,277 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 22 [2020-08-18 22:03:10,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:10,277 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-18 22:03:10,278 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 22:03:10,279 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-18 22:03:10,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-18 22:03:10,281 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:10,281 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:10,281 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 22:03:10,282 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:10,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:10,282 INFO L82 PathProgramCache]: Analyzing trace with hash -480947253, now seen corresponding path program 4 times [2020-08-18 22:03:10,282 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:10,283 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [454072850] [2020-08-18 22:03:10,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:10,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:10,715 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:10,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:10,722 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:10,723 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [454072850] [2020-08-18 22:03:10,723 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:10,723 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 22:03:10,724 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1754565728] [2020-08-18 22:03:10,724 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 22:03:10,724 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:10,725 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 22:03:10,725 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-18 22:03:10,725 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 13 states. [2020-08-18 22:03:10,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:10,956 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-18 22:03:10,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 22:03:10,957 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 25 [2020-08-18 22:03:10,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:10,958 INFO L225 Difference]: With dead ends: 35 [2020-08-18 22:03:10,958 INFO L226 Difference]: Without dead ends: 29 [2020-08-18 22:03:10,959 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=37, Invalid=203, Unknown=0, NotChecked=0, Total=240 [2020-08-18 22:03:10,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-18 22:03:10,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-18 22:03:10,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 22:03:10,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-18 22:03:10,970 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 25 [2020-08-18 22:03:10,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:10,970 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-18 22:03:10,970 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 22:03:10,970 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-18 22:03:10,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 22:03:10,974 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:10,974 INFO L422 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:10,974 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 22:03:10,974 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:10,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:10,975 INFO L82 PathProgramCache]: Analyzing trace with hash 1422910986, now seen corresponding path program 5 times [2020-08-18 22:03:10,975 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:10,976 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1810048505] [2020-08-18 22:03:10,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:11,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:11,397 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:11,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:11,403 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:11,403 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1810048505] [2020-08-18 22:03:11,404 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:11,404 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 22:03:11,408 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [950029543] [2020-08-18 22:03:11,409 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 22:03:11,410 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:11,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 22:03:11,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-08-18 22:03:11,412 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 15 states. [2020-08-18 22:03:15,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:15,814 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-18 22:03:15,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 22:03:15,814 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 28 [2020-08-18 22:03:15,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:15,815 INFO L225 Difference]: With dead ends: 38 [2020-08-18 22:03:15,815 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 22:03:15,816 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=41, Invalid=265, Unknown=0, NotChecked=0, Total=306 [2020-08-18 22:03:15,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 22:03:15,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-18 22:03:15,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-18 22:03:15,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-18 22:03:15,826 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 28 [2020-08-18 22:03:15,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:15,826 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-18 22:03:15,826 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 22:03:15,826 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-18 22:03:15,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-18 22:03:15,827 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:15,827 INFO L422 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:15,830 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 22:03:15,830 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:15,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:15,831 INFO L82 PathProgramCache]: Analyzing trace with hash -74401941, now seen corresponding path program 6 times [2020-08-18 22:03:15,839 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:15,839 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [275836867] [2020-08-18 22:03:15,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:15,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:16,288 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:16,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:16,293 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:16,294 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [275836867] [2020-08-18 22:03:16,294 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:16,294 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 22:03:16,295 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [945814213] [2020-08-18 22:03:16,295 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 22:03:16,295 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:16,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 22:03:16,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-18 22:03:16,296 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 17 states. [2020-08-18 22:03:22,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:22,919 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-18 22:03:22,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 22:03:22,922 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 31 [2020-08-18 22:03:22,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:22,924 INFO L225 Difference]: With dead ends: 41 [2020-08-18 22:03:22,924 INFO L226 Difference]: Without dead ends: 35 [2020-08-18 22:03:22,924 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=45, Invalid=334, Unknown=1, NotChecked=0, Total=380 [2020-08-18 22:03:22,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-18 22:03:22,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-18 22:03:22,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 22:03:22,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-18 22:03:22,929 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 31 [2020-08-18 22:03:22,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:22,929 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-18 22:03:22,929 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 22:03:22,930 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-18 22:03:22,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 22:03:22,931 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:22,931 INFO L422 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:22,931 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 22:03:22,931 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:22,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:22,932 INFO L82 PathProgramCache]: Analyzing trace with hash 1006526058, now seen corresponding path program 7 times [2020-08-18 22:03:22,932 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:22,932 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1401526617] [2020-08-18 22:03:22,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:22,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:23,470 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:23,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:23,476 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:23,477 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1401526617] [2020-08-18 22:03:23,477 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:23,477 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 22:03:23,477 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2023246621] [2020-08-18 22:03:23,477 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 22:03:23,478 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:23,478 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 22:03:23,478 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-08-18 22:03:23,478 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 19 states. [2020-08-18 22:03:34,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:34,238 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-18 22:03:34,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 22:03:34,238 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 34 [2020-08-18 22:03:34,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:34,241 INFO L225 Difference]: With dead ends: 44 [2020-08-18 22:03:34,241 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 22:03:34,242 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=49, Invalid=412, Unknown=1, NotChecked=0, Total=462 [2020-08-18 22:03:34,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 22:03:34,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-18 22:03:34,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-18 22:03:34,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-18 22:03:34,249 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 34 [2020-08-18 22:03:34,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:34,249 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-18 22:03:34,249 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 22:03:34,249 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-18 22:03:34,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-18 22:03:34,250 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:34,250 INFO L422 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:34,251 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 22:03:34,251 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:34,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:34,251 INFO L82 PathProgramCache]: Analyzing trace with hash -732241141, now seen corresponding path program 8 times [2020-08-18 22:03:34,251 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:34,252 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1162958414] [2020-08-18 22:03:34,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:34,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:34,884 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:34,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:34,892 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:34,892 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1162958414] [2020-08-18 22:03:34,892 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:34,893 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 22:03:34,893 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1539058710] [2020-08-18 22:03:34,893 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 22:03:34,893 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:34,894 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 22:03:34,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-08-18 22:03:34,894 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 21 states. [2020-08-18 22:03:35,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:35,357 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-18 22:03:35,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 22:03:35,358 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 37 [2020-08-18 22:03:35,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:35,359 INFO L225 Difference]: With dead ends: 47 [2020-08-18 22:03:35,360 INFO L226 Difference]: Without dead ends: 41 [2020-08-18 22:03:35,360 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=53, Invalid=499, Unknown=0, NotChecked=0, Total=552 [2020-08-18 22:03:35,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-18 22:03:35,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-18 22:03:35,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 22:03:35,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-18 22:03:35,365 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 37 [2020-08-18 22:03:35,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:35,365 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-18 22:03:35,365 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 22:03:35,366 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-18 22:03:35,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-18 22:03:35,366 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:35,367 INFO L422 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:35,367 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 22:03:35,367 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:35,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:35,367 INFO L82 PathProgramCache]: Analyzing trace with hash 1254690506, now seen corresponding path program 9 times [2020-08-18 22:03:35,368 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:35,368 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1606491046] [2020-08-18 22:03:35,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:35,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:36,098 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:36,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:36,104 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:36,105 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1606491046] [2020-08-18 22:03:36,105 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:36,105 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 22:03:36,105 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [489375870] [2020-08-18 22:03:36,106 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 22:03:36,106 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:36,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 22:03:36,107 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-08-18 22:03:36,107 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 23 states. [2020-08-18 22:03:49,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:49,120 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-18 22:03:49,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 22:03:49,121 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 40 [2020-08-18 22:03:49,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:49,123 INFO L225 Difference]: With dead ends: 50 [2020-08-18 22:03:49,123 INFO L226 Difference]: Without dead ends: 44 [2020-08-18 22:03:49,124 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=57, Invalid=591, Unknown=2, NotChecked=0, Total=650 [2020-08-18 22:03:49,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-18 22:03:49,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-18 22:03:49,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-18 22:03:49,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-18 22:03:49,129 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 40 [2020-08-18 22:03:49,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:49,129 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-18 22:03:49,129 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 22:03:49,129 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-18 22:03:49,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-18 22:03:49,130 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:49,130 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:49,130 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 22:03:49,131 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:49,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:49,131 INFO L82 PathProgramCache]: Analyzing trace with hash 696112811, now seen corresponding path program 10 times [2020-08-18 22:03:49,131 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:49,132 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1260488690] [2020-08-18 22:03:49,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:49,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:50,011 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:50,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:50,022 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:50,023 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1260488690] [2020-08-18 22:03:50,023 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:50,023 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 22:03:50,023 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1201344695] [2020-08-18 22:03:50,025 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 22:03:50,026 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:50,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 22:03:50,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-08-18 22:03:50,027 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 25 states. [2020-08-18 22:04:15,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:04:15,667 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-18 22:04:15,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 22:04:15,667 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 43 [2020-08-18 22:04:15,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:04:15,668 INFO L225 Difference]: With dead ends: 53 [2020-08-18 22:04:15,668 INFO L226 Difference]: Without dead ends: 47 [2020-08-18 22:04:15,669 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 11.3s TimeCoverageRelationStatistics Valid=61, Invalid=690, Unknown=5, NotChecked=0, Total=756 [2020-08-18 22:04:15,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-18 22:04:15,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-18 22:04:15,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-18 22:04:15,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-18 22:04:15,673 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 43 [2020-08-18 22:04:15,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:04:15,674 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-18 22:04:15,674 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 22:04:15,674 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-18 22:04:15,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-18 22:04:15,675 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:04:15,675 INFO L422 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:04:15,675 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 22:04:15,675 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:04:15,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:04:15,676 INFO L82 PathProgramCache]: Analyzing trace with hash -1188694230, now seen corresponding path program 11 times [2020-08-18 22:04:15,676 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:04:15,676 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [241245072] [2020-08-18 22:04:15,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:04:15,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:04:16,621 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:04:16,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:04:16,631 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:04:16,632 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [241245072] [2020-08-18 22:04:16,632 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:04:16,632 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 22:04:16,632 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [77460616] [2020-08-18 22:04:16,634 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 22:04:16,634 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:04:16,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 22:04:16,635 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2020-08-18 22:04:16,635 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 27 states.