./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/ldv-regression/recursive_list.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 7b2dab56 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_9b3b5527-efe4-4df6-a2d0-110cbe64f271/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_9b3b5527-efe4-4df6-a2d0-110cbe64f271/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_9b3b5527-efe4-4df6-a2d0-110cbe64f271/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_9b3b5527-efe4-4df6-a2d0-110cbe64f271/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/ldv-regression/recursive_list.i -s /tmp/vcloud-vcloud-master/worker/run_dir_9b3b5527-efe4-4df6-a2d0-110cbe64f271/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_9b3b5527-efe4-4df6-a2d0-110cbe64f271/bin/utaipan --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 37b220fd67c69dd62d320a9e830f108e76b0f2e5 ......................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.2.0-7b2dab5 [2020-12-09 06:19:00,948 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-09 06:19:00,957 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-09 06:19:00,990 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-09 06:19:00,990 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-09 06:19:00,991 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-09 06:19:00,992 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-09 06:19:00,994 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-09 06:19:00,996 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-09 06:19:00,996 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-09 06:19:00,997 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-09 06:19:00,998 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-09 06:19:00,999 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-09 06:19:00,999 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-09 06:19:01,000 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-09 06:19:01,001 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-09 06:19:01,002 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-09 06:19:01,003 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-09 06:19:01,004 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-09 06:19:01,006 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-09 06:19:01,008 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-09 06:19:01,009 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-09 06:19:01,010 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-09 06:19:01,010 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-09 06:19:01,013 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-12-09 06:19:01,013 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-12-09 06:19:01,014 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-12-09 06:19:01,014 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-12-09 06:19:01,015 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-12-09 06:19:01,016 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-12-09 06:19:01,016 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-09 06:19:01,017 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-09 06:19:01,017 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-09 06:19:01,018 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-09 06:19:01,019 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-09 06:19:01,019 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-09 06:19:01,020 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-09 06:19:01,020 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-09 06:19:01,020 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-09 06:19:01,021 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-09 06:19:01,022 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-09 06:19:01,022 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_9b3b5527-efe4-4df6-a2d0-110cbe64f271/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-12-09 06:19:01,039 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-09 06:19:01,039 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-09 06:19:01,040 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-12-09 06:19:01,040 INFO L138 SettingsManager]: * User list type=DISABLED [2020-12-09 06:19:01,040 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-12-09 06:19:01,040 INFO L138 SettingsManager]: * Explicit value domain=true [2020-12-09 06:19:01,040 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-12-09 06:19:01,040 INFO L138 SettingsManager]: * Octagon Domain=false [2020-12-09 06:19:01,041 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-12-09 06:19:01,041 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-12-09 06:19:01,041 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-12-09 06:19:01,041 INFO L138 SettingsManager]: * Interval Domain=false [2020-12-09 06:19:01,041 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-12-09 06:19:01,041 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-12-09 06:19:01,041 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-12-09 06:19:01,042 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-09 06:19:01,042 INFO L138 SettingsManager]: * sizeof long=4 [2020-12-09 06:19:01,042 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-09 06:19:01,042 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-12-09 06:19:01,042 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-09 06:19:01,042 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-09 06:19:01,043 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-09 06:19:01,043 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-09 06:19:01,043 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-12-09 06:19:01,043 INFO L138 SettingsManager]: * sizeof long double=12 [2020-12-09 06:19:01,043 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-09 06:19:01,043 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-09 06:19:01,043 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-09 06:19:01,043 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-09 06:19:01,044 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-09 06:19:01,044 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-09 06:19:01,044 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-09 06:19:01,044 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-09 06:19:01,044 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-09 06:19:01,044 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-12-09 06:19:01,044 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-09 06:19:01,044 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-09 06:19:01,045 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-09 06:19:01,045 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-12-09 06:19:01,045 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_9b3b5527-efe4-4df6-a2d0-110cbe64f271/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_9b3b5527-efe4-4df6-a2d0-110cbe64f271/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 37b220fd67c69dd62d320a9e830f108e76b0f2e5 [2020-12-09 06:19:01,225 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-09 06:19:01,240 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-09 06:19:01,242 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-09 06:19:01,243 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-09 06:19:01,244 INFO L275 PluginConnector]: CDTParser initialized [2020-12-09 06:19:01,244 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_9b3b5527-efe4-4df6-a2d0-110cbe64f271/bin/utaipan/../../sv-benchmarks/c/ldv-regression/recursive_list.i [2020-12-09 06:19:01,288 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_9b3b5527-efe4-4df6-a2d0-110cbe64f271/bin/utaipan/data/4a56eb43e/a11e0a49bc3e45e893f18f1b10d0e834/FLAGf52bd4a89 [2020-12-09 06:19:01,644 INFO L306 CDTParser]: Found 1 translation units. [2020-12-09 06:19:01,644 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_9b3b5527-efe4-4df6-a2d0-110cbe64f271/sv-benchmarks/c/ldv-regression/recursive_list.i [2020-12-09 06:19:01,649 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_9b3b5527-efe4-4df6-a2d0-110cbe64f271/bin/utaipan/data/4a56eb43e/a11e0a49bc3e45e893f18f1b10d0e834/FLAGf52bd4a89 [2020-12-09 06:19:01,661 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_9b3b5527-efe4-4df6-a2d0-110cbe64f271/bin/utaipan/data/4a56eb43e/a11e0a49bc3e45e893f18f1b10d0e834 [2020-12-09 06:19:01,663 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-09 06:19:01,664 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-09 06:19:01,666 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-09 06:19:01,666 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-09 06:19:01,669 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-09 06:19:01,669 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 06:19:01" (1/1) ... [2020-12-09 06:19:01,671 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7dd6d8b2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:19:01, skipping insertion in model container [2020-12-09 06:19:01,671 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 06:19:01" (1/1) ... [2020-12-09 06:19:01,677 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-09 06:19:01,687 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-09 06:19:01,791 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud-vcloud-master/worker/run_dir_9b3b5527-efe4-4df6-a2d0-110cbe64f271/sv-benchmarks/c/ldv-regression/recursive_list.i[409,422] [2020-12-09 06:19:01,810 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 06:19:01,819 INFO L203 MainTranslator]: Completed pre-run [2020-12-09 06:19:01,827 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud-vcloud-master/worker/run_dir_9b3b5527-efe4-4df6-a2d0-110cbe64f271/sv-benchmarks/c/ldv-regression/recursive_list.i[409,422] [2020-12-09 06:19:01,831 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 06:19:01,843 INFO L208 MainTranslator]: Completed translation [2020-12-09 06:19:01,843 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:19:01 WrapperNode [2020-12-09 06:19:01,843 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-09 06:19:01,844 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-09 06:19:01,844 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-09 06:19:01,844 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-09 06:19:01,850 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:19:01" (1/1) ... [2020-12-09 06:19:01,855 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:19:01" (1/1) ... [2020-12-09 06:19:01,869 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-09 06:19:01,869 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-09 06:19:01,869 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-09 06:19:01,870 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-09 06:19:01,875 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:19:01" (1/1) ... [2020-12-09 06:19:01,875 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:19:01" (1/1) ... [2020-12-09 06:19:01,877 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:19:01" (1/1) ... [2020-12-09 06:19:01,878 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:19:01" (1/1) ... [2020-12-09 06:19:01,882 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:19:01" (1/1) ... [2020-12-09 06:19:01,884 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:19:01" (1/1) ... [2020-12-09 06:19:01,885 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:19:01" (1/1) ... [2020-12-09 06:19:01,887 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-09 06:19:01,888 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-09 06:19:01,888 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-09 06:19:01,888 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-09 06:19:01,889 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:19:01" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_9b3b5527-efe4-4df6-a2d0-110cbe64f271/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 06:19:01,946 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-12-09 06:19:01,946 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-09 06:19:01,946 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-12-09 06:19:01,946 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-09 06:19:01,946 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-09 06:19:01,946 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-12-09 06:19:01,946 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-09 06:19:01,947 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-09 06:19:01,947 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-09 06:19:01,947 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-09 06:19:02,303 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-09 06:19:02,303 INFO L299 CfgBuilder]: Removed 14 assume(true) statements. [2020-12-09 06:19:02,305 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 06:19:02 BoogieIcfgContainer [2020-12-09 06:19:02,305 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-09 06:19:02,307 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-09 06:19:02,307 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-09 06:19:02,310 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-09 06:19:02,310 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.12 06:19:01" (1/3) ... [2020-12-09 06:19:02,311 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@583d75e1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 06:19:02, skipping insertion in model container [2020-12-09 06:19:02,311 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 06:19:01" (2/3) ... [2020-12-09 06:19:02,311 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@583d75e1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 06:19:02, skipping insertion in model container [2020-12-09 06:19:02,311 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 06:19:02" (3/3) ... [2020-12-09 06:19:02,313 INFO L111 eAbstractionObserver]: Analyzing ICFG recursive_list.i [2020-12-09 06:19:02,325 INFO L180 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-09 06:19:02,328 INFO L192 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-09 06:19:02,336 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-09 06:19:02,353 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-09 06:19:02,353 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-09 06:19:02,353 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-09 06:19:02,353 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-09 06:19:02,353 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-09 06:19:02,353 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-09 06:19:02,353 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-09 06:19:02,353 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-09 06:19:02,362 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states. [2020-12-09 06:19:02,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2020-12-09 06:19:02,365 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 06:19:02,365 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1] [2020-12-09 06:19:02,366 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 06:19:02,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 06:19:02,369 INFO L82 PathProgramCache]: Analyzing trace with hash 59039, now seen corresponding path program 1 times [2020-12-09 06:19:02,376 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 06:19:02,376 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1068509578] [2020-12-09 06:19:02,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 06:19:02,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-09 06:19:02,486 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-09 06:19:02,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-09 06:19:02,519 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-09 06:19:02,537 INFO L173 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2020-12-09 06:19:02,537 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-12-09 06:19:02,537 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-09 06:19:02,554 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 09.12 06:19:02 BoogieIcfgContainer [2020-12-09 06:19:02,555 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-09 06:19:02,555 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-09 06:19:02,555 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-09 06:19:02,555 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-09 06:19:02,556 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 06:19:02" (3/4) ... [2020-12-09 06:19:02,557 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-12-09 06:19:02,588 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_9b3b5527-efe4-4df6-a2d0-110cbe64f271/bin/utaipan/witness.graphml [2020-12-09 06:19:02,588 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-09 06:19:02,590 INFO L168 Benchmark]: Toolchain (without parser) took 924.89 ms. Allocated memory was 79.7 MB in the beginning and 102.8 MB in the end (delta: 23.1 MB). Free memory was 50.9 MB in the beginning and 49.0 MB in the end (delta: 1.8 MB). Peak memory consumption was 24.4 MB. Max. memory is 16.1 GB. [2020-12-09 06:19:02,590 INFO L168 Benchmark]: CDTParser took 0.12 ms. Allocated memory is still 79.7 MB. Free memory was 37.9 MB in the beginning and 37.8 MB in the end (delta: 53.9 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 06:19:02,591 INFO L168 Benchmark]: CACSL2BoogieTranslator took 177.62 ms. Allocated memory was 79.7 MB in the beginning and 102.8 MB in the end (delta: 23.1 MB). Free memory was 50.6 MB in the beginning and 79.4 MB in the end (delta: -28.8 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-12-09 06:19:02,591 INFO L168 Benchmark]: Boogie Procedure Inliner took 24.96 ms. Allocated memory is still 102.8 MB. Free memory was 79.4 MB in the beginning and 77.9 MB in the end (delta: 1.6 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 06:19:02,592 INFO L168 Benchmark]: Boogie Preprocessor took 17.83 ms. Allocated memory is still 102.8 MB. Free memory was 77.9 MB in the beginning and 77.0 MB in the end (delta: 918.8 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-09 06:19:02,592 INFO L168 Benchmark]: RCFGBuilder took 417.37 ms. Allocated memory is still 102.8 MB. Free memory was 76.6 MB in the beginning and 67.4 MB in the end (delta: 9.2 MB). Peak memory consumption was 27.1 MB. Max. memory is 16.1 GB. [2020-12-09 06:19:02,593 INFO L168 Benchmark]: TraceAbstraction took 248.01 ms. Allocated memory is still 102.8 MB. Free memory was 66.9 MB in the beginning and 51.2 MB in the end (delta: 15.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. [2020-12-09 06:19:02,593 INFO L168 Benchmark]: Witness Printer took 33.31 ms. Allocated memory is still 102.8 MB. Free memory was 51.2 MB in the beginning and 49.0 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-09 06:19:02,595 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 79.7 MB. Free memory was 37.9 MB in the beginning and 37.8 MB in the end (delta: 53.9 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 177.62 ms. Allocated memory was 79.7 MB in the beginning and 102.8 MB in the end (delta: 23.1 MB). Free memory was 50.6 MB in the beginning and 79.4 MB in the end (delta: -28.8 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 24.96 ms. Allocated memory is still 102.8 MB. Free memory was 79.4 MB in the beginning and 77.9 MB in the end (delta: 1.6 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 17.83 ms. Allocated memory is still 102.8 MB. Free memory was 77.9 MB in the beginning and 77.0 MB in the end (delta: 918.8 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 417.37 ms. Allocated memory is still 102.8 MB. Free memory was 76.6 MB in the beginning and 67.4 MB in the end (delta: 9.2 MB). Peak memory consumption was 27.1 MB. Max. memory is 16.1 GB. * TraceAbstraction took 248.01 ms. Allocated memory is still 102.8 MB. Free memory was 66.9 MB in the beginning and 51.2 MB in the end (delta: 15.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. * Witness Printer took 33.31 ms. Allocated memory is still 102.8 MB. Free memory was 51.2 MB in the beginning and 49.0 MB in the end (delta: 2.1 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: 10]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L19] int i = 1; [L39] struct list *l,m; [L40] l = &m [L41] l->next = 0 [L42] l->n = 0 [L27] struct list *new_el; [L22] return malloc(8U); [L29] new_el = allocate_memory() [L31] new_el->n = n [L32] new_el->next = l [L34] return new_el; [L44] l = append(l, 1) [L27] struct list *new_el; [L22] return malloc(8U); [L29] new_el = allocate_memory() [L31] new_el->n = n [L32] new_el->next = l [L34] return new_el; [L45] l = append(l, 2) [L50] EXPR l->next [L50] EXPR l->next->next [L50] EXPR l->next->next->n VAL [i=1] [L50] COND TRUE l->next->next->n == 0 [L10] reach_error() VAL [i=1] - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 6 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 0.1s, OverallIterations: 1, TraceHistogramMax: 1, AutomataDifference: 0.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: No data available, PredicateUnifierStatistics: No data available, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=6occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: No data available, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.0s InterpolantComputationTime, 3 NumberOfCodeBlocks, 3 NumberOfCodeBlocksAsserted, 1 NumberOfCheckSat, 0 ConstructedInterpolants, 0 QuantifiedInterpolants, 0 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 0 InterpolantComputations, 0 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...