/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.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.use.separate.solver.for.trace.checks true -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/recursive/Fibonacci04.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-72570d3 [2020-08-22 21:53:06,932 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 21:53:06,934 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 21:53:06,963 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-08-22 21:53:06,972 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 21:53:06,973 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 21:53:06,974 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 21:53:06,975 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 21:53:06,976 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 21:53:06,977 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 21:53:06,979 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 21:53:06,981 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 21:53:06,982 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 21:53:06,983 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 21:53:06,984 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 21:53:06,985 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 21:53:06,988 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-22 21:53:06,995 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 21:53:06,996 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 21:53:06,997 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 21:53:06,997 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-08-22 21:53:07,006 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 21:53:07,007 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 21:53:07,008 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 21:53:07,008 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 21:53:07,008 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 21:53:07,008 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 21:53:07,009 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 21:53:07,009 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 21:53:07,009 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 21:53:07,009 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 21:53:07,010 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 21:53:07,010 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 21:53:07,010 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 21:53:07,010 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 21:53:07,010 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 21:53:07,011 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-08-22 21:53:07,011 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 21:53:07,011 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 21:53:07,011 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 21:53:07,011 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 21:53:07,012 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-08-22 21:53:07,012 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 21:53:07,012 INFO L138 SettingsManager]: * Use separate solver for trace checks=false 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: Use separate solver for trace checks -> true [2020-08-22 21:53:07,268 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 21:53:07,283 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 21:53:07,286 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 21:53:07,288 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 21:53:07,288 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 21:53:07,289 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Fibonacci04.c [2020-08-22 21:53:07,353 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0736464b8/8b8e5b3587714376af058ee2f278a05a/FLAG706f12698 [2020-08-22 21:53:07,775 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 21:53:07,776 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive/Fibonacci04.c [2020-08-22 21:53:07,782 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0736464b8/8b8e5b3587714376af058ee2f278a05a/FLAG706f12698 [2020-08-22 21:53:08,214 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0736464b8/8b8e5b3587714376af058ee2f278a05a [2020-08-22 21:53:08,223 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 21:53:08,225 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 21:53:08,226 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 21:53:08,226 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 21:53:08,230 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 21:53:08,231 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 09:53:08" (1/1) ... [2020-08-22 21:53:08,234 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3b1a841d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 09:53:08, skipping insertion in model container [2020-08-22 21:53:08,234 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 09:53:08" (1/1) ... [2020-08-22 21:53:08,241 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 21:53:08,261 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 21:53:08,434 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 21:53:08,439 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 21:53:08,458 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 21:53:08,475 INFO L208 MainTranslator]: Completed translation [2020-08-22 21:53:08,476 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 09:53:08 WrapperNode [2020-08-22 21:53:08,476 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 21:53:08,477 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 21:53:08,477 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 21:53:08,478 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 21:53:08,494 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 09:53:08" (1/1) ... [2020-08-22 21:53:08,494 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 09:53:08" (1/1) ... [2020-08-22 21:53:08,576 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 09:53:08" (1/1) ... [2020-08-22 21:53:08,577 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 09:53:08" (1/1) ... [2020-08-22 21:53:08,580 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 09:53:08" (1/1) ... [2020-08-22 21:53:08,582 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 09:53:08" (1/1) ... [2020-08-22 21:53:08,583 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 09:53:08" (1/1) ... [2020-08-22 21:53:08,584 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 21:53:08,585 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 21:53:08,585 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 21:53:08,585 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 21:53:08,586 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 09:53:08" (1/1) ... No working directory specified, using /storage/repos/ultimate/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 [2020-08-22 21:53:08,660 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 21:53:08,660 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 21:53:08,660 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2020-08-22 21:53:08,660 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 21:53:08,660 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 21:53:08,661 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-22 21:53:08,661 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2020-08-22 21:53:08,661 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 21:53:08,661 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 21:53:08,661 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 21:53:08,860 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 21:53:08,860 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-22 21:53:08,864 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 09:53:08 BoogieIcfgContainer [2020-08-22 21:53:08,864 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 21:53:08,865 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 21:53:08,865 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 21:53:08,868 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 21:53:08,868 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 09:53:08" (1/3) ... [2020-08-22 21:53:08,869 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7af732a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 09:53:08, skipping insertion in model container [2020-08-22 21:53:08,869 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 09:53:08" (2/3) ... [2020-08-22 21:53:08,870 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7af732a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 09:53:08, skipping insertion in model container [2020-08-22 21:53:08,870 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 09:53:08" (3/3) ... [2020-08-22 21:53:08,872 INFO L109 eAbstractionObserver]: Analyzing ICFG Fibonacci04.c [2020-08-22 21:53:08,882 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 21:53:08,888 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 21:53:08,902 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 21:53:08,921 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 21:53:08,921 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 21:53:08,922 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-22 21:53:08,922 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 21:53:08,922 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 21:53:08,922 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 21:53:08,922 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 21:53:08,922 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 21:53:08,934 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-08-22 21:53:08,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-22 21:53:08,944 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 21:53:08,945 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 21:53:08,945 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 21:53:08,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 21:53:08,950 INFO L82 PathProgramCache]: Analyzing trace with hash -2064988448, now seen corresponding path program 1 times [2020-08-22 21:53:08,957 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 21:53:08,957 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2007072591] [2020-08-22 21:53:08,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 21:53:09,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:09,122 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 21:53:09,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:09,127 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-22 21:53:09,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:09,234 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 21:53:09,235 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2007072591] [2020-08-22 21:53:09,237 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 21:53:09,237 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 21:53:09,238 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1881397137] [2020-08-22 21:53:09,242 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 21:53:09,242 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 21:53:09,258 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 21:53:09,260 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-22 21:53:09,264 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-08-22 21:53:09,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 21:53:09,381 INFO L93 Difference]: Finished difference Result 48 states and 54 transitions. [2020-08-22 21:53:09,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 21:53:09,383 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 18 [2020-08-22 21:53:09,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 21:53:09,395 INFO L225 Difference]: With dead ends: 48 [2020-08-22 21:53:09,395 INFO L226 Difference]: Without dead ends: 30 [2020-08-22 21:53:09,399 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 [2020-08-22 21:53:09,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-22 21:53:09,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-22 21:53:09,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-22 21:53:09,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2020-08-22 21:53:09,450 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 18 [2020-08-22 21:53:09,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 21:53:09,451 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2020-08-22 21:53:09,451 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 21:53:09,451 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2020-08-22 21:53:09,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-22 21:53:09,454 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 21:53:09,454 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 21:53:09,454 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 21:53:09,455 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 21:53:09,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 21:53:09,455 INFO L82 PathProgramCache]: Analyzing trace with hash -1678486471, now seen corresponding path program 1 times [2020-08-22 21:53:09,456 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 21:53:09,456 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1028316450] [2020-08-22 21:53:09,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 21:53:09,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:09,503 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 21:53:09,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:09,505 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-22 21:53:09,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:09,552 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 21:53:09,553 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1028316450] [2020-08-22 21:53:09,553 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 21:53:09,553 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 21:53:09,554 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842963000] [2020-08-22 21:53:09,555 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 21:53:09,556 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 21:53:09,556 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 21:53:09,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-22 21:53:09,557 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand 5 states. [2020-08-22 21:53:09,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 21:53:09,628 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2020-08-22 21:53:09,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 21:53:09,629 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2020-08-22 21:53:09,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 21:53:09,631 INFO L225 Difference]: With dead ends: 38 [2020-08-22 21:53:09,631 INFO L226 Difference]: Without dead ends: 32 [2020-08-22 21:53:09,632 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 [2020-08-22 21:53:09,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-22 21:53:09,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-08-22 21:53:09,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-22 21:53:09,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2020-08-22 21:53:09,647 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 19 [2020-08-22 21:53:09,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 21:53:09,647 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2020-08-22 21:53:09,648 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 21:53:09,649 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2020-08-22 21:53:09,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-22 21:53:09,650 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 21:53:09,654 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 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, 1, 1] [2020-08-22 21:53:09,654 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 21:53:09,655 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 21:53:09,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 21:53:09,655 INFO L82 PathProgramCache]: Analyzing trace with hash 961212118, now seen corresponding path program 1 times [2020-08-22 21:53:09,656 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 21:53:09,656 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [837636911] [2020-08-22 21:53:09,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 21:53:09,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:09,709 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 21:53:09,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:09,717 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-22 21:53:09,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:09,752 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 21:53:09,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:09,777 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-22 21:53:09,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:09,785 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-08-22 21:53:09,785 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [837636911] [2020-08-22 21:53:09,786 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 21:53:09,786 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-22 21:53:09,786 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1128799759] [2020-08-22 21:53:09,787 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-22 21:53:09,787 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 21:53:09,787 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-22 21:53:09,788 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-22 21:53:09,788 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand 6 states. [2020-08-22 21:53:09,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 21:53:09,888 INFO L93 Difference]: Finished difference Result 54 states and 65 transitions. [2020-08-22 21:53:09,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 21:53:09,889 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 35 [2020-08-22 21:53:09,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 21:53:09,891 INFO L225 Difference]: With dead ends: 54 [2020-08-22 21:53:09,891 INFO L226 Difference]: Without dead ends: 32 [2020-08-22 21:53:09,892 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2020-08-22 21:53:09,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-22 21:53:09,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-22 21:53:09,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-22 21:53:09,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 36 transitions. [2020-08-22 21:53:09,907 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 36 transitions. Word has length 35 [2020-08-22 21:53:09,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 21:53:09,908 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 36 transitions. [2020-08-22 21:53:09,910 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-22 21:53:09,910 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 36 transitions. [2020-08-22 21:53:09,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-22 21:53:09,914 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 21:53:09,914 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, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 21:53:09,915 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-22 21:53:09,915 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 21:53:09,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 21:53:09,916 INFO L82 PathProgramCache]: Analyzing trace with hash -125795935, now seen corresponding path program 1 times [2020-08-22 21:53:09,916 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 21:53:09,917 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [691050816] [2020-08-22 21:53:09,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 21:53:09,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:09,979 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 21:53:09,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:09,982 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-22 21:53:09,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:10,020 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 21:53:10,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:10,042 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-22 21:53:10,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:10,052 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-22 21:53:10,052 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [691050816] [2020-08-22 21:53:10,053 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 21:53:10,053 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-22 21:53:10,053 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [729021366] [2020-08-22 21:53:10,054 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-22 21:53:10,054 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 21:53:10,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-22 21:53:10,055 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-22 21:53:10,055 INFO L87 Difference]: Start difference. First operand 32 states and 36 transitions. Second operand 6 states. [2020-08-22 21:53:10,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 21:53:10,181 INFO L93 Difference]: Finished difference Result 58 states and 72 transitions. [2020-08-22 21:53:10,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-22 21:53:10,182 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 36 [2020-08-22 21:53:10,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 21:53:10,184 INFO L225 Difference]: With dead ends: 58 [2020-08-22 21:53:10,184 INFO L226 Difference]: Without dead ends: 52 [2020-08-22 21:53:10,185 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 [2020-08-22 21:53:10,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-22 21:53:10,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-22 21:53:10,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-22 21:53:10,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 66 transitions. [2020-08-22 21:53:10,210 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 66 transitions. Word has length 36 [2020-08-22 21:53:10,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 21:53:10,211 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 66 transitions. [2020-08-22 21:53:10,211 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-22 21:53:10,211 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 66 transitions. [2020-08-22 21:53:10,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-22 21:53:10,214 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 21:53:10,215 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 21:53:10,215 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-22 21:53:10,215 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 21:53:10,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 21:53:10,216 INFO L82 PathProgramCache]: Analyzing trace with hash 331377205, now seen corresponding path program 2 times [2020-08-22 21:53:10,216 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 21:53:10,216 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [811107453] [2020-08-22 21:53:10,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 21:53:10,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:10,244 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 21:53:10,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:10,246 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-22 21:53:10,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:10,278 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 21:53:10,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:10,323 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 21:53:10,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:10,329 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-22 21:53:10,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:10,334 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2020-08-22 21:53:10,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:10,353 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 27 proven. 7 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-08-22 21:53:10,354 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [811107453] [2020-08-22 21:53:10,354 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 21:53:10,354 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-22 21:53:10,355 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [634851976] [2020-08-22 21:53:10,355 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-22 21:53:10,356 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 21:53:10,356 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-22 21:53:10,356 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-22 21:53:10,356 INFO L87 Difference]: Start difference. First operand 52 states and 66 transitions. Second operand 7 states. [2020-08-22 21:53:10,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 21:53:10,514 INFO L93 Difference]: Finished difference Result 110 states and 153 transitions. [2020-08-22 21:53:10,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-22 21:53:10,517 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 53 [2020-08-22 21:53:10,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 21:53:10,522 INFO L225 Difference]: With dead ends: 110 [2020-08-22 21:53:10,525 INFO L226 Difference]: Without dead ends: 66 [2020-08-22 21:53:10,526 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-08-22 21:53:10,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-22 21:53:10,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 54. [2020-08-22 21:53:10,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-22 21:53:10,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 69 transitions. [2020-08-22 21:53:10,557 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 69 transitions. Word has length 53 [2020-08-22 21:53:10,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 21:53:10,557 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 69 transitions. [2020-08-22 21:53:10,557 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-22 21:53:10,557 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 69 transitions. [2020-08-22 21:53:10,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-22 21:53:10,566 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 21:53:10,567 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 21:53:10,567 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-22 21:53:10,567 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 21:53:10,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 21:53:10,568 INFO L82 PathProgramCache]: Analyzing trace with hash -2068833840, now seen corresponding path program 3 times [2020-08-22 21:53:10,569 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 21:53:10,569 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [13205238] [2020-08-22 21:53:10,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 21:53:10,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:10,633 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 21:53:10,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:10,637 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-22 21:53:10,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:10,702 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 21:53:10,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:10,730 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 21:53:10,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:10,743 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-22 21:53:10,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:10,748 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2020-08-22 21:53:10,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:10,755 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 6 proven. 28 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-08-22 21:53:10,756 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [13205238] [2020-08-22 21:53:10,756 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 21:53:10,756 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-22 21:53:10,756 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1609985075] [2020-08-22 21:53:10,757 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-22 21:53:10,757 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 21:53:10,757 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-22 21:53:10,758 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-22 21:53:10,758 INFO L87 Difference]: Start difference. First operand 54 states and 69 transitions. Second operand 7 states. [2020-08-22 21:53:10,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 21:53:10,883 INFO L93 Difference]: Finished difference Result 88 states and 116 transitions. [2020-08-22 21:53:10,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-22 21:53:10,884 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 54 [2020-08-22 21:53:10,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 21:53:10,887 INFO L225 Difference]: With dead ends: 88 [2020-08-22 21:53:10,887 INFO L226 Difference]: Without dead ends: 82 [2020-08-22 21:53:10,888 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 [2020-08-22 21:53:10,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-22 21:53:10,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 76. [2020-08-22 21:53:10,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-08-22 21:53:10,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 102 transitions. [2020-08-22 21:53:10,909 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 102 transitions. Word has length 54 [2020-08-22 21:53:10,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 21:53:10,910 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 102 transitions. [2020-08-22 21:53:10,910 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-22 21:53:10,910 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 102 transitions. [2020-08-22 21:53:10,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2020-08-22 21:53:10,913 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 21:53:10,914 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 21:53:10,914 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-22 21:53:10,914 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 21:53:10,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 21:53:10,915 INFO L82 PathProgramCache]: Analyzing trace with hash -1575340027, now seen corresponding path program 4 times [2020-08-22 21:53:10,915 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 21:53:10,915 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [276446671] [2020-08-22 21:53:10,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 21:53:10,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:10,997 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 21:53:10,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:11,000 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-22 21:53:11,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:11,071 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 21:53:11,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:11,103 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 21:53:11,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:11,126 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 21:53:11,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:11,142 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-22 21:53:11,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:11,146 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2020-08-22 21:53:11,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:11,152 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2020-08-22 21:53:11,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:11,204 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 21:53:11,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:11,235 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 21:53:11,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:11,256 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 21:53:11,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:11,259 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-22 21:53:11,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:11,263 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2020-08-22 21:53:11,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:11,269 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2020-08-22 21:53:11,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:11,309 INFO L134 CoverageAnalysis]: Checked inductivity of 483 backedges. 130 proven. 176 refuted. 0 times theorem prover too weak. 177 trivial. 0 not checked. [2020-08-22 21:53:11,309 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [276446671] [2020-08-22 21:53:11,310 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 21:53:11,310 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-22 21:53:11,310 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [734494945] [2020-08-22 21:53:11,312 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-22 21:53:11,312 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 21:53:11,312 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-22 21:53:11,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-08-22 21:53:11,313 INFO L87 Difference]: Start difference. First operand 76 states and 102 transitions. Second operand 10 states. [2020-08-22 21:53:11,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 21:53:11,580 INFO L93 Difference]: Finished difference Result 139 states and 201 transitions. [2020-08-22 21:53:11,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-22 21:53:11,581 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 125 [2020-08-22 21:53:11,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 21:53:11,583 INFO L225 Difference]: With dead ends: 139 [2020-08-22 21:53:11,584 INFO L226 Difference]: Without dead ends: 70 [2020-08-22 21:53:11,585 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=116, Invalid=304, Unknown=0, NotChecked=0, Total=420 [2020-08-22 21:53:11,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-22 21:53:11,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 61. [2020-08-22 21:53:11,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-22 21:53:11,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 72 transitions. [2020-08-22 21:53:11,599 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 72 transitions. Word has length 125 [2020-08-22 21:53:11,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 21:53:11,599 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 72 transitions. [2020-08-22 21:53:11,599 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-22 21:53:11,599 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 72 transitions. [2020-08-22 21:53:11,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-08-22 21:53:11,601 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 21:53:11,601 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 7, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 21:53:11,601 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-22 21:53:11,602 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 21:53:11,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 21:53:11,602 INFO L82 PathProgramCache]: Analyzing trace with hash 1005193447, now seen corresponding path program 5 times [2020-08-22 21:53:11,602 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 21:53:11,603 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1447085183] [2020-08-22 21:53:11,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 21:53:11,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:11,637 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 21:53:11,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:11,638 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-22 21:53:11,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:11,670 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 21:53:11,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:11,691 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 21:53:11,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:11,707 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 21:53:11,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:11,739 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-22 21:53:11,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:11,743 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2020-08-22 21:53:11,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:11,747 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2020-08-22 21:53:11,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:11,754 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 21:53:11,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:11,756 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-22 21:53:11,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:11,768 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 20 proven. 105 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2020-08-22 21:53:11,768 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1447085183] [2020-08-22 21:53:11,769 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 21:53:11,769 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-22 21:53:11,769 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1807858026] [2020-08-22 21:53:11,769 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-22 21:53:11,770 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 21:53:11,770 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-22 21:53:11,770 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-08-22 21:53:11,770 INFO L87 Difference]: Start difference. First operand 61 states and 72 transitions. Second operand 8 states. [2020-08-22 21:53:11,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 21:53:11,896 INFO L93 Difference]: Finished difference Result 73 states and 85 transitions. [2020-08-22 21:53:11,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-22 21:53:11,896 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 89 [2020-08-22 21:53:11,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 21:53:11,898 INFO L225 Difference]: With dead ends: 73 [2020-08-22 21:53:11,898 INFO L226 Difference]: Without dead ends: 67 [2020-08-22 21:53:11,899 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=85, Unknown=0, NotChecked=0, Total=132 [2020-08-22 21:53:11,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-08-22 21:53:11,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2020-08-22 21:53:11,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-22 21:53:11,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 79 transitions. [2020-08-22 21:53:11,911 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 79 transitions. Word has length 89 [2020-08-22 21:53:11,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 21:53:11,911 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 79 transitions. [2020-08-22 21:53:11,912 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-22 21:53:11,912 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 79 transitions. [2020-08-22 21:53:11,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2020-08-22 21:53:11,914 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 21:53:11,914 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 17, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 7, 7, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 21:53:11,914 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-22 21:53:11,914 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 21:53:11,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 21:53:11,915 INFO L82 PathProgramCache]: Analyzing trace with hash -750862549, now seen corresponding path program 6 times [2020-08-22 21:53:11,915 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 21:53:11,915 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1192711013] [2020-08-22 21:53:11,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 21:53:11,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:11,980 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 21:53:11,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:11,982 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-08-22 21:53:12,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:12,042 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 21:53:12,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:12,061 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 21:53:12,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:12,068 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 21:53:12,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:12,072 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 21:53:12,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:12,074 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-22 21:53:12,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:12,076 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2020-08-22 21:53:12,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:12,078 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2020-08-22 21:53:12,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:12,082 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 21:53:12,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:12,084 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-22 21:53:12,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:12,089 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 81 [2020-08-22 21:53:12,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:12,118 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 21:53:12,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:12,146 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 21:53:12,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:12,168 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 21:53:12,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:12,187 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 21:53:12,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:12,189 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-22 21:53:12,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:12,193 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 28 [2020-08-22 21:53:12,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:12,213 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2020-08-22 21:53:12,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:12,219 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-22 21:53:12,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:12,221 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-22 21:53:12,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:12,228 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 81 [2020-08-22 21:53:12,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 21:53:12,292 INFO L134 CoverageAnalysis]: Checked inductivity of 1318 backedges. 465 proven. 132 refuted. 0 times theorem prover too weak. 721 trivial. 0 not checked. [2020-08-22 21:53:12,292 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1192711013] [2020-08-22 21:53:12,292 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 21:53:12,293 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-22 21:53:12,293 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1453742821] [2020-08-22 21:53:12,293 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-22 21:53:12,294 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 21:53:12,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-22 21:53:12,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-08-22 21:53:12,294 INFO L87 Difference]: Start difference. First operand 67 states and 79 transitions. Second operand 10 states. [2020-08-22 21:53:12,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 21:53:12,545 INFO L93 Difference]: Finished difference Result 143 states and 194 transitions. [2020-08-22 21:53:12,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-22 21:53:12,546 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 195 [2020-08-22 21:53:12,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 21:53:12,548 INFO L225 Difference]: With dead ends: 143 [2020-08-22 21:53:12,548 INFO L226 Difference]: Without dead ends: 70 [2020-08-22 21:53:12,550 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-08-22 21:53:12,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-22 21:53:12,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2020-08-22 21:53:12,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-08-22 21:53:12,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 77 transitions. [2020-08-22 21:53:12,575 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 77 transitions. Word has length 195 [2020-08-22 21:53:12,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 21:53:12,577 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 77 transitions. [2020-08-22 21:53:12,577 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-22 21:53:12,577 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 77 transitions. [2020-08-22 21:53:12,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2020-08-22 21:53:12,579 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 21:53:12,580 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 5, 5, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 21:53:12,580 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-22 21:53:12,580 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 21:53:12,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 21:53:12,580 INFO L82 PathProgramCache]: Analyzing trace with hash -311463261, now seen corresponding path program 7 times [2020-08-22 21:53:12,581 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 21:53:12,581 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1207007963] [2020-08-22 21:53:12,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 21:53:12,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 21:53:12,618 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 21:53:12,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 21:53:12,634 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 21:53:12,660 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-22 21:53:12,660 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-22 21:53:12,660 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-22 21:53:12,705 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.08 09:53:12 BoogieIcfgContainer [2020-08-22 21:53:12,705 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-22 21:53:12,708 INFO L168 Benchmark]: Toolchain (without parser) took 4482.16 ms. Allocated memory was 140.0 MB in the beginning and 282.1 MB in the end (delta: 142.1 MB). Free memory was 104.5 MB in the beginning and 242.4 MB in the end (delta: -137.9 MB). Peak memory consumption was 4.2 MB. Max. memory is 7.1 GB. [2020-08-22 21:53:12,709 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 140.0 MB. Free memory was 122.5 MB in the beginning and 122.3 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-08-22 21:53:12,710 INFO L168 Benchmark]: CACSL2BoogieTranslator took 250.69 ms. Allocated memory is still 140.0 MB. Free memory was 104.3 MB in the beginning and 94.8 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. [2020-08-22 21:53:12,710 INFO L168 Benchmark]: Boogie Preprocessor took 107.04 ms. Allocated memory was 140.0 MB in the beginning and 202.9 MB in the end (delta: 62.9 MB). Free memory was 94.8 MB in the beginning and 182.0 MB in the end (delta: -87.1 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. [2020-08-22 21:53:12,711 INFO L168 Benchmark]: RCFGBuilder took 279.49 ms. Allocated memory is still 202.9 MB. Free memory was 182.0 MB in the beginning and 168.7 MB in the end (delta: 13.3 MB). Peak memory consumption was 13.3 MB. Max. memory is 7.1 GB. [2020-08-22 21:53:12,712 INFO L168 Benchmark]: TraceAbstraction took 3840.37 ms. Allocated memory was 202.9 MB in the beginning and 282.1 MB in the end (delta: 79.2 MB). Free memory was 168.7 MB in the beginning and 242.4 MB in the end (delta: -73.7 MB). Peak memory consumption was 5.5 MB. Max. memory is 7.1 GB. [2020-08-22 21:53:12,716 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 140.0 MB. Free memory was 122.5 MB in the beginning and 122.3 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 250.69 ms. Allocated memory is still 140.0 MB. Free memory was 104.3 MB in the beginning and 94.8 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 107.04 ms. Allocated memory was 140.0 MB in the beginning and 202.9 MB in the end (delta: 62.9 MB). Free memory was 94.8 MB in the beginning and 182.0 MB in the end (delta: -87.1 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. * RCFGBuilder took 279.49 ms. Allocated memory is still 202.9 MB. Free memory was 182.0 MB in the beginning and 168.7 MB in the end (delta: 13.3 MB). Peak memory consumption was 13.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 3840.37 ms. Allocated memory was 202.9 MB in the beginning and 282.1 MB in the end (delta: 79.2 MB). Free memory was 168.7 MB in the beginning and 242.4 MB in the end (delta: -73.7 MB). Peak memory consumption was 5.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 33]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L28] int x = __VERIFIER_nondet_int(); VAL [__VERIFIER_nondet_int()=5, x=5] [L29] CALL, EXPR fibonacci(x) VAL [\old(n)=5] [L17] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L19] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L22] CALL, EXPR fibonacci(n-1) VAL [\old(n)=4] [L17] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L19] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L22] CALL, EXPR fibonacci(n-1) VAL [\old(n)=3] [L17] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L19] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L22] CALL, EXPR fibonacci(n-1) VAL [\old(n)=2] [L17] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L19] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L22] CALL, EXPR fibonacci(n-1) VAL [\old(n)=1] [L17] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L19] COND TRUE n == 1 VAL [\old(n)=1, n=1] [L20] return 1; VAL [\old(n)=1, \result=1, n=1] [L22] RET, EXPR fibonacci(n-1) VAL [\old(n)=2, fibonacci(n-1)=1, n=2] [L22] CALL, EXPR fibonacci(n-2) VAL [\old(n)=0] [L17] COND TRUE n < 1 VAL [\old(n)=0, n=0] [L18] return 0; VAL [\old(n)=0, \result=0, n=0] [L22] RET, EXPR fibonacci(n-2) VAL [\old(n)=2, fibonacci(n-1)=1, fibonacci(n-2)=0, n=2] [L22] return fibonacci(n-1) + fibonacci(n-2); VAL [\old(n)=2, \result=1, fibonacci(n-1)=1, fibonacci(n-2)=0, n=2] [L22] RET, EXPR fibonacci(n-1) VAL [\old(n)=3, fibonacci(n-1)=1, n=3] [L22] CALL, EXPR fibonacci(n-2) VAL [\old(n)=1] [L17] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L19] COND TRUE n == 1 VAL [\old(n)=1, n=1] [L20] return 1; VAL [\old(n)=1, \result=1, n=1] [L22] RET, EXPR fibonacci(n-2) VAL [\old(n)=3, fibonacci(n-1)=1, fibonacci(n-2)=1, n=3] [L22] return fibonacci(n-1) + fibonacci(n-2); VAL [\old(n)=3, \result=2, fibonacci(n-1)=1, fibonacci(n-2)=1, n=3] [L22] RET, EXPR fibonacci(n-1) VAL [\old(n)=4, fibonacci(n-1)=2, n=4] [L22] CALL, EXPR fibonacci(n-2) VAL [\old(n)=2] [L17] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L19] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L22] CALL, EXPR fibonacci(n-1) VAL [\old(n)=1] [L17] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L19] COND TRUE n == 1 VAL [\old(n)=1, n=1] [L20] return 1; VAL [\old(n)=1, \result=1, n=1] [L22] RET, EXPR fibonacci(n-1) VAL [\old(n)=2, fibonacci(n-1)=1, n=2] [L22] CALL, EXPR fibonacci(n-2) VAL [\old(n)=0] [L17] COND TRUE n < 1 VAL [\old(n)=0, n=0] [L18] return 0; VAL [\old(n)=0, \result=0, n=0] [L22] RET, EXPR fibonacci(n-2) VAL [\old(n)=2, fibonacci(n-1)=1, fibonacci(n-2)=0, n=2] [L22] return fibonacci(n-1) + fibonacci(n-2); VAL [\old(n)=2, \result=1, fibonacci(n-1)=1, fibonacci(n-2)=0, n=2] [L22] RET, EXPR fibonacci(n-2) VAL [\old(n)=4, fibonacci(n-1)=2, fibonacci(n-2)=1, n=4] [L22] return fibonacci(n-1) + fibonacci(n-2); VAL [\old(n)=4, \result=3, fibonacci(n-1)=2, fibonacci(n-2)=1, n=4] [L22] RET, EXPR fibonacci(n-1) VAL [\old(n)=5, fibonacci(n-1)=3, n=5] [L22] CALL, EXPR fibonacci(n-2) VAL [\old(n)=3] [L17] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L19] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L22] CALL, EXPR fibonacci(n-1) VAL [\old(n)=2] [L17] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L19] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L22] CALL, EXPR fibonacci(n-1) VAL [\old(n)=1] [L17] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L19] COND TRUE n == 1 VAL [\old(n)=1, n=1] [L20] return 1; VAL [\old(n)=1, \result=1, n=1] [L22] RET, EXPR fibonacci(n-1) VAL [\old(n)=2, fibonacci(n-1)=1, n=2] [L22] CALL, EXPR fibonacci(n-2) VAL [\old(n)=0] [L17] COND TRUE n < 1 VAL [\old(n)=0, n=0] [L18] return 0; VAL [\old(n)=0, \result=0, n=0] [L22] RET, EXPR fibonacci(n-2) VAL [\old(n)=2, fibonacci(n-1)=1, fibonacci(n-2)=0, n=2] [L22] return fibonacci(n-1) + fibonacci(n-2); VAL [\old(n)=2, \result=1, fibonacci(n-1)=1, fibonacci(n-2)=0, n=2] [L22] RET, EXPR fibonacci(n-1) VAL [\old(n)=3, fibonacci(n-1)=1, n=3] [L22] CALL, EXPR fibonacci(n-2) VAL [\old(n)=1] [L17] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L19] COND TRUE n == 1 VAL [\old(n)=1, n=1] [L20] return 1; VAL [\old(n)=1, \result=1, n=1] [L22] RET, EXPR fibonacci(n-2) VAL [\old(n)=3, fibonacci(n-1)=1, fibonacci(n-2)=1, n=3] [L22] return fibonacci(n-1) + fibonacci(n-2); VAL [\old(n)=3, \result=2, fibonacci(n-1)=1, fibonacci(n-2)=1, n=3] [L22] RET, EXPR fibonacci(n-2) VAL [\old(n)=5, fibonacci(n-1)=3, fibonacci(n-2)=2, n=5] [L22] return fibonacci(n-1) + fibonacci(n-2); VAL [\old(n)=5, \result=5, fibonacci(n-1)=3, fibonacci(n-2)=2, n=5] [L29] RET, EXPR fibonacci(x) VAL [fibonacci(x)=5, x=5] [L29] int result = fibonacci(x); VAL [fibonacci(x)=5, result=5, x=5] [L30] COND FALSE !(x != 5 || result == 3) VAL [result=5, x=5] [L33] __VERIFIER_error() VAL [result=5, x=5] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 3.7s, OverallIterations: 10, TraceHistogramMax: 21, AutomataDifference: 1.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 283 SDtfs, 278 SDslu, 757 SDs, 0 SdLazy, 634 SolverSat, 130 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 247 GetRequests, 166 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 0.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=76occurred in iteration=6, 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, 9 MinimizatonAttempts, 29 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 1.5s InterpolantComputationTime, 766 NumberOfCodeBlocks, 766 NumberOfCodeBlocksAsserted, 10 NumberOfCheckSat, 615 ConstructedInterpolants, 0 QuantifiedInterpolants, 121037 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 9 InterpolantComputations, 2 PerfectInterpolantSequences, 1685/2143 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...