/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=BIGGEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_2-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 17:19:06,026 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 17:19:06,028 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 17:19:06,052 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 17:19:06,053 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 17:19:06,054 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 17:19:06,055 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 17:19:06,057 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 17:19:06,059 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 17:19:06,059 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 17:19:06,060 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 17:19:06,062 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 17:19:06,062 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 17:19:06,063 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 17:19:06,064 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 17:19:06,065 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 17:19:06,066 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 17:19:06,067 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 17:19:06,068 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 17:19:06,070 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 17:19:06,072 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 17:19:06,073 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 17:19:06,074 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 17:19:06,075 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 17:19:06,077 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 17:19:06,078 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 17:19:06,078 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 17:19:06,079 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 17:19:06,079 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 17:19:06,080 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-21 17:19:06,081 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-21 17:19:06,081 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-21 17:19:06,082 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-21 17:19:06,083 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-21 17:19:06,084 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-21 17:19:06,084 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-21 17:19:06,085 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-21 17:19:06,085 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-21 17:19:06,085 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 17:19:06,086 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 17:19:06,087 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 17:19:06,088 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 17:19:06,110 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 17:19:06,110 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 17:19:06,115 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 17:19:06,115 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 17:19:06,116 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 17:19:06,116 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 17:19:06,116 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 17:19:06,116 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 17:19:06,116 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 17:19:06,117 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 17:19:06,117 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 17:19:06,117 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 17:19:06,117 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 17:19:06,117 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 17:19:06,120 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 17:19:06,120 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 17:19:06,120 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 17:19:06,120 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 17:19:06,121 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 17:19:06,121 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 17:19:06,121 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 17:19:06,121 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 17:19:06,121 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 17:19:06,122 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 17:19:06,122 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 17:19:06,122 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 17:19:06,122 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 17:19:06,122 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 17:19:06,123 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 17:19:06,126 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true; [2020-08-21 17:19:06,450 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 17:19:06,464 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 17:19:06,468 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 17:19:06,470 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 17:19:06,470 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 17:19:06,471 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_2-1.c [2020-08-21 17:19:06,549 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/06c9628ec/6937cd3735c44871bdbcbb2a0d9af1f2/FLAG449228e44 [2020-08-21 17:19:07,049 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 17:19:07,050 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/fibo_2calls_2-1.c [2020-08-21 17:19:07,057 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/06c9628ec/6937cd3735c44871bdbcbb2a0d9af1f2/FLAG449228e44 [2020-08-21 17:19:07,463 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/06c9628ec/6937cd3735c44871bdbcbb2a0d9af1f2 [2020-08-21 17:19:07,475 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 17:19:07,477 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 17:19:07,480 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 17:19:07,480 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 17:19:07,484 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 17:19:07,486 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 05:19:07" (1/1) ... [2020-08-21 17:19:07,495 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@59f0ef37 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:19:07, skipping insertion in model container [2020-08-21 17:19:07,496 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 05:19:07" (1/1) ... [2020-08-21 17:19:07,505 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 17:19:07,537 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 17:19:07,732 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 17:19:07,737 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 17:19:07,755 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 17:19:07,770 INFO L208 MainTranslator]: Completed translation [2020-08-21 17:19:07,771 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:19:07 WrapperNode [2020-08-21 17:19:07,771 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 17:19:07,772 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 17:19:07,772 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 17:19:07,772 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 17:19:07,786 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:19:07" (1/1) ... [2020-08-21 17:19:07,787 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:19:07" (1/1) ... [2020-08-21 17:19:07,880 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:19:07" (1/1) ... [2020-08-21 17:19:07,881 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:19:07" (1/1) ... [2020-08-21 17:19:07,885 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:19:07" (1/1) ... [2020-08-21 17:19:07,889 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:19:07" (1/1) ... [2020-08-21 17:19:07,894 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:19:07" (1/1) ... [2020-08-21 17:19:07,901 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 17:19:07,902 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 17:19:07,902 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 17:19:07,902 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 17:19:07,903 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:19:07" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 17:19:07,960 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 17:19:07,961 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 17:19:07,961 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-08-21 17:19:07,961 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-08-21 17:19:07,961 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 17:19:07,961 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 17:19:07,961 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 17:19:07,962 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-08-21 17:19:07,962 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-08-21 17:19:07,962 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 17:19:07,962 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 17:19:07,962 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 17:19:08,166 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 17:19:08,166 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-21 17:19:08,171 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 05:19:08 BoogieIcfgContainer [2020-08-21 17:19:08,171 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 17:19:08,172 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 17:19:08,173 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 17:19:08,176 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 17:19:08,176 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 05:19:07" (1/3) ... [2020-08-21 17:19:08,177 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d84e71f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 05:19:08, skipping insertion in model container [2020-08-21 17:19:08,177 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:19:07" (2/3) ... [2020-08-21 17:19:08,178 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d84e71f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 05:19:08, skipping insertion in model container [2020-08-21 17:19:08,178 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 05:19:08" (3/3) ... [2020-08-21 17:19:08,183 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_2-1.c [2020-08-21 17:19:08,195 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 17:19:08,203 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 17:19:08,221 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 17:19:08,264 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 17:19:08,264 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 17:19:08,265 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 17:19:08,265 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 17:19:08,265 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 17:19:08,265 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 17:19:08,265 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 17:19:08,266 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 17:19:08,294 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-08-21 17:19:08,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 17:19:08,324 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:19:08,326 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:19:08,326 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:19:08,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:19:08,333 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-08-21 17:19:08,344 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:19:08,345 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [612758508] [2020-08-21 17:19:08,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:19:08,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:19:08,498 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:19:08,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:19:08,503 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 17:19:08,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:19:08,547 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:19:08,548 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [612758508] [2020-08-21 17:19:08,549 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 17:19:08,550 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 17:19:08,551 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1870181636] [2020-08-21 17:19:08,557 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 17:19:08,557 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:19:08,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 17:19:08,573 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 17:19:08,575 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-08-21 17:19:08,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:19:08,698 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-08-21 17:19:08,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 17:19:08,700 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-21 17:19:08,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:19:08,711 INFO L225 Difference]: With dead ends: 44 [2020-08-21 17:19:08,712 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 17:19:08,715 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 [2020-08-21 17:19:08,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 17:19:08,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-21 17:19:08,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-21 17:19:08,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-08-21 17:19:08,760 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-08-21 17:19:08,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:19:08,761 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-08-21 17:19:08,761 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 17:19:08,761 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-08-21 17:19:08,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-21 17:19:08,763 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:19:08,763 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:19:08,764 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 17:19:08,764 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:19:08,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:19:08,764 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-08-21 17:19:08,765 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:19:08,765 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1843044463] [2020-08-21 17:19:08,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:19:08,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:19:08,795 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:19:08,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:19:08,798 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 17:19:08,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:19:08,829 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:19:08,830 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1843044463] [2020-08-21 17:19:08,830 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 17:19:08,830 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 17:19:08,831 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [755720686] [2020-08-21 17:19:08,832 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 17:19:08,833 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:19:08,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 17:19:08,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 17:19:08,834 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-08-21 17:19:08,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:19:08,911 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-08-21 17:19:08,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 17:19:08,912 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-08-21 17:19:08,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:19:08,913 INFO L225 Difference]: With dead ends: 36 [2020-08-21 17:19:08,914 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 17:19:08,915 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 [2020-08-21 17:19:08,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 17:19:08,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-08-21 17:19:08,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-21 17:19:08,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-08-21 17:19:08,925 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-08-21 17:19:08,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:19:08,926 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-08-21 17:19:08,926 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 17:19:08,926 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-08-21 17:19:08,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 17:19:08,928 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:19:08,928 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] [2020-08-21 17:19:08,928 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 17:19:08,928 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:19:08,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:19:08,929 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-08-21 17:19:08,929 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:19:08,930 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1442505087] [2020-08-21 17:19:08,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:19:08,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:19:08,974 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:19:08,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:19:08,977 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 17:19:08,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:19:09,020 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 17:19:09,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:19:09,046 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-08-21 17:19:09,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:19:09,055 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-21 17:19:09,055 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1442505087] [2020-08-21 17:19:09,056 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:19:09,056 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 17:19:09,056 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1252853422] [2020-08-21 17:19:09,057 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 17:19:09,057 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:19:09,057 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 17:19:09,058 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-21 17:19:09,058 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 7 states. [2020-08-21 17:19:09,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:19:09,145 INFO L93 Difference]: Finished difference Result 58 states and 78 transitions. [2020-08-21 17:19:09,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 17:19:09,146 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 26 [2020-08-21 17:19:09,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:19:09,148 INFO L225 Difference]: With dead ends: 58 [2020-08-21 17:19:09,148 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 17:19:09,150 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-08-21 17:19:09,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 17:19:09,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2020-08-21 17:19:09,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-21 17:19:09,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 39 transitions. [2020-08-21 17:19:09,160 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 39 transitions. Word has length 26 [2020-08-21 17:19:09,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:19:09,160 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 39 transitions. [2020-08-21 17:19:09,161 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 17:19:09,161 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 39 transitions. [2020-08-21 17:19:09,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-21 17:19:09,162 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:19:09,163 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] [2020-08-21 17:19:09,163 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 17:19:09,163 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:19:09,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:19:09,164 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-08-21 17:19:09,164 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:19:09,165 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [429207522] [2020-08-21 17:19:09,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:19:09,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-21 17:19:09,185 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-21 17:19:09,185 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-21 17:19:09,190 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 17:19:09,228 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 05:19:09 BoogieIcfgContainer [2020-08-21 17:19:09,228 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 17:19:09,233 INFO L168 Benchmark]: Toolchain (without parser) took 1753.62 ms. Allocated memory was 138.9 MB in the beginning and 201.3 MB in the end (delta: 62.4 MB). Free memory was 101.4 MB in the beginning and 100.7 MB in the end (delta: 705.1 kB). Peak memory consumption was 63.1 MB. Max. memory is 7.1 GB. [2020-08-21 17:19:09,234 INFO L168 Benchmark]: CDTParser took 0.29 ms. Allocated memory is still 138.9 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-08-21 17:19:09,236 INFO L168 Benchmark]: CACSL2BoogieTranslator took 291.60 ms. Allocated memory is still 138.9 MB. Free memory was 101.2 MB in the beginning and 91.7 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. [2020-08-21 17:19:09,238 INFO L168 Benchmark]: Boogie Preprocessor took 129.28 ms. Allocated memory was 138.9 MB in the beginning and 201.3 MB in the end (delta: 62.4 MB). Free memory was 91.7 MB in the beginning and 179.3 MB in the end (delta: -87.6 MB). Peak memory consumption was 13.0 MB. Max. memory is 7.1 GB. [2020-08-21 17:19:09,240 INFO L168 Benchmark]: RCFGBuilder took 269.43 ms. Allocated memory is still 201.3 MB. Free memory was 179.3 MB in the beginning and 165.7 MB in the end (delta: 13.6 MB). Peak memory consumption was 13.6 MB. Max. memory is 7.1 GB. [2020-08-21 17:19:09,245 INFO L168 Benchmark]: TraceAbstraction took 1056.03 ms. Allocated memory is still 201.3 MB. Free memory was 165.7 MB in the beginning and 100.7 MB in the end (delta: 65.0 MB). Peak memory consumption was 65.0 MB. Max. memory is 7.1 GB. [2020-08-21 17:19:09,255 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.29 ms. Allocated memory is still 138.9 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 291.60 ms. Allocated memory is still 138.9 MB. Free memory was 101.2 MB in the beginning and 91.7 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 129.28 ms. Allocated memory was 138.9 MB in the beginning and 201.3 MB in the end (delta: 62.4 MB). Free memory was 91.7 MB in the beginning and 179.3 MB in the end (delta: -87.6 MB). Peak memory consumption was 13.0 MB. Max. memory is 7.1 GB. * RCFGBuilder took 269.43 ms. Allocated memory is still 201.3 MB. Free memory was 179.3 MB in the beginning and 165.7 MB in the end (delta: 13.6 MB). Peak memory consumption was 13.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1056.03 ms. Allocated memory is still 201.3 MB. Free memory was 165.7 MB in the beginning and 100.7 MB in the end (delta: 65.0 MB). Peak memory consumption was 65.0 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 = 2; [L37] CALL, EXPR fibo1(x) [L8] COND FALSE !(n < 1) [L10] COND FALSE !(n == 1) [L13] CALL, EXPR fibo2(n-1) [L18] COND FALSE !(n < 1) [L20] COND TRUE n == 1 [L21] return 1; [L13] RET, EXPR fibo2(n-1) [L13] CALL, EXPR fibo2(n-2) [L18] COND TRUE n < 1 [L19] return 0; [L13] RET, EXPR fibo2(n-2) [L13] return fibo2(n-1) + fibo2(n-2); [L37] RET, EXPR fibo1(x) [L37] int result = fibo1(x); [L38] COND TRUE result == 1 [L39] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 0.9s, OverallIterations: 4, TraceHistogramMax: 2, AutomataDifference: 0.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 91 SDtfs, 43 SDslu, 232 SDs, 0 SdLazy, 107 SolverSat, 4 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 34 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=33occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 3 MinimizatonAttempts, 4 StatesRemovedByMinimization, 2 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.2s InterpolantComputationTime, 80 NumberOfCodeBlocks, 80 NumberOfCodeBlocksAsserted, 4 NumberOfCheckSat, 50 ConstructedInterpolants, 0 QuantifiedInterpolants, 1464 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 3 InterpolantComputations, 2 PerfectInterpolantSequences, 1/4 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...