./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 a4ecdabc Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_59e0cf6e-95d7-4c23-97ef-52e7d7ac8fd9/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_59e0cf6e-95d7-4c23-97ef-52e7d7ac8fd9/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_59e0cf6e-95d7-4c23-97ef-52e7d7ac8fd9/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_59e0cf6e-95d7-4c23-97ef-52e7d7ac8fd9/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/termination-crafted/NestedRecursion_2a.c -s /tmp/vcloud-vcloud-master/worker/run_dir_59e0cf6e-95d7-4c23-97ef-52e7d7ac8fd9/bin/utaipan/config/svcomp-Overflow-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_59e0cf6e-95d7-4c23-97ef-52e7d7ac8fd9/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-a4ecdab [2020-11-28 07:39:51,927 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-28 07:39:51,930 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-28 07:39:51,996 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-28 07:39:51,997 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-28 07:39:52,012 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-28 07:39:52,014 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-28 07:39:52,023 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-28 07:39:52,025 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-28 07:39:52,031 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-28 07:39:52,032 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-28 07:39:52,035 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-28 07:39:52,035 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-28 07:39:52,039 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-28 07:39:52,040 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-28 07:39:52,042 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-28 07:39:52,043 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-28 07:39:52,047 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-28 07:39:52,051 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-28 07:39:52,058 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-28 07:39:52,060 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-28 07:39:52,062 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-28 07:39:52,064 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-28 07:39:52,065 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-28 07:39:52,069 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-28 07:39:52,069 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-28 07:39:52,070 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-28 07:39:52,072 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-28 07:39:52,073 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-28 07:39:52,074 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-28 07:39:52,074 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-28 07:39:52,076 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-28 07:39:52,078 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-28 07:39:52,079 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-28 07:39:52,081 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-28 07:39:52,081 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-28 07:39:52,082 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-28 07:39:52,082 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-28 07:39:52,082 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-28 07:39:52,083 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-28 07:39:52,084 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-28 07:39:52,087 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_59e0cf6e-95d7-4c23-97ef-52e7d7ac8fd9/bin/utaipan/config/svcomp-Overflow-64bit-Taipan_Default.epf [2020-11-28 07:39:52,134 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-28 07:39:52,134 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-28 07:39:52,136 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-11-28 07:39:52,136 INFO L138 SettingsManager]: * User list type=DISABLED [2020-11-28 07:39:52,136 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-11-28 07:39:52,137 INFO L138 SettingsManager]: * Explicit value domain=true [2020-11-28 07:39:52,137 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-11-28 07:39:52,137 INFO L138 SettingsManager]: * Octagon Domain=false [2020-11-28 07:39:52,137 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-11-28 07:39:52,137 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-11-28 07:39:52,138 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-11-28 07:39:52,139 INFO L138 SettingsManager]: * Interval Domain=false [2020-11-28 07:39:52,139 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-11-28 07:39:52,139 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-11-28 07:39:52,140 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-11-28 07:39:52,140 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-28 07:39:52,141 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2020-11-28 07:39:52,141 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-28 07:39:52,141 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-28 07:39:52,141 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-28 07:39:52,141 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-28 07:39:52,142 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-28 07:39:52,142 INFO L138 SettingsManager]: * Check absence of signed integer overflows=true [2020-11-28 07:39:52,142 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-28 07:39:52,142 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-28 07:39:52,143 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-28 07:39:52,143 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-28 07:39:52,143 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-28 07:39:52,143 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-28 07:39:52,143 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-28 07:39:52,144 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-28 07:39:52,144 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-28 07:39:52,144 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-28 07:39:52,145 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-11-28 07:39:52,145 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-28 07:39:52,145 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-28 07:39:52,145 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-28 07:39:52,145 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-11-28 07:39:52,146 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_59e0cf6e-95d7-4c23-97ef-52e7d7ac8fd9/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_59e0cf6e-95d7-4c23-97ef-52e7d7ac8fd9/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! overflow) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a87305f2bf70381ae4b40b8cfb9e2ca1c7e8a065 [2020-11-28 07:39:52,378 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-28 07:39:52,402 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-28 07:39:52,405 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-28 07:39:52,406 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-28 07:39:52,407 INFO L275 PluginConnector]: CDTParser initialized [2020-11-28 07:39:52,408 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_59e0cf6e-95d7-4c23-97ef-52e7d7ac8fd9/bin/utaipan/../../sv-benchmarks/c/termination-crafted/NestedRecursion_2a.c [2020-11-28 07:39:52,480 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_59e0cf6e-95d7-4c23-97ef-52e7d7ac8fd9/bin/utaipan/data/9ee526c5c/0bf753e8d3774a3396cb5a7b2c47f163/FLAG05e78239a [2020-11-28 07:39:52,979 INFO L306 CDTParser]: Found 1 translation units. [2020-11-28 07:39:52,980 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_59e0cf6e-95d7-4c23-97ef-52e7d7ac8fd9/sv-benchmarks/c/termination-crafted/NestedRecursion_2a.c [2020-11-28 07:39:52,987 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_59e0cf6e-95d7-4c23-97ef-52e7d7ac8fd9/bin/utaipan/data/9ee526c5c/0bf753e8d3774a3396cb5a7b2c47f163/FLAG05e78239a [2020-11-28 07:39:53,365 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_59e0cf6e-95d7-4c23-97ef-52e7d7ac8fd9/bin/utaipan/data/9ee526c5c/0bf753e8d3774a3396cb5a7b2c47f163 [2020-11-28 07:39:53,368 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-28 07:39:53,371 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-28 07:39:53,376 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-28 07:39:53,376 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-28 07:39:53,382 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-28 07:39:53,385 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 07:39:53" (1/1) ... [2020-11-28 07:39:53,392 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6bf14d16 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:39:53, skipping insertion in model container [2020-11-28 07:39:53,392 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 07:39:53" (1/1) ... [2020-11-28 07:39:53,400 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-28 07:39:53,416 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-28 07:39:53,581 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-28 07:39:53,597 INFO L203 MainTranslator]: Completed pre-run [2020-11-28 07:39:53,615 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-28 07:39:53,652 INFO L208 MainTranslator]: Completed translation [2020-11-28 07:39:53,653 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:39:53 WrapperNode [2020-11-28 07:39:53,653 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-28 07:39:53,656 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-28 07:39:53,656 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-28 07:39:53,656 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-28 07:39:53,664 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:39:53" (1/1) ... [2020-11-28 07:39:53,668 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:39:53" (1/1) ... [2020-11-28 07:39:53,684 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-28 07:39:53,685 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-28 07:39:53,686 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-28 07:39:53,686 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-28 07:39:53,694 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:39:53" (1/1) ... [2020-11-28 07:39:53,695 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:39:53" (1/1) ... [2020-11-28 07:39:53,696 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:39:53" (1/1) ... [2020-11-28 07:39:53,696 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:39:53" (1/1) ... [2020-11-28 07:39:53,699 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:39:53" (1/1) ... [2020-11-28 07:39:53,701 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:39:53" (1/1) ... [2020-11-28 07:39:53,702 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:39:53" (1/1) ... [2020-11-28 07:39:53,703 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-28 07:39:53,705 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-28 07:39:53,705 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-28 07:39:53,705 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-28 07:39:53,706 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:39:53" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_59e0cf6e-95d7-4c23-97ef-52e7d7ac8fd9/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 [2020-11-28 07:39:53,791 INFO L130 BoogieDeclarations]: Found specification of procedure g [2020-11-28 07:39:53,791 INFO L138 BoogieDeclarations]: Found implementation of procedure g [2020-11-28 07:39:53,792 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-28 07:39:53,792 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-28 07:39:54,068 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-28 07:39:54,068 INFO L298 CfgBuilder]: Removed 4 assume(true) statements. [2020-11-28 07:39:54,071 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 07:39:54 BoogieIcfgContainer [2020-11-28 07:39:54,071 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-28 07:39:54,072 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-28 07:39:54,073 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-28 07:39:54,077 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-28 07:39:54,077 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 28.11 07:39:53" (1/3) ... [2020-11-28 07:39:54,078 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7447e212 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 07:39:54, skipping insertion in model container [2020-11-28 07:39:54,078 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:39:53" (2/3) ... [2020-11-28 07:39:54,079 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7447e212 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 07:39:54, skipping insertion in model container [2020-11-28 07:39:54,079 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 07:39:54" (3/3) ... [2020-11-28 07:39:54,080 INFO L111 eAbstractionObserver]: Analyzing ICFG NestedRecursion_2a.c [2020-11-28 07:39:54,107 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-28 07:39:54,114 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2020-11-28 07:39:54,127 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2020-11-28 07:39:54,163 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-28 07:39:54,164 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-28 07:39:54,164 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-28 07:39:54,164 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-28 07:39:54,164 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-28 07:39:54,164 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-28 07:39:54,165 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-28 07:39:54,165 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-28 07:39:54,183 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states. [2020-11-28 07:39:54,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2020-11-28 07:39:54,188 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:39:54,189 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2020-11-28 07:39:54,189 INFO L429 AbstractCegarLoop]: === Iteration 1 === [gErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr1ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2020-11-28 07:39:54,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:39:54,198 INFO L82 PathProgramCache]: Analyzing trace with hash 43226870, now seen corresponding path program 1 times [2020-11-28 07:39:54,210 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:39:54,211 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1833971814] [2020-11-28 07:39:54,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:39:54,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:39:54,437 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 07:39:54,438 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1833971814] [2020-11-28 07:39:54,439 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 07:39:54,439 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-11-28 07:39:54,440 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1286014292] [2020-11-28 07:39:54,444 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-11-28 07:39:54,445 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:39:54,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-11-28 07:39:54,462 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-11-28 07:39:54,464 INFO L87 Difference]: Start difference. First operand 16 states. Second operand 5 states. [2020-11-28 07:39:54,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:39:54,685 INFO L93 Difference]: Finished difference Result 30 states and 36 transitions. [2020-11-28 07:39:54,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-28 07:39:54,687 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 5 [2020-11-28 07:39:54,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:39:54,697 INFO L225 Difference]: With dead ends: 30 [2020-11-28 07:39:54,697 INFO L226 Difference]: Without dead ends: 27 [2020-11-28 07:39:54,700 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-11-28 07:39:54,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-11-28 07:39:54,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2020-11-28 07:39:54,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-11-28 07:39:54,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2020-11-28 07:39:54,746 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 5 [2020-11-28 07:39:54,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:39:54,747 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2020-11-28 07:39:54,747 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-11-28 07:39:54,747 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2020-11-28 07:39:54,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2020-11-28 07:39:54,748 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:39:54,748 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2020-11-28 07:39:54,748 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-28 07:39:54,749 INFO L429 AbstractCegarLoop]: === Iteration 2 === [gErr0ASSERT_VIOLATIONINTEGER_OVERFLOW, gErr1ASSERT_VIOLATIONINTEGER_OVERFLOW]=== [2020-11-28 07:39:54,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:39:54,750 INFO L82 PathProgramCache]: Analyzing trace with hash 1340033008, now seen corresponding path program 1 times [2020-11-28 07:39:54,750 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:39:54,751 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [183729261] [2020-11-28 07:39:54,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:39:54,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 07:39:54,759 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 07:39:54,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 07:39:54,766 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 07:39:54,803 INFO L173 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2020-11-28 07:39:54,804 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-28 07:39:54,805 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-28 07:39:54,824 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 28.11 07:39:54 BoogieIcfgContainer [2020-11-28 07:39:54,824 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-28 07:39:54,825 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-28 07:39:54,825 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-28 07:39:54,825 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-28 07:39:54,826 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 07:39:54" (3/4) ... [2020-11-28 07:39:54,828 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-11-28 07:39:54,858 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_59e0cf6e-95d7-4c23-97ef-52e7d7ac8fd9/bin/utaipan/witness.graphml [2020-11-28 07:39:54,858 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-28 07:39:54,860 INFO L168 Benchmark]: Toolchain (without parser) took 1488.18 ms. Allocated memory is still 132.1 MB. Free memory was 105.9 MB in the beginning and 107.6 MB in the end (delta: -1.7 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 07:39:54,861 INFO L168 Benchmark]: CDTParser took 0.18 ms. Allocated memory is still 83.9 MB. Free memory is still 42.4 MB. There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 07:39:54,862 INFO L168 Benchmark]: CACSL2BoogieTranslator took 278.02 ms. Allocated memory is still 132.1 MB. Free memory was 105.6 MB in the beginning and 111.3 MB in the end (delta: -5.7 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2020-11-28 07:39:54,862 INFO L168 Benchmark]: Boogie Procedure Inliner took 28.28 ms. Allocated memory is still 132.1 MB. Free memory was 111.3 MB in the beginning and 110.0 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 07:39:54,863 INFO L168 Benchmark]: Boogie Preprocessor took 18.68 ms. Allocated memory is still 132.1 MB. Free memory was 110.0 MB in the beginning and 109.3 MB in the end (delta: 734.8 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 07:39:54,864 INFO L168 Benchmark]: RCFGBuilder took 365.99 ms. Allocated memory is still 132.1 MB. Free memory was 109.3 MB in the beginning and 99.7 MB in the end (delta: 9.6 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2020-11-28 07:39:54,865 INFO L168 Benchmark]: TraceAbstraction took 751.61 ms. Allocated memory is still 132.1 MB. Free memory was 99.1 MB in the beginning and 109.4 MB in the end (delta: -10.3 MB). Peak memory consumption was 31.0 MB. Max. memory is 16.1 GB. [2020-11-28 07:39:54,865 INFO L168 Benchmark]: Witness Printer took 33.95 ms. Allocated memory is still 132.1 MB. Free memory was 109.4 MB in the beginning and 107.6 MB in the end (delta: 1.8 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-28 07:39:54,868 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18 ms. Allocated memory is still 83.9 MB. Free memory is still 42.4 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 278.02 ms. Allocated memory is still 132.1 MB. Free memory was 105.6 MB in the beginning and 111.3 MB in the end (delta: -5.7 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 28.28 ms. Allocated memory is still 132.1 MB. Free memory was 111.3 MB in the beginning and 110.0 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 18.68 ms. Allocated memory is still 132.1 MB. Free memory was 110.0 MB in the beginning and 109.3 MB in the end (delta: 734.8 kB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 365.99 ms. Allocated memory is still 132.1 MB. Free memory was 109.3 MB in the beginning and 99.7 MB in the end (delta: 9.6 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * TraceAbstraction took 751.61 ms. Allocated memory is still 132.1 MB. Free memory was 99.1 MB in the beginning and 109.4 MB in the end (delta: -10.3 MB). Peak memory consumption was 31.0 MB. Max. memory is 16.1 GB. * Witness Printer took 33.95 ms. Allocated memory is still 132.1 MB. Free memory was 109.4 MB in the beginning and 107.6 MB in the end (delta: 1.8 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: 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: 0.6s, OverallIterations: 2, TraceHistogramMax: 1, AutomataDifference: 0.2s, 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, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s 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, 0.1s 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...