/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 false -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive/Ackermann01-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 15:26:09,421 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 15:26:09,424 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 15:26:09,466 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-08-18 15:26:09,491 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 15:26:09,493 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 15:26:09,497 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 15:26:09,498 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 15:26:09,499 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 15:26:09,505 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 15:26:09,508 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 15:26:09,510 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 15:26:09,512 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 15:26:09,513 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 15:26:09,514 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 15:26:09,515 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 15:26:09,517 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 15:26:09,525 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 15:26:09,526 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 15:26:09,527 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 15:26:09,527 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 15:26:09,549 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 15:26:09,550 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 15:26:09,551 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 15:26:09,551 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 15:26:09,551 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 15:26:09,552 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 15:26:09,552 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 15:26:09,552 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 15:26:09,552 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 15:26:09,553 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 15:26:09,553 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 15:26:09,553 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 15:26:09,553 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 15:26:09,553 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 15:26:09,554 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 15:26:09,554 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 15:26:09,554 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 15:26:09,554 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 15:26:09,554 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 15:26:09,555 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 15:26:09,555 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 15:26:09,555 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 15:26:09,555 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 15:26:09,555 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 15:26:09,556 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 15:26:09,556 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 15:26:09,556 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 15:26:09,556 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 15:26:09,556 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 15:26:09,557 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 -> false [2020-08-18 15:26:09,854 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 15:26:09,866 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 15:26:09,869 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 15:26:09,871 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 15:26:09,872 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 15:26:09,873 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Ackermann01-2.c [2020-08-18 15:26:09,953 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/654f4b4b4/112a54bacf064fc188fac4c163333094/FLAG340fb3ff3 [2020-08-18 15:26:10,420 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 15:26:10,423 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive/Ackermann01-2.c [2020-08-18 15:26:10,429 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/654f4b4b4/112a54bacf064fc188fac4c163333094/FLAG340fb3ff3 [2020-08-18 15:26:10,787 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/654f4b4b4/112a54bacf064fc188fac4c163333094 [2020-08-18 15:26:10,797 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 15:26:10,799 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 15:26:10,800 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 15:26:10,800 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 15:26:10,804 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 15:26:10,806 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 03:26:10" (1/1) ... [2020-08-18 15:26:10,809 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2584cbd4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:26:10, skipping insertion in model container [2020-08-18 15:26:10,810 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 03:26:10" (1/1) ... [2020-08-18 15:26:10,819 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 15:26:10,839 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 15:26:11,014 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 15:26:11,019 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 15:26:11,038 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 15:26:11,054 INFO L208 MainTranslator]: Completed translation [2020-08-18 15:26:11,055 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:26:11 WrapperNode [2020-08-18 15:26:11,055 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 15:26:11,056 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 15:26:11,056 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 15:26:11,056 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 15:26:11,071 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:26:11" (1/1) ... [2020-08-18 15:26:11,071 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:26:11" (1/1) ... [2020-08-18 15:26:11,154 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:26:11" (1/1) ... [2020-08-18 15:26:11,154 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:26:11" (1/1) ... [2020-08-18 15:26:11,162 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:26:11" (1/1) ... [2020-08-18 15:26:11,165 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:26:11" (1/1) ... [2020-08-18 15:26:11,167 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:26:11" (1/1) ... [2020-08-18 15:26:11,174 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 15:26:11,175 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 15:26:11,175 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 15:26:11,175 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 15:26:11,176 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:26:11" (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 15:26:11,242 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 15:26:11,243 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 15:26:11,243 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2020-08-18 15:26:11,243 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 15:26:11,243 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 15:26:11,243 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-18 15:26:11,243 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2020-08-18 15:26:11,244 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 15:26:11,244 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 15:26:11,244 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 15:26:11,446 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 15:26:11,446 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-18 15:26:11,460 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 03:26:11 BoogieIcfgContainer [2020-08-18 15:26:11,460 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 15:26:11,462 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 15:26:11,462 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 15:26:11,468 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 15:26:11,474 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 03:26:10" (1/3) ... [2020-08-18 15:26:11,475 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61b05ddf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 03:26:11, skipping insertion in model container [2020-08-18 15:26:11,475 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 03:26:11" (2/3) ... [2020-08-18 15:26:11,476 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@61b05ddf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 03:26:11, skipping insertion in model container [2020-08-18 15:26:11,476 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 03:26:11" (3/3) ... [2020-08-18 15:26:11,485 INFO L109 eAbstractionObserver]: Analyzing ICFG Ackermann01-2.c [2020-08-18 15:26:11,515 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 15:26:11,525 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 15:26:11,552 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 15:26:11,597 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 15:26:11,598 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 15:26:11,598 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 15:26:11,598 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 15:26:11,598 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 15:26:11,599 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 15:26:11,599 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 15:26:11,599 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 15:26:11,616 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2020-08-18 15:26:11,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-18 15:26:11,623 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:26:11,624 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:26:11,625 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:26:11,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:26:11,631 INFO L82 PathProgramCache]: Analyzing trace with hash -1796234678, now seen corresponding path program 1 times [2020-08-18 15:26:11,638 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:26:11,639 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [955372712] [2020-08-18 15:26:11,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:26:11,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:11,847 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:26:11,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:11,852 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-18 15:26:11,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:11,913 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 15:26:11,914 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [955372712] [2020-08-18 15:26:11,917 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 15:26:11,917 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-08-18 15:26:11,918 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1971305854] [2020-08-18 15:26:11,923 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 15:26:11,924 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:26:11,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 15:26:11,938 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-18 15:26:11,941 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 7 states. [2020-08-18 15:26:12,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:26:12,137 INFO L93 Difference]: Finished difference Result 41 states and 51 transitions. [2020-08-18 15:26:12,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 15:26:12,139 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 15 [2020-08-18 15:26:12,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:26:12,152 INFO L225 Difference]: With dead ends: 41 [2020-08-18 15:26:12,152 INFO L226 Difference]: Without dead ends: 25 [2020-08-18 15:26:12,156 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-08-18 15:26:12,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-18 15:26:12,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-18 15:26:12,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-18 15:26:12,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 31 transitions. [2020-08-18 15:26:12,208 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 31 transitions. Word has length 15 [2020-08-18 15:26:12,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:26:12,209 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 31 transitions. [2020-08-18 15:26:12,209 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 15:26:12,209 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 31 transitions. [2020-08-18 15:26:12,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 15:26:12,212 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:26:12,212 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 15:26:12,213 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 15:26:12,213 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:26:12,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:26:12,214 INFO L82 PathProgramCache]: Analyzing trace with hash -895156504, now seen corresponding path program 1 times [2020-08-18 15:26:12,214 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:26:12,215 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1633927996] [2020-08-18 15:26:12,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:26:12,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:12,291 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:26:12,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:12,299 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-18 15:26:12,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:12,364 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 15:26:12,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:12,427 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 15:26:12,427 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1633927996] [2020-08-18 15:26:12,428 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 15:26:12,428 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-08-18 15:26:12,428 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [639164382] [2020-08-18 15:26:12,430 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 15:26:12,430 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:26:12,431 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 15:26:12,431 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-08-18 15:26:12,431 INFO L87 Difference]: Start difference. First operand 25 states and 31 transitions. Second operand 8 states. [2020-08-18 15:26:12,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:26:12,606 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2020-08-18 15:26:12,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 15:26:12,607 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 22 [2020-08-18 15:26:12,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:26:12,609 INFO L225 Difference]: With dead ends: 32 [2020-08-18 15:26:12,609 INFO L226 Difference]: Without dead ends: 28 [2020-08-18 15:26:12,611 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2020-08-18 15:26:12,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-18 15:26:12,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-08-18 15:26:12,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-18 15:26:12,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 32 transitions. [2020-08-18 15:26:12,621 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 32 transitions. Word has length 22 [2020-08-18 15:26:12,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:26:12,621 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 32 transitions. [2020-08-18 15:26:12,622 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 15:26:12,622 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 32 transitions. [2020-08-18 15:26:12,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 15:26:12,624 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:26:12,624 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:26:12,624 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 15:26:12,625 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:26:12,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:26:12,625 INFO L82 PathProgramCache]: Analyzing trace with hash 408363011, now seen corresponding path program 1 times [2020-08-18 15:26:12,625 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:26:12,626 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2022998609] [2020-08-18 15:26:12,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:26:12,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:12,659 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:26:12,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:12,662 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-18 15:26:12,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:12,736 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 15:26:12,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:12,759 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-08-18 15:26:12,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:12,766 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-08-18 15:26:12,766 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2022998609] [2020-08-18 15:26:12,766 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:26:12,767 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 15:26:12,767 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1584766265] [2020-08-18 15:26:12,768 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 15:26:12,768 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:26:12,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 15:26:12,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 15:26:12,769 INFO L87 Difference]: Start difference. First operand 26 states and 32 transitions. Second operand 5 states. [2020-08-18 15:26:12,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:26:12,835 INFO L93 Difference]: Finished difference Result 46 states and 63 transitions. [2020-08-18 15:26:12,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 15:26:12,835 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 28 [2020-08-18 15:26:12,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:26:12,837 INFO L225 Difference]: With dead ends: 46 [2020-08-18 15:26:12,837 INFO L226 Difference]: Without dead ends: 28 [2020-08-18 15:26:12,838 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-18 15:26:12,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-18 15:26:12,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-18 15:26:12,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-18 15:26:12,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 35 transitions. [2020-08-18 15:26:12,848 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 35 transitions. Word has length 28 [2020-08-18 15:26:12,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:26:12,848 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 35 transitions. [2020-08-18 15:26:12,849 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 15:26:12,849 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 35 transitions. [2020-08-18 15:26:12,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-18 15:26:12,851 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:26:12,851 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:26:12,851 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 15:26:12,852 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:26:12,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:26:12,852 INFO L82 PathProgramCache]: Analyzing trace with hash 718507263, now seen corresponding path program 1 times [2020-08-18 15:26:12,852 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:26:12,853 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1325361762] [2020-08-18 15:26:12,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:26:12,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:12,913 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:26:12,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:12,915 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-18 15:26:12,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:12,998 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 15:26:13,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:13,037 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 15:26:13,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:13,086 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2020-08-18 15:26:13,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:13,127 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 13 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-08-18 15:26:13,127 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1325361762] [2020-08-18 15:26:13,128 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:26:13,128 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 15:26:13,128 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [239235010] [2020-08-18 15:26:13,129 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 15:26:13,129 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:26:13,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 15:26:13,130 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2020-08-18 15:26:13,130 INFO L87 Difference]: Start difference. First operand 28 states and 35 transitions. Second operand 13 states. [2020-08-18 15:26:13,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:26:13,645 INFO L93 Difference]: Finished difference Result 54 states and 87 transitions. [2020-08-18 15:26:13,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 15:26:13,646 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 35 [2020-08-18 15:26:13,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:26:13,651 INFO L225 Difference]: With dead ends: 54 [2020-08-18 15:26:13,651 INFO L226 Difference]: Without dead ends: 50 [2020-08-18 15:26:13,652 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=110, Invalid=442, Unknown=0, NotChecked=0, Total=552 [2020-08-18 15:26:13,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-18 15:26:13,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 36. [2020-08-18 15:26:13,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-18 15:26:13,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 53 transitions. [2020-08-18 15:26:13,669 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 53 transitions. Word has length 35 [2020-08-18 15:26:13,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:26:13,670 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 53 transitions. [2020-08-18 15:26:13,670 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 15:26:13,670 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 53 transitions. [2020-08-18 15:26:13,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-18 15:26:13,672 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:26:13,672 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:26:13,673 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 15:26:13,673 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:26:13,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:26:13,674 INFO L82 PathProgramCache]: Analyzing trace with hash -1711672813, now seen corresponding path program 2 times [2020-08-18 15:26:13,674 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:26:13,674 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [123516733] [2020-08-18 15:26:13,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:26:13,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:13,719 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:26:13,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:13,721 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-18 15:26:13,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:13,756 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 15:26:13,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:13,808 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 15:26:13,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:13,839 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 15:26:13,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:13,881 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2020-08-18 15:26:13,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:13,915 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 20 proven. 6 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2020-08-18 15:26:13,916 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [123516733] [2020-08-18 15:26:13,916 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:26:13,916 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 15:26:13,917 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [157998418] [2020-08-18 15:26:13,917 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 15:26:13,917 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:26:13,918 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 15:26:13,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2020-08-18 15:26:13,918 INFO L87 Difference]: Start difference. First operand 36 states and 53 transitions. Second operand 14 states. [2020-08-18 15:26:14,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:26:14,370 INFO L93 Difference]: Finished difference Result 65 states and 116 transitions. [2020-08-18 15:26:14,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 15:26:14,371 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 42 [2020-08-18 15:26:14,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:26:14,374 INFO L225 Difference]: With dead ends: 65 [2020-08-18 15:26:14,374 INFO L226 Difference]: Without dead ends: 61 [2020-08-18 15:26:14,376 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=122, Invalid=528, Unknown=0, NotChecked=0, Total=650 [2020-08-18 15:26:14,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-18 15:26:14,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 34. [2020-08-18 15:26:14,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-18 15:26:14,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 47 transitions. [2020-08-18 15:26:14,393 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 47 transitions. Word has length 42 [2020-08-18 15:26:14,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:26:14,393 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 47 transitions. [2020-08-18 15:26:14,394 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 15:26:14,394 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 47 transitions. [2020-08-18 15:26:14,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-18 15:26:14,396 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:26:14,396 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:26:14,396 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 15:26:14,396 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:26:14,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:26:14,397 INFO L82 PathProgramCache]: Analyzing trace with hash -1051926487, now seen corresponding path program 3 times [2020-08-18 15:26:14,397 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:26:14,398 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1176295264] [2020-08-18 15:26:14,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:26:14,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:14,450 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:26:14,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:14,453 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-18 15:26:14,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:14,488 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 15:26:14,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:14,508 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 15:26:14,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:14,519 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2020-08-18 15:26:14,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:14,533 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 15:26:14,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:14,542 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-08-18 15:26:14,543 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1176295264] [2020-08-18 15:26:14,543 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:26:14,543 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 15:26:14,543 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1123975893] [2020-08-18 15:26:14,544 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 15:26:14,544 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:26:14,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 15:26:14,545 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-18 15:26:14,545 INFO L87 Difference]: Start difference. First operand 34 states and 47 transitions. Second operand 7 states. [2020-08-18 15:26:14,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:26:14,666 INFO L93 Difference]: Finished difference Result 75 states and 128 transitions. [2020-08-18 15:26:14,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 15:26:14,667 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 42 [2020-08-18 15:26:14,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:26:14,669 INFO L225 Difference]: With dead ends: 75 [2020-08-18 15:26:14,669 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 15:26:14,671 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2020-08-18 15:26:14,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 15:26:14,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-18 15:26:14,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 15:26:14,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 74 transitions. [2020-08-18 15:26:14,697 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 74 transitions. Word has length 42 [2020-08-18 15:26:14,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:26:14,697 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 74 transitions. [2020-08-18 15:26:14,697 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 15:26:14,698 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 74 transitions. [2020-08-18 15:26:14,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-18 15:26:14,703 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:26:14,703 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 5, 4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:26:14,704 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 15:26:14,709 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:26:14,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:26:14,709 INFO L82 PathProgramCache]: Analyzing trace with hash 579008339, now seen corresponding path program 4 times [2020-08-18 15:26:14,710 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:26:14,710 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1738347739] [2020-08-18 15:26:14,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:26:14,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:14,750 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:26:14,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:14,752 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-18 15:26:14,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:14,769 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 15:26:14,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:14,779 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 15:26:14,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:14,800 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 15:26:14,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:14,806 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-18 15:26:14,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:14,813 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 15:26:14,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:14,818 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 15:26:14,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:14,826 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 22 proven. 24 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2020-08-18 15:26:14,827 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1738347739] [2020-08-18 15:26:14,827 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:26:14,827 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-18 15:26:14,827 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1245174667] [2020-08-18 15:26:14,828 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 15:26:14,828 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:26:14,828 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 15:26:14,829 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 15:26:14,829 INFO L87 Difference]: Start difference. First operand 49 states and 74 transitions. Second operand 4 states. [2020-08-18 15:26:14,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:26:14,885 INFO L93 Difference]: Finished difference Result 91 states and 165 transitions. [2020-08-18 15:26:14,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 15:26:14,889 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 56 [2020-08-18 15:26:14,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:26:14,890 INFO L225 Difference]: With dead ends: 91 [2020-08-18 15:26:14,890 INFO L226 Difference]: Without dead ends: 50 [2020-08-18 15:26:14,896 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 15:26:14,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-18 15:26:14,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-08-18 15:26:14,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-18 15:26:14,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 76 transitions. [2020-08-18 15:26:14,917 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 76 transitions. Word has length 56 [2020-08-18 15:26:14,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:26:14,917 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 76 transitions. [2020-08-18 15:26:14,918 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 15:26:14,918 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 76 transitions. [2020-08-18 15:26:14,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-18 15:26:14,922 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 15:26:14,922 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 5, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 15:26:14,922 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 15:26:14,923 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 15:26:14,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 15:26:14,923 INFO L82 PathProgramCache]: Analyzing trace with hash -1732137516, now seen corresponding path program 5 times [2020-08-18 15:26:14,923 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 15:26:14,923 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1428997072] [2020-08-18 15:26:14,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 15:26:14,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:14,963 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 15:26:14,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:14,966 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-18 15:26:14,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:14,996 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 15:26:15,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:15,034 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 15:26:15,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:15,073 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 15:26:15,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:15,102 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 15:26:15,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:15,153 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2020-08-18 15:26:15,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:15,189 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 36 [2020-08-18 15:26:15,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:15,207 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 15:26:15,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 15:26:15,222 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 54 proven. 29 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2020-08-18 15:26:15,223 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1428997072] [2020-08-18 15:26:15,231 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 15:26:15,231 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 15:26:15,231 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2047228527] [2020-08-18 15:26:15,233 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 15:26:15,233 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 15:26:15,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 15:26:15,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=149, Unknown=0, NotChecked=0, Total=182 [2020-08-18 15:26:15,234 INFO L87 Difference]: Start difference. First operand 50 states and 76 transitions. Second operand 14 states. [2020-08-18 15:26:15,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 15:26:15,737 INFO L93 Difference]: Finished difference Result 95 states and 184 transitions. [2020-08-18 15:26:15,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 15:26:15,737 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 62 [2020-08-18 15:26:15,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 15:26:15,738 INFO L225 Difference]: With dead ends: 95 [2020-08-18 15:26:15,739 INFO L226 Difference]: Without dead ends: 0 [2020-08-18 15:26:15,741 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 146 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=219, Invalid=773, Unknown=0, NotChecked=0, Total=992 [2020-08-18 15:26:15,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-08-18 15:26:15,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-08-18 15:26:15,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-08-18 15:26:15,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-08-18 15:26:15,742 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 62 [2020-08-18 15:26:15,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 15:26:15,742 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-08-18 15:26:15,742 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 15:26:15,742 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-08-18 15:26:15,743 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-08-18 15:26:15,743 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 15:26:15,745 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-08-18 15:26:16,141 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 25 [2020-08-18 15:26:16,197 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-08-18 15:26:16,197 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-08-18 15:26:16,197 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-08-18 15:26:16,198 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-08-18 15:26:16,198 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-08-18 15:26:16,198 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-08-18 15:26:16,199 INFO L268 CegarLoopResult]: For program point ackermannEXIT(lines 15 23) no Hoare annotation was computed. [2020-08-18 15:26:16,199 INFO L264 CegarLoopResult]: At program point L22(line 22) the Hoare annotation is: (and (not (= ackermann_~m 0)) (= ackermann_~m |ackermann_#in~m|) (= ackermann_~n |ackermann_#in~n|)) [2020-08-18 15:26:16,202 INFO L271 CegarLoopResult]: At program point ackermannENTRY(lines 15 23) the Hoare annotation is: true [2020-08-18 15:26:16,202 INFO L268 CegarLoopResult]: For program point L22-1(line 22) no Hoare annotation was computed. [2020-08-18 15:26:16,202 INFO L264 CegarLoopResult]: At program point L20(line 20) the Hoare annotation is: (and (= |ackermann_#in~n| 0) (not (= ackermann_~m 0)) (= ackermann_~m |ackermann_#in~m|) (= ackermann_~n |ackermann_#in~n|)) [2020-08-18 15:26:16,203 INFO L264 CegarLoopResult]: At program point L22-2(line 22) the Hoare annotation is: (let ((.cse3 (<= 3 |ackermann_#t~ret1|))) (and (let ((.cse0 (= ackermann_~n |ackermann_#in~n|)) (.cse1 (<= 1 |ackermann_#in~m|)) (.cse2 (= ackermann_~m |ackermann_#in~m|))) (or (and (<= 2 |ackermann_#t~ret1|) (<= ackermann_~m 1) .cse0 .cse1 .cse2) (and .cse3 .cse0 .cse1 .cse2))) (or (= |ackermann_#in~n| 1) .cse3 (and (<= 2 |ackermann_#res|) (<= (+ |ackermann_#in~n| 1) |ackermann_#res|))))) [2020-08-18 15:26:16,203 INFO L268 CegarLoopResult]: For program point L19(lines 19 21) no Hoare annotation was computed. [2020-08-18 15:26:16,203 INFO L268 CegarLoopResult]: For program point L20-1(line 20) no Hoare annotation was computed. [2020-08-18 15:26:16,203 INFO L268 CegarLoopResult]: For program point L22-3(line 22) no Hoare annotation was computed. [2020-08-18 15:26:16,203 INFO L268 CegarLoopResult]: For program point L16(lines 16 18) no Hoare annotation was computed. [2020-08-18 15:26:16,204 INFO L268 CegarLoopResult]: For program point ackermannFINAL(lines 15 23) no Hoare annotation was computed. [2020-08-18 15:26:16,207 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 44) no Hoare annotation was computed. [2020-08-18 15:26:16,208 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 26 46) the Hoare annotation is: true [2020-08-18 15:26:16,208 INFO L268 CegarLoopResult]: For program point L28(lines 28 32) no Hoare annotation was computed. [2020-08-18 15:26:16,208 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 26 46) no Hoare annotation was computed. [2020-08-18 15:26:16,208 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 26 46) no Hoare annotation was computed. [2020-08-18 15:26:16,208 INFO L268 CegarLoopResult]: For program point L44(line 44) no Hoare annotation was computed. [2020-08-18 15:26:16,208 INFO L268 CegarLoopResult]: For program point L41(lines 41 45) no Hoare annotation was computed. [2020-08-18 15:26:16,209 INFO L264 CegarLoopResult]: At program point L40(line 40) the Hoare annotation is: (<= 0 main_~n~0) [2020-08-18 15:26:16,209 INFO L268 CegarLoopResult]: For program point L40-1(line 40) no Hoare annotation was computed. [2020-08-18 15:26:16,209 INFO L268 CegarLoopResult]: For program point L34(lines 34 39) no Hoare annotation was computed. [2020-08-18 15:26:16,220 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.08 03:26:16 BoogieIcfgContainer [2020-08-18 15:26:16,220 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-18 15:26:16,228 INFO L168 Benchmark]: Toolchain (without parser) took 5423.48 ms. Allocated memory was 140.0 MB in the beginning and 278.9 MB in the end (delta: 138.9 MB). Free memory was 102.8 MB in the beginning and 150.7 MB in the end (delta: -47.9 MB). Peak memory consumption was 91.0 MB. Max. memory is 7.1 GB. [2020-08-18 15:26:16,230 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 140.0 MB. Free memory was 121.5 MB in the beginning and 121.3 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-18 15:26:16,231 INFO L168 Benchmark]: CACSL2BoogieTranslator took 255.38 ms. Allocated memory is still 140.0 MB. Free memory was 102.6 MB in the beginning and 92.5 MB in the end (delta: 10.0 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. [2020-08-18 15:26:16,232 INFO L168 Benchmark]: Boogie Preprocessor took 118.74 ms. Allocated memory was 140.0 MB in the beginning and 202.4 MB in the end (delta: 62.4 MB). Free memory was 92.5 MB in the beginning and 180.5 MB in the end (delta: -87.9 MB). Peak memory consumption was 12.8 MB. Max. memory is 7.1 GB. [2020-08-18 15:26:16,233 INFO L168 Benchmark]: RCFGBuilder took 285.50 ms. Allocated memory is still 202.4 MB. Free memory was 180.5 MB in the beginning and 168.0 MB in the end (delta: 12.4 MB). Peak memory consumption was 12.4 MB. Max. memory is 7.1 GB. [2020-08-18 15:26:16,237 INFO L168 Benchmark]: TraceAbstraction took 4758.42 ms. Allocated memory was 202.4 MB in the beginning and 278.9 MB in the end (delta: 76.5 MB). Free memory was 167.4 MB in the beginning and 150.7 MB in the end (delta: 16.7 MB). Peak memory consumption was 93.3 MB. Max. memory is 7.1 GB. [2020-08-18 15:26:16,251 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 140.0 MB. Free memory was 121.5 MB in the beginning and 121.3 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 255.38 ms. Allocated memory is still 140.0 MB. Free memory was 102.6 MB in the beginning and 92.5 MB in the end (delta: 10.0 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 118.74 ms. Allocated memory was 140.0 MB in the beginning and 202.4 MB in the end (delta: 62.4 MB). Free memory was 92.5 MB in the beginning and 180.5 MB in the end (delta: -87.9 MB). Peak memory consumption was 12.8 MB. Max. memory is 7.1 GB. * RCFGBuilder took 285.50 ms. Allocated memory is still 202.4 MB. Free memory was 180.5 MB in the beginning and 168.0 MB in the end (delta: 12.4 MB). Peak memory consumption was 12.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 4758.42 ms. Allocated memory was 202.4 MB in the beginning and 278.9 MB in the end (delta: 76.5 MB). Free memory was 167.4 MB in the beginning and 150.7 MB in the end (delta: 16.7 MB). Peak memory consumption was 93.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 44]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 27 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 4.1s, OverallIterations: 8, TraceHistogramMax: 8, AutomataDifference: 2.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.4s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 178 SDtfs, 136 SDslu, 703 SDs, 0 SdLazy, 1267 SolverSat, 203 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 216 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 272 ImplicationChecksByTransitivity, 1.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=50occurred in iteration=7, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 8 MinimizatonAttempts, 43 StatesRemovedByMinimization, 3 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 9 LocationsWithAnnotation, 125 PreInvPairs, 152 NumberOfFragments, 80 HoareAnnotationTreeSize, 125 FomulaSimplifications, 7084 FormulaSimplificationTreeSizeReduction, 0.1s HoareSimplificationTime, 9 FomulaSimplificationsInter, 222 FormulaSimplificationTreeSizeReductionInter, 0.2s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.4s InterpolantComputationTime, 302 NumberOfCodeBlocks, 302 NumberOfCodeBlocksAsserted, 8 NumberOfCheckSat, 294 ConstructedInterpolants, 0 QuantifiedInterpolants, 24252 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 8 InterpolantComputations, 2 PerfectInterpolantSequences, 294/369 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...