/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=SMALLEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_5-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 17:04:11,523 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 17:04:11,526 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 17:04:11,567 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-08-18 17:04:11,590 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 17:04:11,593 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 17:04:11,595 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 17:04:11,597 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 17:04:11,597 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 17:04:11,600 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 17:04:11,602 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 17:04:11,607 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 17:04:11,609 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 17:04:11,611 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 17:04:11,612 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 17:04:11,613 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 17:04:11,617 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 17:04:11,637 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 17:04:11,638 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 17:04:11,640 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 17:04:11,641 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 17:04:11,680 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 17:04:11,680 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 17:04:11,683 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 17:04:11,683 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 17:04:11,683 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 17:04:11,684 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 17:04:11,684 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 17:04:11,684 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 17:04:11,684 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 17:04:11,684 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 17:04:11,685 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 17:04:11,686 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 17:04:11,686 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 17:04:11,686 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 17:04:11,687 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 17:04:11,687 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 17:04:11,687 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 17:04:11,687 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 17:04:11,687 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 17:04:11,687 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 17:04:11,688 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 17:04:11,688 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 17:04:11,688 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 17:04:11,688 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 17:04:11,688 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 17:04:11,689 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 17:04:11,689 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 17:04:11,689 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 17:04:11,689 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 17:04:11,689 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=SMALLEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLEST; [2020-08-18 17:04:12,011 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 17:04:12,022 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 17:04:12,026 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 17:04:12,027 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 17:04:12,028 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 17:04:12,028 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_5-2.c [2020-08-18 17:04:12,099 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/1fe35035d/50ddb4b5e78945acb22f82913b2d8189/FLAG4940ac727 [2020-08-18 17:04:12,610 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 17:04:12,611 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/fibo_5-2.c [2020-08-18 17:04:12,622 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/1fe35035d/50ddb4b5e78945acb22f82913b2d8189/FLAG4940ac727 [2020-08-18 17:04:12,918 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/1fe35035d/50ddb4b5e78945acb22f82913b2d8189 [2020-08-18 17:04:12,930 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 17:04:12,932 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 17:04:12,934 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 17:04:12,935 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 17:04:12,939 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 17:04:12,940 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 05:04:12" (1/1) ... [2020-08-18 17:04:12,944 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@54535c98 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:04:12, skipping insertion in model container [2020-08-18 17:04:12,944 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 05:04:12" (1/1) ... [2020-08-18 17:04:12,953 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 17:04:12,973 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 17:04:13,155 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 17:04:13,164 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 17:04:13,186 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 17:04:13,202 INFO L208 MainTranslator]: Completed translation [2020-08-18 17:04:13,204 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:04:13 WrapperNode [2020-08-18 17:04:13,204 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 17:04:13,205 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 17:04:13,206 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 17:04:13,206 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 17:04:13,220 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:04:13" (1/1) ... [2020-08-18 17:04:13,222 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:04:13" (1/1) ... [2020-08-18 17:04:13,228 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:04:13" (1/1) ... [2020-08-18 17:04:13,228 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:04:13" (1/1) ... [2020-08-18 17:04:13,233 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:04:13" (1/1) ... [2020-08-18 17:04:13,236 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:04:13" (1/1) ... [2020-08-18 17:04:13,238 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:04:13" (1/1) ... [2020-08-18 17:04:13,239 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 17:04:13,240 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 17:04:13,240 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 17:04:13,240 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 17:04:13,241 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:04:13" (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 17:04:13,399 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 17:04:13,400 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 17:04:13,400 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-08-18 17:04:13,401 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 17:04:13,401 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-18 17:04:13,401 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 17:04:13,401 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-08-18 17:04:13,402 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 17:04:13,402 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 17:04:13,402 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 17:04:13,584 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 17:04:13,585 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-18 17:04:13,592 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 05:04:13 BoogieIcfgContainer [2020-08-18 17:04:13,592 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 17:04:13,594 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 17:04:13,595 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 17:04:13,599 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 17:04:13,599 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 05:04:12" (1/3) ... [2020-08-18 17:04:13,600 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1d9aefb5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 05:04:13, skipping insertion in model container [2020-08-18 17:04:13,600 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 05:04:13" (2/3) ... [2020-08-18 17:04:13,601 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1d9aefb5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 05:04:13, skipping insertion in model container [2020-08-18 17:04:13,601 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 05:04:13" (3/3) ... [2020-08-18 17:04:13,603 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_5-2.c [2020-08-18 17:04:13,614 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 17:04:13,624 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 17:04:13,638 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 17:04:13,670 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 17:04:13,670 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 17:04:13,672 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 17:04:13,672 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 17:04:13,673 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 17:04:13,673 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 17:04:13,673 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 17:04:13,673 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 17:04:13,689 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-08-18 17:04:13,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-18 17:04:13,694 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:04:13,695 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:04:13,696 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:04:13,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:04:13,701 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-08-18 17:04:13,707 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:04:13,708 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1615409430] [2020-08-18 17:04:13,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:04:13,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:13,873 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:04:13,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:13,883 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 17:04:13,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:14,109 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 17:04:14,110 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1615409430] [2020-08-18 17:04:14,114 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 17:04:14,115 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 17:04:14,116 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1443207034] [2020-08-18 17:04:14,127 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 17:04:14,127 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:04:14,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 17:04:14,144 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 17:04:14,146 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-08-18 17:04:14,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:04:14,257 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-08-18 17:04:14,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 17:04:14,259 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-18 17:04:14,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:04:14,270 INFO L225 Difference]: With dead ends: 35 [2020-08-18 17:04:14,271 INFO L226 Difference]: Without dead ends: 21 [2020-08-18 17:04:14,275 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 17:04:14,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-18 17:04:14,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-18 17:04:14,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-18 17:04:14,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-08-18 17:04:14,324 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-08-18 17:04:14,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:04:14,325 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-08-18 17:04:14,325 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 17:04:14,325 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-08-18 17:04:14,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-18 17:04:14,327 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:04:14,327 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:04:14,328 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 17:04:14,328 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:04:14,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:04:14,329 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-08-18 17:04:14,329 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:04:14,330 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1472272512] [2020-08-18 17:04:14,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:04:14,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:14,359 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:04:14,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:14,362 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 17:04:14,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:14,418 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 17:04:14,419 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1472272512] [2020-08-18 17:04:14,419 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 17:04:14,419 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 17:04:14,420 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [8100293] [2020-08-18 17:04:14,422 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 17:04:14,422 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:04:14,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 17:04:14,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 17:04:14,423 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-08-18 17:04:14,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:04:14,494 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-08-18 17:04:14,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 17:04:14,495 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-08-18 17:04:14,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:04:14,496 INFO L225 Difference]: With dead ends: 27 [2020-08-18 17:04:14,497 INFO L226 Difference]: Without dead ends: 23 [2020-08-18 17:04:14,498 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 17:04:14,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-18 17:04:14,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-08-18 17:04:14,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-18 17:04:14,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-08-18 17:04:14,507 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-08-18 17:04:14,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:04:14,507 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-08-18 17:04:14,508 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 17:04:14,508 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-08-18 17:04:14,509 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-18 17:04:14,509 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:04:14,510 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] [2020-08-18 17:04:14,510 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 17:04:14,510 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:04:14,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:04:14,511 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-08-18 17:04:14,511 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:04:14,512 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1426756516] [2020-08-18 17:04:14,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:04:14,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:14,561 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:04:14,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:14,565 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 17:04:14,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:14,638 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 17:04:14,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:14,684 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-08-18 17:04:14,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:14,693 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 17:04:14,694 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1426756516] [2020-08-18 17:04:14,694 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:04:14,694 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 17:04:14,695 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1546426316] [2020-08-18 17:04:14,695 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 17:04:14,696 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:04:14,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 17:04:14,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-18 17:04:14,697 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 7 states. [2020-08-18 17:04:14,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:04:14,802 INFO L93 Difference]: Finished difference Result 38 states and 49 transitions. [2020-08-18 17:04:14,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 17:04:14,803 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 26 [2020-08-18 17:04:14,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:04:14,805 INFO L225 Difference]: With dead ends: 38 [2020-08-18 17:04:14,805 INFO L226 Difference]: Without dead ends: 23 [2020-08-18 17:04:14,806 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2020-08-18 17:04:14,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-18 17:04:14,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-18 17:04:14,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-18 17:04:14,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2020-08-18 17:04:14,815 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 26 [2020-08-18 17:04:14,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:04:14,816 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2020-08-18 17:04:14,816 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 17:04:14,816 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2020-08-18 17:04:14,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-18 17:04:14,818 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:04:14,818 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] [2020-08-18 17:04:14,819 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 17:04:14,819 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:04:14,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:04:14,820 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-08-18 17:04:14,820 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:04:14,821 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [406085302] [2020-08-18 17:04:14,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:04:14,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:14,854 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:04:14,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:14,857 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 17:04:14,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:14,895 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 17:04:14,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:14,916 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-18 17:04:14,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:14,927 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 17:04:14,928 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [406085302] [2020-08-18 17:04:14,928 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:04:14,929 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 17:04:14,929 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1164947252] [2020-08-18 17:04:14,930 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 17:04:14,931 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:04:14,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 17:04:14,932 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-18 17:04:14,932 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand 6 states. [2020-08-18 17:04:15,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:04:15,053 INFO L93 Difference]: Finished difference Result 41 states and 55 transitions. [2020-08-18 17:04:15,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 17:04:15,053 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 27 [2020-08-18 17:04:15,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:04:15,056 INFO L225 Difference]: With dead ends: 41 [2020-08-18 17:04:15,056 INFO L226 Difference]: Without dead ends: 37 [2020-08-18 17:04:15,057 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2020-08-18 17:04:15,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-18 17:04:15,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-18 17:04:15,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 17:04:15,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 51 transitions. [2020-08-18 17:04:15,070 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 51 transitions. Word has length 27 [2020-08-18 17:04:15,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:04:15,070 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 51 transitions. [2020-08-18 17:04:15,071 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 17:04:15,071 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 51 transitions. [2020-08-18 17:04:15,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-18 17:04:15,073 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:04:15,073 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:04:15,074 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 17:04:15,074 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:04:15,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:04:15,074 INFO L82 PathProgramCache]: Analyzing trace with hash 146085807, now seen corresponding path program 2 times [2020-08-18 17:04:15,075 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:04:15,075 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [786381343] [2020-08-18 17:04:15,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:04:15,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:15,107 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:04:15,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:15,109 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 17:04:15,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:15,140 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 17:04:15,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:15,193 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 17:04:15,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:15,199 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-18 17:04:15,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:15,204 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-18 17:04:15,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:15,225 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 23 proven. 7 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-08-18 17:04:15,226 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [786381343] [2020-08-18 17:04:15,226 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:04:15,226 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 17:04:15,226 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1105303835] [2020-08-18 17:04:15,227 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 17:04:15,227 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:04:15,227 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 17:04:15,228 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-08-18 17:04:15,228 INFO L87 Difference]: Start difference. First operand 37 states and 51 transitions. Second operand 8 states. [2020-08-18 17:04:15,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:04:15,374 INFO L93 Difference]: Finished difference Result 79 states and 124 transitions. [2020-08-18 17:04:15,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 17:04:15,375 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 40 [2020-08-18 17:04:15,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:04:15,378 INFO L225 Difference]: With dead ends: 79 [2020-08-18 17:04:15,378 INFO L226 Difference]: Without dead ends: 48 [2020-08-18 17:04:15,379 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2020-08-18 17:04:15,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-18 17:04:15,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 42. [2020-08-18 17:04:15,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-18 17:04:15,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 57 transitions. [2020-08-18 17:04:15,392 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 57 transitions. Word has length 40 [2020-08-18 17:04:15,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:04:15,393 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 57 transitions. [2020-08-18 17:04:15,393 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 17:04:15,393 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 57 transitions. [2020-08-18 17:04:15,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 17:04:15,395 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:04:15,395 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:04:15,396 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 17:04:15,396 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:04:15,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:04:15,397 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 3 times [2020-08-18 17:04:15,397 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:04:15,397 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [616977967] [2020-08-18 17:04:15,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:04:15,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:15,426 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:04:15,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:15,428 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 17:04:15,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:15,461 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 17:04:15,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:15,490 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 17:04:15,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:15,507 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-18 17:04:15,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:15,512 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-18 17:04:15,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:15,520 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-08-18 17:04:15,520 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [616977967] [2020-08-18 17:04:15,521 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:04:15,521 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 17:04:15,521 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2145820888] [2020-08-18 17:04:15,522 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 17:04:15,522 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:04:15,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 17:04:15,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-18 17:04:15,523 INFO L87 Difference]: Start difference. First operand 42 states and 57 transitions. Second operand 7 states. [2020-08-18 17:04:15,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:04:15,632 INFO L93 Difference]: Finished difference Result 65 states and 93 transitions. [2020-08-18 17:04:15,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 17:04:15,633 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 41 [2020-08-18 17:04:15,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:04:15,635 INFO L225 Difference]: With dead ends: 65 [2020-08-18 17:04:15,635 INFO L226 Difference]: Without dead ends: 61 [2020-08-18 17:04:15,636 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2020-08-18 17:04:15,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-18 17:04:15,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 58. [2020-08-18 17:04:15,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-18 17:04:15,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 84 transitions. [2020-08-18 17:04:15,650 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 84 transitions. Word has length 41 [2020-08-18 17:04:15,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:04:15,650 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 84 transitions. [2020-08-18 17:04:15,650 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 17:04:15,651 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 84 transitions. [2020-08-18 17:04:15,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-18 17:04:15,653 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:04:15,653 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 9, 5, 5, 5, 5, 5, 5, 5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:04:15,654 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 17:04:15,654 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:04:15,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:04:15,654 INFO L82 PathProgramCache]: Analyzing trace with hash -1986920854, now seen corresponding path program 4 times [2020-08-18 17:04:15,655 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:04:15,655 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1821309661] [2020-08-18 17:04:15,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:04:15,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:15,699 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:04:15,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:15,701 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 17:04:15,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:15,736 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 17:04:15,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:15,767 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 17:04:15,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:15,788 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 17:04:15,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:15,805 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-18 17:04:15,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:15,811 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-18 17:04:15,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:15,816 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-08-18 17:04:15,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:15,844 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 17:04:15,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:15,888 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 17:04:15,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:15,895 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-18 17:04:15,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:15,899 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-18 17:04:15,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:15,940 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 77 proven. 104 refuted. 0 times theorem prover too weak. 115 trivial. 0 not checked. [2020-08-18 17:04:15,940 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1821309661] [2020-08-18 17:04:15,940 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:04:15,941 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 17:04:15,941 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1359233923] [2020-08-18 17:04:15,942 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 17:04:15,942 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:04:15,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 17:04:15,943 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2020-08-18 17:04:15,943 INFO L87 Difference]: Start difference. First operand 58 states and 84 transitions. Second operand 11 states. [2020-08-18 17:04:16,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:04:16,276 INFO L93 Difference]: Finished difference Result 107 states and 178 transitions. [2020-08-18 17:04:16,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 17:04:16,276 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 82 [2020-08-18 17:04:16,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:04:16,282 INFO L225 Difference]: With dead ends: 107 [2020-08-18 17:04:16,282 INFO L226 Difference]: Without dead ends: 57 [2020-08-18 17:04:16,290 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=100, Invalid=280, Unknown=0, NotChecked=0, Total=380 [2020-08-18 17:04:16,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-18 17:04:16,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 54. [2020-08-18 17:04:16,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-18 17:04:16,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 70 transitions. [2020-08-18 17:04:16,310 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 70 transitions. Word has length 82 [2020-08-18 17:04:16,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:04:16,312 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 70 transitions. [2020-08-18 17:04:16,313 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 17:04:16,313 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 70 transitions. [2020-08-18 17:04:16,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2020-08-18 17:04:16,319 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:04:16,320 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 15, 9, 9, 9, 9, 9, 9, 9, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:04:16,320 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 17:04:16,320 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:04:16,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:04:16,322 INFO L82 PathProgramCache]: Analyzing trace with hash -1040445716, now seen corresponding path program 5 times [2020-08-18 17:04:16,322 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:04:16,322 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [488530291] [2020-08-18 17:04:16,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:04:16,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:16,436 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 17:04:16,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:16,439 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 17:04:16,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:16,508 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 17:04:16,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:16,554 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 17:04:16,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:16,586 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 17:04:16,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:16,608 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 17:04:16,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:16,632 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-18 17:04:16,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:16,636 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-18 17:04:16,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:16,647 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-08-18 17:04:16,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:16,658 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 17:04:16,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:16,662 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-18 17:04:16,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:16,669 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2020-08-18 17:04:16,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:16,712 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 17:04:16,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:16,761 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 17:04:16,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:16,828 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 17:04:16,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:16,832 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-18 17:04:16,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:16,836 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-18 17:04:16,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:16,840 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-08-18 17:04:16,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:16,854 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-18 17:04:16,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:16,858 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-18 17:04:16,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 17:04:16,902 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 193 proven. 313 refuted. 0 times theorem prover too weak. 427 trivial. 0 not checked. [2020-08-18 17:04:16,902 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [488530291] [2020-08-18 17:04:16,902 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 17:04:16,903 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 17:04:16,903 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1544883331] [2020-08-18 17:04:16,905 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 17:04:16,905 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 17:04:16,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 17:04:16,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-18 17:04:16,906 INFO L87 Difference]: Start difference. First operand 54 states and 70 transitions. Second operand 13 states. [2020-08-18 17:04:17,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 17:04:17,324 INFO L93 Difference]: Finished difference Result 114 states and 179 transitions. [2020-08-18 17:04:17,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 17:04:17,333 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 136 [2020-08-18 17:04:17,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 17:04:17,335 INFO L225 Difference]: With dead ends: 114 [2020-08-18 17:04:17,335 INFO L226 Difference]: Without dead ends: 73 [2020-08-18 17:04:17,337 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=154, Invalid=496, Unknown=0, NotChecked=0, Total=650 [2020-08-18 17:04:17,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-18 17:04:17,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 63. [2020-08-18 17:04:17,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-18 17:04:17,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 81 transitions. [2020-08-18 17:04:17,348 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 81 transitions. Word has length 136 [2020-08-18 17:04:17,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 17:04:17,349 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 81 transitions. [2020-08-18 17:04:17,349 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 17:04:17,349 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 81 transitions. [2020-08-18 17:04:17,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-08-18 17:04:17,355 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 17:04:17,356 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 7, 7, 7, 7, 7, 7, 7, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 17:04:17,356 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 17:04:17,356 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 17:04:17,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 17:04:17,357 INFO L82 PathProgramCache]: Analyzing trace with hash 1200034344, now seen corresponding path program 6 times [2020-08-18 17:04:17,357 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 17:04:17,357 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1407654447] [2020-08-18 17:04:17,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 17:04:17,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-18 17:04:17,382 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-18 17:04:17,382 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-18 17:04:17,387 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 17:04:17,419 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.08 05:04:17 BoogieIcfgContainer [2020-08-18 17:04:17,420 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-18 17:04:17,426 INFO L168 Benchmark]: Toolchain (without parser) took 4490.41 ms. Allocated memory was 147.8 MB in the beginning and 277.3 MB in the end (delta: 129.5 MB). Free memory was 104.1 MB in the beginning and 239.5 MB in the end (delta: -135.3 MB). There was no memory consumed. Max. memory is 7.1 GB. [2020-08-18 17:04:17,428 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 147.8 MB. Free memory was 122.4 MB in the beginning and 122.2 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-08-18 17:04:17,429 INFO L168 Benchmark]: CACSL2BoogieTranslator took 270.57 ms. Allocated memory is still 147.8 MB. Free memory was 103.9 MB in the beginning and 94.6 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-08-18 17:04:17,429 INFO L168 Benchmark]: Boogie Preprocessor took 34.09 ms. Allocated memory is still 147.8 MB. Free memory was 94.6 MB in the beginning and 93.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-08-18 17:04:17,430 INFO L168 Benchmark]: RCFGBuilder took 352.29 ms. Allocated memory was 147.8 MB in the beginning and 204.5 MB in the end (delta: 56.6 MB). Free memory was 93.2 MB in the beginning and 172.2 MB in the end (delta: -79.0 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. [2020-08-18 17:04:17,434 INFO L168 Benchmark]: TraceAbstraction took 3825.49 ms. Allocated memory was 204.5 MB in the beginning and 277.3 MB in the end (delta: 72.9 MB). Free memory was 171.5 MB in the beginning and 239.5 MB in the end (delta: -67.9 MB). Peak memory consumption was 4.9 MB. Max. memory is 7.1 GB. [2020-08-18 17:04:17,445 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 147.8 MB. Free memory was 122.4 MB in the beginning and 122.2 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 270.57 ms. Allocated memory is still 147.8 MB. Free memory was 103.9 MB in the beginning and 94.6 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 34.09 ms. Allocated memory is still 147.8 MB. Free memory was 94.6 MB in the beginning and 93.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 352.29 ms. Allocated memory was 147.8 MB in the beginning and 204.5 MB in the end (delta: 56.6 MB). Free memory was 93.2 MB in the beginning and 172.2 MB in the end (delta: -79.0 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. * TraceAbstraction took 3825.49 ms. Allocated memory was 204.5 MB in the beginning and 277.3 MB in the end (delta: 72.9 MB). Free memory was 171.5 MB in the beginning and 239.5 MB in the end (delta: -67.9 MB). Peak memory consumption was 4.9 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 27]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L24] int x = 5; [L25] CALL, EXPR fibo(x) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND TRUE n == 1 [L9] return 1; [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND TRUE n < 1 [L7] return 0; [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND FALSE !(n < 1) [L8] COND TRUE n == 1 [L9] return 1; [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND TRUE n == 1 [L9] return 1; [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND TRUE n < 1 [L7] return 0; [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND FALSE !(n == 1) [L11] CALL, EXPR fibo(n-1) [L6] COND FALSE !(n < 1) [L8] COND TRUE n == 1 [L9] return 1; [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND TRUE n < 1 [L7] return 0; [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-1) [L11] CALL, EXPR fibo(n-2) [L6] COND FALSE !(n < 1) [L8] COND TRUE n == 1 [L9] return 1; [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L11] RET, EXPR fibo(n-2) [L11] return fibo(n-1) + fibo(n-2); [L25] RET, EXPR fibo(x) [L25] int result = fibo(x); [L26] COND TRUE result == 5 [L27] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 24 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 3.7s, OverallIterations: 9, TraceHistogramMax: 19, AutomataDifference: 1.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 157 SDtfs, 240 SDslu, 428 SDs, 0 SdLazy, 609 SolverSat, 186 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 218 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 160 ImplicationChecksByTransitivity, 1.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=63occurred in iteration=8, 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, 24 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.6s InterpolantComputationTime, 488 NumberOfCodeBlocks, 488 NumberOfCodeBlocksAsserted, 9 NumberOfCheckSat, 371 ConstructedInterpolants, 0 QuantifiedInterpolants, 55683 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 8 InterpolantComputations, 2 PerfectInterpolantSequences, 894/1351 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 incorrect! Received shutdown request...