./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/afterrec_2calls-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version cad46833 Calling Ultimate with: /usr/lib/jvm/java-8-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_e0d2648e-53c0-4326-a19a-d8ac268a2cb7/bin/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_e0d2648e-53c0-4326-a19a-d8ac268a2cb7/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_e0d2648e-53c0-4326-a19a-d8ac268a2cb7/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_e0d2648e-53c0-4326-a19a-d8ac268a2cb7/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/afterrec_2calls-1.c -s /tmp/vcloud-vcloud-master/worker/working_dir_e0d2648e-53c0-4326-a19a-d8ac268a2cb7/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_e0d2648e-53c0-4326-a19a-d8ac268a2cb7/bin/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 0.1.24-cad4683 [2019-10-22 11:24:58,092 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-22 11:24:58,095 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-22 11:24:58,104 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-22 11:24:58,105 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-22 11:24:58,105 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-22 11:24:58,107 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-22 11:24:58,108 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-22 11:24:58,109 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-22 11:24:58,110 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-22 11:24:58,111 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-22 11:24:58,112 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-22 11:24:58,112 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-22 11:24:58,113 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-22 11:24:58,114 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-22 11:24:58,115 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-22 11:24:58,115 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-22 11:24:58,116 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-22 11:24:58,117 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-22 11:24:58,119 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-22 11:24:58,120 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-22 11:24:58,121 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-22 11:24:58,122 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-22 11:24:58,122 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-22 11:24:58,124 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-10-22 11:24:58,125 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-10-22 11:24:58,125 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-10-22 11:24:58,126 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-10-22 11:24:58,126 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-10-22 11:24:58,127 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-10-22 11:24:58,127 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-22 11:24:58,128 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-22 11:24:58,128 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-22 11:24:58,129 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-22 11:24:58,130 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-22 11:24:58,130 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-22 11:24:58,131 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-22 11:24:58,131 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-22 11:24:58,131 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-22 11:24:58,132 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-22 11:24:58,132 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-22 11:24:58,133 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_e0d2648e-53c0-4326-a19a-d8ac268a2cb7/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2019-10-22 11:24:58,144 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-22 11:24:58,144 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-22 11:24:58,145 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-10-22 11:24:58,145 INFO L138 SettingsManager]: * User list type=DISABLED [2019-10-22 11:24:58,145 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-10-22 11:24:58,145 INFO L138 SettingsManager]: * Explicit value domain=true [2019-10-22 11:24:58,145 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-10-22 11:24:58,146 INFO L138 SettingsManager]: * Octagon Domain=false [2019-10-22 11:24:58,146 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2019-10-22 11:24:58,146 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-10-22 11:24:58,146 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2019-10-22 11:24:58,147 INFO L138 SettingsManager]: * Interval Domain=false [2019-10-22 11:24:58,147 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-22 11:24:58,147 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-22 11:24:58,148 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-22 11:24:58,148 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-22 11:24:58,148 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-22 11:24:58,148 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-22 11:24:58,148 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-22 11:24:58,148 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-22 11:24:58,149 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-22 11:24:58,149 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-22 11:24:58,149 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-22 11:24:58,149 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-22 11:24:58,149 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-22 11:24:58,150 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-22 11:24:58,150 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-22 11:24:58,150 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-22 11:24:58,150 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-22 11:24:58,151 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-22 11:24:58,151 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-22 11:24:58,151 INFO L138 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-10-22 11:24:58,151 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-22 11:24:58,151 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-22 11:24:58,151 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-22 11:24:58,152 INFO L138 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_e0d2648e-53c0-4326-a19a-d8ac268a2cb7/bin/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 [2019-10-22 11:24:58,185 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-22 11:24:58,194 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-22 11:24:58,201 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-22 11:24:58,203 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-22 11:24:58,203 INFO L275 PluginConnector]: CDTParser initialized [2019-10-22 11:24:58,204 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_e0d2648e-53c0-4326-a19a-d8ac268a2cb7/bin/utaipan/../../sv-benchmarks/c/recursive-simple/afterrec_2calls-1.c [2019-10-22 11:24:58,256 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_e0d2648e-53c0-4326-a19a-d8ac268a2cb7/bin/utaipan/data/c9f4de6ba/86483039d1a4497a84b18ca5c5e4fcb7/FLAG4a32a9b40 [2019-10-22 11:24:58,628 INFO L306 CDTParser]: Found 1 translation units. [2019-10-22 11:24:58,629 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_e0d2648e-53c0-4326-a19a-d8ac268a2cb7/sv-benchmarks/c/recursive-simple/afterrec_2calls-1.c [2019-10-22 11:24:58,634 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_e0d2648e-53c0-4326-a19a-d8ac268a2cb7/bin/utaipan/data/c9f4de6ba/86483039d1a4497a84b18ca5c5e4fcb7/FLAG4a32a9b40 [2019-10-22 11:24:59,043 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_e0d2648e-53c0-4326-a19a-d8ac268a2cb7/bin/utaipan/data/c9f4de6ba/86483039d1a4497a84b18ca5c5e4fcb7 [2019-10-22 11:24:59,047 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-22 11:24:59,049 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2019-10-22 11:24:59,050 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-22 11:24:59,050 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-22 11:24:59,054 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-22 11:24:59,056 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 11:24:59" (1/1) ... [2019-10-22 11:24:59,059 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6148a24 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 11:24:59, skipping insertion in model container [2019-10-22 11:24:59,059 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 11:24:59" (1/1) ... [2019-10-22 11:24:59,067 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-22 11:24:59,083 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-22 11:24:59,214 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-22 11:24:59,218 INFO L188 MainTranslator]: Completed pre-run [2019-10-22 11:24:59,288 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-22 11:24:59,300 INFO L192 MainTranslator]: Completed translation [2019-10-22 11:24:59,300 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 11:24:59 WrapperNode [2019-10-22 11:24:59,301 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-22 11:24:59,301 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-10-22 11:24:59,301 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-10-22 11:24:59,302 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-10-22 11:24:59,309 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 11:24:59" (1/1) ... [2019-10-22 11:24:59,312 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 11:24:59" (1/1) ... [2019-10-22 11:24:59,323 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-10-22 11:24:59,323 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-22 11:24:59,323 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-22 11:24:59,323 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-22 11:24:59,332 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 11:24:59" (1/1) ... [2019-10-22 11:24:59,332 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 11:24:59" (1/1) ... [2019-10-22 11:24:59,333 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 11:24:59" (1/1) ... [2019-10-22 11:24:59,333 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 11:24:59" (1/1) ... [2019-10-22 11:24:59,334 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 11:24:59" (1/1) ... [2019-10-22 11:24:59,336 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 11:24:59" (1/1) ... [2019-10-22 11:24:59,337 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 11:24:59" (1/1) ... [2019-10-22 11:24:59,338 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-22 11:24:59,338 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-22 11:24:59,338 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-22 11:24:59,338 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-22 11:24:59,339 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 11:24:59" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_e0d2648e-53c0-4326-a19a-d8ac268a2cb7/bin/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 [2019-10-22 11:24:59,406 INFO L130 BoogieDeclarations]: Found specification of procedure f [2019-10-22 11:24:59,406 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2019-10-22 11:24:59,407 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-22 11:24:59,407 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-22 11:24:59,407 INFO L130 BoogieDeclarations]: Found specification of procedure f2 [2019-10-22 11:24:59,407 INFO L138 BoogieDeclarations]: Found implementation of procedure f2 [2019-10-22 11:24:59,555 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-22 11:24:59,555 INFO L284 CfgBuilder]: Removed 4 assume(true) statements. [2019-10-22 11:24:59,556 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 11:24:59 BoogieIcfgContainer [2019-10-22 11:24:59,556 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-22 11:24:59,557 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-22 11:24:59,557 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-22 11:24:59,562 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-22 11:24:59,562 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.10 11:24:59" (1/3) ... [2019-10-22 11:24:59,563 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@67837248 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 11:24:59, skipping insertion in model container [2019-10-22 11:24:59,565 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 11:24:59" (2/3) ... [2019-10-22 11:24:59,565 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@67837248 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 11:24:59, skipping insertion in model container [2019-10-22 11:24:59,565 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 11:24:59" (3/3) ... [2019-10-22 11:24:59,567 INFO L109 eAbstractionObserver]: Analyzing ICFG afterrec_2calls-1.c [2019-10-22 11:24:59,577 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-22 11:24:59,584 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2019-10-22 11:24:59,596 INFO L249 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2019-10-22 11:24:59,615 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-22 11:24:59,615 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-22 11:24:59,616 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-22 11:24:59,616 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-22 11:24:59,616 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-22 11:24:59,616 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-22 11:24:59,616 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-22 11:24:59,616 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-22 11:24:59,630 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2019-10-22 11:24:59,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-10-22 11:24:59,635 INFO L372 BasicCegarLoop]: Found error trace [2019-10-22 11:24:59,636 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-22 11:24:59,638 INFO L410 AbstractCegarLoop]: === Iteration 1 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION, f2Err0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-22 11:24:59,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 11:24:59,643 INFO L82 PathProgramCache]: Analyzing trace with hash 1282022558, now seen corresponding path program 1 times [2019-10-22 11:24:59,651 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-22 11:24:59,651 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1864391446] [2019-10-22 11:24:59,651 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 11:24:59,651 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 11:24:59,652 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-22 11:24:59,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 11:24:59,798 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-22 11:24:59,799 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1864391446] [2019-10-22 11:24:59,800 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-22 11:24:59,800 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2019-10-22 11:24:59,800 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [476718544] [2019-10-22 11:24:59,804 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-22 11:24:59,806 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-22 11:24:59,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-22 11:24:59,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2019-10-22 11:24:59,821 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 7 states. [2019-10-22 11:24:59,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-22 11:24:59,972 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2019-10-22 11:24:59,973 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-22 11:24:59,974 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 10 [2019-10-22 11:24:59,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-22 11:24:59,981 INFO L225 Difference]: With dead ends: 30 [2019-10-22 11:24:59,982 INFO L226 Difference]: Without dead ends: 19 [2019-10-22 11:24:59,984 INFO L600 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 [2019-10-22 11:25:00,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-10-22 11:25:00,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2019-10-22 11:25:00,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-10-22 11:25:00,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2019-10-22 11:25:00,026 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 10 [2019-10-22 11:25:00,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-22 11:25:00,026 INFO L462 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2019-10-22 11:25:00,026 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-22 11:25:00,027 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2019-10-22 11:25:00,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-10-22 11:25:00,027 INFO L372 BasicCegarLoop]: Found error trace [2019-10-22 11:25:00,027 INFO L380 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-22 11:25:00,027 INFO L410 AbstractCegarLoop]: === Iteration 2 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION, f2Err0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-22 11:25:00,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 11:25:00,028 INFO L82 PathProgramCache]: Analyzing trace with hash -1404533112, now seen corresponding path program 1 times [2019-10-22 11:25:00,028 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-22 11:25:00,028 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [686356619] [2019-10-22 11:25:00,028 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 11:25:00,029 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 11:25:00,029 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-22 11:25:00,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-22 11:25:00,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-22 11:25:00,076 INFO L168 tionRefinementEngine]: Strategy TAIPAN found a feasible trace [2019-10-22 11:25:00,076 INFO L445 BasicCegarLoop]: Counterexample might be feasible [2019-10-22 11:25:00,097 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.10 11:25:00 BoogieIcfgContainer [2019-10-22 11:25:00,097 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-10-22 11:25:00,098 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2019-10-22 11:25:00,098 INFO L271 PluginConnector]: Initializing Witness Printer... [2019-10-22 11:25:00,098 INFO L275 PluginConnector]: Witness Printer initialized [2019-10-22 11:25:00,099 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 11:24:59" (3/4) ... [2019-10-22 11:25:00,101 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2019-10-22 11:25:00,145 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_e0d2648e-53c0-4326-a19a-d8ac268a2cb7/bin/utaipan/witness.graphml [2019-10-22 11:25:00,145 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2019-10-22 11:25:00,147 INFO L168 Benchmark]: Toolchain (without parser) took 1097.68 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 136.8 MB). Free memory was 944.5 MB in the beginning and 1.1 GB in the end (delta: -135.2 MB). Peak memory consumption was 1.7 MB. Max. memory is 11.5 GB. [2019-10-22 11:25:00,148 INFO L168 Benchmark]: CDTParser took 0.11 ms. Allocated memory is still 1.0 GB. Free memory is still 967.3 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-10-22 11:25:00,148 INFO L168 Benchmark]: CACSL2BoogieTranslator took 250.93 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 136.8 MB). Free memory was 944.5 MB in the beginning and 1.1 GB in the end (delta: -185.7 MB). Peak memory consumption was 22.9 MB. Max. memory is 11.5 GB. [2019-10-22 11:25:00,149 INFO L168 Benchmark]: Boogie Procedure Inliner took 21.73 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. [2019-10-22 11:25:00,149 INFO L168 Benchmark]: Boogie Preprocessor took 14.61 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. [2019-10-22 11:25:00,149 INFO L168 Benchmark]: RCFGBuilder took 218.17 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: 17.0 MB). Peak memory consumption was 17.0 MB. Max. memory is 11.5 GB. [2019-10-22 11:25:00,150 INFO L168 Benchmark]: TraceAbstraction took 540.49 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: 33.6 MB). Peak memory consumption was 33.6 MB. Max. memory is 11.5 GB. [2019-10-22 11:25:00,152 INFO L168 Benchmark]: Witness Printer took 47.14 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. [2019-10-22 11:25:00,154 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.11 ms. Allocated memory is still 1.0 GB. Free memory is still 967.3 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 250.93 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 136.8 MB). Free memory was 944.5 MB in the beginning and 1.1 GB in the end (delta: -185.7 MB). Peak memory consumption was 22.9 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 21.73 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 14.61 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 218.17 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: 17.0 MB). Peak memory consumption was 17.0 MB. Max. memory is 11.5 GB. * TraceAbstraction took 540.49 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: 33.6 MB). Peak memory consumption was 33.6 MB. Max. memory is 11.5 GB. * Witness Printer took 47.14 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. 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 n<3 VAL [\old(n)=2, n=2] [L16] RET f(n) VAL [\old(n)=3, n=2] [L17] __VERIFIER_error() VAL [\old(n)=3, n=2] - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 19 locations, 2 error locations. Result: UNSAFE, OverallTime: 0.4s, OverallIterations: 2, TraceHistogramMax: 2, AutomataDifference: 0.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, HoareTripleCheckerStatistics: 11 SDtfs, 3 SDslu, 46 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=19occurred 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, 1 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.0s InterpolantComputationTime, 23 NumberOfCodeBlocks, 23 NumberOfCodeBlocksAsserted, 2 NumberOfCheckSat, 9 ConstructedInterpolants, 0 QuantifiedInterpolants, 189 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 1 InterpolantComputations, 1 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...