./Ultimate.py --spec ../../sv-benchmarks/c/ReachSafety.prp --file ../../sv-benchmarks/c/recursive-simple/sum_2x3_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_e6d3ef8f-04c4-4b7c-bdbd-e18af1ab9bae/bin-2019/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_e6d3ef8f-04c4-4b7c-bdbd-e18af1ab9bae/bin-2019/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_e6d3ef8f-04c4-4b7c-bdbd-e18af1ab9bae/bin-2019/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_e6d3ef8f-04c4-4b7c-bdbd-e18af1ab9bae/bin-2019/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/sum_2x3_false-unreach-call_true-termination.c -s /tmp/vcloud-vcloud-master/worker/working_dir_e6d3ef8f-04c4-4b7c-bdbd-e18af1ab9bae/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_e6d3ef8f-04c4-4b7c-bdbd-e18af1ab9bae/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 5417ea5971c5cfa3624e07fbe8bf33ef4632cb6f .............................................................................................................................................................................................................................................................................................................................................................. 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 [2018-11-10 12:00:19,044 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-10 12:00:19,046 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-10 12:00:19,054 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-10 12:00:19,054 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-10 12:00:19,055 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-10 12:00:19,056 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-10 12:00:19,057 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-10 12:00:19,059 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-10 12:00:19,059 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-10 12:00:19,060 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-10 12:00:19,060 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-10 12:00:19,061 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-10 12:00:19,062 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-10 12:00:19,062 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-10 12:00:19,063 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-10 12:00:19,064 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-10 12:00:19,065 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-10 12:00:19,067 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-10 12:00:19,068 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-10 12:00:19,069 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-10 12:00:19,069 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-10 12:00:19,071 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-10 12:00:19,071 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-10 12:00:19,072 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-10 12:00:19,072 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-10 12:00:19,073 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-10 12:00:19,074 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-10 12:00:19,074 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-10 12:00:19,075 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-10 12:00:19,075 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-10 12:00:19,076 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-11-10 12:00:19,076 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-11-10 12:00:19,076 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-11-10 12:00:19,077 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-11-10 12:00:19,077 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-11-10 12:00:19,077 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_e6d3ef8f-04c4-4b7c-bdbd-e18af1ab9bae/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2018-11-10 12:00:19,088 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-10 12:00:19,088 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-10 12:00:19,089 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-10 12:00:19,089 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-10 12:00:19,089 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-11-10 12:00:19,089 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-10 12:00:19,089 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-10 12:00:19,089 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-10 12:00:19,089 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-10 12:00:19,090 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-10 12:00:19,090 INFO L133 SettingsManager]: * Interval Domain=false [2018-11-10 12:00:19,090 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-10 12:00:19,090 INFO L133 SettingsManager]: * sizeof long=4 [2018-11-10 12:00:19,090 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-10 12:00:19,091 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-11-10 12:00:19,091 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-10 12:00:19,091 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-10 12:00:19,091 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-10 12:00:19,091 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-10 12:00:19,091 INFO L133 SettingsManager]: * sizeof long double=12 [2018-11-10 12:00:19,091 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-10 12:00:19,092 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-10 12:00:19,092 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-10 12:00:19,092 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-10 12:00:19,092 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-10 12:00:19,092 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-10 12:00:19,092 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-10 12:00:19,092 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-10 12:00:19,092 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-10 12:00:19,093 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-10 12:00:19,093 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-10 12:00:19,093 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-10 12:00:19,093 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-10 12:00:19,093 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-10 12:00:19,093 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_e6d3ef8f-04c4-4b7c-bdbd-e18af1ab9bae/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 -> 5417ea5971c5cfa3624e07fbe8bf33ef4632cb6f [2018-11-10 12:00:19,117 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-10 12:00:19,126 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-10 12:00:19,128 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-10 12:00:19,129 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-10 12:00:19,129 INFO L276 PluginConnector]: CDTParser initialized [2018-11-10 12:00:19,130 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_e6d3ef8f-04c4-4b7c-bdbd-e18af1ab9bae/bin-2019/utaipan/../../sv-benchmarks/c/recursive-simple/sum_2x3_false-unreach-call_true-termination.c [2018-11-10 12:00:19,173 INFO L218 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_e6d3ef8f-04c4-4b7c-bdbd-e18af1ab9bae/bin-2019/utaipan/data/b4c95d961/68c373ceb49445309b0b52e7bb4f9708/FLAGd8cc8f45e [2018-11-10 12:00:19,494 INFO L298 CDTParser]: Found 1 translation units. [2018-11-10 12:00:19,495 INFO L158 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_e6d3ef8f-04c4-4b7c-bdbd-e18af1ab9bae/sv-benchmarks/c/recursive-simple/sum_2x3_false-unreach-call_true-termination.c [2018-11-10 12:00:19,498 INFO L346 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_e6d3ef8f-04c4-4b7c-bdbd-e18af1ab9bae/bin-2019/utaipan/data/b4c95d961/68c373ceb49445309b0b52e7bb4f9708/FLAGd8cc8f45e [2018-11-10 12:00:19,508 INFO L354 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_e6d3ef8f-04c4-4b7c-bdbd-e18af1ab9bae/bin-2019/utaipan/data/b4c95d961/68c373ceb49445309b0b52e7bb4f9708 [2018-11-10 12:00:19,510 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-10 12:00:19,512 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-11-10 12:00:19,513 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-10 12:00:19,513 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-10 12:00:19,516 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-10 12:00:19,517 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 10.11 12:00:19" (1/1) ... [2018-11-10 12:00:19,519 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4bb581ed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 12:00:19, skipping insertion in model container [2018-11-10 12:00:19,519 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 10.11 12:00:19" (1/1) ... [2018-11-10 12:00:19,526 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-10 12:00:19,536 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-11-10 12:00:19,649 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-10 12:00:19,651 INFO L189 MainTranslator]: Completed pre-run [2018-11-10 12:00:19,661 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-10 12:00:19,669 INFO L193 MainTranslator]: Completed translation [2018-11-10 12:00:19,670 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 12:00:19 WrapperNode [2018-11-10 12:00:19,670 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-10 12:00:19,670 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-10 12:00:19,670 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-10 12:00:19,670 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-10 12:00:19,678 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 12:00:19" (1/1) ... [2018-11-10 12:00:19,682 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 12:00:19" (1/1) ... [2018-11-10 12:00:19,687 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-10 12:00:19,687 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-10 12:00:19,687 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-10 12:00:19,687 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-10 12:00:19,695 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 12:00:19" (1/1) ... [2018-11-10 12:00:19,695 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 12:00:19" (1/1) ... [2018-11-10 12:00:19,695 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 12:00:19" (1/1) ... [2018-11-10 12:00:19,696 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 12:00:19" (1/1) ... [2018-11-10 12:00:19,698 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 12:00:19" (1/1) ... [2018-11-10 12:00:19,699 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 12:00:19" (1/1) ... [2018-11-10 12:00:19,699 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 12:00:19" (1/1) ... [2018-11-10 12:00:19,700 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-10 12:00:19,700 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-10 12:00:19,701 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-10 12:00:19,701 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-10 12:00:19,701 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 12:00:19" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_e6d3ef8f-04c4-4b7c-bdbd-e18af1ab9bae/bin-2019/utaipan/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-10 12:00:19,784 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-10 12:00:19,785 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-10 12:00:19,785 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-10 12:00:19,785 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-10 12:00:19,785 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-10 12:00:19,785 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-10 12:00:19,785 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2018-11-10 12:00:19,786 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2018-11-10 12:00:19,895 INFO L341 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-10 12:00:19,896 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 10.11 12:00:19 BoogieIcfgContainer [2018-11-10 12:00:19,896 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-10 12:00:19,897 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-10 12:00:19,897 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-10 12:00:19,900 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-10 12:00:19,901 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 10.11 12:00:19" (1/3) ... [2018-11-10 12:00:19,901 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d5cee16 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 10.11 12:00:19, skipping insertion in model container [2018-11-10 12:00:19,901 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.11 12:00:19" (2/3) ... [2018-11-10 12:00:19,902 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d5cee16 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 10.11 12:00:19, skipping insertion in model container [2018-11-10 12:00:19,902 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 10.11 12:00:19" (3/3) ... [2018-11-10 12:00:19,904 INFO L112 eAbstractionObserver]: Analyzing ICFG sum_2x3_false-unreach-call_true-termination.c [2018-11-10 12:00:19,912 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-10 12:00:19,919 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-10 12:00:19,934 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-10 12:00:19,962 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-10 12:00:19,962 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-10 12:00:19,962 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-10 12:00:19,962 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-10 12:00:19,962 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-10 12:00:19,962 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-10 12:00:19,962 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-10 12:00:19,963 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-10 12:00:19,981 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2018-11-10 12:00:19,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-11-10 12:00:19,986 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 12:00:19,987 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 12:00:19,989 INFO L424 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 12:00:19,994 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 12:00:19,994 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2018-11-10 12:00:19,996 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-10 12:00:20,039 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 12:00:20,040 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-10 12:00:20,040 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 12:00:20,040 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-10 12:00:20,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 12:00:20,135 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-10 12:00:20,137 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-10 12:00:20,137 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-11-10 12:00:20,137 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-10 12:00:20,140 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-10 12:00:20,150 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-10 12:00:20,151 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-11-10 12:00:20,153 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2018-11-10 12:00:20,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 12:00:20,219 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2018-11-10 12:00:20,219 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-10 12:00:20,220 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2018-11-10 12:00:20,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 12:00:20,227 INFO L225 Difference]: With dead ends: 30 [2018-11-10 12:00:20,227 INFO L226 Difference]: Without dead ends: 18 [2018-11-10 12:00:20,229 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-11-10 12:00:20,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-11-10 12:00:20,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-11-10 12:00:20,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-11-10 12:00:20,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2018-11-10 12:00:20,258 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2018-11-10 12:00:20,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 12:00:20,258 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2018-11-10 12:00:20,258 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-10 12:00:20,258 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2018-11-10 12:00:20,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-11-10 12:00:20,260 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 12:00:20,260 INFO L375 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 12:00:20,260 INFO L424 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 12:00:20,260 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 12:00:20,260 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2018-11-10 12:00:20,261 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-10 12:00:20,261 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 12:00:20,261 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-10 12:00:20,262 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 12:00:20,262 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-10 12:00:20,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 12:00:20,321 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-10 12:00:20,322 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 12:00:20,322 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-10 12:00:20,323 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 20 with the following transitions: [2018-11-10 12:00:20,324 INFO L202 CegarAbsIntRunner]: [0], [4], [6], [9], [11], [17], [20], [21], [23], [24], [25], [26], [27], [29], [30], [31], [32] [2018-11-10 12:00:20,361 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-11-10 12:00:20,362 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-10 12:00:20,478 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-10 12:00:20,479 INFO L272 AbstractInterpreter]: Visited 17 different actions 28 times. Never merged. Never widened. Never found a fixpoint. Largest state had 6 variables. [2018-11-10 12:00:20,486 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 12:00:20,487 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-10 12:00:20,488 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-10 12:00:20,488 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_e6d3ef8f-04c4-4b7c-bdbd-e18af1ab9bae/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 [2018-11-10 12:00:20,502 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-10 12:00:20,503 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-10 12:00:20,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-10 12:00:20,524 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-10 12:00:20,550 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-10 12:00:20,550 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-10 12:00:20,689 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-11-10 12:00:20,707 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-10 12:00:20,707 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 8 [2018-11-10 12:00:20,708 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-10 12:00:20,708 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-10 12:00:20,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-10 12:00:20,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2018-11-10 12:00:20,709 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 6 states. [2018-11-10 12:00:20,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-10 12:00:20,749 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2018-11-10 12:00:20,749 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-10 12:00:20,749 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2018-11-10 12:00:20,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-10 12:00:20,750 INFO L225 Difference]: With dead ends: 25 [2018-11-10 12:00:20,750 INFO L226 Difference]: Without dead ends: 21 [2018-11-10 12:00:20,751 INFO L605 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 33 SyntacticMatches, 5 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-11-10 12:00:20,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-11-10 12:00:20,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-11-10 12:00:20,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-11-10 12:00:20,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-11-10 12:00:20,756 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2018-11-10 12:00:20,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-10 12:00:20,757 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-11-10 12:00:20,757 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-10 12:00:20,757 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-11-10 12:00:20,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-11-10 12:00:20,758 INFO L367 BasicCegarLoop]: Found error trace [2018-11-10 12:00:20,758 INFO L375 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-10 12:00:20,759 INFO L424 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-10 12:00:20,759 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-10 12:00:20,759 INFO L82 PathProgramCache]: Analyzing trace with hash 397359997, now seen corresponding path program 2 times [2018-11-10 12:00:20,759 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-10 12:00:20,760 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 12:00:20,760 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-10 12:00:20,760 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-10 12:00:20,760 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-10 12:00:20,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-11-10 12:00:20,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-11-10 12:00:20,800 INFO L442 BasicCegarLoop]: Counterexample might be feasible [2018-11-10 12:00:20,820 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 10.11 12:00:20 BoogieIcfgContainer [2018-11-10 12:00:20,820 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-11-10 12:00:20,820 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-11-10 12:00:20,820 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-11-10 12:00:20,821 INFO L276 PluginConnector]: Witness Printer initialized [2018-11-10 12:00:20,821 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 10.11 12:00:19" (3/4) ... [2018-11-10 12:00:20,823 INFO L138 WitnessPrinter]: Generating witness for reachability counterexample [2018-11-10 12:00:20,855 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_e6d3ef8f-04c4-4b7c-bdbd-e18af1ab9bae/bin-2019/utaipan/witness.graphml [2018-11-10 12:00:20,855 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-11-10 12:00:20,856 INFO L168 Benchmark]: Toolchain (without parser) took 1344.96 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 156.2 MB). Free memory was 960.2 MB in the beginning and 1.0 GB in the end (delta: -85.0 MB). Peak memory consumption was 71.3 MB. Max. memory is 11.5 GB. [2018-11-10 12:00:20,857 INFO L168 Benchmark]: CDTParser took 0.18 ms. Allocated memory is still 1.0 GB. Free memory is still 985.5 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-10 12:00:20,857 INFO L168 Benchmark]: CACSL2BoogieTranslator took 157.43 ms. Allocated memory is still 1.0 GB. Free memory was 960.2 MB in the beginning and 948.4 MB in the end (delta: 11.8 MB). Peak memory consumption was 11.8 MB. Max. memory is 11.5 GB. [2018-11-10 12:00:20,858 INFO L168 Benchmark]: Boogie Procedure Inliner took 16.60 ms. Allocated memory is still 1.0 GB. Free memory is still 948.4 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-10 12:00:20,858 INFO L168 Benchmark]: Boogie Preprocessor took 13.34 ms. Allocated memory is still 1.0 GB. Free memory is still 948.4 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-11-10 12:00:20,858 INFO L168 Benchmark]: RCFGBuilder took 195.43 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 156.2 MB). Free memory was 948.4 MB in the beginning and 1.1 GB in the end (delta: -197.3 MB). Peak memory consumption was 22.6 MB. Max. memory is 11.5 GB. [2018-11-10 12:00:20,859 INFO L168 Benchmark]: TraceAbstraction took 923.60 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: 93.8 MB). Peak memory consumption was 93.8 MB. Max. memory is 11.5 GB. [2018-11-10 12:00:20,859 INFO L168 Benchmark]: Witness Printer took 34.87 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: 3.4 MB). Peak memory consumption was 3.4 MB. Max. memory is 11.5 GB. [2018-11-10 12:00:20,862 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18 ms. Allocated memory is still 1.0 GB. Free memory is still 985.5 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 157.43 ms. Allocated memory is still 1.0 GB. Free memory was 960.2 MB in the beginning and 948.4 MB in the end (delta: 11.8 MB). Peak memory consumption was 11.8 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 16.60 ms. Allocated memory is still 1.0 GB. Free memory is still 948.4 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 13.34 ms. Allocated memory is still 1.0 GB. Free memory is still 948.4 MB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 195.43 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 156.2 MB). Free memory was 948.4 MB in the beginning and 1.1 GB in the end (delta: -197.3 MB). Peak memory consumption was 22.6 MB. Max. memory is 11.5 GB. * TraceAbstraction took 923.60 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: 93.8 MB). Peak memory consumption was 93.8 MB. Max. memory is 11.5 GB. * Witness Printer took 34.87 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: 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: 16]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L12] int a = 2; [L13] int b = 3; VAL [a=2, b=3] [L14] CALL, EXPR sum(a, b) VAL [\old(m)=3, \old(n)=2] [L4] COND FALSE !(n <= 0) VAL [\old(m)=3, \old(n)=2, m=3, n=2] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=4, \old(n)=1] [L4] COND FALSE !(n <= 0) VAL [\old(m)=4, \old(n)=1, m=4, n=1] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=5, \old(n)=0] [L4] COND TRUE n <= 0 [L5] RET return m + n; VAL [\old(m)=5, \old(n)=0, \result=5, m=5, n=0] [L7] EXPR sum(n - 1, m + 1) VAL [\old(m)=4, \old(n)=1, m=4, n=1, sum(n - 1, m + 1)=5] [L7] RET return sum(n - 1, m + 1); [L7] EXPR sum(n - 1, m + 1) VAL [\old(m)=3, \old(n)=2, m=3, n=2, sum(n - 1, m + 1)=5] [L7] RET return sum(n - 1, m + 1); [L14] EXPR sum(a, b) VAL [a=2, b=3, sum(a, b)=5] [L14] int result = sum(a, b); [L15] COND TRUE result == a + b VAL [a=2, b=3, result=5] [L16] __VERIFIER_error() VAL [a=2, b=3, result=5] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. UNSAFE Result, 0.8s OverallTime, 3 OverallIterations, 3 TraceHistogramMax, 0.1s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 27 SDtfs, 19 SDslu, 65 SDs, 0 SdLazy, 50 SolverSat, 1 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 52 GetRequests, 35 SyntacticMatches, 5 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=21occurred in iteration=2, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.1s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 2 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.2s InterpolantComputationTime, 76 NumberOfCodeBlocks, 76 NumberOfCodeBlocksAsserted, 4 NumberOfCheckSat, 66 ConstructedInterpolants, 0 QuantifiedInterpolants, 2400 SizeOfPredicates, 3 NumberOfNonLiveVariables, 55 ConjunctsInSsa, 6 ConjunctsInUnsatCore, 4 InterpolantComputations, 1 PerfectInterpolantSequences, 5/12 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...