./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/count_down_unsafe.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 7b2dab56 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_7f63ab05-5b1e-4104-b725-11c50e09dcd9/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_7f63ab05-5b1e-4104-b725-11c50e09dcd9/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_7f63ab05-5b1e-4104-b725-11c50e09dcd9/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_7f63ab05-5b1e-4104-b725-11c50e09dcd9/bin/utaipan/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/count_down_unsafe.i -s /tmp/vcloud-vcloud-master/worker/run_dir_7f63ab05-5b1e-4104-b725-11c50e09dcd9/bin/utaipan/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_7f63ab05-5b1e-4104-b725-11c50e09dcd9/bin/utaipan --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 744113fc2ef40828e0832f07c1176e726449b166 ................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE(valid-deref) --- Real Ultimate output --- This is Ultimate 0.2.0-7b2dab5 [2020-12-09 10:34:48,206 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-09 10:34:48,208 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-09 10:34:48,246 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-09 10:34:48,246 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-09 10:34:48,248 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-09 10:34:48,249 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-09 10:34:48,251 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-09 10:34:48,253 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-09 10:34:48,255 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-09 10:34:48,256 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-09 10:34:48,257 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-09 10:34:48,257 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-09 10:34:48,258 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-09 10:34:48,260 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-09 10:34:48,261 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-09 10:34:48,262 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-09 10:34:48,263 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-09 10:34:48,265 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-09 10:34:48,267 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-09 10:34:48,269 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-09 10:34:48,270 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-09 10:34:48,271 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-09 10:34:48,272 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-09 10:34:48,275 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-12-09 10:34:48,276 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-12-09 10:34:48,276 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-12-09 10:34:48,277 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-12-09 10:34:48,278 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-12-09 10:34:48,279 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-12-09 10:34:48,279 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-09 10:34:48,280 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-09 10:34:48,281 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-09 10:34:48,282 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-09 10:34:48,283 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-09 10:34:48,284 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-09 10:34:48,284 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-09 10:34:48,285 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-09 10:34:48,285 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-09 10:34:48,286 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-09 10:34:48,287 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-09 10:34:48,287 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_7f63ab05-5b1e-4104-b725-11c50e09dcd9/bin/utaipan/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2020-12-09 10:34:48,310 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-09 10:34:48,310 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-09 10:34:48,311 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-12-09 10:34:48,311 INFO L138 SettingsManager]: * User list type=DISABLED [2020-12-09 10:34:48,311 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-12-09 10:34:48,311 INFO L138 SettingsManager]: * Explicit value domain=true [2020-12-09 10:34:48,311 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-12-09 10:34:48,311 INFO L138 SettingsManager]: * Octagon Domain=false [2020-12-09 10:34:48,312 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-12-09 10:34:48,312 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-12-09 10:34:48,312 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-12-09 10:34:48,312 INFO L138 SettingsManager]: * Interval Domain=false [2020-12-09 10:34:48,312 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-12-09 10:34:48,312 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-12-09 10:34:48,313 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-12-09 10:34:48,313 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-09 10:34:48,313 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-09 10:34:48,314 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-09 10:34:48,314 INFO L138 SettingsManager]: * sizeof long=4 [2020-12-09 10:34:48,314 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2020-12-09 10:34:48,314 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-09 10:34:48,314 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-12-09 10:34:48,314 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-09 10:34:48,315 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2020-12-09 10:34:48,315 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2020-12-09 10:34:48,315 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2020-12-09 10:34:48,315 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-09 10:34:48,315 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-12-09 10:34:48,315 INFO L138 SettingsManager]: * sizeof long double=12 [2020-12-09 10:34:48,316 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-09 10:34:48,316 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-09 10:34:48,316 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-09 10:34:48,316 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-09 10:34:48,316 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-09 10:34:48,317 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-09 10:34:48,317 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-12-09 10:34:48,317 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-09 10:34:48,317 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-09 10:34:48,317 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-12-09 10:34:48,317 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_7f63ab05-5b1e-4104-b725-11c50e09dcd9/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_7f63ab05-5b1e-4104-b725-11c50e09dcd9/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 744113fc2ef40828e0832f07c1176e726449b166 [2020-12-09 10:34:48,494 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-09 10:34:48,512 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-09 10:34:48,514 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-09 10:34:48,515 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-09 10:34:48,515 INFO L275 PluginConnector]: CDTParser initialized [2020-12-09 10:34:48,516 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_7f63ab05-5b1e-4104-b725-11c50e09dcd9/bin/utaipan/../../sv-benchmarks/c/array-memsafety/count_down_unsafe.i [2020-12-09 10:34:48,557 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_7f63ab05-5b1e-4104-b725-11c50e09dcd9/bin/utaipan/data/9a5fe0343/73cfbe4cd47245d3afa6852d750ed82e/FLAGf2ab74bd1 [2020-12-09 10:34:48,993 INFO L306 CDTParser]: Found 1 translation units. [2020-12-09 10:34:48,993 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_7f63ab05-5b1e-4104-b725-11c50e09dcd9/sv-benchmarks/c/array-memsafety/count_down_unsafe.i [2020-12-09 10:34:49,005 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_7f63ab05-5b1e-4104-b725-11c50e09dcd9/bin/utaipan/data/9a5fe0343/73cfbe4cd47245d3afa6852d750ed82e/FLAGf2ab74bd1 [2020-12-09 10:34:49,017 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_7f63ab05-5b1e-4104-b725-11c50e09dcd9/bin/utaipan/data/9a5fe0343/73cfbe4cd47245d3afa6852d750ed82e [2020-12-09 10:34:49,019 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-09 10:34:49,021 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-09 10:34:49,022 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-09 10:34:49,022 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-09 10:34:49,025 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-09 10:34:49,025 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 10:34:49" (1/1) ... [2020-12-09 10:34:49,026 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6f3b37da and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 10:34:49, skipping insertion in model container [2020-12-09 10:34:49,027 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 10:34:49" (1/1) ... [2020-12-09 10:34:49,033 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-09 10:34:49,065 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-09 10:34:49,232 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 10:34:49,238 INFO L203 MainTranslator]: Completed pre-run [2020-12-09 10:34:49,265 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 10:34:49,299 INFO L208 MainTranslator]: Completed translation [2020-12-09 10:34:49,299 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 10:34:49 WrapperNode [2020-12-09 10:34:49,299 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-09 10:34:49,300 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-09 10:34:49,300 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-09 10:34:49,300 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-09 10:34:49,305 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 10:34:49" (1/1) ... [2020-12-09 10:34:49,317 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 10:34:49" (1/1) ... [2020-12-09 10:34:49,332 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-09 10:34:49,333 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-09 10:34:49,333 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-09 10:34:49,333 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-09 10:34:49,339 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 10:34:49" (1/1) ... [2020-12-09 10:34:49,339 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 10:34:49" (1/1) ... [2020-12-09 10:34:49,342 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 10:34:49" (1/1) ... [2020-12-09 10:34:49,342 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 10:34:49" (1/1) ... [2020-12-09 10:34:49,348 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 10:34:49" (1/1) ... [2020-12-09 10:34:49,351 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 10:34:49" (1/1) ... [2020-12-09 10:34:49,353 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 10:34:49" (1/1) ... [2020-12-09 10:34:49,355 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-09 10:34:49,356 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-09 10:34:49,356 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-09 10:34:49,356 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-09 10:34:49,357 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 10:34:49" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_7f63ab05-5b1e-4104-b725-11c50e09dcd9/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 [2020-12-09 10:34:49,409 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-09 10:34:49,409 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-09 10:34:49,410 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-09 10:34:49,410 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-09 10:34:49,410 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-09 10:34:49,410 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-09 10:34:49,707 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-09 10:34:49,708 INFO L299 CfgBuilder]: Removed 7 assume(true) statements. [2020-12-09 10:34:49,710 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 10:34:49 BoogieIcfgContainer [2020-12-09 10:34:49,710 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-09 10:34:49,712 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-09 10:34:49,712 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-09 10:34:49,715 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-09 10:34:49,715 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.12 10:34:49" (1/3) ... [2020-12-09 10:34:49,716 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4123d028 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 10:34:49, skipping insertion in model container [2020-12-09 10:34:49,716 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 10:34:49" (2/3) ... [2020-12-09 10:34:49,717 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4123d028 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 10:34:49, skipping insertion in model container [2020-12-09 10:34:49,717 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 10:34:49" (3/3) ... [2020-12-09 10:34:49,718 INFO L111 eAbstractionObserver]: Analyzing ICFG count_down_unsafe.i [2020-12-09 10:34:49,728 INFO L180 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-09 10:34:49,731 INFO L192 ceAbstractionStarter]: Appying trace abstraction to program that has 9 error locations. [2020-12-09 10:34:49,738 INFO L253 AbstractCegarLoop]: Starting to check reachability of 9 error locations. [2020-12-09 10:34:49,755 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-09 10:34:49,755 INFO L378 AbstractCegarLoop]: Hoare is false [2020-12-09 10:34:49,755 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-09 10:34:49,755 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-09 10:34:49,755 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-09 10:34:49,755 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-09 10:34:49,755 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-09 10:34:49,755 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-09 10:34:49,765 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-12-09 10:34:49,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2020-12-09 10:34:49,770 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 10:34:49,771 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1] [2020-12-09 10:34:49,771 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr7REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr6REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr8ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 10:34:49,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 10:34:49,776 INFO L82 PathProgramCache]: Analyzing trace with hash 111923, now seen corresponding path program 1 times [2020-12-09 10:34:49,782 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 10:34:49,782 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1888387172] [2020-12-09 10:34:49,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 10:34:49,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 10:34:49,905 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 10:34:49,906 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1888387172] [2020-12-09 10:34:49,906 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 10:34:49,907 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-12-09 10:34:49,907 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [340873381] [2020-12-09 10:34:49,911 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-09 10:34:49,911 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 10:34:49,924 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-09 10:34:49,925 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-09 10:34:49,926 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 3 states. [2020-12-09 10:34:49,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 10:34:49,964 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2020-12-09 10:34:49,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-09 10:34:49,965 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2020-12-09 10:34:49,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 10:34:49,973 INFO L225 Difference]: With dead ends: 21 [2020-12-09 10:34:49,973 INFO L226 Difference]: Without dead ends: 20 [2020-12-09 10:34:49,975 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-09 10:34:49,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-12-09 10:34:50,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-12-09 10:34:50,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-12-09 10:34:50,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-12-09 10:34:50,003 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 3 [2020-12-09 10:34:50,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 10:34:50,004 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-12-09 10:34:50,004 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-09 10:34:50,004 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-12-09 10:34:50,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2020-12-09 10:34:50,004 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 10:34:50,004 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2020-12-09 10:34:50,005 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-09 10:34:50,005 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr7REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr6REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr8ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 10:34:50,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 10:34:50,006 INFO L82 PathProgramCache]: Analyzing trace with hash 3471937, now seen corresponding path program 1 times [2020-12-09 10:34:50,009 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 10:34:50,009 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1066826800] [2020-12-09 10:34:50,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 10:34:50,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 10:34:50,031 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 10:34:50,032 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1066826800] [2020-12-09 10:34:50,032 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 10:34:50,032 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2020-12-09 10:34:50,036 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [621091997] [2020-12-09 10:34:50,036 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-09 10:34:50,037 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 10:34:50,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-09 10:34:50,038 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-09 10:34:50,038 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 3 states. [2020-12-09 10:34:50,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 10:34:50,055 INFO L93 Difference]: Finished difference Result 16 states and 18 transitions. [2020-12-09 10:34:50,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-09 10:34:50,055 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2020-12-09 10:34:50,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 10:34:50,056 INFO L225 Difference]: With dead ends: 16 [2020-12-09 10:34:50,056 INFO L226 Difference]: Without dead ends: 16 [2020-12-09 10:34:50,057 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-09 10:34:50,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-12-09 10:34:50,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-12-09 10:34:50,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-12-09 10:34:50,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-12-09 10:34:50,060 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 4 [2020-12-09 10:34:50,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 10:34:50,060 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-12-09 10:34:50,060 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-09 10:34:50,061 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-12-09 10:34:50,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2020-12-09 10:34:50,061 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 10:34:50,061 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2020-12-09 10:34:50,061 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-12-09 10:34:50,062 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr7REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr6REQUIRES_VIOLATION, ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr5REQUIRES_VIOLATION, ULTIMATE.startErr8ASSERT_VIOLATIONMEMORY_LEAK, ULTIMATE.startErr4REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION]=== [2020-12-09 10:34:50,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 10:34:50,062 INFO L82 PathProgramCache]: Analyzing trace with hash 3471938, now seen corresponding path program 1 times [2020-12-09 10:34:50,062 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 10:34:50,063 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1383346681] [2020-12-09 10:34:50,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 10:34:50,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-09 10:34:50,085 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-09 10:34:50,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-09 10:34:50,097 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-09 10:34:50,110 INFO L173 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2020-12-09 10:34:50,110 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-12-09 10:34:50,110 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-12-09 10:34:50,122 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 09.12 10:34:50 BoogieIcfgContainer [2020-12-09 10:34:50,122 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-09 10:34:50,123 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-09 10:34:50,123 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-09 10:34:50,123 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-09 10:34:50,123 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 10:34:49" (3/4) ... [2020-12-09 10:34:50,125 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-12-09 10:34:50,149 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_7f63ab05-5b1e-4104-b725-11c50e09dcd9/bin/utaipan/witness.graphml [2020-12-09 10:34:50,149 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-09 10:34:50,150 INFO L168 Benchmark]: Toolchain (without parser) took 1128.55 ms. Allocated memory is still 94.4 MB. Free memory was 53.8 MB in the beginning and 62.7 MB in the end (delta: -8.9 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 10:34:50,150 INFO L168 Benchmark]: CDTParser took 0.12 ms. Allocated memory is still 94.4 MB. Free memory is still 71.1 MB. There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 10:34:50,151 INFO L168 Benchmark]: CACSL2BoogieTranslator took 277.15 ms. Allocated memory is still 94.4 MB. Free memory was 53.5 MB in the beginning and 57.5 MB in the end (delta: -4.0 MB). Peak memory consumption was 7.3 MB. Max. memory is 16.1 GB. [2020-12-09 10:34:50,151 INFO L168 Benchmark]: Boogie Procedure Inliner took 32.08 ms. Allocated memory is still 94.4 MB. Free memory was 57.5 MB in the beginning and 55.6 MB in the end (delta: 1.9 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-09 10:34:50,152 INFO L168 Benchmark]: Boogie Preprocessor took 22.21 ms. Allocated memory is still 94.4 MB. Free memory was 55.6 MB in the beginning and 54.7 MB in the end (delta: 993.7 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-09 10:34:50,152 INFO L168 Benchmark]: RCFGBuilder took 354.12 ms. Allocated memory is still 94.4 MB. Free memory was 54.3 MB in the beginning and 55.6 MB in the end (delta: -1.3 MB). Peak memory consumption was 12.3 MB. Max. memory is 16.1 GB. [2020-12-09 10:34:50,153 INFO L168 Benchmark]: TraceAbstraction took 410.72 ms. Allocated memory is still 94.4 MB. Free memory was 55.1 MB in the beginning and 64.1 MB in the end (delta: -9.1 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 10:34:50,153 INFO L168 Benchmark]: Witness Printer took 26.05 ms. Allocated memory is still 94.4 MB. Free memory was 64.1 MB in the beginning and 62.7 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-09 10:34:50,155 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.12 ms. Allocated memory is still 94.4 MB. Free memory is still 71.1 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 277.15 ms. Allocated memory is still 94.4 MB. Free memory was 53.5 MB in the beginning and 57.5 MB in the end (delta: -4.0 MB). Peak memory consumption was 7.3 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 32.08 ms. Allocated memory is still 94.4 MB. Free memory was 57.5 MB in the beginning and 55.6 MB in the end (delta: 1.9 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 22.21 ms. Allocated memory is still 94.4 MB. Free memory was 55.6 MB in the beginning and 54.7 MB in the end (delta: 993.7 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 354.12 ms. Allocated memory is still 94.4 MB. Free memory was 54.3 MB in the beginning and 55.6 MB in the end (delta: -1.3 MB). Peak memory consumption was 12.3 MB. Max. memory is 16.1 GB. * TraceAbstraction took 410.72 ms. Allocated memory is still 94.4 MB. Free memory was 55.1 MB in the beginning and 64.1 MB in the end (delta: -9.1 MB). There was no memory consumed. Max. memory is 16.1 GB. * Witness Printer took 26.05 ms. Allocated memory is still 94.4 MB. Free memory was 64.1 MB in the beginning and 62.7 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 524]: pointer dereference may fail pointer dereference may fail We found a FailurePath: [L513] int i, j; [L514] int val; [L515] int length = __VERIFIER_nondet_int(); [L516] COND FALSE !(length < 1) [L517] int *arr = __builtin_alloca (length); [L518] COND FALSE !(!arr) [L519] i=0 [L519] COND TRUE i