./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/recursive-simple/afterrec-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 6c24879c Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/recursive-simple/afterrec-1.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash bd3dbeb1201d252c8f1e3c61a135802ff8f8ccfcc09353f09b9750e3ee951591 --- Real Ultimate output --- This is Ultimate 0.2.2-?-6c24879 [2022-07-12 06:22:04,005 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-07-12 06:22:04,007 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-07-12 06:22:04,072 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-07-12 06:22:04,073 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-07-12 06:22:04,074 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-07-12 06:22:04,074 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-07-12 06:22:04,076 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-07-12 06:22:04,077 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-07-12 06:22:04,077 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-07-12 06:22:04,078 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-07-12 06:22:04,080 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-07-12 06:22:04,081 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-07-12 06:22:04,082 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-07-12 06:22:04,083 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-07-12 06:22:04,085 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-07-12 06:22:04,085 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-07-12 06:22:04,086 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-07-12 06:22:04,087 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-07-12 06:22:04,088 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-07-12 06:22:04,089 INFO L181 SettingsManager]: Resetting HornVerifier preferences to default values [2022-07-12 06:22:04,089 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-07-12 06:22:04,090 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-07-12 06:22:04,091 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-07-12 06:22:04,091 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-07-12 06:22:04,093 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-07-12 06:22:04,093 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-07-12 06:22:04,094 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-07-12 06:22:04,094 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-07-12 06:22:04,094 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-07-12 06:22:04,095 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-07-12 06:22:04,095 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-07-12 06:22:04,096 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-07-12 06:22:04,096 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-07-12 06:22:04,097 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-07-12 06:22:04,098 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-07-12 06:22:04,099 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-07-12 06:22:04,099 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-07-12 06:22:04,099 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-07-12 06:22:04,099 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-07-12 06:22:04,100 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-07-12 06:22:04,102 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-07-12 06:22:04,103 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2022-07-12 06:22:04,122 INFO L113 SettingsManager]: Loading preferences was successful [2022-07-12 06:22:04,123 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-07-12 06:22:04,123 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-07-12 06:22:04,123 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-07-12 06:22:04,124 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-07-12 06:22:04,124 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-07-12 06:22:04,124 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-07-12 06:22:04,124 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-07-12 06:22:04,124 INFO L138 SettingsManager]: * Use SBE=true [2022-07-12 06:22:04,125 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-07-12 06:22:04,125 INFO L138 SettingsManager]: * sizeof long=4 [2022-07-12 06:22:04,125 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-07-12 06:22:04,125 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-07-12 06:22:04,125 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-07-12 06:22:04,125 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-07-12 06:22:04,125 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-07-12 06:22:04,126 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-07-12 06:22:04,126 INFO L138 SettingsManager]: * sizeof long double=12 [2022-07-12 06:22:04,126 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-07-12 06:22:04,126 INFO L138 SettingsManager]: * Use constant arrays=true [2022-07-12 06:22:04,126 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-07-12 06:22:04,126 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-07-12 06:22:04,126 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2022-07-12 06:22:04,127 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-07-12 06:22:04,127 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-12 06:22:04,127 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-07-12 06:22:04,127 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-07-12 06:22:04,127 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-07-12 06:22:04,127 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2022-07-12 06:22:04,127 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-07-12 06:22:04,128 INFO L138 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2022-07-12 06:22:04,128 INFO L138 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2022-07-12 06:22:04,128 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-07-12 06:22:04,128 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> bd3dbeb1201d252c8f1e3c61a135802ff8f8ccfcc09353f09b9750e3ee951591 [2022-07-12 06:22:04,284 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-07-12 06:22:04,303 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-07-12 06:22:04,305 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-07-12 06:22:04,305 INFO L271 PluginConnector]: Initializing CDTParser... [2022-07-12 06:22:04,306 INFO L275 PluginConnector]: CDTParser initialized [2022-07-12 06:22:04,307 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive-simple/afterrec-1.c [2022-07-12 06:22:04,360 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/448478d0e/2c2fac07e4d14b8096d9fb0636862759/FLAGe6626e299 [2022-07-12 06:22:04,852 INFO L306 CDTParser]: Found 1 translation units. [2022-07-12 06:22:04,853 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/afterrec-1.c [2022-07-12 06:22:04,859 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/448478d0e/2c2fac07e4d14b8096d9fb0636862759/FLAGe6626e299 [2022-07-12 06:22:05,345 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/448478d0e/2c2fac07e4d14b8096d9fb0636862759 [2022-07-12 06:22:05,352 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-07-12 06:22:05,353 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-07-12 06:22:05,354 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-07-12 06:22:05,355 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-07-12 06:22:05,366 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-07-12 06:22:05,367 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.07 06:22:05" (1/1) ... [2022-07-12 06:22:05,368 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6570dd0a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.07 06:22:05, skipping insertion in model container [2022-07-12 06:22:05,368 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.07 06:22:05" (1/1) ... [2022-07-12 06:22:05,372 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-07-12 06:22:05,389 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-07-12 06:22:05,581 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/afterrec-1.c[318,331] [2022-07-12 06:22:05,586 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-12 06:22:05,593 INFO L203 MainTranslator]: Completed pre-run [2022-07-12 06:22:05,618 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/afterrec-1.c[318,331] [2022-07-12 06:22:05,619 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-07-12 06:22:05,628 INFO L208 MainTranslator]: Completed translation [2022-07-12 06:22:05,629 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.07 06:22:05 WrapperNode [2022-07-12 06:22:05,629 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-07-12 06:22:05,630 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-07-12 06:22:05,630 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-07-12 06:22:05,630 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-07-12 06:22:05,654 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.07 06:22:05" (1/1) ... [2022-07-12 06:22:05,660 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.07 06:22:05" (1/1) ... [2022-07-12 06:22:05,670 INFO L137 Inliner]: procedures = 12, calls = 9, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 11 [2022-07-12 06:22:05,671 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-07-12 06:22:05,672 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-07-12 06:22:05,672 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-07-12 06:22:05,672 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-07-12 06:22:05,677 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.07 06:22:05" (1/1) ... [2022-07-12 06:22:05,677 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.07 06:22:05" (1/1) ... [2022-07-12 06:22:05,679 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.07 06:22:05" (1/1) ... [2022-07-12 06:22:05,680 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.07 06:22:05" (1/1) ... [2022-07-12 06:22:05,682 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.07 06:22:05" (1/1) ... [2022-07-12 06:22:05,683 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.07 06:22:05" (1/1) ... [2022-07-12 06:22:05,685 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.07 06:22:05" (1/1) ... [2022-07-12 06:22:05,689 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-07-12 06:22:05,691 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-07-12 06:22:05,696 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-07-12 06:22:05,696 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-07-12 06:22:05,699 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.07 06:22:05" (1/1) ... [2022-07-12 06:22:05,735 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-07-12 06:22:05,747 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 06:22:05,786 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-07-12 06:22:05,823 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-07-12 06:22:05,841 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-07-12 06:22:05,841 INFO L130 BoogieDeclarations]: Found specification of procedure f [2022-07-12 06:22:05,841 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2022-07-12 06:22:05,842 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-07-12 06:22:05,842 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-07-12 06:22:05,842 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-07-12 06:22:05,900 INFO L234 CfgBuilder]: Building ICFG [2022-07-12 06:22:05,901 INFO L260 CfgBuilder]: Building CFG for each procedure with an implementation [2022-07-12 06:22:06,013 INFO L275 CfgBuilder]: Performing block encoding [2022-07-12 06:22:06,018 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-07-12 06:22:06,019 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2022-07-12 06:22:06,020 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.07 06:22:06 BoogieIcfgContainer [2022-07-12 06:22:06,020 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-07-12 06:22:06,032 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-07-12 06:22:06,034 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-07-12 06:22:06,049 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-07-12 06:22:06,054 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.07 06:22:05" (1/3) ... [2022-07-12 06:22:06,055 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@225c58d3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.07 06:22:06, skipping insertion in model container [2022-07-12 06:22:06,055 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.07 06:22:05" (2/3) ... [2022-07-12 06:22:06,055 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@225c58d3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.07 06:22:06, skipping insertion in model container [2022-07-12 06:22:06,055 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.07 06:22:06" (3/3) ... [2022-07-12 06:22:06,056 INFO L111 eAbstractionObserver]: Analyzing ICFG afterrec-1.c [2022-07-12 06:22:06,082 INFO L201 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-07-12 06:22:06,082 INFO L160 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-07-12 06:22:06,178 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-07-12 06:22:06,183 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@8ba29a4, mLbeIndependenceSettings=de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings@25840051 [2022-07-12 06:22:06,184 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-07-12 06:22:06,187 INFO L276 IsEmpty]: Start isEmpty. Operand has 13 states, 8 states have (on average 1.25) internal successors, (10), 9 states have internal predecessors, (10), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-07-12 06:22:06,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-07-12 06:22:06,211 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 06:22:06,211 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 06:22:06,212 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting fErr0ASSERT_VIOLATIONERROR_FUNCTION === [fErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-12 06:22:06,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 06:22:06,218 INFO L85 PathProgramCache]: Analyzing trace with hash 1036188702, now seen corresponding path program 1 times [2022-07-12 06:22:06,248 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 06:22:06,249 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2042275915] [2022-07-12 06:22:06,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 06:22:06,250 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 06:22:06,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 06:22:06,487 INFO L376 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2022-07-12 06:22:06,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 06:22:06,541 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 06:22:06,551 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2022-07-12 06:22:06,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2042275915] [2022-07-12 06:22:06,553 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2042275915] provided 0 perfect and 1 imperfect interpolant sequences [2022-07-12 06:22:06,553 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [780504408] [2022-07-12 06:22:06,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 06:22:06,553 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-07-12 06:22:06,553 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2022-07-12 06:22:06,567 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-07-12 06:22:06,634 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-07-12 06:22:06,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-07-12 06:22:06,647 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 6 conjunts are in the unsatisfiable core [2022-07-12 06:22:06,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-07-12 06:22:06,744 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 06:22:06,744 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-07-12 06:22:06,902 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-07-12 06:22:06,903 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [780504408] provided 0 perfect and 2 imperfect interpolant sequences [2022-07-12 06:22:06,903 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-07-12 06:22:06,903 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 9 [2022-07-12 06:22:06,905 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [521647708] [2022-07-12 06:22:06,906 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-07-12 06:22:06,909 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-07-12 06:22:06,909 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2022-07-12 06:22:06,963 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-07-12 06:22:06,964 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2022-07-12 06:22:06,965 INFO L87 Difference]: Start difference. First operand has 13 states, 8 states have (on average 1.25) internal successors, (10), 9 states have internal predecessors, (10), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 9 states, 8 states have (on average 1.5) internal successors, (12), 8 states have internal predecessors, (12), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-07-12 06:22:07,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-07-12 06:22:07,077 INFO L93 Difference]: Finished difference Result 20 states and 24 transitions. [2022-07-12 06:22:07,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-07-12 06:22:07,087 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 1.5) internal successors, (12), 8 states have internal predecessors, (12), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2022-07-12 06:22:07,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-07-12 06:22:07,095 INFO L225 Difference]: With dead ends: 20 [2022-07-12 06:22:07,095 INFO L226 Difference]: Without dead ends: 13 [2022-07-12 06:22:07,101 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2022-07-12 06:22:07,121 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 3 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-07-12 06:22:07,122 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 24 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-07-12 06:22:07,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2022-07-12 06:22:07,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2022-07-12 06:22:07,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 8 states have (on average 1.125) internal successors, (9), 9 states have internal predecessors, (9), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-07-12 06:22:07,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2022-07-12 06:22:07,163 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2022-07-12 06:22:07,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-07-12 06:22:07,164 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2022-07-12 06:22:07,164 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 1.5) internal successors, (12), 8 states have internal predecessors, (12), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-07-12 06:22:07,165 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2022-07-12 06:22:07,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-07-12 06:22:07,165 INFO L187 NwaCegarLoop]: Found error trace [2022-07-12 06:22:07,165 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-07-12 06:22:07,202 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-07-12 06:22:07,383 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2022-07-12 06:22:07,383 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting fErr0ASSERT_VIOLATIONERROR_FUNCTION === [fErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-07-12 06:22:07,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-07-12 06:22:07,384 INFO L85 PathProgramCache]: Analyzing trace with hash -2027498805, now seen corresponding path program 2 times [2022-07-12 06:22:07,384 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2022-07-12 06:22:07,384 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1407142592] [2022-07-12 06:22:07,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-07-12 06:22:07,384 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-07-12 06:22:07,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-07-12 06:22:07,395 INFO L352 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-07-12 06:22:07,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-07-12 06:22:07,441 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2022-07-12 06:22:07,442 INFO L271 BasicCegarLoop]: Counterexample is feasible [2022-07-12 06:22:07,452 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location fErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2022-07-12 06:22:07,454 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-07-12 06:22:07,460 INFO L356 BasicCegarLoop]: Path program histogram: [2] [2022-07-12 06:22:07,463 INFO L176 ceAbstractionStarter]: Computing trace abstraction results [2022-07-12 06:22:07,486 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 12.07 06:22:07 BoogieIcfgContainer [2022-07-12 06:22:07,486 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2022-07-12 06:22:07,486 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2022-07-12 06:22:07,487 INFO L271 PluginConnector]: Initializing Witness Printer... [2022-07-12 06:22:07,487 INFO L275 PluginConnector]: Witness Printer initialized [2022-07-12 06:22:07,489 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.07 06:22:06" (3/4) ... [2022-07-12 06:22:07,491 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2022-07-12 06:22:07,559 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2022-07-12 06:22:07,559 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2022-07-12 06:22:07,562 INFO L158 Benchmark]: Toolchain (without parser) took 2208.41ms. Allocated memory is still 117.4MB. Free memory was 86.7MB in the beginning and 84.3MB in the end (delta: 2.5MB). Peak memory consumption was 3.3MB. Max. memory is 16.1GB. [2022-07-12 06:22:07,562 INFO L158 Benchmark]: CDTParser took 0.09ms. Allocated memory is still 81.8MB. Free memory was 45.3MB in the beginning and 45.2MB in the end (delta: 42.8kB). There was no memory consumed. Max. memory is 16.1GB. [2022-07-12 06:22:07,564 INFO L158 Benchmark]: CACSL2BoogieTranslator took 275.03ms. Allocated memory is still 117.4MB. Free memory was 86.5MB in the beginning and 94.9MB in the end (delta: -8.4MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. [2022-07-12 06:22:07,564 INFO L158 Benchmark]: Boogie Procedure Inliner took 40.84ms. Allocated memory is still 117.4MB. Free memory was 94.9MB in the beginning and 93.2MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2022-07-12 06:22:07,565 INFO L158 Benchmark]: Boogie Preprocessor took 17.83ms. Allocated memory is still 117.4MB. Free memory was 93.2MB in the beginning and 92.7MB in the end (delta: 577.9kB). There was no memory consumed. Max. memory is 16.1GB. [2022-07-12 06:22:07,565 INFO L158 Benchmark]: RCFGBuilder took 329.59ms. Allocated memory is still 117.4MB. Free memory was 92.7MB in the beginning and 83.8MB in the end (delta: 8.9MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2022-07-12 06:22:07,565 INFO L158 Benchmark]: TraceAbstraction took 1453.61ms. Allocated memory is still 117.4MB. Free memory was 83.3MB in the beginning and 85.7MB in the end (delta: -2.4MB). There was no memory consumed. Max. memory is 16.1GB. [2022-07-12 06:22:07,565 INFO L158 Benchmark]: Witness Printer took 74.81ms. Allocated memory is still 117.4MB. Free memory was 85.7MB in the beginning and 84.3MB in the end (delta: 1.5MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2022-07-12 06:22:07,582 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.09ms. Allocated memory is still 81.8MB. Free memory was 45.3MB in the beginning and 45.2MB in the end (delta: 42.8kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 275.03ms. Allocated memory is still 117.4MB. Free memory was 86.5MB in the beginning and 94.9MB in the end (delta: -8.4MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 40.84ms. Allocated memory is still 117.4MB. Free memory was 94.9MB in the beginning and 93.2MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 17.83ms. Allocated memory is still 117.4MB. Free memory was 93.2MB in the beginning and 92.7MB in the end (delta: 577.9kB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 329.59ms. Allocated memory is still 117.4MB. Free memory was 92.7MB in the beginning and 83.8MB in the end (delta: 8.9MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * TraceAbstraction took 1453.61ms. Allocated memory is still 117.4MB. Free memory was 83.3MB in the beginning and 85.7MB in the end (delta: -2.4MB). There was no memory consumed. Max. memory is 16.1GB. * Witness Printer took 74.81ms. Allocated memory is still 117.4MB. Free memory was 85.7MB in the beginning and 84.3MB in the end (delta: 1.5MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 9]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L13] CALL f(4) VAL [\old(n)=4] [L6] COND FALSE !(n<3) [L7] n-- VAL [\old(n)=4, n=3] [L8] CALL f(n) VAL [\old(n)=3] [L6] COND FALSE !(n<3) [L7] n-- VAL [\old(n)=3, n=2] [L8] CALL f(n) VAL [\old(n)=2] [L6] COND TRUE n<3 VAL [\old(n)=2, n=2] [L8] RET f(n) VAL [\old(n)=3, n=2] [L9] reach_error() VAL [\old(n)=3, n=2] - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 13 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 1.3s, OverallIterations: 2, TraceHistogramMax: 3, PathProgramHistogramMax: 2, EmptinessCheckTime: 0.0s, AutomataDifference: 0.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 3 SdHoareTripleChecker+Valid, 0.0s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 3 mSDsluCounter, 24 SdHoareTripleChecker+Invalid, 0.0s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 18 mSDsCounter, 4 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 29 IncrementalHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 4 mSolverCounterUnsat, 6 mSDtfsCounter, 29 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 31 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=13occurred in iteration=0, InterpolantAutomatonStates: 7, 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, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.5s InterpolantComputationTime, 36 NumberOfCodeBlocks, 36 NumberOfCodeBlocksAsserted, 3 NumberOfCheckSat, 30 ConstructedInterpolants, 0 QuantifiedInterpolants, 71 SizeOfPredicates, 2 NumberOfNonLiveVariables, 45 ConjunctsInSsa, 6 ConjunctsInUnsatCore, 3 InterpolantComputations, 0 PerfectInterpolantSequences, 0/6 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! [2022-07-12 06:22:07,629 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE