./Ultimate.py --spec ../../sv-benchmarks/c/ReachSafety.prp --file ../../sv-benchmarks/c/recursive-simple/afterrec_2calls_false-unreach-call_true-termination.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 5842f4b8 Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_d89a261d-b6dd-4991-8d10-6d9e83612310/bin-2019/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_d89a261d-b6dd-4991-8d10-6d9e83612310/bin-2019/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_d89a261d-b6dd-4991-8d10-6d9e83612310/bin-2019/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_d89a261d-b6dd-4991-8d10-6d9e83612310/bin-2019/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/afterrec_2calls_false-unreach-call_true-termination.c -s /tmp/vcloud-vcloud-master/worker/working_dir_d89a261d-b6dd-4991-8d10-6d9e83612310/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_d89a261d-b6dd-4991-8d10-6d9e83612310/bin-2019/utaipan --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 Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 7757e3f263599cd02799bfad01adb3bcaa895e82 ............................................................................................................................................................................................................................................................................................. 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 0.1.23-5842f4b [2018-11-18 08:52:21,393 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-18 08:52:21,395 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-18 08:52:21,403 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-18 08:52:21,403 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-18 08:52:21,404 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-18 08:52:21,404 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-18 08:52:21,405 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-18 08:52:21,406 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-18 08:52:21,407 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-18 08:52:21,408 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-18 08:52:21,408 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-18 08:52:21,409 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-18 08:52:21,409 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-18 08:52:21,410 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-18 08:52:21,410 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-18 08:52:21,411 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-18 08:52:21,412 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-18 08:52:21,413 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-18 08:52:21,414 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-18 08:52:21,415 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-18 08:52:21,416 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-18 08:52:21,417 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-18 08:52:21,418 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-18 08:52:21,418 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-18 08:52:21,418 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-18 08:52:21,419 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-18 08:52:21,419 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-18 08:52:21,420 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-18 08:52:21,421 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-18 08:52:21,421 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-18 08:52:21,421 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-11-18 08:52:21,422 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-11-18 08:52:21,422 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-11-18 08:52:21,422 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-11-18 08:52:21,423 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-11-18 08:52:21,423 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_d89a261d-b6dd-4991-8d10-6d9e83612310/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-11-18 08:52:21,433 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-18 08:52:21,433 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-18 08:52:21,434 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-18 08:52:21,434 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-18 08:52:21,434 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-11-18 08:52:21,434 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-18 08:52:21,434 INFO L133 SettingsManager]: * Explicit value domain=true [2018-11-18 08:52:21,434 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-18 08:52:21,434 INFO L133 SettingsManager]: * Octagon Domain=false [2018-11-18 08:52:21,435 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-18 08:52:21,435 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-18 08:52:21,435 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-18 08:52:21,435 INFO L133 SettingsManager]: * Interval Domain=false [2018-11-18 08:52:21,436 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-18 08:52:21,436 INFO L133 SettingsManager]: * sizeof long=4 [2018-11-18 08:52:21,436 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-18 08:52:21,436 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-11-18 08:52:21,436 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-18 08:52:21,436 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-18 08:52:21,436 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-18 08:52:21,437 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-18 08:52:21,437 INFO L133 SettingsManager]: * sizeof long double=12 [2018-11-18 08:52:21,437 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-18 08:52:21,437 INFO L133 SettingsManager]: * Use constant arrays=true [2018-11-18 08:52:21,437 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-18 08:52:21,437 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-18 08:52:21,437 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-18 08:52:21,438 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-18 08:52:21,438 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-18 08:52:21,438 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-18 08:52:21,438 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-18 08:52:21,438 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-18 08:52:21,438 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-18 08:52:21,438 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-18 08:52:21,439 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-18 08:52:21,439 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-18 08:52:21,439 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-18 08:52:21,439 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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 -> /tmp/vcloud-vcloud-master/worker/working_dir_d89a261d-b6dd-4991-8d10-6d9e83612310/bin-2019/utaipan 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 -> Taipan 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 -> 7757e3f263599cd02799bfad01adb3bcaa895e82 [2018-11-18 08:52:21,465 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-18 08:52:21,474 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-18 08:52:21,477 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-18 08:52:21,478 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-18 08:52:21,478 INFO L276 PluginConnector]: CDTParser initialized [2018-11-18 08:52:21,479 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_d89a261d-b6dd-4991-8d10-6d9e83612310/bin-2019/utaipan/../../sv-benchmarks/c/recursive-simple/afterrec_2calls_false-unreach-call_true-termination.c [2018-11-18 08:52:21,512 INFO L221 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_d89a261d-b6dd-4991-8d10-6d9e83612310/bin-2019/utaipan/data/b0310bc04/1774bb8132054f50aa38fbbdda3c7343/FLAG88a9ab179 [2018-11-18 08:52:21,912 INFO L307 CDTParser]: Found 1 translation units. [2018-11-18 08:52:21,912 INFO L161 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_d89a261d-b6dd-4991-8d10-6d9e83612310/sv-benchmarks/c/recursive-simple/afterrec_2calls_false-unreach-call_true-termination.c [2018-11-18 08:52:21,916 INFO L355 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_d89a261d-b6dd-4991-8d10-6d9e83612310/bin-2019/utaipan/data/b0310bc04/1774bb8132054f50aa38fbbdda3c7343/FLAG88a9ab179 [2018-11-18 08:52:21,925 INFO L363 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_d89a261d-b6dd-4991-8d10-6d9e83612310/bin-2019/utaipan/data/b0310bc04/1774bb8132054f50aa38fbbdda3c7343 [2018-11-18 08:52:21,926 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-18 08:52:21,927 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-11-18 08:52:21,928 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-18 08:52:21,928 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-18 08:52:21,930 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-18 08:52:21,930 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.11 08:52:21" (1/1) ... [2018-11-18 08:52:21,932 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5639ae20 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 08:52:21, skipping insertion in model container [2018-11-18 08:52:21,932 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.11 08:52:21" (1/1) ... [2018-11-18 08:52:21,938 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-18 08:52:21,949 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-11-18 08:52:22,047 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-18 08:52:22,049 INFO L191 MainTranslator]: Completed pre-run [2018-11-18 08:52:22,056 INFO L201 PostProcessor]: Analyzing one entry point: main [2018-11-18 08:52:22,064 INFO L195 MainTranslator]: Completed translation [2018-11-18 08:52:22,065 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 08:52:22 WrapperNode [2018-11-18 08:52:22,065 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-18 08:52:22,065 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-18 08:52:22,065 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-18 08:52:22,066 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-18 08:52:22,071 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 08:52:22" (1/1) ... [2018-11-18 08:52:22,074 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 08:52:22" (1/1) ... [2018-11-18 08:52:22,077 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-18 08:52:22,078 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-18 08:52:22,078 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-18 08:52:22,078 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-18 08:52:22,083 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 08:52:22" (1/1) ... [2018-11-18 08:52:22,083 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 08:52:22" (1/1) ... [2018-11-18 08:52:22,084 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 08:52:22" (1/1) ... [2018-11-18 08:52:22,084 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 08:52:22" (1/1) ... [2018-11-18 08:52:22,086 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 08:52:22" (1/1) ... [2018-11-18 08:52:22,087 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 08:52:22" (1/1) ... [2018-11-18 08:52:22,088 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 08:52:22" (1/1) ... [2018-11-18 08:52:22,088 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-18 08:52:22,089 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-18 08:52:22,089 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-18 08:52:22,089 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-18 08:52:22,089 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 08:52:22" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_d89a261d-b6dd-4991-8d10-6d9e83612310/bin-2019/utaipan/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 [2018-11-18 08:52:22,179 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-18 08:52:22,179 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-18 08:52:22,179 INFO L130 BoogieDeclarations]: Found specification of procedure f [2018-11-18 08:52:22,179 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2018-11-18 08:52:22,179 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-18 08:52:22,180 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-18 08:52:22,180 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-18 08:52:22,180 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-18 08:52:22,180 INFO L130 BoogieDeclarations]: Found specification of procedure f2 [2018-11-18 08:52:22,180 INFO L138 BoogieDeclarations]: Found implementation of procedure f2 [2018-11-18 08:52:22,284 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-18 08:52:22,284 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 08:52:22 BoogieIcfgContainer [2018-11-18 08:52:22,284 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-18 08:52:22,285 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-18 08:52:22,285 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-18 08:52:22,287 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-18 08:52:22,287 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.11 08:52:21" (1/3) ... [2018-11-18 08:52:22,288 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@33840e6c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.11 08:52:22, skipping insertion in model container [2018-11-18 08:52:22,288 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.11 08:52:22" (2/3) ... [2018-11-18 08:52:22,288 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@33840e6c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.11 08:52:22, skipping insertion in model container [2018-11-18 08:52:22,289 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 08:52:22" (3/3) ... [2018-11-18 08:52:22,290 INFO L112 eAbstractionObserver]: Analyzing ICFG afterrec_2calls_false-unreach-call_true-termination.c [2018-11-18 08:52:22,296 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-18 08:52:22,300 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2018-11-18 08:52:22,312 INFO L257 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2018-11-18 08:52:22,338 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-18 08:52:22,338 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-18 08:52:22,338 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-18 08:52:22,338 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-18 08:52:22,339 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-18 08:52:22,339 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-18 08:52:22,339 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-18 08:52:22,339 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-18 08:52:22,352 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2018-11-18 08:52:22,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-11-18 08:52:22,356 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 08:52:22,356 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 08:52:22,358 INFO L423 AbstractCegarLoop]: === Iteration 1 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION, f2Err0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 08:52:22,362 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 08:52:22,362 INFO L82 PathProgramCache]: Analyzing trace with hash -1662209305, now seen corresponding path program 1 times [2018-11-18 08:52:22,364 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 08:52:22,392 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 08:52:22,392 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 08:52:22,392 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 08:52:22,393 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 08:52:22,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-18 08:52:22,495 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-18 08:52:22,496 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-18 08:52:22,497 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2018-11-18 08:52:22,497 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-18 08:52:22,500 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-18 08:52:22,512 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-18 08:52:22,513 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2018-11-18 08:52:22,515 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 7 states. [2018-11-18 08:52:22,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-18 08:52:22,602 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2018-11-18 08:52:22,603 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-11-18 08:52:22,603 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2018-11-18 08:52:22,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-18 08:52:22,609 INFO L225 Difference]: With dead ends: 34 [2018-11-18 08:52:22,609 INFO L226 Difference]: Without dead ends: 22 [2018-11-18 08:52:22,612 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2018-11-18 08:52:22,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-11-18 08:52:22,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-11-18 08:52:22,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-11-18 08:52:22,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-11-18 08:52:22,636 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 13 [2018-11-18 08:52:22,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-18 08:52:22,636 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-11-18 08:52:22,636 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-18 08:52:22,636 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-11-18 08:52:22,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2018-11-18 08:52:22,637 INFO L367 BasicCegarLoop]: Found error trace [2018-11-18 08:52:22,637 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-18 08:52:22,637 INFO L423 AbstractCegarLoop]: === Iteration 2 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION, f2Err0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-18 08:52:22,638 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-18 08:52:22,638 INFO L82 PathProgramCache]: Analyzing trace with hash -1078403623, now seen corresponding path program 1 times [2018-11-18 08:52:22,638 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-18 08:52:22,639 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 08:52:22,639 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-18 08:52:22,639 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-18 08:52:22,639 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-18 08:52:22,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-11-18 08:52:22,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-11-18 08:52:22,663 INFO L442 BasicCegarLoop]: Counterexample might be feasible [2018-11-18 08:52:22,678 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.11 08:52:22 BoogieIcfgContainer [2018-11-18 08:52:22,678 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-11-18 08:52:22,679 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-11-18 08:52:22,679 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-11-18 08:52:22,679 INFO L276 PluginConnector]: Witness Printer initialized [2018-11-18 08:52:22,679 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.11 08:52:22" (3/4) ... [2018-11-18 08:52:22,681 INFO L138 WitnessPrinter]: Generating witness for reachability counterexample [2018-11-18 08:52:22,705 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_d89a261d-b6dd-4991-8d10-6d9e83612310/bin-2019/utaipan/witness.graphml [2018-11-18 08:52:22,705 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-11-18 08:52:22,706 INFO L168 Benchmark]: Toolchain (without parser) took 779.07 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 178.3 MB). Free memory was 953.8 MB in the beginning and 1.1 GB in the end (delta: -168.7 MB). Peak memory consumption was 9.6 MB. Max. memory is 11.5 GB. [2018-11-18 08:52:22,707 INFO L168 Benchmark]: CDTParser took 0.12 ms. Allocated memory is still 1.0 GB. Free memory is still 980.1 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-18 08:52:22,707 INFO L168 Benchmark]: CACSL2BoogieTranslator took 137.37 ms. Allocated memory is still 1.0 GB. Free memory was 953.8 MB in the beginning and 943.0 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2018-11-18 08:52:22,707 INFO L168 Benchmark]: Boogie Procedure Inliner took 12.16 ms. Allocated memory is still 1.0 GB. Free memory is still 943.0 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-18 08:52:22,708 INFO L168 Benchmark]: Boogie Preprocessor took 10.66 ms. Allocated memory is still 1.0 GB. Free memory was 943.0 MB in the beginning and 940.3 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 11.5 GB. [2018-11-18 08:52:22,708 INFO L168 Benchmark]: RCFGBuilder took 195.93 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 178.3 MB). Free memory was 940.3 MB in the beginning and 1.2 GB in the end (delta: -224.0 MB). Peak memory consumption was 19.8 MB. Max. memory is 11.5 GB. [2018-11-18 08:52:22,708 INFO L168 Benchmark]: TraceAbstraction took 393.59 ms. Allocated memory is still 1.2 GB. Free memory was 1.2 GB in the beginning and 1.1 GB in the end (delta: 38.5 MB). Peak memory consumption was 38.5 MB. Max. memory is 11.5 GB. [2018-11-18 08:52:22,709 INFO L168 Benchmark]: Witness Printer took 26.52 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 3.4 MB). Peak memory consumption was 3.4 MB. Max. memory is 11.5 GB. [2018-11-18 08:52:22,711 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.12 ms. Allocated memory is still 1.0 GB. Free memory is still 980.1 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 137.37 ms. Allocated memory is still 1.0 GB. Free memory was 953.8 MB in the beginning and 943.0 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 12.16 ms. Allocated memory is still 1.0 GB. Free memory is still 943.0 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 10.66 ms. Allocated memory is still 1.0 GB. Free memory was 943.0 MB in the beginning and 940.3 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 11.5 GB. * RCFGBuilder took 195.93 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 178.3 MB). Free memory was 940.3 MB in the beginning and 1.2 GB in the end (delta: -224.0 MB). Peak memory consumption was 19.8 MB. Max. memory is 11.5 GB. * TraceAbstraction took 393.59 ms. Allocated memory is still 1.2 GB. Free memory was 1.2 GB in the beginning and 1.1 GB in the end (delta: 38.5 MB). Peak memory consumption was 38.5 MB. Max. memory is 11.5 GB. * Witness Printer took 26.52 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 3.4 MB). Peak memory consumption was 3.4 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 17]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L21] CALL f(4) VAL [\old(n)=4] [L7] COND FALSE !(n<3) [L8] n-- VAL [\old(n)=4, n=3] [L9] CALL f2(n) VAL [\old(n)=3] [L14] COND FALSE !(n<3) [L15] n-- VAL [\old(n)=3, n=2] [L16] CALL f(n) VAL [\old(n)=2] [L7] COND TRUE, RET n<3 VAL [\old(n)=2, n=2] [L16] f(n) VAL [\old(n)=3, n=2] [L17] __VERIFIER_error() VAL [\old(n)=3, n=2] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 23 locations, 2 error locations. UNSAFE Result, 0.3s OverallTime, 2 OverallIterations, 2 TraceHistogramMax, 0.1s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 14 SDtfs, 3 SDslu, 61 SDs, 0 SdLazy, 33 SolverSat, 3 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=23occurred 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, 1 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.0s InterpolantComputationTime, 29 NumberOfCodeBlocks, 29 NumberOfCodeBlocksAsserted, 2 NumberOfCheckSat, 12 ConstructedInterpolants, 0 QuantifiedInterpolants, 288 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 1 InterpolantComputations, 1 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...