./Ultimate.py --spec ../../sv-benchmarks/c/properties/no-overflow.prp --file ../../sv-benchmarks/c/termination-crafted/Ackermann-1.c --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for overflows Using default analysis Version a4ecdabc Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_4d5d947a-595f-4109-913c-160a2c9de4c7/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_4d5d947a-595f-4109-913c-160a2c9de4c7/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_4d5d947a-595f-4109-913c-160a2c9de4c7/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_4d5d947a-595f-4109-913c-160a2c9de4c7/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/termination-crafted/Ackermann-1.c -s /tmp/vcloud-vcloud-master/worker/run_dir_4d5d947a-595f-4109-913c-160a2c9de4c7/bin/utaipan/config/svcomp-Overflow-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_4d5d947a-595f-4109-913c-160a2c9de4c7/bin/utaipan --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! overflow) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 64bit --witnessprinter.graph.data.programhash 5917ee93972738bd406398210804e4342159e8a8 ................................................................................................................................................................................................................................................ Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE(OVERFLOW) --- Real Ultimate output --- This is Ultimate 0.2.0-a4ecdab [2020-11-30 01:45:00,666 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-30 01:45:00,669 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-30 01:45:00,738 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-30 01:45:00,738 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-30 01:45:00,740 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-30 01:45:00,774 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-30 01:45:00,783 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-30 01:45:00,785 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-30 01:45:00,787 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-30 01:45:00,790 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-30 01:45:00,794 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-30 01:45:00,795 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-30 01:45:00,805 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-30 01:45:00,808 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-30 01:45:00,811 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-30 01:45:00,812 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-30 01:45:00,816 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-30 01:45:00,823 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-30 01:45:00,832 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-30 01:45:00,835 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-30 01:45:00,837 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-30 01:45:00,840 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-30 01:45:00,841 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-30 01:45:00,849 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-30 01:45:00,850 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-30 01:45:00,850 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-30 01:45:00,853 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-30 01:45:00,853 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-30 01:45:00,855 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-30 01:45:00,856 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-30 01:45:00,857 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-30 01:45:00,860 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-30 01:45:00,862 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-30 01:45:00,864 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-30 01:45:00,864 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-30 01:45:00,865 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-30 01:45:00,866 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-30 01:45:00,866 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-30 01:45:00,869 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-30 01:45:00,870 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-30 01:45:00,873 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_4d5d947a-595f-4109-913c-160a2c9de4c7/bin/utaipan/config/svcomp-Overflow-64bit-Taipan_Default.epf [2020-11-30 01:45:00,937 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-30 01:45:00,937 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-30 01:45:00,939 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-11-30 01:45:00,940 INFO L138 SettingsManager]: * User list type=DISABLED [2020-11-30 01:45:00,940 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-11-30 01:45:00,941 INFO L138 SettingsManager]: * Explicit value domain=true [2020-11-30 01:45:00,941 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-11-30 01:45:00,941 INFO L138 SettingsManager]: * Octagon Domain=false [2020-11-30 01:45:00,941 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-11-30 01:45:00,942 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-11-30 01:45:00,943 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-11-30 01:45:00,943 INFO L138 SettingsManager]: * Interval Domain=false [2020-11-30 01:45:00,944 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-11-30 01:45:00,944 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-11-30 01:45:00,944 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-11-30 01:45:00,945 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-30 01:45:00,946 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2020-11-30 01:45:00,946 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-30 01:45:00,946 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-30 01:45:00,947 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-30 01:45:00,947 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-30 01:45:00,947 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-30 01:45:00,948 INFO L138 SettingsManager]: * Check absence of signed integer overflows=true [2020-11-30 01:45:00,948 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-30 01:45:00,948 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-30 01:45:00,949 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-30 01:45:00,949 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-30 01:45:00,950 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-30 01:45:00,950 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-30 01:45:00,952 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-30 01:45:00,952 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-30 01:45:00,953 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-30 01:45:00,953 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-30 01:45:00,953 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-11-30 01:45:00,954 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-30 01:45:00,954 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-30 01:45:00,954 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-30 01:45:00,955 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-11-30 01:45:00,955 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud-vcloud-master/worker/run_dir_4d5d947a-595f-4109-913c-160a2c9de4c7/bin/utaipan/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_4d5d947a-595f-4109-913c-160a2c9de4c7/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! overflow) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5917ee93972738bd406398210804e4342159e8a8 [2020-11-30 01:45:01,317 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-30 01:45:01,354 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-30 01:45:01,358 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-30 01:45:01,360 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-30 01:45:01,361 INFO L275 PluginConnector]: CDTParser initialized [2020-11-30 01:45:01,362 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_4d5d947a-595f-4109-913c-160a2c9de4c7/bin/utaipan/../../sv-benchmarks/c/termination-crafted/Ackermann-1.c [2020-11-30 01:45:01,448 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_4d5d947a-595f-4109-913c-160a2c9de4c7/bin/utaipan/data/fcbe58495/6847a05c04674a289bde9281d2e532e3/FLAG38492bb15 [2020-11-30 01:45:02,034 INFO L306 CDTParser]: Found 1 translation units. [2020-11-30 01:45:02,036 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_4d5d947a-595f-4109-913c-160a2c9de4c7/sv-benchmarks/c/termination-crafted/Ackermann-1.c [2020-11-30 01:45:02,050 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_4d5d947a-595f-4109-913c-160a2c9de4c7/bin/utaipan/data/fcbe58495/6847a05c04674a289bde9281d2e532e3/FLAG38492bb15 [2020-11-30 01:45:02,397 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_4d5d947a-595f-4109-913c-160a2c9de4c7/bin/utaipan/data/fcbe58495/6847a05c04674a289bde9281d2e532e3 [2020-11-30 01:45:02,403 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-30 01:45:02,405 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-30 01:45:02,408 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-30 01:45:02,408 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-30 01:45:02,416 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-30 01:45:02,418 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 30.11 01:45:02" (1/1) ... [2020-11-30 01:45:02,421 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@205a22c5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:45:02, skipping insertion in model container [2020-11-30 01:45:02,421 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 30.11 01:45:02" (1/1) ... [2020-11-30 01:45:02,435 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-30 01:45:02,458 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-30 01:45:02,632 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-30 01:45:02,637 INFO L203 MainTranslator]: Completed pre-run [2020-11-30 01:45:02,657 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-30 01:45:02,690 INFO L208 MainTranslator]: Completed translation [2020-11-30 01:45:02,691 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:45:02 WrapperNode [2020-11-30 01:45:02,691 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-30 01:45:02,702 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-30 01:45:02,702 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-30 01:45:02,703 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-30 01:45:02,715 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:45:02" (1/1) ... [2020-11-30 01:45:02,722 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:45:02" (1/1) ... [2020-11-30 01:45:02,746 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-30 01:45:02,748 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-30 01:45:02,748 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-30 01:45:02,748 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-30 01:45:02,758 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:45:02" (1/1) ... [2020-11-30 01:45:02,759 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:45:02" (1/1) ... [2020-11-30 01:45:02,760 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:45:02" (1/1) ... [2020-11-30 01:45:02,761 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:45:02" (1/1) ... [2020-11-30 01:45:02,763 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:45:02" (1/1) ... [2020-11-30 01:45:02,766 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:45:02" (1/1) ... [2020-11-30 01:45:02,767 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:45:02" (1/1) ... [2020-11-30 01:45:02,769 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-30 01:45:02,770 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-30 01:45:02,771 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-30 01:45:02,771 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-30 01:45:02,773 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:45:02" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_4d5d947a-595f-4109-913c-160a2c9de4c7/bin/utaipan/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-30 01:45:02,843 INFO L130 BoogieDeclarations]: Found specification of procedure Ack [2020-11-30 01:45:02,843 INFO L138 BoogieDeclarations]: Found implementation of procedure Ack [2020-11-30 01:45:02,843 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-30 01:45:02,844 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-30 01:45:03,322 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-30 01:45:03,322 INFO L298 CfgBuilder]: Removed 4 assume(true) statements. [2020-11-30 01:45:03,324 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 01:45:03 BoogieIcfgContainer [2020-11-30 01:45:03,324 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-30 01:45:03,326 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-30 01:45:03,327 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-30 01:45:03,334 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-30 01:45:03,334 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 30.11 01:45:02" (1/3) ... [2020-11-30 01:45:03,335 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15a21856 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.11 01:45:03, skipping insertion in model container [2020-11-30 01:45:03,335 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:45:02" (2/3) ... [2020-11-30 01:45:03,336 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15a21856 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.11 01:45:03, skipping insertion in model container [2020-11-30 01:45:03,336 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 01:45:03" (3/3) ... [2020-11-30 01:45:03,338 INFO L111 eAbstractionObserver]: Analyzing ICFG Ackermann-1.c [2020-11-30 01:45:03,353 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-30 01:45:03,358 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 8 error locations. [2020-11-30 01:45:03,373 INFO L253 AbstractCegarLoop]: Starting to check reachability of 8 error locations. [2020-11-30 01:45:03,420 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-30 01:45:03,421 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-30 01:45:03,421 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-30 01:45:03,421 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-30 01:45:03,421 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-30 01:45:03,421 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-30 01:45:03,421 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-30 01:45:03,422 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-30 01:45:03,444 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-11-30 01:45:03,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2020-11-30 01:45:03,452 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 01:45:03,453 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2020-11-30 01:45:03,453 INFO L429 AbstractCegarLoop]: === Iteration 1 === [AckErr4ASSERT_VIOLATIONINTEGER_OVERFLOW, AckErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, AckErr3ASSERT_VIOLATIONINTEGER_OVERFLOW, AckErr1ASSERT_VIOLATIONINTEGER_OVERFLOW, AckErr2ASSERT_VIOLATIONINTEGER_OVERFLOW, AckErr6ASSERT_VIOLATIONINTEGER_OVERFLOW, AckErr5ASSERT_VIOLATIONINTEGER_OVERFLOW, AckErr7ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2020-11-30 01:45:03,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 01:45:03,462 INFO L82 PathProgramCache]: Analyzing trace with hash 1868849109, now seen corresponding path program 1 times [2020-11-30 01:45:03,474 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 01:45:03,475 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [181274685] [2020-11-30 01:45:03,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 01:45:03,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-30 01:45:03,607 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-30 01:45:03,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-30 01:45:03,636 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-30 01:45:03,663 INFO L173 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2020-11-30 01:45:03,664 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-30 01:45:03,665 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-30 01:45:03,695 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 30.11 01:45:03 BoogieIcfgContainer [2020-11-30 01:45:03,695 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-30 01:45:03,697 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-30 01:45:03,698 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-30 01:45:03,698 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-30 01:45:03,699 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 01:45:03" (3/4) ... [2020-11-30 01:45:03,703 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-11-30 01:45:03,765 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_4d5d947a-595f-4109-913c-160a2c9de4c7/bin/utaipan/witness.graphml [2020-11-30 01:45:03,765 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-30 01:45:03,768 INFO L168 Benchmark]: Toolchain (without parser) took 1361.26 ms. Allocated memory is still 79.7 MB. Free memory was 48.7 MB in the beginning and 32.2 MB in the end (delta: 16.5 MB). Peak memory consumption was 13.9 MB. Max. memory is 16.1 GB. [2020-11-30 01:45:03,770 INFO L168 Benchmark]: CDTParser took 0.34 ms. Allocated memory is still 79.7 MB. Free memory was 38.6 MB in the beginning and 38.6 MB in the end (delta: 35.0 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-30 01:45:03,771 INFO L168 Benchmark]: CACSL2BoogieTranslator took 292.67 ms. Allocated memory is still 79.7 MB. Free memory was 48.6 MB in the beginning and 59.0 MB in the end (delta: -10.5 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-11-30 01:45:03,772 INFO L168 Benchmark]: Boogie Procedure Inliner took 44.65 ms. Allocated memory is still 79.7 MB. Free memory was 59.0 MB in the beginning and 57.8 MB in the end (delta: 1.2 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-30 01:45:03,773 INFO L168 Benchmark]: Boogie Preprocessor took 21.99 ms. Allocated memory is still 79.7 MB. Free memory was 57.8 MB in the beginning and 56.8 MB in the end (delta: 1.0 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-30 01:45:03,774 INFO L168 Benchmark]: RCFGBuilder took 554.24 ms. Allocated memory is still 79.7 MB. Free memory was 56.8 MB in the beginning and 45.2 MB in the end (delta: 11.6 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2020-11-30 01:45:03,775 INFO L168 Benchmark]: TraceAbstraction took 368.58 ms. Allocated memory is still 79.7 MB. Free memory was 44.9 MB in the beginning and 34.0 MB in the end (delta: 10.9 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2020-11-30 01:45:03,777 INFO L168 Benchmark]: Witness Printer took 68.33 ms. Allocated memory is still 79.7 MB. Free memory was 33.7 MB in the beginning and 32.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-30 01:45:03,786 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.34 ms. Allocated memory is still 79.7 MB. Free memory was 38.6 MB in the beginning and 38.6 MB in the end (delta: 35.0 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 292.67 ms. Allocated memory is still 79.7 MB. Free memory was 48.6 MB in the beginning and 59.0 MB in the end (delta: -10.5 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 44.65 ms. Allocated memory is still 79.7 MB. Free memory was 59.0 MB in the beginning and 57.8 MB in the end (delta: 1.2 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 21.99 ms. Allocated memory is still 79.7 MB. Free memory was 57.8 MB in the beginning and 56.8 MB in the end (delta: 1.0 MB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 554.24 ms. Allocated memory is still 79.7 MB. Free memory was 56.8 MB in the beginning and 45.2 MB in the end (delta: 11.6 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * TraceAbstraction took 368.58 ms. Allocated memory is still 79.7 MB. Free memory was 44.9 MB in the beginning and 34.0 MB in the end (delta: 10.9 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * Witness Printer took 68.33 ms. Allocated memory is still 79.7 MB. Free memory was 33.7 MB in the beginning and 32.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 10]: integer overflow possible integer overflow possible We found a FailurePath: [L16] int x = __VERIFIER_nondet_int(); [L17] int y = __VERIFIER_nondet_int(); [L18] COND FALSE !(x < 0 || y < 0) [L21] CALL Ack(x, y) VAL [\old(m)=0, \old(n)=2147483647] [L10] COND TRUE m == 0 VAL [\old(m)=0, \old(n)=2147483647, m=0, n=2147483647] [L10] n+1 VAL [\old(m)=0, \old(n)=2147483647, m=0, n=2147483647] - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 33 locations, 8 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 0.2s, OverallIterations: 1, TraceHistogramMax: 1, AutomataDifference: 0.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: No data available, PredicateUnifierStatistics: No data available, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=33occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: No data available, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.0s InterpolantComputationTime, 6 NumberOfCodeBlocks, 6 NumberOfCodeBlocksAsserted, 1 NumberOfCheckSat, 0 ConstructedInterpolants, 0 QuantifiedInterpolants, 0 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 0 InterpolantComputations, 0 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...