./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/count_down_unsafe_false-valid-deref.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 635dfa2a Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_b90f489b-f1c2-4bb8-97ce-32228812a16e/bin-2019/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_b90f489b-f1c2-4bb8-97ce-32228812a16e/bin-2019/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_b90f489b-f1c2-4bb8-97ce-32228812a16e/bin-2019/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_b90f489b-f1c2-4bb8-97ce-32228812a16e/bin-2019/utaipan/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/count_down_unsafe_false-valid-deref.i -s /tmp/vcloud-vcloud-master/worker/working_dir_b90f489b-f1c2-4bb8-97ce-32228812a16e/bin-2019/utaipan/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_b90f489b-f1c2-4bb8-97ce-32228812a16e/bin-2019/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 71c9f2b0d8bf95458c9b099304dfb78f8cadcf0a ................................................................................................................................................................................................................................................................................................................................ 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 0.1.23-635dfa2 [2018-12-02 02:41:15,177 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-12-02 02:41:15,178 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-12-02 02:41:15,184 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-12-02 02:41:15,184 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-12-02 02:41:15,185 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-12-02 02:41:15,185 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-12-02 02:41:15,186 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-12-02 02:41:15,187 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-12-02 02:41:15,187 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-12-02 02:41:15,188 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-12-02 02:41:15,188 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-12-02 02:41:15,188 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-12-02 02:41:15,189 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-12-02 02:41:15,189 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-12-02 02:41:15,190 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-12-02 02:41:15,190 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-12-02 02:41:15,191 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-12-02 02:41:15,192 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-12-02 02:41:15,193 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-12-02 02:41:15,193 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-12-02 02:41:15,194 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-12-02 02:41:15,195 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-12-02 02:41:15,195 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-12-02 02:41:15,195 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-12-02 02:41:15,196 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-12-02 02:41:15,197 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-12-02 02:41:15,197 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-12-02 02:41:15,197 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-12-02 02:41:15,198 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-12-02 02:41:15,198 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-12-02 02:41:15,198 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-12-02 02:41:15,199 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-12-02 02:41:15,199 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-12-02 02:41:15,199 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-12-02 02:41:15,200 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-12-02 02:41:15,200 INFO L98 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_b90f489b-f1c2-4bb8-97ce-32228812a16e/bin-2019/utaipan/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2018-12-02 02:41:15,207 INFO L110 SettingsManager]: Loading preferences was successful [2018-12-02 02:41:15,208 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-12-02 02:41:15,208 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-12-02 02:41:15,208 INFO L133 SettingsManager]: * ... calls to implemented procedures=ONLY_FOR_CONCURRENT_PROGRAMS [2018-12-02 02:41:15,208 INFO L133 SettingsManager]: * User list type=DISABLED [2018-12-02 02:41:15,208 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-12-02 02:41:15,208 INFO L133 SettingsManager]: * Explicit value domain=true [2018-12-02 02:41:15,209 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-12-02 02:41:15,209 INFO L133 SettingsManager]: * Octagon Domain=false [2018-12-02 02:41:15,209 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-12-02 02:41:15,209 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-12-02 02:41:15,209 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-12-02 02:41:15,209 INFO L133 SettingsManager]: * Interval Domain=false [2018-12-02 02:41:15,209 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-12-02 02:41:15,209 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-12-02 02:41:15,210 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-12-02 02:41:15,210 INFO L133 SettingsManager]: * sizeof long=4 [2018-12-02 02:41:15,210 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-12-02 02:41:15,210 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-12-02 02:41:15,210 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-12-02 02:41:15,210 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-12-02 02:41:15,210 INFO L133 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2018-12-02 02:41:15,210 INFO L133 SettingsManager]: * Bitprecise bitfields=true [2018-12-02 02:41:15,210 INFO L133 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2018-12-02 02:41:15,210 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-12-02 02:41:15,211 INFO L133 SettingsManager]: * sizeof long double=12 [2018-12-02 02:41:15,211 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-12-02 02:41:15,211 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-12-02 02:41:15,211 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-12-02 02:41:15,211 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-12-02 02:41:15,211 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-12-02 02:41:15,211 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-12-02 02:41:15,211 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-12-02 02:41:15,211 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-12-02 02:41:15,211 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-12-02 02:41:15,211 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-12-02 02:41:15,212 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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/working_dir_b90f489b-f1c2-4bb8-97ce-32228812a16e/bin-2019/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 -> 71c9f2b0d8bf95458c9b099304dfb78f8cadcf0a [2018-12-02 02:41:15,229 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-12-02 02:41:15,238 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-12-02 02:41:15,240 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-12-02 02:41:15,242 INFO L271 PluginConnector]: Initializing CDTParser... [2018-12-02 02:41:15,242 INFO L276 PluginConnector]: CDTParser initialized [2018-12-02 02:41:15,242 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_b90f489b-f1c2-4bb8-97ce-32228812a16e/bin-2019/utaipan/../../sv-benchmarks/c/array-memsafety/count_down_unsafe_false-valid-deref.i [2018-12-02 02:41:15,285 INFO L221 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_b90f489b-f1c2-4bb8-97ce-32228812a16e/bin-2019/utaipan/data/d03caa847/cf3be41ec76b4dc494d77528869eebbf/FLAGa8e9d6694 [2018-12-02 02:41:15,664 INFO L307 CDTParser]: Found 1 translation units. [2018-12-02 02:41:15,664 INFO L161 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_b90f489b-f1c2-4bb8-97ce-32228812a16e/sv-benchmarks/c/array-memsafety/count_down_unsafe_false-valid-deref.i [2018-12-02 02:41:15,670 INFO L355 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_b90f489b-f1c2-4bb8-97ce-32228812a16e/bin-2019/utaipan/data/d03caa847/cf3be41ec76b4dc494d77528869eebbf/FLAGa8e9d6694 [2018-12-02 02:41:15,677 INFO L363 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_b90f489b-f1c2-4bb8-97ce-32228812a16e/bin-2019/utaipan/data/d03caa847/cf3be41ec76b4dc494d77528869eebbf [2018-12-02 02:41:15,679 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-12-02 02:41:15,680 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2018-12-02 02:41:15,681 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-12-02 02:41:15,681 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-12-02 02:41:15,682 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-12-02 02:41:15,683 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 02:41:15" (1/1) ... [2018-12-02 02:41:15,685 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@68649384 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:41:15, skipping insertion in model container [2018-12-02 02:41:15,685 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 02:41:15" (1/1) ... [2018-12-02 02:41:15,690 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-12-02 02:41:15,711 INFO L176 MainTranslator]: Built tables and reachable declarations [2018-12-02 02:41:15,869 INFO L203 PostProcessor]: Analyzing one entry point: main [2018-12-02 02:41:15,875 INFO L191 MainTranslator]: Completed pre-run [2018-12-02 02:41:15,926 INFO L203 PostProcessor]: Analyzing one entry point: main [2018-12-02 02:41:15,946 INFO L195 MainTranslator]: Completed translation [2018-12-02 02:41:15,947 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:41:15 WrapperNode [2018-12-02 02:41:15,947 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-12-02 02:41:15,947 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-12-02 02:41:15,947 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-12-02 02:41:15,947 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-12-02 02:41:15,952 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:41:15" (1/1) ... [2018-12-02 02:41:15,959 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:41:15" (1/1) ... [2018-12-02 02:41:15,963 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-12-02 02:41:15,964 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-12-02 02:41:15,964 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-12-02 02:41:15,964 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-12-02 02:41:15,969 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:41:15" (1/1) ... [2018-12-02 02:41:15,969 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:41:15" (1/1) ... [2018-12-02 02:41:15,970 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:41:15" (1/1) ... [2018-12-02 02:41:15,970 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:41:15" (1/1) ... [2018-12-02 02:41:15,974 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:41:15" (1/1) ... [2018-12-02 02:41:15,977 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:41:15" (1/1) ... [2018-12-02 02:41:15,978 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:41:15" (1/1) ... [2018-12-02 02:41:15,979 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-12-02 02:41:15,979 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-12-02 02:41:15,979 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-12-02 02:41:15,979 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-12-02 02:41:15,980 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:41:15" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_b90f489b-f1c2-4bb8-97ce-32228812a16e/bin-2019/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 [2018-12-02 02:41:16,009 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-12-02 02:41:16,009 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2018-12-02 02:41:16,009 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2018-12-02 02:41:16,010 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-12-02 02:41:16,010 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-12-02 02:41:16,010 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-12-02 02:41:16,010 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-12-02 02:41:16,010 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-12-02 02:41:16,010 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-12-02 02:41:16,010 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-12-02 02:41:16,148 INFO L275 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-12-02 02:41:16,149 INFO L280 CfgBuilder]: Removed 3 assue(true) statements. [2018-12-02 02:41:16,149 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 02:41:16 BoogieIcfgContainer [2018-12-02 02:41:16,149 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-12-02 02:41:16,149 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-12-02 02:41:16,149 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-12-02 02:41:16,151 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-12-02 02:41:16,152 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 02:41:15" (1/3) ... [2018-12-02 02:41:16,152 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@27033ac3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 02:41:16, skipping insertion in model container [2018-12-02 02:41:16,152 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:41:15" (2/3) ... [2018-12-02 02:41:16,152 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@27033ac3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 02:41:16, skipping insertion in model container [2018-12-02 02:41:16,152 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 02:41:16" (3/3) ... [2018-12-02 02:41:16,153 INFO L112 eAbstractionObserver]: Analyzing ICFG count_down_unsafe_false-valid-deref.i [2018-12-02 02:41:16,159 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-12-02 02:41:16,162 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 9 error locations. [2018-12-02 02:41:16,171 INFO L257 AbstractCegarLoop]: Starting to check reachability of 9 error locations. [2018-12-02 02:41:16,186 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-12-02 02:41:16,186 INFO L383 AbstractCegarLoop]: Hoare is false [2018-12-02 02:41:16,186 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-12-02 02:41:16,186 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-12-02 02:41:16,186 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-12-02 02:41:16,186 INFO L387 AbstractCegarLoop]: Difference is false [2018-12-02 02:41:16,186 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-12-02 02:41:16,186 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-12-02 02:41:16,196 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states. [2018-12-02 02:41:16,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-12-02 02:41:16,201 INFO L394 BasicCegarLoop]: Found error trace [2018-12-02 02:41:16,201 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-02 02:41:16,203 INFO L423 AbstractCegarLoop]: === Iteration 1 === [mainErr4REQUIRES_VIOLATION, mainErr5REQUIRES_VIOLATION, mainErr0REQUIRES_VIOLATION, mainErr6REQUIRES_VIOLATION, mainErr8ENSURES_VIOLATIONMEMORY_LEAK, mainErr1REQUIRES_VIOLATION, mainErr7REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION]=== [2018-12-02 02:41:16,206 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-02 02:41:16,206 INFO L82 PathProgramCache]: Analyzing trace with hash 1191221624, now seen corresponding path program 1 times [2018-12-02 02:41:16,207 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-02 02:41:16,235 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 02:41:16,235 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-02 02:41:16,235 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 02:41:16,235 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-02 02:41:16,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 02:41:16,294 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-02 02:41:16,295 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-02 02:41:16,296 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-12-02 02:41:16,296 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-02 02:41:16,298 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-12-02 02:41:16,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-12-02 02:41:16,307 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-02 02:41:16,308 INFO L87 Difference]: Start difference. First operand 36 states. Second operand 3 states. [2018-12-02 02:41:16,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-02 02:41:16,341 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2018-12-02 02:41:16,341 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-12-02 02:41:16,342 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2018-12-02 02:41:16,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-02 02:41:16,347 INFO L225 Difference]: With dead ends: 36 [2018-12-02 02:41:16,347 INFO L226 Difference]: Without dead ends: 33 [2018-12-02 02:41:16,348 INFO L631 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-02 02:41:16,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-12-02 02:41:16,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-12-02 02:41:16,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-12-02 02:41:16,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2018-12-02 02:41:16,369 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 10 [2018-12-02 02:41:16,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-02 02:41:16,369 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2018-12-02 02:41:16,369 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-12-02 02:41:16,369 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2018-12-02 02:41:16,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-12-02 02:41:16,369 INFO L394 BasicCegarLoop]: Found error trace [2018-12-02 02:41:16,369 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-02 02:41:16,370 INFO L423 AbstractCegarLoop]: === Iteration 2 === [mainErr4REQUIRES_VIOLATION, mainErr5REQUIRES_VIOLATION, mainErr0REQUIRES_VIOLATION, mainErr6REQUIRES_VIOLATION, mainErr8ENSURES_VIOLATIONMEMORY_LEAK, mainErr1REQUIRES_VIOLATION, mainErr7REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION]=== [2018-12-02 02:41:16,370 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-02 02:41:16,370 INFO L82 PathProgramCache]: Analyzing trace with hash -1992307641, now seen corresponding path program 1 times [2018-12-02 02:41:16,370 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-02 02:41:16,371 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 02:41:16,371 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-02 02:41:16,371 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 02:41:16,371 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-02 02:41:16,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-12-02 02:41:16,395 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-12-02 02:41:16,396 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-12-02 02:41:16,396 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-12-02 02:41:16,396 INFO L256 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-12-02 02:41:16,397 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-12-02 02:41:16,397 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-12-02 02:41:16,398 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-12-02 02:41:16,398 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 3 states. [2018-12-02 02:41:16,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-12-02 02:41:16,423 INFO L93 Difference]: Finished difference Result 29 states and 33 transitions. [2018-12-02 02:41:16,423 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-12-02 02:41:16,423 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2018-12-02 02:41:16,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-12-02 02:41:16,424 INFO L225 Difference]: With dead ends: 29 [2018-12-02 02:41:16,424 INFO L226 Difference]: Without dead ends: 29 [2018-12-02 02:41:16,424 INFO L631 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 [2018-12-02 02:41:16,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-12-02 02:41:16,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-12-02 02:41:16,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-12-02 02:41:16,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2018-12-02 02:41:16,426 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 12 [2018-12-02 02:41:16,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-12-02 02:41:16,427 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2018-12-02 02:41:16,427 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-12-02 02:41:16,427 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2018-12-02 02:41:16,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2018-12-02 02:41:16,427 INFO L394 BasicCegarLoop]: Found error trace [2018-12-02 02:41:16,427 INFO L402 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-12-02 02:41:16,427 INFO L423 AbstractCegarLoop]: === Iteration 3 === [mainErr4REQUIRES_VIOLATION, mainErr5REQUIRES_VIOLATION, mainErr0REQUIRES_VIOLATION, mainErr6REQUIRES_VIOLATION, mainErr8ENSURES_VIOLATIONMEMORY_LEAK, mainErr1REQUIRES_VIOLATION, mainErr7REQUIRES_VIOLATION, mainErr2REQUIRES_VIOLATION, mainErr3REQUIRES_VIOLATION]=== [2018-12-02 02:41:16,427 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-12-02 02:41:16,427 INFO L82 PathProgramCache]: Analyzing trace with hash -1992307640, now seen corresponding path program 1 times [2018-12-02 02:41:16,428 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-12-02 02:41:16,428 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 02:41:16,428 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-12-02 02:41:16,428 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-12-02 02:41:16,428 INFO L286 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-12-02 02:41:16,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-12-02 02:41:16,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-12-02 02:41:16,456 INFO L469 BasicCegarLoop]: Counterexample might be feasible [2018-12-02 02:41:16,469 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.12 02:41:16 BoogieIcfgContainer [2018-12-02 02:41:16,470 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-12-02 02:41:16,470 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2018-12-02 02:41:16,470 INFO L271 PluginConnector]: Initializing Witness Printer... [2018-12-02 02:41:16,470 INFO L276 PluginConnector]: Witness Printer initialized [2018-12-02 02:41:16,470 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 02:41:16" (3/4) ... [2018-12-02 02:41:16,471 INFO L138 WitnessPrinter]: Generating witness for reachability counterexample [2018-12-02 02:41:16,495 INFO L145 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_b90f489b-f1c2-4bb8-97ce-32228812a16e/bin-2019/utaipan/witness.graphml [2018-12-02 02:41:16,495 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2018-12-02 02:41:16,496 INFO L168 Benchmark]: Toolchain (without parser) took 816.41 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 131.6 MB). Free memory was 947.0 MB in the beginning and 1.0 GB in the end (delta: -98.1 MB). Peak memory consumption was 33.5 MB. Max. memory is 11.5 GB. [2018-12-02 02:41:16,497 INFO L168 Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 1.0 GB. Free memory is still 973.3 MB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-02 02:41:16,497 INFO L168 Benchmark]: CACSL2BoogieTranslator took 266.37 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 131.6 MB). Free memory was 947.0 MB in the beginning and 1.1 GB in the end (delta: -168.6 MB). Peak memory consumption was 24.6 MB. Max. memory is 11.5 GB. [2018-12-02 02:41:16,497 INFO L168 Benchmark]: Boogie Procedure Inliner took 16.45 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-02 02:41:16,498 INFO L168 Benchmark]: Boogie Preprocessor took 15.19 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. [2018-12-02 02:41:16,498 INFO L168 Benchmark]: RCFGBuilder took 169.90 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 25.4 MB). Peak memory consumption was 25.4 MB. Max. memory is 11.5 GB. [2018-12-02 02:41:16,498 INFO L168 Benchmark]: TraceAbstraction took 320.20 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 38.1 MB). Peak memory consumption was 38.1 MB. Max. memory is 11.5 GB. [2018-12-02 02:41:16,498 INFO L168 Benchmark]: Witness Printer took 25.74 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.0 GB in the end (delta: 6.9 MB). Peak memory consumption was 6.9 MB. Max. memory is 11.5 GB. [2018-12-02 02:41:16,500 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.17 ms. Allocated memory is still 1.0 GB. Free memory is still 973.3 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 266.37 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 131.6 MB). Free memory was 947.0 MB in the beginning and 1.1 GB in the end (delta: -168.6 MB). Peak memory consumption was 24.6 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 16.45 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 15.19 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 169.90 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 25.4 MB). Peak memory consumption was 25.4 MB. Max. memory is 11.5 GB. * TraceAbstraction took 320.20 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 38.1 MB). Peak memory consumption was 38.1 MB. Max. memory is 11.5 GB. * Witness Printer took 25.74 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.0 GB in the end (delta: 6.9 MB). Peak memory consumption was 6.9 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 552]: pointer dereference may fail pointer dereference may fail We found a FailurePath: [L541] int i, j; [L542] int val; [L543] int length = __VERIFIER_nondet_int(); [L544] COND TRUE length < 1 [L544] length = 1 VAL [length=1] [L545] int *arr = __builtin_alloca (length); VAL [__builtin_alloca (length)={3:0}, arr={3:0}, length=1] [L546] COND FALSE !(!arr) [L547] i=0 VAL [__builtin_alloca (length)={3:0}, arr={3:0}, i=0, length=1] [L547] COND TRUE i