/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.assert.codeblocks.term.scoring.heuristic DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 --traceabstraction.trace.refinement.strategy CAMEL_SMT_AM -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_4-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-79ed534 [2020-07-20 03:33:54,302 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 03:33:54,305 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 03:33:54,324 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-07-20 03:33:54,350 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 03:33:54,352 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 03:33:54,354 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 03:33:54,355 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 03:33:54,356 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 03:33:54,357 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 03:33:54,358 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 03:33:54,363 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 03:33:54,367 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 03:33:54,370 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 03:33:54,372 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 03:33:54,372 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 03:33:54,375 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 03:33:54,385 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 03:33:54,386 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 03:33:54,387 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 03:33:54,388 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 03:33:54,425 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 03:33:54,425 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 03:33:54,428 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 03:33:54,428 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 03:33:54,428 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 03:33:54,429 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 03:33:54,429 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 03:33:54,429 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 03:33:54,429 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 03:33:54,429 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 03:33:54,430 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 03:33:54,430 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 03:33:54,430 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 03:33:54,431 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 03:33:54,431 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 03:33:54,431 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 03:33:54,432 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 03:33:54,432 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 03:33:54,432 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 03:33:54,432 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 03:33:54,432 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 03:33:54,433 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 03:33:54,433 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 03:33:54,433 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 03:33:54,437 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 03:33:54,437 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 03:33:54,437 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 03:33:54,438 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 03:33:54,438 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 03:33:54,438 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> CAMEL_SMT_AM [2020-07-20 03:33:54,705 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 03:33:54,723 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 03:33:54,726 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 03:33:54,728 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 03:33:54,730 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 03:33:54,732 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_4-2.c [2020-07-20 03:33:54,807 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6acf1302d/de2810f9218a41b4b9ce0983386c04ad/FLAGaefe532d0 [2020-07-20 03:33:55,273 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 03:33:55,274 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_4-2.c [2020-07-20 03:33:55,281 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6acf1302d/de2810f9218a41b4b9ce0983386c04ad/FLAGaefe532d0 [2020-07-20 03:33:55,636 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6acf1302d/de2810f9218a41b4b9ce0983386c04ad [2020-07-20 03:33:55,645 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 03:33:55,649 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 03:33:55,650 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 03:33:55,650 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 03:33:55,653 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 03:33:55,654 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 03:33:55" (1/1) ... [2020-07-20 03:33:55,657 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@136d65e5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:33:55, skipping insertion in model container [2020-07-20 03:33:55,657 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 03:33:55" (1/1) ... [2020-07-20 03:33:55,665 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 03:33:55,681 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 03:33:55,859 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 03:33:55,863 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 03:33:55,877 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 03:33:55,890 INFO L208 MainTranslator]: Completed translation [2020-07-20 03:33:55,891 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:33:55 WrapperNode [2020-07-20 03:33:55,891 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 03:33:55,891 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 03:33:55,891 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 03:33:55,892 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 03:33:55,901 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:33:55" (1/1) ... [2020-07-20 03:33:55,901 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:33:55" (1/1) ... [2020-07-20 03:33:55,906 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:33:55" (1/1) ... [2020-07-20 03:33:55,906 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:33:55" (1/1) ... [2020-07-20 03:33:55,909 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:33:55" (1/1) ... [2020-07-20 03:33:55,911 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:33:55" (1/1) ... [2020-07-20 03:33:55,912 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:33:55" (1/1) ... [2020-07-20 03:33:55,914 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 03:33:55,914 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 03:33:55,914 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 03:33:55,915 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 03:33:55,916 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:33:55" (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 [2020-07-20 03:33:56,077 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 03:33:56,077 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 03:33:56,077 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-20 03:33:56,077 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-20 03:33:56,077 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 03:33:56,077 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 03:33:56,078 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 03:33:56,078 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-20 03:33:56,078 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-20 03:33:56,078 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 03:33:56,078 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 03:33:56,078 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 03:33:56,289 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 03:33:56,300 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 03:33:56,306 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 03:33:56 BoogieIcfgContainer [2020-07-20 03:33:56,306 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 03:33:56,308 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 03:33:56,308 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 03:33:56,312 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 03:33:56,312 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 03:33:55" (1/3) ... [2020-07-20 03:33:56,313 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c7ddcea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 03:33:56, skipping insertion in model container [2020-07-20 03:33:56,314 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 03:33:55" (2/3) ... [2020-07-20 03:33:56,314 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c7ddcea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 03:33:56, skipping insertion in model container [2020-07-20 03:33:56,314 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 03:33:56" (3/3) ... [2020-07-20 03:33:56,316 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_4-2.c [2020-07-20 03:33:56,329 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-07-20 03:33:56,336 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 03:33:56,370 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 03:33:56,394 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 03:33:56,394 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 03:33:56,394 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-07-20 03:33:56,394 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 03:33:56,395 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 03:33:56,395 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 03:33:56,395 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 03:33:56,395 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 03:33:56,415 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-20 03:33:56,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 03:33:56,421 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 03:33:56,422 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 03:33:56,422 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 03:33:56,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 03:33:56,427 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-20 03:33:56,434 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 03:33:56,434 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [673315662] [2020-07-20 03:33:56,435 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@439c2796 [2020-07-20 03:33:56,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:33:56,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:33:56,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:33:56,661 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 03:33:56,662 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [673315662] [2020-07-20 03:33:56,662 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 03:33:56,663 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 03:33:56,664 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1600499403] [2020-07-20 03:33:56,668 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 03:33:56,668 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 03:33:56,679 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 03:33:56,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 03:33:56,682 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-20 03:33:56,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 03:33:56,795 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-20 03:33:56,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 03:33:56,798 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 03:33:56,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 03:33:56,808 INFO L225 Difference]: With dead ends: 44 [2020-07-20 03:33:56,808 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 03:33:56,812 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 [2020-07-20 03:33:56,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 03:33:56,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-20 03:33:56,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 03:33:56,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 03:33:56,859 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-20 03:33:56,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 03:33:56,860 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 03:33:56,860 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 03:33:56,860 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 03:33:56,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 03:33:56,862 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 03:33:56,862 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 03:33:56,863 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-07-20 03:33:56,863 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 03:33:56,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 03:33:56,864 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-20 03:33:56,864 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 03:33:56,865 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1313063827] [2020-07-20 03:33:56,865 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@439c2796 [2020-07-20 03:33:56,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:33:56,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:33:56,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:33:56,951 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 03:33:56,952 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1313063827] [2020-07-20 03:33:56,952 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 03:33:56,952 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 03:33:56,953 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [745404711] [2020-07-20 03:33:56,955 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 03:33:56,955 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 03:33:56,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 03:33:56,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 03:33:56,956 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-20 03:33:57,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 03:33:57,035 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-20 03:33:57,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 03:33:57,036 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 03:33:57,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 03:33:57,038 INFO L225 Difference]: With dead ends: 36 [2020-07-20 03:33:57,038 INFO L226 Difference]: Without dead ends: 32 [2020-07-20 03:33:57,040 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 [2020-07-20 03:33:57,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-20 03:33:57,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-20 03:33:57,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 03:33:57,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 03:33:57,050 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-20 03:33:57,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 03:33:57,050 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 03:33:57,050 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 03:33:57,051 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 03:33:57,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 03:33:57,052 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 03:33:57,053 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 03:33:57,053 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-07-20 03:33:57,053 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 03:33:57,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 03:33:57,054 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-20 03:33:57,054 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 03:33:57,054 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [500398440] [2020-07-20 03:33:57,055 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@439c2796 [2020-07-20 03:33:57,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:33:57,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:33:57,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:33:57,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:33:57,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:33:57,230 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 03:33:57,231 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [500398440] [2020-07-20 03:33:57,231 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1084478138] [2020-07-20 03:33:57,232 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@2d4b001e No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 03:33:57,287 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@2d4b001e issued 3 check-sat command(s) [2020-07-20 03:33:57,287 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 03:33:57,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 03:33:57,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 03:33:57,385 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 03:33:57,386 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 03:33:57,386 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 03:33:57,386 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1452328160] [2020-07-20 03:33:57,387 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 03:33:57,387 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 03:33:57,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 03:33:57,388 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2020-07-20 03:33:57,388 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-20 03:33:57,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 03:33:57,619 INFO L93 Difference]: Finished difference Result 58 states and 78 transitions. [2020-07-20 03:33:57,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 03:33:57,620 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-20 03:33:57,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 03:33:57,621 INFO L225 Difference]: With dead ends: 58 [2020-07-20 03:33:57,622 INFO L226 Difference]: Without dead ends: 34 [2020-07-20 03:33:57,625 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 03:33:57,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-20 03:33:57,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2020-07-20 03:33:57,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-07-20 03:33:57,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 39 transitions. [2020-07-20 03:33:57,640 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 39 transitions. Word has length 26 [2020-07-20 03:33:57,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 03:33:57,642 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 39 transitions. [2020-07-20 03:33:57,642 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 03:33:57,642 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 39 transitions. [2020-07-20 03:33:57,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 03:33:57,646 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 03:33:57,646 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 03:33:57,847 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-07-20 03:33:57,848 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 03:33:57,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 03:33:57,848 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-20 03:33:57,849 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 03:33:57,850 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [628317964] [2020-07-20 03:33:57,850 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@439c2796 [2020-07-20 03:33:57,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:33:57,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:33:57,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:33:57,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:33:57,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:33:57,979 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 03:33:57,979 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [628317964] [2020-07-20 03:33:57,980 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2068663466] [2020-07-20 03:33:57,980 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@44996012 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 03:33:58,014 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@44996012 issued 3 check-sat command(s) [2020-07-20 03:33:58,014 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 03:33:58,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 03:33:58,017 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 03:33:58,057 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 03:33:58,058 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 03:33:58,058 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2020-07-20 03:33:58,058 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [141046304] [2020-07-20 03:33:58,059 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 03:33:58,059 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 03:33:58,059 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 03:33:58,060 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-07-20 03:33:58,060 INFO L87 Difference]: Start difference. First operand 32 states and 39 transitions. Second operand 9 states. [2020-07-20 03:33:58,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 03:33:58,225 INFO L93 Difference]: Finished difference Result 54 states and 74 transitions. [2020-07-20 03:33:58,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 03:33:58,226 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-20 03:33:58,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 03:33:58,229 INFO L225 Difference]: With dead ends: 54 [2020-07-20 03:33:58,230 INFO L226 Difference]: Without dead ends: 50 [2020-07-20 03:33:58,231 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-20 03:33:58,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-07-20 03:33:58,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 48. [2020-07-20 03:33:58,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-07-20 03:33:58,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 65 transitions. [2020-07-20 03:33:58,243 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 65 transitions. Word has length 27 [2020-07-20 03:33:58,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 03:33:58,244 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 65 transitions. [2020-07-20 03:33:58,244 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 03:33:58,244 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 65 transitions. [2020-07-20 03:33:58,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 03:33:58,246 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 03:33:58,246 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 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, 1, 1] [2020-07-20 03:33:58,460 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 03:33:58,461 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 03:33:58,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 03:33:58,461 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-20 03:33:58,462 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 03:33:58,463 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1125371817] [2020-07-20 03:33:58,463 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@439c2796 [2020-07-20 03:33:58,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:33:58,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:33:58,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:33:58,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:33:58,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:33:58,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:33:58,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:33:58,555 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 03:33:58,555 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1125371817] [2020-07-20 03:33:58,555 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1304131993] [2020-07-20 03:33:58,556 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@2e5c2b0e No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 03:33:58,596 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@2e5c2b0e issued 3 check-sat command(s) [2020-07-20 03:33:58,597 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 03:33:58,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 03:33:58,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 03:33:58,679 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 03:33:58,680 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 03:33:58,680 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8] total 11 [2020-07-20 03:33:58,680 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [107791370] [2020-07-20 03:33:58,681 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 03:33:58,681 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 03:33:58,682 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 03:33:58,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2020-07-20 03:33:58,682 INFO L87 Difference]: Start difference. First operand 48 states and 65 transitions. Second operand 11 states. [2020-07-20 03:33:58,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 03:33:58,993 INFO L93 Difference]: Finished difference Result 108 states and 170 transitions. [2020-07-20 03:33:58,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 03:33:58,994 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-20 03:33:58,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 03:33:59,000 INFO L225 Difference]: With dead ends: 108 [2020-07-20 03:33:59,000 INFO L226 Difference]: Without dead ends: 66 [2020-07-20 03:33:59,005 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=65, Invalid=241, Unknown=0, NotChecked=0, Total=306 [2020-07-20 03:33:59,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-07-20 03:33:59,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2020-07-20 03:33:59,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-20 03:33:59,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 95 transitions. [2020-07-20 03:33:59,041 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 95 transitions. Word has length 39 [2020-07-20 03:33:59,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 03:33:59,042 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 95 transitions. [2020-07-20 03:33:59,042 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 03:33:59,042 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 95 transitions. [2020-07-20 03:33:59,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-20 03:33:59,045 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 03:33:59,048 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 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, 1, 1, 1] [2020-07-20 03:33:59,262 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 03:33:59,263 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 03:33:59,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 03:33:59,269 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-20 03:33:59,269 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 03:33:59,269 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1990757677] [2020-07-20 03:33:59,270 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@439c2796 [2020-07-20 03:33:59,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:33:59,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:33:59,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:33:59,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:33:59,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:33:59,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:33:59,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:33:59,427 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-20 03:33:59,428 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1990757677] [2020-07-20 03:33:59,429 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [400400232] [2020-07-20 03:33:59,429 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@42709b3e No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 03:33:59,477 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@42709b3e issued 3 check-sat command(s) [2020-07-20 03:33:59,478 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 03:33:59,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 03:33:59,485 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 03:33:59,581 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 03:33:59,582 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 03:33:59,582 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 13 [2020-07-20 03:33:59,583 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1282937666] [2020-07-20 03:33:59,583 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 03:33:59,584 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 03:33:59,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 03:33:59,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2020-07-20 03:33:59,584 INFO L87 Difference]: Start difference. First operand 66 states and 95 transitions. Second operand 13 states. [2020-07-20 03:33:59,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 03:33:59,993 INFO L93 Difference]: Finished difference Result 180 states and 324 transitions. [2020-07-20 03:33:59,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 03:33:59,994 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 40 [2020-07-20 03:33:59,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 03:34:00,000 INFO L225 Difference]: With dead ends: 180 [2020-07-20 03:34:00,000 INFO L226 Difference]: Without dead ends: 120 [2020-07-20 03:34:00,003 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=376, Unknown=0, NotChecked=0, Total=462 [2020-07-20 03:34:00,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2020-07-20 03:34:00,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 106. [2020-07-20 03:34:00,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-07-20 03:34:00,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 169 transitions. [2020-07-20 03:34:00,028 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 169 transitions. Word has length 40 [2020-07-20 03:34:00,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 03:34:00,028 INFO L479 AbstractCegarLoop]: Abstraction has 106 states and 169 transitions. [2020-07-20 03:34:00,028 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 03:34:00,028 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 169 transitions. [2020-07-20 03:34:00,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-07-20 03:34:00,031 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 03:34:00,031 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 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, 1, 1, 1] [2020-07-20 03:34:00,246 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 03:34:00,247 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 03:34:00,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 03:34:00,248 INFO L82 PathProgramCache]: Analyzing trace with hash -405677468, now seen corresponding path program 1 times [2020-07-20 03:34:00,249 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 03:34:00,249 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1576296204] [2020-07-20 03:34:00,250 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@439c2796 [2020-07-20 03:34:00,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:34:00,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:34:00,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:34:00,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:34:00,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:34:00,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:34:00,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:34:00,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:34:00,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:34:00,448 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 15 proven. 4 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2020-07-20 03:34:00,448 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1576296204] [2020-07-20 03:34:00,448 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [326501144] [2020-07-20 03:34:00,449 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@5b03b5ca No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 03:34:00,486 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@5b03b5ca issued 4 check-sat command(s) [2020-07-20 03:34:00,486 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 03:34:00,487 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 03:34:00,490 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 03:34:00,550 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-20 03:34:00,552 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 03:34:00,552 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2020-07-20 03:34:00,553 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [426537359] [2020-07-20 03:34:00,553 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 03:34:00,554 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 03:34:00,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 03:34:00,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=107, Unknown=0, NotChecked=0, Total=132 [2020-07-20 03:34:00,554 INFO L87 Difference]: Start difference. First operand 106 states and 169 transitions. Second operand 12 states. [2020-07-20 03:34:00,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 03:34:00,920 INFO L93 Difference]: Finished difference Result 265 states and 511 transitions. [2020-07-20 03:34:00,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 03:34:00,921 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 54 [2020-07-20 03:34:00,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 03:34:00,925 INFO L225 Difference]: With dead ends: 265 [2020-07-20 03:34:00,925 INFO L226 Difference]: Without dead ends: 165 [2020-07-20 03:34:00,927 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 03:34:00,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2020-07-20 03:34:00,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 142. [2020-07-20 03:34:00,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2020-07-20 03:34:00,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 244 transitions. [2020-07-20 03:34:00,959 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 244 transitions. Word has length 54 [2020-07-20 03:34:00,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 03:34:00,960 INFO L479 AbstractCegarLoop]: Abstraction has 142 states and 244 transitions. [2020-07-20 03:34:00,960 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 03:34:00,960 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 244 transitions. [2020-07-20 03:34:00,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-07-20 03:34:00,963 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 03:34:00,963 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 03:34:01,174 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2020-07-20 03:34:01,175 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 03:34:01,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 03:34:01,176 INFO L82 PathProgramCache]: Analyzing trace with hash -242988780, now seen corresponding path program 1 times [2020-07-20 03:34:01,176 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 03:34:01,177 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1137346200] [2020-07-20 03:34:01,178 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@439c2796 [2020-07-20 03:34:01,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:34:01,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:34:01,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:34:01,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:34:01,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:34:01,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:34:01,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:34:01,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:34:01,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:34:01,382 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 19 proven. 11 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-20 03:34:01,383 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1137346200] [2020-07-20 03:34:01,383 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [236844033] [2020-07-20 03:34:01,384 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@5fd65a56 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 03:34:01,444 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@5fd65a56 issued 4 check-sat command(s) [2020-07-20 03:34:01,445 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 03:34:01,446 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 03:34:01,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 03:34:01,518 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 18 proven. 5 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2020-07-20 03:34:01,518 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 03:34:01,518 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7] total 13 [2020-07-20 03:34:01,519 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [992859352] [2020-07-20 03:34:01,522 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 03:34:01,524 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 03:34:01,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 03:34:01,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=129, Unknown=0, NotChecked=0, Total=156 [2020-07-20 03:34:01,525 INFO L87 Difference]: Start difference. First operand 142 states and 244 transitions. Second operand 13 states. [2020-07-20 03:34:01,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 03:34:01,939 INFO L93 Difference]: Finished difference Result 304 states and 583 transitions. [2020-07-20 03:34:01,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 03:34:01,940 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 55 [2020-07-20 03:34:01,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 03:34:01,942 INFO L225 Difference]: With dead ends: 304 [2020-07-20 03:34:01,943 INFO L226 Difference]: Without dead ends: 101 [2020-07-20 03:34:01,945 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=73, Invalid=307, Unknown=0, NotChecked=0, Total=380 [2020-07-20 03:34:01,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2020-07-20 03:34:01,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 83. [2020-07-20 03:34:01,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-07-20 03:34:01,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 126 transitions. [2020-07-20 03:34:01,969 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 126 transitions. Word has length 55 [2020-07-20 03:34:01,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 03:34:01,973 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 126 transitions. [2020-07-20 03:34:01,973 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 03:34:01,973 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 126 transitions. [2020-07-20 03:34:01,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-07-20 03:34:01,976 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 03:34:01,977 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 03:34:02,190 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 03:34:02,191 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 03:34:02,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 03:34:02,191 INFO L82 PathProgramCache]: Analyzing trace with hash -1751947273, now seen corresponding path program 2 times [2020-07-20 03:34:02,192 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 03:34:02,192 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1599447228] [2020-07-20 03:34:02,192 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@439c2796 [2020-07-20 03:34:02,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:34:02,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:34:02,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:34:02,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:34:02,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:34:02,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:34:02,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:34:02,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:34:02,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:34:02,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:34:02,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 03:34:02,383 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 35 proven. 25 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2020-07-20 03:34:02,383 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1599447228] [2020-07-20 03:34:02,384 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [641504713] [2020-07-20 03:34:02,384 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@5b13214 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 03:34:02,435 INFO L228 tOrderPrioritization]: Assert order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@5b13214 issued 4 check-sat command(s) [2020-07-20 03:34:02,435 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 03:34:02,437 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 03:34:02,440 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 03:34:02,535 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 38 proven. 7 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-20 03:34:02,536 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 03:34:02,536 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 8] total 16 [2020-07-20 03:34:02,537 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1301396683] [2020-07-20 03:34:02,539 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 03:34:02,539 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_SMT_AM [2020-07-20 03:34:02,539 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 03:34:02,540 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=206, Unknown=0, NotChecked=0, Total=240 [2020-07-20 03:34:02,540 INFO L87 Difference]: Start difference. First operand 83 states and 126 transitions. Second operand 16 states. [2020-07-20 03:34:03,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 03:34:03,055 INFO L93 Difference]: Finished difference Result 174 states and 293 transitions. [2020-07-20 03:34:03,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-20 03:34:03,056 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 69 [2020-07-20 03:34:03,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 03:34:03,057 INFO L225 Difference]: With dead ends: 174 [2020-07-20 03:34:03,057 INFO L226 Difference]: Without dead ends: 89 [2020-07-20 03:34:03,059 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=124, Invalid=632, Unknown=0, NotChecked=0, Total=756 [2020-07-20 03:34:03,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2020-07-20 03:34:03,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 80. [2020-07-20 03:34:03,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-07-20 03:34:03,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 107 transitions. [2020-07-20 03:34:03,068 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 107 transitions. Word has length 69 [2020-07-20 03:34:03,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 03:34:03,069 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 107 transitions. [2020-07-20 03:34:03,069 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 03:34:03,069 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 107 transitions. [2020-07-20 03:34:03,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-20 03:34:03,070 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 03:34:03,070 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 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] [2020-07-20 03:34:03,285 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-20 03:34:03,286 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 03:34:03,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 03:34:03,286 INFO L82 PathProgramCache]: Analyzing trace with hash -1156896337, now seen corresponding path program 1 times [2020-07-20 03:34:03,287 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_SMT_AM [2020-07-20 03:34:03,287 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1535840916] [2020-07-20 03:34:03,288 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@439c2796 [2020-07-20 03:34:03,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 03:34:03,299 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 03:34:03,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 03:34:03,307 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 03:34:03,324 INFO L174 FreeRefinementEngine]: Strategy CAMEL_SMT_AM found a feasible trace [2020-07-20 03:34:03,324 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 03:34:03,325 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-07-20 03:34:03,381 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 03:34:03 BoogieIcfgContainer [2020-07-20 03:34:03,381 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 03:34:03,384 INFO L168 Benchmark]: Toolchain (without parser) took 7735.87 ms. Allocated memory was 136.3 MB in the beginning and 288.9 MB in the end (delta: 152.6 MB). Free memory was 100.3 MB in the beginning and 243.4 MB in the end (delta: -143.1 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. [2020-07-20 03:34:03,394 INFO L168 Benchmark]: CDTParser took 0.27 ms. Allocated memory is still 136.3 MB. Free memory was 118.1 MB in the beginning and 117.9 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. [2020-07-20 03:34:03,395 INFO L168 Benchmark]: CACSL2BoogieTranslator took 241.40 ms. Allocated memory is still 136.3 MB. Free memory was 99.8 MB in the beginning and 90.1 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. [2020-07-20 03:34:03,399 INFO L168 Benchmark]: Boogie Preprocessor took 22.55 ms. Allocated memory is still 136.3 MB. Free memory was 89.9 MB in the beginning and 88.6 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-07-20 03:34:03,400 INFO L168 Benchmark]: RCFGBuilder took 391.73 ms. Allocated memory was 136.3 MB in the beginning and 200.8 MB in the end (delta: 64.5 MB). Free memory was 88.6 MB in the beginning and 166.9 MB in the end (delta: -78.4 MB). Peak memory consumption was 13.9 MB. Max. memory is 7.1 GB. [2020-07-20 03:34:03,402 INFO L168 Benchmark]: TraceAbstraction took 7073.23 ms. Allocated memory was 200.8 MB in the beginning and 288.9 MB in the end (delta: 88.1 MB). Free memory was 166.3 MB in the beginning and 243.4 MB in the end (delta: -77.2 MB). Peak memory consumption was 10.9 MB. Max. memory is 7.1 GB. [2020-07-20 03:34:03,410 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27 ms. Allocated memory is still 136.3 MB. Free memory was 118.1 MB in the beginning and 117.9 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 241.40 ms. Allocated memory is still 136.3 MB. Free memory was 99.8 MB in the beginning and 90.1 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 22.55 ms. Allocated memory is still 136.3 MB. Free memory was 89.9 MB in the beginning and 88.6 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 391.73 ms. Allocated memory was 136.3 MB in the beginning and 200.8 MB in the end (delta: 64.5 MB). Free memory was 88.6 MB in the beginning and 166.9 MB in the end (delta: -78.4 MB). Peak memory consumption was 13.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 7073.23 ms. Allocated memory was 200.8 MB in the beginning and 288.9 MB in the end (delta: 88.1 MB). Free memory was 166.3 MB in the beginning and 243.4 MB in the end (delta: -77.2 MB). Peak memory consumption was 10.9 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 39]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L36] int x = 4; VAL [x=4] [L37] CALL, EXPR fibo1(x) VAL [\old(n)=4] [L8] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L10] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=3] [L18] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L20] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=3, fibo1(n-1)=1, n=3] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=4, fibo2(n-1)=2, n=4] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=4, fibo2(n-1)=2, fibo2(n-2)=1, n=4] [L13] return fibo2(n-1) + fibo2(n-2); [L37] RET, EXPR fibo1(x) VAL [fibo1(x)=3, x=4] [L37] int result = fibo1(x); [L38] COND TRUE result == 3 VAL [result=3, x=4] [L39] __VERIFIER_error() VAL [result=3, x=4] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 6.9s, OverallIterations: 10, TraceHistogramMax: 5, AutomataDifference: 2.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 260 SDtfs, 349 SDslu, 1349 SDs, 0 SdLazy, 1776 SolverSat, 292 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 539 GetRequests, 412 SyntacticMatches, 0 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 254 ImplicationChecksByTransitivity, 1.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=142occurred in iteration=7, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 9 MinimizatonAttempts, 70 StatesRemovedByMinimization, 7 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 1.8s InterpolantComputationTime, 715 NumberOfCodeBlocks, 685 NumberOfCodeBlocksAsserted, 34 NumberOfCheckSat, 631 ConstructedInterpolants, 0 QuantifiedInterpolants, 52071 SizeOfPredicates, 25 NumberOfNonLiveVariables, 656 ConjunctsInSsa, 50 ConjunctsInUnsatCore, 16 InterpolantComputations, 2 PerfectInterpolantSequences, 331/432 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...