./Ultimate.py --spec /storage/repos/svcomp/c/properties/unreach-call.prp --file /storage/repos/svcomp/c/recursive-simple/fibo_2calls_2_false-unreach-call_true-termination.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 2e94e6aa Calling Ultimate with: java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx12G -Xms1G -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i /storage/repos/svcomp/c/recursive-simple/fibo_2calls_2_false-unreach-call_true-termination.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 0d7907681604b1ce9d21af31806cc60e045b313d ..................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.1.24-2e94e6a [2018-12-31 09:52:47,780 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-31 09:52:47,782 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-31 09:52:47,800 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-12-31 09:52:47,802 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-12-31 09:52:47,803 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-12-31 09:52:47,805 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-12-31 09:52:47,808 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-12-31 09:52:47,812 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-12-31 09:52:47,813 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-12-31 09:52:47,815 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-12-31 09:52:47,816 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-12-31 09:52:47,818 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-12-31 09:52:47,819 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-12-31 09:52:47,821 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-12-31 09:52:47,821 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-12-31 09:52:47,823 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-12-31 09:52:47,825 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-12-31 09:52:47,827 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-12-31 09:52:47,830 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-12-31 09:52:47,831 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-12-31 09:52:47,832 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-12-31 09:52:47,835 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-12-31 09:52:47,835 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-12-31 09:52:47,836 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-12-31 09:52:47,836 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-12-31 09:52:47,838 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-12-31 09:52:47,839 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-12-31 09:52:47,840 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-12-31 09:52:47,841 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-12-31 09:52:47,841 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-12-31 09:52:47,841 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-12-31 09:52:47,842 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-12-31 09:52:47,842 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-12-31 09:52:47,843 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-12-31 09:52:47,844 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-12-31 09:52:47,844 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2018-12-31 09:52:47,872 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-31 09:52:47,872 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-31 09:52:47,876 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-12-31 09:52:47,877 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-12-31 09:52:47,878 INFO L133 SettingsManager]: * Use SBE=true [2018-12-31 09:52:47,878 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-31 09:52:47,878 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-31 09:52:47,878 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-31 09:52:47,878 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-31 09:52:47,879 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-31 09:52:47,879 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-31 09:52:47,879 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-31 09:52:47,879 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-31 09:52:47,879 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-31 09:52:47,879 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-31 09:52:47,879 INFO L133 SettingsManager]: * Use constant arrays=true [2018-12-31 09:52:47,881 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-31 09:52:47,881 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-31 09:52:47,881 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-31 09:52:47,881 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-12-31 09:52:47,882 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-31 09:52:47,882 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-31 09:52:47,882 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-31 09:52:47,882 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-31 09:52:47,882 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-31 09:52:47,882 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-12-31 09:52:47,884 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-31 09:52:47,884 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-31 09:52:47,884 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0d7907681604b1ce9d21af31806cc60e045b313d [2018-12-31 09:52:47,942 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-31 09:52:47,957 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-31 09:52:47,963 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-31 09:52:47,965 INFO L271 PluginConnector]: Initializing CDTParser... [2018-12-31 09:52:47,965 INFO L276 PluginConnector]: CDTParser initialized [2018-12-31 09:52:47,966 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/svcomp/c/recursive-simple/fibo_2calls_2_false-unreach-call_true-termination.c [2018-12-31 09:52:48,034 INFO L221 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/866bdf599/f1834acc1a1f4399b1e4ab3b8af7adc0/FLAG6b282a4e8 [2018-12-31 09:52:48,477 INFO L307 CDTParser]: Found 1 translation units. [2018-12-31 09:52:48,478 INFO L161 CDTParser]: Scanning /storage/repos/svcomp/c/recursive-simple/fibo_2calls_2_false-unreach-call_true-termination.c [2018-12-31 09:52:48,485 INFO L355 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/866bdf599/f1834acc1a1f4399b1e4ab3b8af7adc0/FLAG6b282a4e8 [2018-12-31 09:52:48,857 INFO L363 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/866bdf599/f1834acc1a1f4399b1e4ab3b8af7adc0 [2018-12-31 09:52:48,861 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-31 09:52:48,863 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-12-31 09:52:48,864 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-12-31 09:52:48,864 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-12-31 09:52:48,868 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-12-31 09:52:48,869 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.12 09:52:48" (1/1) ... [2018-12-31 09:52:48,874 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7cf8cf00 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.12 09:52:48, skipping insertion in model container [2018-12-31 09:52:48,875 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.12 09:52:48" (1/1) ... [2018-12-31 09:52:48,886 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-12-31 09:52:48,907 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-12-31 09:52:49,131 INFO L204 PostProcessor]: Analyzing one entry point: main [2018-12-31 09:52:49,138 INFO L191 MainTranslator]: Completed pre-run [2018-12-31 09:52:49,164 INFO L204 PostProcessor]: Analyzing one entry point: main [2018-12-31 09:52:49,179 INFO L195 MainTranslator]: Completed translation [2018-12-31 09:52:49,180 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.12 09:52:49 WrapperNode [2018-12-31 09:52:49,180 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-12-31 09:52:49,181 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-31 09:52:49,181 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-31 09:52:49,181 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-31 09:52:49,189 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.12 09:52:49" (1/1) ... [2018-12-31 09:52:49,194 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.12 09:52:49" (1/1) ... [2018-12-31 09:52:49,214 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-31 09:52:49,214 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-31 09:52:49,214 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-31 09:52:49,214 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-31 09:52:49,226 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.12 09:52:49" (1/1) ... [2018-12-31 09:52:49,226 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.12 09:52:49" (1/1) ... [2018-12-31 09:52:49,228 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.12 09:52:49" (1/1) ... [2018-12-31 09:52:49,229 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.12 09:52:49" (1/1) ... [2018-12-31 09:52:49,232 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.12 09:52:49" (1/1) ... [2018-12-31 09:52:49,236 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.12 09:52:49" (1/1) ... [2018-12-31 09:52:49,237 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.12 09:52:49" (1/1) ... [2018-12-31 09:52:49,239 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-31 09:52:49,239 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-31 09:52:49,240 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-31 09:52:49,240 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-31 09:52:49,241 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.12 09:52:49" (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 [2018-12-31 09:52:49,383 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-12-31 09:52:49,383 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-12-31 09:52:49,383 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2018-12-31 09:52:49,384 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2018-12-31 09:52:49,384 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2018-12-31 09:52:49,384 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2018-12-31 09:52:49,776 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-12-31 09:52:49,776 INFO L280 CfgBuilder]: Removed 4 assue(true) statements. [2018-12-31 09:52:49,777 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.12 09:52:49 BoogieIcfgContainer [2018-12-31 09:52:49,777 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-31 09:52:49,778 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-31 09:52:49,778 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-31 09:52:49,782 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-31 09:52:49,783 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 31.12 09:52:48" (1/3) ... [2018-12-31 09:52:49,784 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6797614 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.12 09:52:49, skipping insertion in model container [2018-12-31 09:52:49,784 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.12 09:52:49" (2/3) ... [2018-12-31 09:52:49,784 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6797614 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.12 09:52:49, skipping insertion in model container [2018-12-31 09:52:49,785 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.12 09:52:49" (3/3) ... [2018-12-31 09:52:49,787 INFO L112 eAbstractionObserver]: Analyzing ICFG fibo_2calls_2_false-unreach-call_true-termination.c [2018-12-31 09:52:49,799 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-31 09:52:49,810 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-31 09:52:49,831 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-31 09:52:49,869 INFO L133 ementStrategyFactory]: Using default assertion order modulation [2018-12-31 09:52:49,870 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-31 09:52:49,871 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-31 09:52:49,871 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-31 09:52:49,871 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-31 09:52:49,872 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-31 09:52:49,872 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-31 09:52:49,872 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-31 09:52:49,872 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-31 09:52:49,892 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2018-12-31 09:52:49,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2018-12-31 09:52:49,900 INFO L394 BasicCegarLoop]: Found error trace [2018-12-31 09:52:49,901 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-31 09:52:49,904 INFO L423 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-31 09:52:49,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-31 09:52:49,911 INFO L82 PathProgramCache]: Analyzing trace with hash 1871295635, now seen corresponding path program 1 times [2018-12-31 09:52:49,913 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-12-31 09:52:49,914 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-12-31 09:52:49,972 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-31 09:52:49,972 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-31 09:52:49,972 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-31 09:52:50,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-31 09:52:50,160 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-31 09:52:50,165 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-31 09:52:50,167 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-12-31 09:52:50,171 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-12-31 09:52:50,184 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-12-31 09:52:50,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-12-31 09:52:50,187 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 5 states. [2018-12-31 09:52:50,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-31 09:52:50,473 INFO L93 Difference]: Finished difference Result 38 states and 47 transitions. [2018-12-31 09:52:50,474 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-12-31 09:52:50,476 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 9 [2018-12-31 09:52:50,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-31 09:52:50,489 INFO L225 Difference]: With dead ends: 38 [2018-12-31 09:52:50,489 INFO L226 Difference]: Without dead ends: 26 [2018-12-31 09:52:50,494 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-12-31 09:52:50,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-12-31 09:52:50,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-12-31 09:52:50,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-12-31 09:52:50,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2018-12-31 09:52:50,550 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 9 [2018-12-31 09:52:50,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-31 09:52:50,551 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2018-12-31 09:52:50,551 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-12-31 09:52:50,551 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2018-12-31 09:52:50,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-12-31 09:52:50,554 INFO L394 BasicCegarLoop]: Found error trace [2018-12-31 09:52:50,554 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-31 09:52:50,554 INFO L423 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-31 09:52:50,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-31 09:52:50,555 INFO L82 PathProgramCache]: Analyzing trace with hash -1404217650, now seen corresponding path program 1 times [2018-12-31 09:52:50,555 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-12-31 09:52:50,555 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-12-31 09:52:50,556 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-31 09:52:50,558 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-31 09:52:50,558 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-31 09:52:50,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-31 09:52:50,685 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-31 09:52:50,686 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-31 09:52:50,686 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-12-31 09:52:50,688 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-12-31 09:52:50,688 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-12-31 09:52:50,688 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-12-31 09:52:50,689 INFO L87 Difference]: Start difference. First operand 26 states and 33 transitions. Second operand 5 states. [2018-12-31 09:52:51,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-31 09:52:51,012 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2018-12-31 09:52:51,013 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-12-31 09:52:51,014 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2018-12-31 09:52:51,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-31 09:52:51,015 INFO L225 Difference]: With dead ends: 32 [2018-12-31 09:52:51,015 INFO L226 Difference]: Without dead ends: 28 [2018-12-31 09:52:51,017 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-12-31 09:52:51,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-12-31 09:52:51,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2018-12-31 09:52:51,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-12-31 09:52:51,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2018-12-31 09:52:51,025 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 10 [2018-12-31 09:52:51,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-31 09:52:51,025 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2018-12-31 09:52:51,025 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-12-31 09:52:51,026 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2018-12-31 09:52:51,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-12-31 09:52:51,027 INFO L394 BasicCegarLoop]: Found error trace [2018-12-31 09:52:51,027 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-31 09:52:51,028 INFO L423 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-31 09:52:51,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-31 09:52:51,028 INFO L82 PathProgramCache]: Analyzing trace with hash -1629927371, now seen corresponding path program 1 times [2018-12-31 09:52:51,028 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-12-31 09:52:51,028 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-12-31 09:52:51,029 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-31 09:52:51,030 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-31 09:52:51,030 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-31 09:52:51,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-31 09:52:51,230 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-12-31 09:52:51,230 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-12-31 09:52:51,230 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-12-31 09:52:51,247 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-31 09:52:51,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-31 09:52:51,275 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-12-31 09:52:51,329 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-31 09:52:51,354 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2018-12-31 09:52:51,354 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 6 [2018-12-31 09:52:51,355 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-12-31 09:52:51,355 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-12-31 09:52:51,356 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2018-12-31 09:52:51,356 INFO L87 Difference]: Start difference. First operand 26 states and 33 transitions. Second operand 6 states. [2018-12-31 09:52:51,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-31 09:52:51,592 INFO L93 Difference]: Finished difference Result 54 states and 74 transitions. [2018-12-31 09:52:51,593 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-12-31 09:52:51,593 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2018-12-31 09:52:51,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-31 09:52:51,595 INFO L225 Difference]: With dead ends: 54 [2018-12-31 09:52:51,595 INFO L226 Difference]: Without dead ends: 30 [2018-12-31 09:52:51,596 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 22 SyntacticMatches, 2 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2018-12-31 09:52:51,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-12-31 09:52:51,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2018-12-31 09:52:51,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-12-31 09:52:51,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 35 transitions. [2018-12-31 09:52:51,606 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 35 transitions. Word has length 22 [2018-12-31 09:52:51,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-31 09:52:51,607 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 35 transitions. [2018-12-31 09:52:51,607 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-12-31 09:52:51,607 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 35 transitions. [2018-12-31 09:52:51,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-12-31 09:52:51,609 INFO L394 BasicCegarLoop]: Found error trace [2018-12-31 09:52:51,610 INFO L402 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-31 09:52:51,610 INFO L423 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-31 09:52:51,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2018-12-31 09:52:51,611 INFO L82 PathProgramCache]: Analyzing trace with hash 1285987244, now seen corresponding path program 1 times [2018-12-31 09:52:51,611 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-12-31 09:52:51,612 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2018-12-31 09:52:51,613 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-31 09:52:51,613 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-31 09:52:51,614 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-31 09:52:51,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-12-31 09:52:51,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-12-31 09:52:51,663 INFO L469 BasicCegarLoop]: Counterexample might be feasible [2018-12-31 09:52:51,690 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 31.12 09:52:51 BoogieIcfgContainer [2018-12-31 09:52:51,691 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-12-31 09:52:51,691 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-12-31 09:52:51,691 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-12-31 09:52:51,691 INFO L276 PluginConnector]: Witness Printer initialized [2018-12-31 09:52:51,692 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.12 09:52:49" (3/4) ... [2018-12-31 09:52:51,695 INFO L138 WitnessPrinter]: Generating witness for reachability counterexample [2018-12-31 09:52:51,745 INFO L145 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2018-12-31 09:52:51,745 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-12-31 09:52:51,746 INFO L168 Benchmark]: Toolchain (without parser) took 2884.52 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 94.9 MB). Free memory was 952.7 MB in the beginning and 999.4 MB in the end (delta: -46.7 MB). Peak memory consumption was 48.2 MB. Max. memory is 11.5 GB. [2018-12-31 09:52:51,748 INFO L168 Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 1.0 GB. Free memory is still 978.2 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-31 09:52:51,749 INFO L168 Benchmark]: CACSL2BoogieTranslator took 316.40 ms. Allocated memory is still 1.0 GB. Free memory was 952.7 MB in the beginning and 942.0 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2018-12-31 09:52:51,750 INFO L168 Benchmark]: Boogie Procedure Inliner took 33.10 ms. Allocated memory is still 1.0 GB. Free memory is still 942.0 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-31 09:52:51,750 INFO L168 Benchmark]: Boogie Preprocessor took 24.77 ms. Allocated memory is still 1.0 GB. Free memory is still 942.0 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-31 09:52:51,751 INFO L168 Benchmark]: RCFGBuilder took 537.54 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 94.9 MB). Free memory was 942.0 MB in the beginning and 1.1 GB in the end (delta: -126.7 MB). Peak memory consumption was 18.5 MB. Max. memory is 11.5 GB. [2018-12-31 09:52:51,751 INFO L168 Benchmark]: TraceAbstraction took 1912.67 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 999.4 MB in the end (delta: 69.3 MB). Peak memory consumption was 69.3 MB. Max. memory is 11.5 GB. [2018-12-31 09:52:51,752 INFO L168 Benchmark]: Witness Printer took 54.35 ms. Allocated memory is still 1.1 GB. Free memory is still 999.4 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-31 09:52:51,756 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.17 ms. Allocated memory is still 1.0 GB. Free memory is still 978.2 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 316.40 ms. Allocated memory is still 1.0 GB. Free memory was 952.7 MB in the beginning and 942.0 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 33.10 ms. Allocated memory is still 1.0 GB. Free memory is still 942.0 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 24.77 ms. Allocated memory is still 1.0 GB. Free memory is still 942.0 MB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 537.54 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 94.9 MB). Free memory was 942.0 MB in the beginning and 1.1 GB in the end (delta: -126.7 MB). Peak memory consumption was 18.5 MB. Max. memory is 11.5 GB. * TraceAbstraction took 1912.67 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 999.4 MB in the end (delta: 69.3 MB). Peak memory consumption was 69.3 MB. Max. memory is 11.5 GB. * Witness Printer took 54.35 ms. Allocated memory is still 1.1 GB. Free memory is still 999.4 MB. There was no memory consumed. Max. memory is 11.5 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) 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); [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 3 procedures, 28 locations, 1 error locations. UNSAFE Result, 1.8s OverallTime, 4 OverallIterations, 2 TraceHistogramMax, 0.8s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 78 SDtfs, 41 SDslu, 165 SDs, 0 SdLazy, 99 SolverSat, 4 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 41 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=28occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s AbstIntTime, 0 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 3 MinimizatonAttempts, 4 StatesRemovedByMinimization, 2 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.5s InterpolantComputationTime, 86 NumberOfCodeBlocks, 86 NumberOfCodeBlocksAsserted, 5 NumberOfCheckSat, 59 ConstructedInterpolants, 0 QuantifiedInterpolants, 1601 SizeOfPredicates, 2 NumberOfNonLiveVariables, 52 ConjunctsInSsa, 5 ConjunctsInUnsatCore, 4 InterpolantComputations, 3 PerfectInterpolantSequences, 5/8 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...