./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 a4ecdabc Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_dce46159-3919-43b6-ac67-510f673f3f09/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_dce46159-3919-43b6-ac67-510f673f3f09/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_dce46159-3919-43b6-ac67-510f673f3f09/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_dce46159-3919-43b6-ac67-510f673f3f09/bin/utaipan/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/count_down_unsafe.i -s /tmp/vcloud-vcloud-master/worker/run_dir_dce46159-3919-43b6-ac67-510f673f3f09/bin/utaipan/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_dce46159-3919-43b6-ac67-510f673f3f09/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-a4ecdab [2020-11-28 07:41:22,339 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-28 07:41:22,341 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-28 07:41:22,395 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-28 07:41:22,396 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-28 07:41:22,413 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-28 07:41:22,416 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-28 07:41:22,423 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-28 07:41:22,425 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-28 07:41:22,426 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-28 07:41:22,428 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-28 07:41:22,429 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-28 07:41:22,429 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-28 07:41:22,432 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-28 07:41:22,434 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-28 07:41:22,437 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-28 07:41:22,438 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-28 07:41:22,443 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-28 07:41:22,450 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-28 07:41:22,457 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-28 07:41:22,460 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-28 07:41:22,462 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-28 07:41:22,464 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-28 07:41:22,465 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-28 07:41:22,468 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-28 07:41:22,469 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-28 07:41:22,469 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-28 07:41:22,471 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-28 07:41:22,471 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-28 07:41:22,472 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-28 07:41:22,473 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-28 07:41:22,474 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-28 07:41:22,476 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-28 07:41:22,477 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-28 07:41:22,478 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-28 07:41:22,478 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-28 07:41:22,479 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-28 07:41:22,479 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-28 07:41:22,479 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-28 07:41:22,480 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-28 07:41:22,482 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-28 07:41:22,484 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_dce46159-3919-43b6-ac67-510f673f3f09/bin/utaipan/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2020-11-28 07:41:22,526 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-28 07:41:22,526 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-28 07:41:22,527 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-11-28 07:41:22,527 INFO L138 SettingsManager]: * User list type=DISABLED [2020-11-28 07:41:22,528 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-11-28 07:41:22,528 INFO L138 SettingsManager]: * Explicit value domain=true [2020-11-28 07:41:22,528 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-11-28 07:41:22,528 INFO L138 SettingsManager]: * Octagon Domain=false [2020-11-28 07:41:22,528 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-11-28 07:41:22,528 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-11-28 07:41:22,529 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-11-28 07:41:22,530 INFO L138 SettingsManager]: * Interval Domain=false [2020-11-28 07:41:22,530 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-11-28 07:41:22,530 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-11-28 07:41:22,530 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-11-28 07:41:22,531 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-11-28 07:41:22,531 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-11-28 07:41:22,531 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-28 07:41:22,532 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-28 07:41:22,532 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2020-11-28 07:41:22,532 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-28 07:41:22,532 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-28 07:41:22,532 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-28 07:41:22,532 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2020-11-28 07:41:22,533 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2020-11-28 07:41:22,533 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2020-11-28 07:41:22,534 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-28 07:41:22,534 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-11-28 07:41:22,535 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-28 07:41:22,535 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-28 07:41:22,535 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-28 07:41:22,535 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-28 07:41:22,536 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-28 07:41:22,536 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-28 07:41:22,536 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-28 07:41:22,536 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-28 07:41:22,536 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-11-28 07:41:22,537 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-28 07:41:22,537 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-28 07:41:22,537 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-11-28 07:41:22,537 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_dce46159-3919-43b6-ac67-510f673f3f09/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_dce46159-3919-43b6-ac67-510f673f3f09/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 744113fc2ef40828e0832f07c1176e726449b166 [2020-11-28 07:41:22,813 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-28 07:41:22,849 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-28 07:41:22,852 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-28 07:41:22,853 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-28 07:41:22,855 INFO L275 PluginConnector]: CDTParser initialized [2020-11-28 07:41:22,856 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_dce46159-3919-43b6-ac67-510f673f3f09/bin/utaipan/../../sv-benchmarks/c/array-memsafety/count_down_unsafe.i [2020-11-28 07:41:22,933 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_dce46159-3919-43b6-ac67-510f673f3f09/bin/utaipan/data/9850b41d9/64cc6be840ea48b99e2dd54fadb25477/FLAGf47c1a223 [2020-11-28 07:41:23,435 INFO L306 CDTParser]: Found 1 translation units. [2020-11-28 07:41:23,440 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_dce46159-3919-43b6-ac67-510f673f3f09/sv-benchmarks/c/array-memsafety/count_down_unsafe.i [2020-11-28 07:41:23,460 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_dce46159-3919-43b6-ac67-510f673f3f09/bin/utaipan/data/9850b41d9/64cc6be840ea48b99e2dd54fadb25477/FLAGf47c1a223 [2020-11-28 07:41:23,753 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_dce46159-3919-43b6-ac67-510f673f3f09/bin/utaipan/data/9850b41d9/64cc6be840ea48b99e2dd54fadb25477 [2020-11-28 07:41:23,756 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-28 07:41:23,759 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-28 07:41:23,763 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-28 07:41:23,764 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-28 07:41:23,768 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-28 07:41:23,769 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 07:41:23" (1/1) ... [2020-11-28 07:41:23,772 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@76f1fc67 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:41:23, skipping insertion in model container [2020-11-28 07:41:23,772 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 07:41:23" (1/1) ... [2020-11-28 07:41:23,779 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-28 07:41:23,836 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-28 07:41:24,192 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-28 07:41:24,202 INFO L203 MainTranslator]: Completed pre-run [2020-11-28 07:41:24,266 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-28 07:41:24,319 INFO L208 MainTranslator]: Completed translation [2020-11-28 07:41:24,320 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:41:24 WrapperNode [2020-11-28 07:41:24,320 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-28 07:41:24,321 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-28 07:41:24,321 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-28 07:41:24,321 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-28 07:41:24,330 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:41:24" (1/1) ... [2020-11-28 07:41:24,354 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:41:24" (1/1) ... [2020-11-28 07:41:24,370 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-28 07:41:24,371 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-28 07:41:24,371 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-28 07:41:24,371 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-28 07:41:24,379 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:41:24" (1/1) ... [2020-11-28 07:41:24,379 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:41:24" (1/1) ... [2020-11-28 07:41:24,382 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:41:24" (1/1) ... [2020-11-28 07:41:24,383 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:41:24" (1/1) ... [2020-11-28 07:41:24,388 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:41:24" (1/1) ... [2020-11-28 07:41:24,392 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:41:24" (1/1) ... [2020-11-28 07:41:24,394 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:41:24" (1/1) ... [2020-11-28 07:41:24,396 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-28 07:41:24,397 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-28 07:41:24,398 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-28 07:41:24,398 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-28 07:41:24,399 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:41:24" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_dce46159-3919-43b6-ac67-510f673f3f09/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 07:41:24,469 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-11-28 07:41:24,469 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-11-28 07:41:24,470 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-28 07:41:24,470 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-28 07:41:24,470 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-28 07:41:24,470 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-28 07:41:25,000 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-28 07:41:25,000 INFO L298 CfgBuilder]: Removed 7 assume(true) statements. [2020-11-28 07:41:25,002 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 07:41:25 BoogieIcfgContainer [2020-11-28 07:41:25,002 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-28 07:41:25,004 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-28 07:41:25,004 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-28 07:41:25,007 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-28 07:41:25,008 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 28.11 07:41:23" (1/3) ... [2020-11-28 07:41:25,009 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@274a2817 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 07:41:25, skipping insertion in model container [2020-11-28 07:41:25,009 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 07:41:24" (2/3) ... [2020-11-28 07:41:25,009 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@274a2817 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 07:41:25, skipping insertion in model container [2020-11-28 07:41:25,009 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 07:41:25" (3/3) ... [2020-11-28 07:41:25,010 INFO L111 eAbstractionObserver]: Analyzing ICFG count_down_unsafe.i [2020-11-28 07:41:25,021 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-28 07:41:25,026 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 9 error locations. [2020-11-28 07:41:25,038 INFO L253 AbstractCegarLoop]: Starting to check reachability of 9 error locations. [2020-11-28 07:41:25,059 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-28 07:41:25,059 INFO L378 AbstractCegarLoop]: Hoare is false [2020-11-28 07:41:25,059 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-28 07:41:25,059 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-28 07:41:25,059 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-28 07:41:25,060 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-28 07:41:25,060 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-28 07:41:25,060 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-28 07:41:25,072 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-11-28 07:41:25,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2020-11-28 07:41:25,078 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:41:25,079 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1] [2020-11-28 07:41:25,079 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]=== [2020-11-28 07:41:25,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:41:25,085 INFO L82 PathProgramCache]: Analyzing trace with hash 111923, now seen corresponding path program 1 times [2020-11-28 07:41:25,094 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:41:25,095 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1337913076] [2020-11-28 07:41:25,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:41:25,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:41:25,293 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 07:41:25,294 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1337913076] [2020-11-28 07:41:25,295 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 07:41:25,295 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-11-28 07:41:25,298 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1340343504] [2020-11-28 07:41:25,302 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-28 07:41:25,303 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:41:25,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-28 07:41:25,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-28 07:41:25,324 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 3 states. [2020-11-28 07:41:25,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:41:25,390 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2020-11-28 07:41:25,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-28 07:41:25,393 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 3 [2020-11-28 07:41:25,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:41:25,399 INFO L225 Difference]: With dead ends: 21 [2020-11-28 07:41:25,399 INFO L226 Difference]: Without dead ends: 20 [2020-11-28 07:41:25,400 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 [2020-11-28 07:41:25,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-11-28 07:41:25,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-11-28 07:41:25,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-11-28 07:41:25,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-11-28 07:41:25,428 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 3 [2020-11-28 07:41:25,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:41:25,429 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-11-28 07:41:25,429 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-28 07:41:25,430 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-11-28 07:41:25,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2020-11-28 07:41:25,430 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:41:25,430 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2020-11-28 07:41:25,431 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-28 07:41:25,431 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]=== [2020-11-28 07:41:25,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:41:25,436 INFO L82 PathProgramCache]: Analyzing trace with hash 3471937, now seen corresponding path program 1 times [2020-11-28 07:41:25,436 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:41:25,436 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [480584614] [2020-11-28 07:41:25,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:41:25,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 07:41:25,480 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 07:41:25,481 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [480584614] [2020-11-28 07:41:25,481 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 07:41:25,481 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2020-11-28 07:41:25,481 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [423450412] [2020-11-28 07:41:25,482 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-28 07:41:25,482 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-28 07:41:25,483 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-28 07:41:25,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-28 07:41:25,483 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 3 states. [2020-11-28 07:41:25,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 07:41:25,577 INFO L93 Difference]: Finished difference Result 16 states and 18 transitions. [2020-11-28 07:41:25,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-28 07:41:25,578 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2020-11-28 07:41:25,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 07:41:25,579 INFO L225 Difference]: With dead ends: 16 [2020-11-28 07:41:25,579 INFO L226 Difference]: Without dead ends: 16 [2020-11-28 07:41:25,579 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 [2020-11-28 07:41:25,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-11-28 07:41:25,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-11-28 07:41:25,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-11-28 07:41:25,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-11-28 07:41:25,583 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 4 [2020-11-28 07:41:25,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 07:41:25,583 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-11-28 07:41:25,583 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-28 07:41:25,583 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-11-28 07:41:25,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2020-11-28 07:41:25,583 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 07:41:25,584 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2020-11-28 07:41:25,584 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-28 07:41:25,584 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]=== [2020-11-28 07:41:25,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 07:41:25,585 INFO L82 PathProgramCache]: Analyzing trace with hash 3471938, now seen corresponding path program 1 times [2020-11-28 07:41:25,585 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-28 07:41:25,585 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1243876225] [2020-11-28 07:41:25,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 07:41:25,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 07:41:25,619 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 07:41:25,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 07:41:25,645 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 07:41:25,671 INFO L173 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2020-11-28 07:41:25,671 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-28 07:41:25,671 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-11-28 07:41:25,689 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 28.11 07:41:25 BoogieIcfgContainer [2020-11-28 07:41:25,689 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-28 07:41:25,690 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-28 07:41:25,690 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-28 07:41:25,690 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-28 07:41:25,691 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 07:41:25" (3/4) ... [2020-11-28 07:41:25,697 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-11-28 07:41:25,731 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_dce46159-3919-43b6-ac67-510f673f3f09/bin/utaipan/witness.graphml [2020-11-28 07:41:25,731 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-28 07:41:25,733 INFO L168 Benchmark]: Toolchain (without parser) took 1973.67 ms. Allocated memory is still 107.0 MB. Free memory was 80.4 MB in the beginning and 49.4 MB in the end (delta: 31.1 MB). Peak memory consumption was 31.9 MB. Max. memory is 16.1 GB. [2020-11-28 07:41:25,734 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 81.8 MB. Free memory was 43.2 MB in the beginning and 43.1 MB in the end (delta: 55.9 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 07:41:25,734 INFO L168 Benchmark]: CACSL2BoogieTranslator took 557.60 ms. Allocated memory is still 107.0 MB. Free memory was 80.2 MB in the beginning and 73.9 MB in the end (delta: 6.3 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-11-28 07:41:25,735 INFO L168 Benchmark]: Boogie Procedure Inliner took 49.18 ms. Allocated memory is still 107.0 MB. Free memory was 73.9 MB in the beginning and 72.0 MB in the end (delta: 1.9 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 07:41:25,735 INFO L168 Benchmark]: Boogie Preprocessor took 25.79 ms. Allocated memory is still 107.0 MB. Free memory was 72.0 MB in the beginning and 70.7 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 07:41:25,736 INFO L168 Benchmark]: RCFGBuilder took 605.03 ms. Allocated memory is still 107.0 MB. Free memory was 70.7 MB in the beginning and 80.8 MB in the end (delta: -10.1 MB). Peak memory consumption was 26.9 MB. Max. memory is 16.1 GB. [2020-11-28 07:41:25,737 INFO L168 Benchmark]: TraceAbstraction took 685.29 ms. Allocated memory is still 107.0 MB. Free memory was 80.4 MB in the beginning and 51.0 MB in the end (delta: 29.4 MB). Peak memory consumption was 29.4 MB. Max. memory is 16.1 GB. [2020-11-28 07:41:25,737 INFO L168 Benchmark]: Witness Printer took 41.89 ms. Allocated memory is still 107.0 MB. Free memory was 51.0 MB in the beginning and 49.4 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-28 07:41:25,741 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 81.8 MB. Free memory was 43.2 MB in the beginning and 43.1 MB in the end (delta: 55.9 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 557.60 ms. Allocated memory is still 107.0 MB. Free memory was 80.2 MB in the beginning and 73.9 MB in the end (delta: 6.3 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 49.18 ms. Allocated memory is still 107.0 MB. Free memory was 73.9 MB in the beginning and 72.0 MB in the end (delta: 1.9 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 25.79 ms. Allocated memory is still 107.0 MB. Free memory was 72.0 MB in the beginning and 70.7 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 605.03 ms. Allocated memory is still 107.0 MB. Free memory was 70.7 MB in the beginning and 80.8 MB in the end (delta: -10.1 MB). Peak memory consumption was 26.9 MB. Max. memory is 16.1 GB. * TraceAbstraction took 685.29 ms. Allocated memory is still 107.0 MB. Free memory was 80.4 MB in the beginning and 51.0 MB in the end (delta: 29.4 MB). Peak memory consumption was 29.4 MB. Max. memory is 16.1 GB. * Witness Printer took 41.89 ms. Allocated memory is still 107.0 MB. Free memory was 51.0 MB in the beginning and 49.4 MB in the end (delta: 1.6 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