./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/id2_b3_o2_false-unreach-call_true-termination_true-no-overflow.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 635dfa2a Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_7ec4c31a-c187-46c4-8206-2e4671565461/bin-2019/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_7ec4c31a-c187-46c4-8206-2e4671565461/bin-2019/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_7ec4c31a-c187-46c4-8206-2e4671565461/bin-2019/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_7ec4c31a-c187-46c4-8206-2e4671565461/bin-2019/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/id2_b3_o2_false-unreach-call_true-termination_true-no-overflow.c -s /tmp/vcloud-vcloud-master/worker/working_dir_7ec4c31a-c187-46c4-8206-2e4671565461/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_7ec4c31a-c187-46c4-8206-2e4671565461/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 a033d09eab07f8bc6e49bb4301ebd6c89110f535 .............................................................................................................................................................................................................................................................................................................................................................................................................................................................. 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 0.1.23-635dfa2 [2018-12-09 17:41:12,447 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-09 17:41:12,448 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-09 17:41:12,454 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-12-09 17:41:12,455 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-12-09 17:41:12,455 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-12-09 17:41:12,456 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-12-09 17:41:12,457 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-12-09 17:41:12,457 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-12-09 17:41:12,458 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-12-09 17:41:12,458 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-12-09 17:41:12,458 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-12-09 17:41:12,459 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-12-09 17:41:12,459 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-12-09 17:41:12,460 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-12-09 17:41:12,460 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-12-09 17:41:12,461 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-12-09 17:41:12,462 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-12-09 17:41:12,463 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-12-09 17:41:12,463 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-12-09 17:41:12,464 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-12-09 17:41:12,464 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-12-09 17:41:12,466 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-12-09 17:41:12,466 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-12-09 17:41:12,466 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-12-09 17:41:12,466 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-12-09 17:41:12,467 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-12-09 17:41:12,467 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-12-09 17:41:12,468 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-12-09 17:41:12,468 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-12-09 17:41:12,468 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-12-09 17:41:12,469 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-12-09 17:41:12,469 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-12-09 17:41:12,469 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-12-09 17:41:12,470 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-12-09 17:41:12,470 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-12-09 17:41:12,470 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_7ec4c31a-c187-46c4-8206-2e4671565461/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-12-09 17:41:12,477 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-09 17:41:12,478 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-09 17:41:12,478 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-09 17:41:12,478 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-12-09 17:41:12,478 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-09 17:41:12,478 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-09 17:41:12,478 INFO L133 SettingsManager]: * Explicit value domain=true [2018-12-09 17:41:12,478 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-09 17:41:12,479 INFO L133 SettingsManager]: * Octagon Domain=false [2018-12-09 17:41:12,479 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-12-09 17:41:12,479 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-09 17:41:12,479 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-12-09 17:41:12,479 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-09 17:41:12,479 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-09 17:41:12,479 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-09 17:41:12,479 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-09 17:41:12,479 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-09 17:41:12,480 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-09 17:41:12,480 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-12-09 17:41:12,480 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-09 17:41:12,480 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-12-09 17:41:12,480 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-09 17:41:12,480 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-12-09 17:41:12,480 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-12-09 17:41:12,480 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-09 17:41:12,480 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-09 17:41:12,480 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-12-09 17:41:12,480 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-09 17:41:12,481 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-09 17:41:12,481 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-09 17:41:12,481 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-09 17:41:12,481 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-12-09 17:41:12,481 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-09 17:41:12,481 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-09 17:41:12,481 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-09 17:41:12,481 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-12-09 17:41:12,481 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_7ec4c31a-c187-46c4-8206-2e4671565461/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 -> a033d09eab07f8bc6e49bb4301ebd6c89110f535 [2018-12-09 17:41:12,500 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-09 17:41:12,507 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-09 17:41:12,509 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-09 17:41:12,510 INFO L271 PluginConnector]: Initializing CDTParser... [2018-12-09 17:41:12,510 INFO L276 PluginConnector]: CDTParser initialized [2018-12-09 17:41:12,511 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_7ec4c31a-c187-46c4-8206-2e4671565461/bin-2019/utaipan/../../sv-benchmarks/c/recursive-simple/id2_b3_o2_false-unreach-call_true-termination_true-no-overflow.c [2018-12-09 17:41:12,544 INFO L221 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_7ec4c31a-c187-46c4-8206-2e4671565461/bin-2019/utaipan/data/ae62c62d3/525293d443834c70930993f133d9008c/FLAGf7174bee3 [2018-12-09 17:41:12,950 INFO L307 CDTParser]: Found 1 translation units. [2018-12-09 17:41:12,950 INFO L161 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_7ec4c31a-c187-46c4-8206-2e4671565461/sv-benchmarks/c/recursive-simple/id2_b3_o2_false-unreach-call_true-termination_true-no-overflow.c [2018-12-09 17:41:12,954 INFO L355 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_7ec4c31a-c187-46c4-8206-2e4671565461/bin-2019/utaipan/data/ae62c62d3/525293d443834c70930993f133d9008c/FLAGf7174bee3 [2018-12-09 17:41:12,962 INFO L363 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_7ec4c31a-c187-46c4-8206-2e4671565461/bin-2019/utaipan/data/ae62c62d3/525293d443834c70930993f133d9008c [2018-12-09 17:41:12,964 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-09 17:41:12,965 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-12-09 17:41:12,966 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-12-09 17:41:12,966 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-12-09 17:41:12,968 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-12-09 17:41:12,968 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 05:41:12" (1/1) ... [2018-12-09 17:41:12,970 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@359bc049 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:41:12, skipping insertion in model container [2018-12-09 17:41:12,970 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 05:41:12" (1/1) ... [2018-12-09 17:41:12,974 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-12-09 17:41:12,983 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-12-09 17:41:13,068 INFO L203 PostProcessor]: Analyzing one entry point: main [2018-12-09 17:41:13,071 INFO L191 MainTranslator]: Completed pre-run [2018-12-09 17:41:13,080 INFO L203 PostProcessor]: Analyzing one entry point: main [2018-12-09 17:41:13,087 INFO L195 MainTranslator]: Completed translation [2018-12-09 17:41:13,088 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:41:13 WrapperNode [2018-12-09 17:41:13,088 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-12-09 17:41:13,088 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-09 17:41:13,088 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-09 17:41:13,088 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-09 17:41:13,093 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:41:13" (1/1) ... [2018-12-09 17:41:13,096 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:41:13" (1/1) ... [2018-12-09 17:41:13,099 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-09 17:41:13,100 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-09 17:41:13,100 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-09 17:41:13,100 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-09 17:41:13,105 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:41:13" (1/1) ... [2018-12-09 17:41:13,105 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:41:13" (1/1) ... [2018-12-09 17:41:13,105 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:41:13" (1/1) ... [2018-12-09 17:41:13,105 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:41:13" (1/1) ... [2018-12-09 17:41:13,107 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:41:13" (1/1) ... [2018-12-09 17:41:13,109 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:41:13" (1/1) ... [2018-12-09 17:41:13,109 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:41:13" (1/1) ... [2018-12-09 17:41:13,110 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-09 17:41:13,110 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-09 17:41:13,110 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-09 17:41:13,110 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-09 17:41:13,111 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:41:13" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_7ec4c31a-c187-46c4-8206-2e4671565461/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 [2018-12-09 17:41:13,172 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-12-09 17:41:13,172 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-12-09 17:41:13,172 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2018-12-09 17:41:13,172 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2018-12-09 17:41:13,172 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-12-09 17:41:13,172 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-12-09 17:41:13,172 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-12-09 17:41:13,172 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-12-09 17:41:13,172 INFO L130 BoogieDeclarations]: Found specification of procedure id [2018-12-09 17:41:13,173 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2018-12-09 17:41:13,254 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-12-09 17:41:13,255 INFO L280 CfgBuilder]: Removed 0 assue(true) statements. [2018-12-09 17:41:13,255 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 05:41:13 BoogieIcfgContainer [2018-12-09 17:41:13,255 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-09 17:41:13,256 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-09 17:41:13,256 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-09 17:41:13,257 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-09 17:41:13,258 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.12 05:41:12" (1/3) ... [2018-12-09 17:41:13,258 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@50c6ef3d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 05:41:13, skipping insertion in model container [2018-12-09 17:41:13,258 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:41:13" (2/3) ... [2018-12-09 17:41:13,258 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@50c6ef3d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 05:41:13, skipping insertion in model container [2018-12-09 17:41:13,258 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 05:41:13" (3/3) ... [2018-12-09 17:41:13,260 INFO L112 eAbstractionObserver]: Analyzing ICFG id2_b3_o2_false-unreach-call_true-termination_true-no-overflow.c [2018-12-09 17:41:13,265 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-09 17:41:13,269 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-12-09 17:41:13,278 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-12-09 17:41:13,296 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-09 17:41:13,296 INFO L383 AbstractCegarLoop]: Hoare is true [2018-12-09 17:41:13,296 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-09 17:41:13,296 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-09 17:41:13,296 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-09 17:41:13,296 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-09 17:41:13,297 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-09 17:41:13,297 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-09 17:41:13,306 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2018-12-09 17:41:13,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-12-09 17:41:13,310 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 17:41:13,310 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 17:41:13,311 INFO L423 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 17:41:13,314 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:41:13,315 INFO L82 PathProgramCache]: Analyzing trace with hash 128923731, now seen corresponding path program 1 times [2018-12-09 17:41:13,316 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 17:41:13,343 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:41:13,343 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 17:41:13,343 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:41:13,343 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 17:41:13,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:41:13,443 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 17:41:13,444 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-09 17:41:13,444 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-12-09 17:41:13,445 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-09 17:41:13,447 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-12-09 17:41:13,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-12-09 17:41:13,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-12-09 17:41:13,456 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 5 states. [2018-12-09 17:41:13,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 17:41:13,482 INFO L93 Difference]: Finished difference Result 40 states and 46 transitions. [2018-12-09 17:41:13,482 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-12-09 17:41:13,483 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2018-12-09 17:41:13,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 17:41:13,488 INFO L225 Difference]: With dead ends: 40 [2018-12-09 17:41:13,488 INFO L226 Difference]: Without dead ends: 26 [2018-12-09 17:41:13,490 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-12-09 17:41:13,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-12-09 17:41:13,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-12-09 17:41:13,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-12-09 17:41:13,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2018-12-09 17:41:13,515 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 13 [2018-12-09 17:41:13,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 17:41:13,516 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2018-12-09 17:41:13,516 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-12-09 17:41:13,516 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2018-12-09 17:41:13,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-12-09 17:41:13,517 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 17:41:13,517 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 17:41:13,517 INFO L423 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 17:41:13,518 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:41:13,518 INFO L82 PathProgramCache]: Analyzing trace with hash 1945633833, now seen corresponding path program 1 times [2018-12-09 17:41:13,518 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 17:41:13,518 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:41:13,519 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 17:41:13,519 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:41:13,519 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 17:41:13,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:41:13,571 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 17:41:13,571 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-09 17:41:13,571 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-12-09 17:41:13,571 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-09 17:41:13,573 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-12-09 17:41:13,573 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-12-09 17:41:13,573 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-12-09 17:41:13,573 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand 5 states. [2018-12-09 17:41:13,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 17:41:13,593 INFO L93 Difference]: Finished difference Result 44 states and 52 transitions. [2018-12-09 17:41:13,593 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-12-09 17:41:13,593 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2018-12-09 17:41:13,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 17:41:13,594 INFO L225 Difference]: With dead ends: 44 [2018-12-09 17:41:13,594 INFO L226 Difference]: Without dead ends: 32 [2018-12-09 17:41:13,595 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-12-09 17:41:13,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-12-09 17:41:13,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2018-12-09 17:41:13,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-12-09 17:41:13,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2018-12-09 17:41:13,601 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 20 [2018-12-09 17:41:13,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 17:41:13,601 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2018-12-09 17:41:13,601 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-12-09 17:41:13,601 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2018-12-09 17:41:13,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-12-09 17:41:13,602 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 17:41:13,602 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-09 17:41:13,602 INFO L423 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 17:41:13,602 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:41:13,602 INFO L82 PathProgramCache]: Analyzing trace with hash 1974262984, now seen corresponding path program 1 times [2018-12-09 17:41:13,603 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 17:41:13,603 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:41:13,603 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 17:41:13,603 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:41:13,603 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 17:41:13,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:41:13,684 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-09 17:41:13,684 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-09 17:41:13,685 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2018-12-09 17:41:13,685 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-09 17:41:13,685 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-12-09 17:41:13,685 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-12-09 17:41:13,685 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2018-12-09 17:41:13,686 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand 8 states. [2018-12-09 17:41:13,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 17:41:13,713 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2018-12-09 17:41:13,714 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-12-09 17:41:13,714 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2018-12-09 17:41:13,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 17:41:13,714 INFO L225 Difference]: With dead ends: 36 [2018-12-09 17:41:13,714 INFO L226 Difference]: Without dead ends: 32 [2018-12-09 17:41:13,715 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2018-12-09 17:41:13,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-12-09 17:41:13,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2018-12-09 17:41:13,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-12-09 17:41:13,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2018-12-09 17:41:13,718 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 20 [2018-12-09 17:41:13,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 17:41:13,718 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2018-12-09 17:41:13,718 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-12-09 17:41:13,718 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2018-12-09 17:41:13,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-12-09 17:41:13,718 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 17:41:13,718 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, 1, 1, 1, 1] [2018-12-09 17:41:13,719 INFO L423 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 17:41:13,719 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:41:13,719 INFO L82 PathProgramCache]: Analyzing trace with hash 1423155149, now seen corresponding path program 1 times [2018-12-09 17:41:13,719 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 17:41:13,719 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:41:13,719 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 17:41:13,719 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:41:13,719 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 17:41:13,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:41:13,756 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-12-09 17:41:13,756 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-09 17:41:13,756 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-12-09 17:41:13,756 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-09 17:41:13,757 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-12-09 17:41:13,757 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-12-09 17:41:13,757 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-12-09 17:41:13,757 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand 5 states. [2018-12-09 17:41:13,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 17:41:13,768 INFO L93 Difference]: Finished difference Result 48 states and 55 transitions. [2018-12-09 17:41:13,768 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-12-09 17:41:13,768 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 27 [2018-12-09 17:41:13,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 17:41:13,769 INFO L225 Difference]: With dead ends: 48 [2018-12-09 17:41:13,769 INFO L226 Difference]: Without dead ends: 36 [2018-12-09 17:41:13,769 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-12-09 17:41:13,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-12-09 17:41:13,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2018-12-09 17:41:13,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-12-09 17:41:13,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2018-12-09 17:41:13,772 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 27 [2018-12-09 17:41:13,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 17:41:13,773 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2018-12-09 17:41:13,773 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-12-09 17:41:13,773 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2018-12-09 17:41:13,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-12-09 17:41:13,773 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 17:41:13,773 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, 1, 1, 1, 1] [2018-12-09 17:41:13,773 INFO L423 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 17:41:13,774 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:41:13,774 INFO L82 PathProgramCache]: Analyzing trace with hash 1226641644, now seen corresponding path program 1 times [2018-12-09 17:41:13,774 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 17:41:13,774 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:41:13,774 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 17:41:13,774 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:41:13,774 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 17:41:13,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-09 17:41:13,817 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-12-09 17:41:13,818 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-09 17:41:13,818 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-12-09 17:41:13,818 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-09 17:41:13,818 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-12-09 17:41:13,818 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-12-09 17:41:13,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-12-09 17:41:13,818 INFO L87 Difference]: Start difference. First operand 34 states and 38 transitions. Second operand 5 states. [2018-12-09 17:41:13,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-09 17:41:13,827 INFO L93 Difference]: Finished difference Result 40 states and 44 transitions. [2018-12-09 17:41:13,827 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-12-09 17:41:13,828 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 27 [2018-12-09 17:41:13,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-09 17:41:13,828 INFO L225 Difference]: With dead ends: 40 [2018-12-09 17:41:13,828 INFO L226 Difference]: Without dead ends: 36 [2018-12-09 17:41:13,829 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-12-09 17:41:13,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-12-09 17:41:13,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2018-12-09 17:41:13,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-12-09 17:41:13,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2018-12-09 17:41:13,832 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 27 [2018-12-09 17:41:13,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-09 17:41:13,832 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2018-12-09 17:41:13,832 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-12-09 17:41:13,832 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2018-12-09 17:41:13,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-12-09 17:41:13,833 INFO L394 BasicCegarLoop]: Found error trace [2018-12-09 17:41:13,833 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, 1, 1, 1, 1] [2018-12-09 17:41:13,833 INFO L423 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-12-09 17:41:13,833 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-09 17:41:13,833 INFO L82 PathProgramCache]: Analyzing trace with hash 1255270795, now seen corresponding path program 1 times [2018-12-09 17:41:13,833 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-09 17:41:13,834 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:41:13,834 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-09 17:41:13,834 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-09 17:41:13,834 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-09 17:41:13,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-12-09 17:41:13,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-12-09 17:41:13,867 INFO L469 BasicCegarLoop]: Counterexample might be feasible [2018-12-09 17:41:13,882 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 09.12 05:41:13 BoogieIcfgContainer [2018-12-09 17:41:13,883 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-12-09 17:41:13,883 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-12-09 17:41:13,883 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-12-09 17:41:13,883 INFO L276 PluginConnector]: Witness Printer initialized [2018-12-09 17:41:13,883 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 05:41:13" (3/4) ... [2018-12-09 17:41:13,884 INFO L138 WitnessPrinter]: Generating witness for reachability counterexample [2018-12-09 17:41:13,910 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_7ec4c31a-c187-46c4-8206-2e4671565461/bin-2019/utaipan/witness.graphml [2018-12-09 17:41:13,910 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-12-09 17:41:13,910 INFO L168 Benchmark]: Toolchain (without parser) took 945.92 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 146.3 MB). Free memory was 958.8 MB in the beginning and 1.0 GB in the end (delta: -70.8 MB). Peak memory consumption was 75.5 MB. Max. memory is 11.5 GB. [2018-12-09 17:41:13,911 INFO L168 Benchmark]: CDTParser took 0.11 ms. Allocated memory is still 1.0 GB. Free memory is still 978.7 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-09 17:41:13,911 INFO L168 Benchmark]: CACSL2BoogieTranslator took 122.34 ms. Allocated memory is still 1.0 GB. Free memory was 958.8 MB in the beginning and 948.1 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2018-12-09 17:41:13,912 INFO L168 Benchmark]: Boogie Procedure Inliner took 11.19 ms. Allocated memory is still 1.0 GB. Free memory is still 948.1 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-09 17:41:13,912 INFO L168 Benchmark]: Boogie Preprocessor took 10.29 ms. Allocated memory is still 1.0 GB. Free memory is still 948.1 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-09 17:41:13,912 INFO L168 Benchmark]: RCFGBuilder took 145.01 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 146.3 MB). Free memory was 948.1 MB in the beginning and 1.1 GB in the end (delta: -179.2 MB). Peak memory consumption was 18.5 MB. Max. memory is 11.5 GB. [2018-12-09 17:41:13,912 INFO L168 Benchmark]: TraceAbstraction took 627.09 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.0 GB in the end (delta: 91.0 MB). Peak memory consumption was 91.0 MB. Max. memory is 11.5 GB. [2018-12-09 17:41:13,913 INFO L168 Benchmark]: Witness Printer took 27.15 ms. Allocated memory is still 1.2 GB. Free memory was 1.0 GB in the beginning and 1.0 GB in the end (delta: 6.6 MB). Peak memory consumption was 6.6 MB. Max. memory is 11.5 GB. [2018-12-09 17:41:13,915 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.11 ms. Allocated memory is still 1.0 GB. Free memory is still 978.7 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 122.34 ms. Allocated memory is still 1.0 GB. Free memory was 958.8 MB in the beginning and 948.1 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 11.19 ms. Allocated memory is still 1.0 GB. Free memory is still 948.1 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 10.29 ms. Allocated memory is still 1.0 GB. Free memory is still 948.1 MB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 145.01 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 146.3 MB). Free memory was 948.1 MB in the beginning and 1.1 GB in the end (delta: -179.2 MB). Peak memory consumption was 18.5 MB. Max. memory is 11.5 GB. * TraceAbstraction took 627.09 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.0 GB in the end (delta: 91.0 MB). Peak memory consumption was 91.0 MB. Max. memory is 11.5 GB. * Witness Printer took 27.15 ms. Allocated memory is still 1.2 GB. Free memory was 1.0 GB in the beginning and 1.0 GB in the end (delta: 6.6 MB). Peak memory consumption was 6.6 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 25]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L22] unsigned int input = __VERIFIER_nondet_uint(); [L23] CALL, EXPR id(input) VAL [\old(x)=2] [L8] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L9] CALL, EXPR id2(x-1) VAL [\old(x)=1] [L15] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L16] CALL, EXPR id(x-1) VAL [\old(x)=0] [L8] COND TRUE x==0 [L8] return 0; VAL [\old(x)=0, \result=0, x=0] [L16] RET, EXPR id(x-1) VAL [\old(x)=1, id(x-1)=0, x=1] [L16] unsigned int ret = id(x-1) + 1; [L17] COND FALSE !(ret > 3) [L18] return ret; VAL [\old(x)=1, \result=1, ret=1, x=1] [L9] RET, EXPR id2(x-1) VAL [\old(x)=2, id2(x-1)=1, x=2] [L9] unsigned int ret = id2(x-1) + 1; [L10] COND FALSE !(ret > 3) [L11] return ret; VAL [\old(x)=2, \result=2, ret=2, x=2] [L23] RET, EXPR id(input) VAL [id(input)=2, input=2] [L23] unsigned int result = id(input); [L24] COND TRUE result == 2 VAL [input=2, result=2] [L25] __VERIFIER_error() VAL [input=2, result=2] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 28 locations, 1 error locations. UNSAFE Result, 0.5s OverallTime, 6 OverallIterations, 2 TraceHistogramMax, 0.1s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 142 SDtfs, 8 SDslu, 479 SDs, 0 SdLazy, 67 SolverSat, 0 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 29 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=34occurred in iteration=4, 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, 5 MinimizatonAttempts, 8 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.2s InterpolantComputationTime, 134 NumberOfCodeBlocks, 134 NumberOfCodeBlocksAsserted, 6 NumberOfCheckSat, 102 ConstructedInterpolants, 0 QuantifiedInterpolants, 5478 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 5 InterpolantComputations, 5 PerfectInterpolantSequences, 8/8 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...