./Ultimate.py --spec ../../sv-benchmarks/c/ReachSafety.prp --file ../../sv-benchmarks/c/recursive-simple/id_i5_o5_false-unreach-call_true-termination.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 1dbac8bc Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_0c42bc9d-7447-48b1-9464-8c7d8a8a8cc4/bin-2019/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_0c42bc9d-7447-48b1-9464-8c7d8a8a8cc4/bin-2019/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_0c42bc9d-7447-48b1-9464-8c7d8a8a8cc4/bin-2019/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_0c42bc9d-7447-48b1-9464-8c7d8a8a8cc4/bin-2019/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/id_i5_o5_false-unreach-call_true-termination.c -s /tmp/vcloud-vcloud-master/worker/working_dir_0c42bc9d-7447-48b1-9464-8c7d8a8a8cc4/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_0c42bc9d-7447-48b1-9464-8c7d8a8a8cc4/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 bd8a40b9ab0ccbf5be4fcc211d81cb04996473fb ......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 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 0.1.23-1dbac8b [2018-10-26 21:03:56,685 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-10-26 21:03:56,686 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-10-26 21:03:56,697 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-10-26 21:03:56,698 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-10-26 21:03:56,699 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-10-26 21:03:56,700 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-10-26 21:03:56,702 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-10-26 21:03:56,704 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-10-26 21:03:56,705 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-10-26 21:03:56,706 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-10-26 21:03:56,706 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-10-26 21:03:56,708 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-10-26 21:03:56,709 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-10-26 21:03:56,710 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-10-26 21:03:56,711 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-10-26 21:03:56,712 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-10-26 21:03:56,716 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-10-26 21:03:56,717 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-10-26 21:03:56,719 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-10-26 21:03:56,720 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-10-26 21:03:56,722 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-10-26 21:03:56,724 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-10-26 21:03:56,725 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-10-26 21:03:56,725 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-10-26 21:03:56,726 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-10-26 21:03:56,727 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-10-26 21:03:56,728 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-10-26 21:03:56,729 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-10-26 21:03:56,730 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-10-26 21:03:56,730 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-10-26 21:03:56,732 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-10-26 21:03:56,732 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-10-26 21:03:56,732 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-10-26 21:03:56,733 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-10-26 21:03:56,734 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-10-26 21:03:56,734 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_0c42bc9d-7447-48b1-9464-8c7d8a8a8cc4/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-10-26 21:03:56,748 INFO L110 SettingsManager]: Loading preferences was successful [2018-10-26 21:03:56,748 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-10-26 21:03:56,749 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-10-26 21:03:56,749 INFO L133 SettingsManager]: * User list type=DISABLED [2018-10-26 21:03:56,749 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-10-26 21:03:56,750 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-10-26 21:03:56,750 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-10-26 21:03:56,750 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-10-26 21:03:56,750 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-10-26 21:03:56,750 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-10-26 21:03:56,750 INFO L133 SettingsManager]: * Interval Domain=false [2018-10-26 21:03:56,752 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-10-26 21:03:56,753 INFO L133 SettingsManager]: * sizeof long=4 [2018-10-26 21:03:56,753 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-10-26 21:03:56,753 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-10-26 21:03:56,753 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-10-26 21:03:56,753 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-10-26 21:03:56,753 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-10-26 21:03:56,754 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-10-26 21:03:56,754 INFO L133 SettingsManager]: * sizeof long double=12 [2018-10-26 21:03:56,754 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-10-26 21:03:56,754 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-10-26 21:03:56,754 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-10-26 21:03:56,754 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-10-26 21:03:56,755 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-10-26 21:03:56,755 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-10-26 21:03:56,755 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-10-26 21:03:56,755 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-10-26 21:03:56,755 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-10-26 21:03:56,755 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-10-26 21:03:56,756 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-10-26 21:03:56,756 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-10-26 21:03:56,756 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-10-26 21:03:56,756 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-10-26 21:03:56,759 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_0c42bc9d-7447-48b1-9464-8c7d8a8a8cc4/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 -> bd8a40b9ab0ccbf5be4fcc211d81cb04996473fb [2018-10-26 21:03:56,797 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-10-26 21:03:56,809 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-10-26 21:03:56,813 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-10-26 21:03:56,814 INFO L271 PluginConnector]: Initializing CDTParser... [2018-10-26 21:03:56,815 INFO L276 PluginConnector]: CDTParser initialized [2018-10-26 21:03:56,816 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_0c42bc9d-7447-48b1-9464-8c7d8a8a8cc4/bin-2019/utaipan/../../sv-benchmarks/c/recursive-simple/id_i5_o5_false-unreach-call_true-termination.c [2018-10-26 21:03:56,866 INFO L218 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_0c42bc9d-7447-48b1-9464-8c7d8a8a8cc4/bin-2019/utaipan/data/59da1b146/97d328ef1c52438abafc27f1fd4bba37/FLAG509084d18 [2018-10-26 21:03:57,268 INFO L298 CDTParser]: Found 1 translation units. [2018-10-26 21:03:57,269 INFO L158 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_0c42bc9d-7447-48b1-9464-8c7d8a8a8cc4/sv-benchmarks/c/recursive-simple/id_i5_o5_false-unreach-call_true-termination.c [2018-10-26 21:03:57,276 INFO L346 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_0c42bc9d-7447-48b1-9464-8c7d8a8a8cc4/bin-2019/utaipan/data/59da1b146/97d328ef1c52438abafc27f1fd4bba37/FLAG509084d18 [2018-10-26 21:03:57,288 INFO L354 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_0c42bc9d-7447-48b1-9464-8c7d8a8a8cc4/bin-2019/utaipan/data/59da1b146/97d328ef1c52438abafc27f1fd4bba37 [2018-10-26 21:03:57,291 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-10-26 21:03:57,293 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-10-26 21:03:57,294 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-10-26 21:03:57,294 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-10-26 21:03:57,302 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-10-26 21:03:57,303 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.10 09:03:57" (1/1) ... [2018-10-26 21:03:57,306 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@501b0c05 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 09:03:57, skipping insertion in model container [2018-10-26 21:03:57,307 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.10 09:03:57" (1/1) ... [2018-10-26 21:03:57,317 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-10-26 21:03:57,333 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-10-26 21:03:57,451 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-26 21:03:57,453 INFO L189 MainTranslator]: Completed pre-run [2018-10-26 21:03:57,464 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-10-26 21:03:57,473 INFO L193 MainTranslator]: Completed translation [2018-10-26 21:03:57,473 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 09:03:57 WrapperNode [2018-10-26 21:03:57,473 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-10-26 21:03:57,474 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-10-26 21:03:57,474 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-10-26 21:03:57,474 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-10-26 21:03:57,481 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 09:03:57" (1/1) ... [2018-10-26 21:03:57,487 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 09:03:57" (1/1) ... [2018-10-26 21:03:57,493 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-10-26 21:03:57,494 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-10-26 21:03:57,494 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-10-26 21:03:57,494 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-10-26 21:03:57,504 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 09:03:57" (1/1) ... [2018-10-26 21:03:57,504 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 09:03:57" (1/1) ... [2018-10-26 21:03:57,504 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 09:03:57" (1/1) ... [2018-10-26 21:03:57,505 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 09:03:57" (1/1) ... [2018-10-26 21:03:57,510 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 09:03:57" (1/1) ... [2018-10-26 21:03:57,513 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 09:03:57" (1/1) ... [2018-10-26 21:03:57,514 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 09:03:57" (1/1) ... [2018-10-26 21:03:57,515 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-10-26 21:03:57,516 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-10-26 21:03:57,517 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-10-26 21:03:57,517 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-10-26 21:03:57,519 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 09:03:57" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_0c42bc9d-7447-48b1-9464-8c7d8a8a8cc4/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 [2018-10-26 21:03:57,680 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-10-26 21:03:57,680 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-10-26 21:03:57,681 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-10-26 21:03:57,681 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-10-26 21:03:57,681 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-10-26 21:03:57,681 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-10-26 21:03:57,681 INFO L130 BoogieDeclarations]: Found specification of procedure id [2018-10-26 21:03:57,681 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2018-10-26 21:03:57,902 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-10-26 21:03:57,902 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.10 09:03:57 BoogieIcfgContainer [2018-10-26 21:03:57,902 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-10-26 21:03:57,903 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-10-26 21:03:57,903 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-10-26 21:03:57,905 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-10-26 21:03:57,906 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.10 09:03:57" (1/3) ... [2018-10-26 21:03:57,906 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d777261 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.10 09:03:57, skipping insertion in model container [2018-10-26 21:03:57,906 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.10 09:03:57" (2/3) ... [2018-10-26 21:03:57,907 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d777261 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.10 09:03:57, skipping insertion in model container [2018-10-26 21:03:57,909 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.10 09:03:57" (3/3) ... [2018-10-26 21:03:57,911 INFO L112 eAbstractionObserver]: Analyzing ICFG id_i5_o5_false-unreach-call_true-termination.c [2018-10-26 21:03:57,922 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-10-26 21:03:57,930 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-10-26 21:03:57,950 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-10-26 21:03:57,995 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-10-26 21:03:57,995 INFO L383 AbstractCegarLoop]: Hoare is true [2018-10-26 21:03:57,995 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-10-26 21:03:57,995 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-10-26 21:03:57,995 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-10-26 21:03:57,996 INFO L387 AbstractCegarLoop]: Difference is false [2018-10-26 21:03:57,996 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-10-26 21:03:57,996 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-10-26 21:03:58,018 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2018-10-26 21:03:58,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-10-26 21:03:58,031 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 21:03:58,032 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 21:03:58,034 INFO L424 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 21:03:58,039 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 21:03:58,043 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2018-10-26 21:03:58,046 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 21:03:58,099 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 21:03:58,100 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 21:03:58,100 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 21:03:58,101 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 21:03:58,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 21:03:58,406 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-10-26 21:03:58,410 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-10-26 21:03:58,410 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-10-26 21:03:58,410 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-10-26 21:03:58,414 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-10-26 21:03:58,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-10-26 21:03:58,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-10-26 21:03:58,426 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2018-10-26 21:03:58,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 21:03:58,560 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2018-10-26 21:03:58,562 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-10-26 21:03:58,563 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2018-10-26 21:03:58,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 21:03:58,574 INFO L225 Difference]: With dead ends: 30 [2018-10-26 21:03:58,575 INFO L226 Difference]: Without dead ends: 18 [2018-10-26 21:03:58,578 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-10-26 21:03:58,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-10-26 21:03:58,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-10-26 21:03:58,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-10-26 21:03:58,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-10-26 21:03:58,627 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2018-10-26 21:03:58,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 21:03:58,627 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-10-26 21:03:58,627 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-10-26 21:03:58,627 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-10-26 21:03:58,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-10-26 21:03:58,629 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 21:03:58,629 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 21:03:58,630 INFO L424 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 21:03:58,630 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 21:03:58,630 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2018-10-26 21:03:58,630 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 21:03:58,633 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 21:03:58,633 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 21:03:58,633 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 21:03:58,633 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 21:03:58,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 21:03:58,734 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-26 21:03:58,734 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 21:03:58,734 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 21:03:58,736 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 20 with the following transitions: [2018-10-26 21:03:58,739 INFO L202 CegarAbsIntRunner]: [0], [4], [6], [9], [11], [17], [20], [21], [23], [24], [25], [26], [27], [29], [30], [31], [32] [2018-10-26 21:03:58,784 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-10-26 21:03:58,784 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-10-26 21:03:58,956 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-10-26 21:03:58,958 INFO L272 AbstractInterpreter]: Visited 17 different actions 50 times. Never merged. Widened at 1 different actions 2 times. Found 1 fixpoints after 1 different actions. Largest state had 4 variables. [2018-10-26 21:03:58,968 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 21:03:58,969 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-10-26 21:03:58,969 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 21:03:58,969 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_0c42bc9d-7447-48b1-9464-8c7d8a8a8cc4/bin-2019/utaipan/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 21:03:58,976 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 21:03:58,976 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-26 21:03:58,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 21:03:58,996 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 21:03:59,026 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-10-26 21:03:59,026 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 21:03:59,314 WARN L179 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-26 21:03:59,631 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-10-26 21:03:59,656 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 21:03:59,657 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 9 [2018-10-26 21:03:59,657 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 21:03:59,658 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-10-26 21:03:59,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-10-26 21:03:59,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2018-10-26 21:03:59,658 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 6 states. [2018-10-26 21:03:59,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 21:03:59,757 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2018-10-26 21:03:59,757 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-10-26 21:03:59,757 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2018-10-26 21:03:59,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 21:03:59,758 INFO L225 Difference]: With dead ends: 25 [2018-10-26 21:03:59,758 INFO L226 Difference]: Without dead ends: 21 [2018-10-26 21:03:59,759 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 33 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2018-10-26 21:03:59,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-10-26 21:03:59,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-10-26 21:03:59,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-10-26 21:03:59,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-10-26 21:03:59,764 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2018-10-26 21:03:59,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 21:03:59,765 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-10-26 21:03:59,765 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-10-26 21:03:59,765 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-10-26 21:03:59,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-10-26 21:03:59,766 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 21:03:59,766 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 21:03:59,766 INFO L424 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 21:03:59,766 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 21:03:59,766 INFO L82 PathProgramCache]: Analyzing trace with hash 397359997, now seen corresponding path program 2 times [2018-10-26 21:03:59,767 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 21:03:59,767 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 21:03:59,768 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 21:03:59,768 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 21:03:59,768 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 21:03:59,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 21:03:59,862 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-26 21:03:59,862 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 21:03:59,863 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 21:03:59,863 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 21:03:59,863 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 21:03:59,863 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 21:03:59,864 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_0c42bc9d-7447-48b1-9464-8c7d8a8a8cc4/bin-2019/utaipan/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 21:03:59,881 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-10-26 21:03:59,881 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-10-26 21:03:59,896 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-10-26 21:03:59,896 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 21:03:59,898 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 21:03:59,916 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-10-26 21:03:59,916 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 21:04:00,104 WARN L179 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-26 21:04:00,259 WARN L179 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2018-10-26 21:04:00,652 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-10-26 21:04:00,681 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 21:04:00,681 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 9] total 11 [2018-10-26 21:04:00,681 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 21:04:00,682 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-10-26 21:04:00,682 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-10-26 21:04:00,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2018-10-26 21:04:00,683 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 7 states. [2018-10-26 21:04:00,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 21:04:00,786 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2018-10-26 21:04:00,788 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-10-26 21:04:00,789 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2018-10-26 21:04:00,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 21:04:00,790 INFO L225 Difference]: With dead ends: 28 [2018-10-26 21:04:00,790 INFO L226 Difference]: Without dead ends: 24 [2018-10-26 21:04:00,791 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 43 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2018-10-26 21:04:00,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-10-26 21:04:00,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-10-26 21:04:00,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-10-26 21:04:00,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2018-10-26 21:04:00,797 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2018-10-26 21:04:00,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 21:04:00,797 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2018-10-26 21:04:00,797 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-10-26 21:04:00,798 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2018-10-26 21:04:00,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-10-26 21:04:00,798 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 21:04:00,799 INFO L375 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 21:04:00,799 INFO L424 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 21:04:00,800 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 21:04:00,801 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 3 times [2018-10-26 21:04:00,801 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 21:04:00,801 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 21:04:00,801 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 21:04:00,802 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 21:04:00,802 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 21:04:00,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 21:04:00,988 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-26 21:04:00,989 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 21:04:00,989 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 21:04:00,989 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 21:04:00,989 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 21:04:00,990 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 21:04:00,990 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_0c42bc9d-7447-48b1-9464-8c7d8a8a8cc4/bin-2019/utaipan/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 21:04:01,002 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-10-26 21:04:01,002 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-10-26 21:04:01,013 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-10-26 21:04:01,013 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-10-26 21:04:01,015 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 21:04:01,131 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-10-26 21:04:01,131 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 21:04:01,673 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-10-26 21:04:01,693 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 21:04:01,693 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8, 11] total 22 [2018-10-26 21:04:01,694 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 21:04:01,694 INFO L460 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-10-26 21:04:01,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-10-26 21:04:01,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=391, Unknown=0, NotChecked=0, Total=462 [2018-10-26 21:04:01,695 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 17 states. [2018-10-26 21:04:01,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 21:04:01,830 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2018-10-26 21:04:01,831 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-10-26 21:04:01,831 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 31 [2018-10-26 21:04:01,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 21:04:01,832 INFO L225 Difference]: With dead ends: 31 [2018-10-26 21:04:01,832 INFO L226 Difference]: Without dead ends: 27 [2018-10-26 21:04:01,832 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 44 SyntacticMatches, 8 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 150 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=161, Invalid=651, Unknown=0, NotChecked=0, Total=812 [2018-10-26 21:04:01,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-10-26 21:04:01,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-10-26 21:04:01,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-10-26 21:04:01,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2018-10-26 21:04:01,838 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2018-10-26 21:04:01,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 21:04:01,840 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2018-10-26 21:04:01,840 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-10-26 21:04:01,840 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2018-10-26 21:04:01,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-10-26 21:04:01,841 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 21:04:01,841 INFO L375 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 21:04:01,841 INFO L424 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 21:04:01,841 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 21:04:01,842 INFO L82 PathProgramCache]: Analyzing trace with hash 1080764669, now seen corresponding path program 4 times [2018-10-26 21:04:01,842 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 21:04:01,842 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 21:04:01,842 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-10-26 21:04:01,842 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 21:04:01,843 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 21:04:01,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 21:04:01,935 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-26 21:04:01,935 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 21:04:01,935 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-10-26 21:04:01,935 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-10-26 21:04:01,935 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-10-26 21:04:01,935 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-10-26 21:04:01,936 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_0c42bc9d-7447-48b1-9464-8c7d8a8a8cc4/bin-2019/utaipan/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-10-26 21:04:01,959 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 21:04:01,959 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-10-26 21:04:01,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-10-26 21:04:01,974 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-10-26 21:04:01,984 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-10-26 21:04:01,985 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-10-26 21:04:02,100 WARN L179 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-10-26 21:04:02,841 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-10-26 21:04:02,861 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-10-26 21:04:02,861 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 13] total 14 [2018-10-26 21:04:02,861 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-10-26 21:04:02,862 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-10-26 21:04:02,862 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-10-26 21:04:02,862 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2018-10-26 21:04:02,862 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 9 states. [2018-10-26 21:04:02,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-10-26 21:04:02,920 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2018-10-26 21:04:02,927 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-10-26 21:04:02,927 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 37 [2018-10-26 21:04:02,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-10-26 21:04:02,928 INFO L225 Difference]: With dead ends: 34 [2018-10-26 21:04:02,928 INFO L226 Difference]: Without dead ends: 30 [2018-10-26 21:04:02,929 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 63 SyntacticMatches, 11 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2018-10-26 21:04:02,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-10-26 21:04:02,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-10-26 21:04:02,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-10-26 21:04:02,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2018-10-26 21:04:02,933 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2018-10-26 21:04:02,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-10-26 21:04:02,933 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2018-10-26 21:04:02,933 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-10-26 21:04:02,933 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2018-10-26 21:04:02,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-10-26 21:04:02,934 INFO L367 BasicCegarLoop]: Found error trace [2018-10-26 21:04:02,934 INFO L375 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-10-26 21:04:02,934 INFO L424 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-10-26 21:04:02,935 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-10-26 21:04:02,935 INFO L82 PathProgramCache]: Analyzing trace with hash -1752970513, now seen corresponding path program 5 times [2018-10-26 21:04:02,935 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-10-26 21:04:02,936 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 21:04:02,937 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-10-26 21:04:02,937 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-10-26 21:04:02,937 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-10-26 21:04:02,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-10-26 21:04:02,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-10-26 21:04:02,975 INFO L442 BasicCegarLoop]: Counterexample might be feasible [2018-10-26 21:04:03,004 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 26.10 09:04:03 BoogieIcfgContainer [2018-10-26 21:04:03,004 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-10-26 21:04:03,005 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-10-26 21:04:03,005 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-10-26 21:04:03,005 INFO L276 PluginConnector]: Witness Printer initialized [2018-10-26 21:04:03,005 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.10 09:03:57" (3/4) ... [2018-10-26 21:04:03,009 INFO L138 WitnessPrinter]: Generating witness for reachability counterexample [2018-10-26 21:04:03,062 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_0c42bc9d-7447-48b1-9464-8c7d8a8a8cc4/bin-2019/utaipan/witness.graphml [2018-10-26 21:04:03,066 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-10-26 21:04:03,067 INFO L168 Benchmark]: Toolchain (without parser) took 5774.84 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 151.5 MB). Free memory was 954.4 MB in the beginning and 949.3 MB in the end (delta: 5.1 MB). Peak memory consumption was 156.6 MB. Max. memory is 11.5 GB. [2018-10-26 21:04:03,068 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 1.0 GB. Free memory is still 980.0 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-26 21:04:03,068 INFO L168 Benchmark]: CACSL2BoogieTranslator took 179.83 ms. Allocated memory is still 1.0 GB. Free memory was 954.4 MB in the beginning and 943.7 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2018-10-26 21:04:03,069 INFO L168 Benchmark]: Boogie Procedure Inliner took 19.49 ms. Allocated memory is still 1.0 GB. Free memory is still 943.7 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-26 21:04:03,069 INFO L168 Benchmark]: Boogie Preprocessor took 21.77 ms. Allocated memory is still 1.0 GB. Free memory is still 943.7 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-10-26 21:04:03,069 INFO L168 Benchmark]: RCFGBuilder took 386.58 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 151.5 MB). Free memory was 943.7 MB in the beginning and 1.1 GB in the end (delta: -196.6 MB). Peak memory consumption was 23.7 MB. Max. memory is 11.5 GB. [2018-10-26 21:04:03,070 INFO L168 Benchmark]: TraceAbstraction took 5101.56 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 952.7 MB in the end (delta: 187.6 MB). Peak memory consumption was 187.6 MB. Max. memory is 11.5 GB. [2018-10-26 21:04:03,070 INFO L168 Benchmark]: Witness Printer took 61.16 ms. Allocated memory is still 1.2 GB. Free memory was 952.7 MB in the beginning and 949.3 MB in the end (delta: 3.4 MB). Peak memory consumption was 3.4 MB. Max. memory is 11.5 GB. [2018-10-26 21:04:03,081 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 1.0 GB. Free memory is still 980.0 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 179.83 ms. Allocated memory is still 1.0 GB. Free memory was 954.4 MB in the beginning and 943.7 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 19.49 ms. Allocated memory is still 1.0 GB. Free memory is still 943.7 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 21.77 ms. Allocated memory is still 1.0 GB. Free memory is still 943.7 MB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 386.58 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 151.5 MB). Free memory was 943.7 MB in the beginning and 1.1 GB in the end (delta: -196.6 MB). Peak memory consumption was 23.7 MB. Max. memory is 11.5 GB. * TraceAbstraction took 5101.56 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 952.7 MB in the end (delta: 187.6 MB). Peak memory consumption was 187.6 MB. Max. memory is 11.5 GB. * Witness Printer took 61.16 ms. Allocated memory is still 1.2 GB. Free memory was 952.7 MB in the beginning and 949.3 MB 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: 13]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L10] int input = 5; VAL [input=5] [L11] CALL, EXPR id(input) VAL [\old(x)=5] [L5] COND FALSE !(x==0) VAL [\old(x)=5, x=5] [L6] CALL, EXPR id(x-1) VAL [\old(x)=4] [L5] COND FALSE !(x==0) VAL [\old(x)=4, x=4] [L6] CALL, EXPR id(x-1) VAL [\old(x)=3] [L5] COND FALSE !(x==0) VAL [\old(x)=3, x=3] [L6] CALL, EXPR id(x-1) VAL [\old(x)=2] [L5] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L6] CALL, EXPR id(x-1) VAL [\old(x)=1] [L5] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L6] CALL, EXPR id(x-1) VAL [\old(x)=0] [L5] COND TRUE x==0 [L5] RET return 0; VAL [\old(x)=0, \result=0, x=0] [L6] EXPR id(x-1) VAL [\old(x)=1, id(x-1)=0, x=1] [L6] RET return id(x-1) + 1; [L6] EXPR id(x-1) VAL [\old(x)=2, id(x-1)=1, x=2] [L6] RET return id(x-1) + 1; [L6] EXPR id(x-1) VAL [\old(x)=3, id(x-1)=2, x=3] [L6] RET return id(x-1) + 1; [L6] EXPR id(x-1) VAL [\old(x)=4, id(x-1)=3, x=4] [L6] RET return id(x-1) + 1; [L6] EXPR id(x-1) VAL [\old(x)=5, id(x-1)=4, x=5] [L6] RET return id(x-1) + 1; [L11] EXPR id(input) VAL [id(input)=5, input=5] [L11] int result = id(input); [L12] COND TRUE result == 5 VAL [input=5, result=5] [L13] __VERIFIER_error() VAL [input=5, result=5] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. UNSAFE Result, 5.0s OverallTime, 6 OverallIterations, 6 TraceHistogramMax, 0.5s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 68 SDtfs, 55 SDslu, 282 SDs, 0 SdLazy, 180 SolverSat, 9 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 283 GetRequests, 185 SyntacticMatches, 29 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 240 ImplicationChecksByTransitivity, 1.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=30occurred in iteration=5, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.2s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 5 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 3.5s InterpolantComputationTime, 280 NumberOfCodeBlocks, 276 NumberOfCodeBlocksAsserted, 12 NumberOfCheckSat, 336 ConstructedInterpolants, 0 QuantifiedInterpolants, 23592 SizeOfPredicates, 18 NumberOfNonLiveVariables, 252 ConjunctsInSsa, 36 ConjunctsInUnsatCore, 13 InterpolantComputations, 1 PerfectInterpolantSequences, 120/300 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...