./Ultimate.py --spec ../../sv-benchmarks/c/properties/no-overflow.prp --file ../../sv-benchmarks/c/termination-crafted/NestedRecursion_2a.c --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for overflows Using default analysis Version 7b2dab56 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_f091006a-6b78-429c-bafb-29591385f24a/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_f091006a-6b78-429c-bafb-29591385f24a/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_f091006a-6b78-429c-bafb-29591385f24a/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_f091006a-6b78-429c-bafb-29591385f24a/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/termination-crafted/NestedRecursion_2a.c -s /tmp/vcloud-vcloud-master/worker/run_dir_f091006a-6b78-429c-bafb-29591385f24a/bin/utaipan/config/svcomp-Overflow-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_f091006a-6b78-429c-bafb-29591385f24a/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 a87305f2bf70381ae4b40b8cfb9e2ca1c7e8a065 ................................................................................................................................................................................................................................................................................... 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 0.2.0-7b2dab5 [2020-12-03 12:33:54,373 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-03 12:33:54,376 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-03 12:33:54,464 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-03 12:33:54,476 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-03 12:33:54,478 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-03 12:33:54,480 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-03 12:33:54,484 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-03 12:33:54,486 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-03 12:33:54,488 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-03 12:33:54,490 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-03 12:33:54,491 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-03 12:33:54,492 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-03 12:33:54,494 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-03 12:33:54,495 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-03 12:33:54,497 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-03 12:33:54,498 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-03 12:33:54,500 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-03 12:33:54,502 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-03 12:33:54,505 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-03 12:33:54,507 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-03 12:33:54,509 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-03 12:33:54,511 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-03 12:33:54,512 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-03 12:33:54,516 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-12-03 12:33:54,517 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-12-03 12:33:54,517 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-12-03 12:33:54,519 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-12-03 12:33:54,519 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-12-03 12:33:54,521 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-12-03 12:33:54,521 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-03 12:33:54,523 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-03 12:33:54,524 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-03 12:33:54,525 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-03 12:33:54,527 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-03 12:33:54,527 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-03 12:33:54,528 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-03 12:33:54,528 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-03 12:33:54,529 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-03 12:33:54,530 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-03 12:33:54,531 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-03 12:33:54,532 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_f091006a-6b78-429c-bafb-29591385f24a/bin/utaipan/config/svcomp-Overflow-64bit-Taipan_Default.epf [2020-12-03 12:33:54,556 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-03 12:33:54,557 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-03 12:33:54,558 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-12-03 12:33:54,558 INFO L138 SettingsManager]: * User list type=DISABLED [2020-12-03 12:33:54,558 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-12-03 12:33:54,559 INFO L138 SettingsManager]: * Explicit value domain=true [2020-12-03 12:33:54,559 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-12-03 12:33:54,559 INFO L138 SettingsManager]: * Octagon Domain=false [2020-12-03 12:33:54,560 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-12-03 12:33:54,560 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-12-03 12:33:54,560 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-12-03 12:33:54,561 INFO L138 SettingsManager]: * Interval Domain=false [2020-12-03 12:33:54,561 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-12-03 12:33:54,561 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-12-03 12:33:54,562 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-12-03 12:33:54,562 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-03 12:33:54,563 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2020-12-03 12:33:54,563 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-03 12:33:54,563 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-03 12:33:54,564 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-03 12:33:54,564 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-03 12:33:54,564 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-03 12:33:54,565 INFO L138 SettingsManager]: * Check absence of signed integer overflows=true [2020-12-03 12:33:54,565 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-03 12:33:54,565 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-03 12:33:54,566 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-03 12:33:54,566 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-03 12:33:54,566 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-03 12:33:54,567 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-03 12:33:54,567 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-03 12:33:54,567 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-03 12:33:54,568 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-03 12:33:54,568 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-12-03 12:33:54,568 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-03 12:33:54,569 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-03 12:33:54,569 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-03 12:33:54,569 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-12-03 12:33:54,570 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_f091006a-6b78-429c-bafb-29591385f24a/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_f091006a-6b78-429c-bafb-29591385f24a/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! overflow) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a87305f2bf70381ae4b40b8cfb9e2ca1c7e8a065 [2020-12-03 12:33:54,845 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-03 12:33:54,896 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-03 12:33:54,900 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-03 12:33:54,902 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-03 12:33:54,903 INFO L275 PluginConnector]: CDTParser initialized [2020-12-03 12:33:54,904 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_f091006a-6b78-429c-bafb-29591385f24a/bin/utaipan/../../sv-benchmarks/c/termination-crafted/NestedRecursion_2a.c [2020-12-03 12:33:54,990 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_f091006a-6b78-429c-bafb-29591385f24a/bin/utaipan/data/f9e56d98d/3283d8815f1b41b48f1d6a75dfc84d50/FLAG2212917f5 [2020-12-03 12:33:55,437 INFO L306 CDTParser]: Found 1 translation units. [2020-12-03 12:33:55,438 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_f091006a-6b78-429c-bafb-29591385f24a/sv-benchmarks/c/termination-crafted/NestedRecursion_2a.c [2020-12-03 12:33:55,444 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_f091006a-6b78-429c-bafb-29591385f24a/bin/utaipan/data/f9e56d98d/3283d8815f1b41b48f1d6a75dfc84d50/FLAG2212917f5 [2020-12-03 12:33:55,837 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_f091006a-6b78-429c-bafb-29591385f24a/bin/utaipan/data/f9e56d98d/3283d8815f1b41b48f1d6a75dfc84d50 [2020-12-03 12:33:55,839 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-03 12:33:55,841 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-03 12:33:55,843 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-03 12:33:55,843 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-03 12:33:55,847 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-03 12:33:55,848 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.12 12:33:55" (1/1) ... [2020-12-03 12:33:55,856 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@26d1dbcc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:33:55, skipping insertion in model container [2020-12-03 12:33:55,856 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.12 12:33:55" (1/1) ... [2020-12-03 12:33:55,864 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-03 12:33:55,880 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-03 12:33:56,031 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-03 12:33:56,039 INFO L203 MainTranslator]: Completed pre-run [2020-12-03 12:33:56,068 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-03 12:33:56,081 INFO L208 MainTranslator]: Completed translation [2020-12-03 12:33:56,082 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:33:56 WrapperNode [2020-12-03 12:33:56,083 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-03 12:33:56,085 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-03 12:33:56,085 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-03 12:33:56,085 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-03 12:33:56,095 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:33:56" (1/1) ... [2020-12-03 12:33:56,100 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:33:56" (1/1) ... [2020-12-03 12:33:56,118 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-03 12:33:56,120 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-03 12:33:56,120 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-03 12:33:56,121 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-03 12:33:56,130 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:33:56" (1/1) ... [2020-12-03 12:33:56,130 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:33:56" (1/1) ... [2020-12-03 12:33:56,132 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:33:56" (1/1) ... [2020-12-03 12:33:56,133 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:33:56" (1/1) ... [2020-12-03 12:33:56,135 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:33:56" (1/1) ... [2020-12-03 12:33:56,137 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:33:56" (1/1) ... [2020-12-03 12:33:56,138 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:33:56" (1/1) ... [2020-12-03 12:33:56,140 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-03 12:33:56,142 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-03 12:33:56,143 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-03 12:33:56,144 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-03 12:33:56,145 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:33:56" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_f091006a-6b78-429c-bafb-29591385f24a/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 [2020-12-03 12:33:56,237 INFO L130 BoogieDeclarations]: Found specification of procedure g [2020-12-03 12:33:56,238 INFO L138 BoogieDeclarations]: Found implementation of procedure g [2020-12-03 12:33:56,238 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-03 12:33:56,238 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-03 12:33:56,488 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-03 12:33:56,488 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2020-12-03 12:33:56,491 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 12:33:56 BoogieIcfgContainer [2020-12-03 12:33:56,491 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-03 12:33:56,493 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-03 12:33:56,495 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-03 12:33:56,498 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-03 12:33:56,499 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.12 12:33:55" (1/3) ... [2020-12-03 12:33:56,500 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@f7cfe9e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 12:33:56, skipping insertion in model container [2020-12-03 12:33:56,501 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:33:56" (2/3) ... [2020-12-03 12:33:56,501 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@f7cfe9e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 12:33:56, skipping insertion in model container [2020-12-03 12:33:56,501 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 12:33:56" (3/3) ... [2020-12-03 12:33:56,503 INFO L111 eAbstractionObserver]: Analyzing ICFG NestedRecursion_2a.c [2020-12-03 12:33:56,521 INFO L180 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-03 12:33:56,529 INFO L192 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2020-12-03 12:33:56,539 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2020-12-03 12:33:56,559 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-03 12:33:56,560 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-03 12:33:56,560 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-03 12:33:56,560 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-03 12:33:56,560 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-03 12:33:56,561 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-03 12:33:56,561 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-03 12:33:56,561 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-03 12:33:56,575 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states. [2020-12-03 12:33:56,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2020-12-03 12:33:56,580 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:33:56,581 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2020-12-03 12:33:56,582 INFO L429 AbstractCegarLoop]: === Iteration 1 === [gErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr1ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2020-12-03 12:33:56,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:33:56,588 INFO L82 PathProgramCache]: Analyzing trace with hash 43226870, now seen corresponding path program 1 times [2020-12-03 12:33:56,597 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:33:56,598 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [689491502] [2020-12-03 12:33:56,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:33:56,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:33:56,751 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-03 12:33:56,752 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [689491502] [2020-12-03 12:33:56,753 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-03 12:33:56,753 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-03 12:33:56,754 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [441775775] [2020-12-03 12:33:56,758 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-03 12:33:56,759 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-03 12:33:56,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-03 12:33:56,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-03 12:33:56,775 INFO L87 Difference]: Start difference. First operand 16 states. Second operand 5 states. [2020-12-03 12:33:56,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:33:56,906 INFO L93 Difference]: Finished difference Result 30 states and 36 transitions. [2020-12-03 12:33:56,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-03 12:33:56,908 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 5 [2020-12-03 12:33:56,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:33:56,916 INFO L225 Difference]: With dead ends: 30 [2020-12-03 12:33:56,917 INFO L226 Difference]: Without dead ends: 27 [2020-12-03 12:33:56,919 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-12-03 12:33:56,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-12-03 12:33:56,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2020-12-03 12:33:56,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-12-03 12:33:56,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2020-12-03 12:33:56,960 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 5 [2020-12-03 12:33:56,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:33:56,961 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2020-12-03 12:33:56,961 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-03 12:33:56,961 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2020-12-03 12:33:56,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2020-12-03 12:33:56,962 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:33:56,962 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2020-12-03 12:33:56,962 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-03 12:33:56,963 INFO L429 AbstractCegarLoop]: === Iteration 2 === [gErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr1ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2020-12-03 12:33:56,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:33:56,964 INFO L82 PathProgramCache]: Analyzing trace with hash 1340033008, now seen corresponding path program 1 times [2020-12-03 12:33:56,964 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:33:56,964 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [593592908] [2020-12-03 12:33:56,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:33:56,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-03 12:33:56,973 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-03 12:33:56,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-03 12:33:56,979 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-03 12:33:56,993 INFO L173 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2020-12-03 12:33:56,993 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-12-03 12:33:56,995 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-12-03 12:33:57,014 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 03.12 12:33:57 BoogieIcfgContainer [2020-12-03 12:33:57,014 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-03 12:33:57,015 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-03 12:33:57,015 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-03 12:33:57,015 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-03 12:33:57,016 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 12:33:56" (3/4) ... [2020-12-03 12:33:57,018 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-12-03 12:33:57,050 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_f091006a-6b78-429c-bafb-29591385f24a/bin/utaipan/witness.graphml [2020-12-03 12:33:57,050 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-03 12:33:57,053 INFO L168 Benchmark]: Toolchain (without parser) took 1210.69 ms. Allocated memory was 86.0 MB in the beginning and 115.3 MB in the end (delta: 29.4 MB). Free memory was 53.3 MB in the beginning and 52.1 MB in the end (delta: 1.2 MB). Peak memory consumption was 26.6 MB. Max. memory is 16.1 GB. [2020-12-03 12:33:57,054 INFO L168 Benchmark]: CDTParser took 0.27 ms. Allocated memory is still 86.0 MB. Free memory was 57.6 MB in the beginning and 57.6 MB in the end (delta: 30.2 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-03 12:33:57,055 INFO L168 Benchmark]: CACSL2BoogieTranslator took 240.02 ms. Allocated memory was 86.0 MB in the beginning and 115.3 MB in the end (delta: 29.4 MB). Free memory was 53.0 MB in the beginning and 94.0 MB in the end (delta: -41.0 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-12-03 12:33:57,056 INFO L168 Benchmark]: Boogie Procedure Inliner took 33.72 ms. Allocated memory is still 115.3 MB. Free memory was 94.0 MB in the beginning and 92.8 MB in the end (delta: 1.2 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-03 12:33:57,057 INFO L168 Benchmark]: Boogie Preprocessor took 20.26 ms. Allocated memory is still 115.3 MB. Free memory was 92.8 MB in the beginning and 92.2 MB in the end (delta: 614.2 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-03 12:33:57,059 INFO L168 Benchmark]: RCFGBuilder took 349.38 ms. Allocated memory is still 115.3 MB. Free memory was 92.2 MB in the beginning and 81.6 MB in the end (delta: 10.6 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2020-12-03 12:33:57,068 INFO L168 Benchmark]: TraceAbstraction took 521.43 ms. Allocated memory is still 115.3 MB. Free memory was 81.4 MB in the beginning and 53.6 MB in the end (delta: 27.9 MB). Peak memory consumption was 29.4 MB. Max. memory is 16.1 GB. [2020-12-03 12:33:57,069 INFO L168 Benchmark]: Witness Printer took 35.69 ms. Allocated memory is still 115.3 MB. Free memory was 53.6 MB in the beginning and 52.1 MB in the end (delta: 1.5 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-03 12:33:57,076 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27 ms. Allocated memory is still 86.0 MB. Free memory was 57.6 MB in the beginning and 57.6 MB in the end (delta: 30.2 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 240.02 ms. Allocated memory was 86.0 MB in the beginning and 115.3 MB in the end (delta: 29.4 MB). Free memory was 53.0 MB in the beginning and 94.0 MB in the end (delta: -41.0 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 33.72 ms. Allocated memory is still 115.3 MB. Free memory was 94.0 MB in the beginning and 92.8 MB in the end (delta: 1.2 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 20.26 ms. Allocated memory is still 115.3 MB. Free memory was 92.8 MB in the beginning and 92.2 MB in the end (delta: 614.2 kB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 349.38 ms. Allocated memory is still 115.3 MB. Free memory was 92.2 MB in the beginning and 81.6 MB in the end (delta: 10.6 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * TraceAbstraction took 521.43 ms. Allocated memory is still 115.3 MB. Free memory was 81.4 MB in the beginning and 53.6 MB in the end (delta: 27.9 MB). Peak memory consumption was 29.4 MB. Max. memory is 16.1 GB. * Witness Printer took 35.69 ms. Allocated memory is still 115.3 MB. Free memory was 53.6 MB in the beginning and 52.1 MB in the end (delta: 1.5 MB). There was no memory consumed. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 15]: integer overflow possible integer overflow possible We found a FailurePath: [L19] int x = __VERIFIER_nondet_int(); [L20] CALL g(x) VAL [\old(x)=-2147483648] [L12] COND FALSE !(x == 0) VAL [\old(x)=-2147483648, x=-2147483648] [L15] x - 1 VAL [\old(x)=-2147483648, x=-2147483648] - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 16 locations, 2 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 0.4s, OverallIterations: 2, TraceHistogramMax: 1, AutomataDifference: 0.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 12 SDtfs, 18 SDslu, 29 SDs, 0 SdLazy, 29 SolverSat, 9 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=24occurred in iteration=1, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 1 MinimizatonAttempts, 3 StatesRemovedByMinimization, 1 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.0s InterpolantComputationTime, 11 NumberOfCodeBlocks, 11 NumberOfCodeBlocksAsserted, 2 NumberOfCheckSat, 4 ConstructedInterpolants, 0 QuantifiedInterpolants, 48 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 1 InterpolantComputations, 1 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...