./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/list-properties/list_flag-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version a4ecdabc Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_632cb24d-24c1-4840-9e3a-6c3ae2ff5096/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_632cb24d-24c1-4840-9e3a-6c3ae2ff5096/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_632cb24d-24c1-4840-9e3a-6c3ae2ff5096/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_632cb24d-24c1-4840-9e3a-6c3ae2ff5096/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/list-properties/list_flag-1.i -s /tmp/vcloud-vcloud-master/worker/run_dir_632cb24d-24c1-4840-9e3a-6c3ae2ff5096/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_632cb24d-24c1-4840-9e3a-6c3ae2ff5096/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 8d8f817036215afe0570c141fddfde907924f85b ............................................................................................................................................................................................................................................................................................................................................................................................................................. 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-a4ecdab [2020-11-22 13:09:00,789 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-22 13:09:00,792 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-22 13:09:00,864 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-22 13:09:00,868 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-22 13:09:00,873 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-22 13:09:00,876 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-22 13:09:00,884 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-22 13:09:00,886 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-22 13:09:00,892 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-22 13:09:00,893 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-22 13:09:00,896 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-22 13:09:00,896 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-22 13:09:00,900 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-22 13:09:00,901 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-22 13:09:00,903 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-22 13:09:00,904 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-22 13:09:00,906 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-22 13:09:00,911 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-22 13:09:00,919 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-22 13:09:00,921 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-22 13:09:00,922 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-22 13:09:00,925 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-22 13:09:00,926 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-22 13:09:00,935 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-22 13:09:00,935 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-22 13:09:00,936 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-22 13:09:00,938 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-22 13:09:00,939 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-22 13:09:00,940 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-22 13:09:00,941 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-22 13:09:00,942 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-22 13:09:00,944 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-22 13:09:00,945 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-22 13:09:00,947 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-22 13:09:00,947 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-22 13:09:00,948 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-22 13:09:00,949 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-22 13:09:00,949 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-22 13:09:00,950 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-22 13:09:00,951 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-22 13:09:00,954 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_632cb24d-24c1-4840-9e3a-6c3ae2ff5096/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-11-22 13:09:00,999 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-22 13:09:00,999 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-22 13:09:01,000 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-11-22 13:09:01,001 INFO L138 SettingsManager]: * User list type=DISABLED [2020-11-22 13:09:01,001 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-11-22 13:09:01,001 INFO L138 SettingsManager]: * Explicit value domain=true [2020-11-22 13:09:01,002 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-11-22 13:09:01,002 INFO L138 SettingsManager]: * Octagon Domain=false [2020-11-22 13:09:01,002 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-11-22 13:09:01,003 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-11-22 13:09:01,004 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-11-22 13:09:01,004 INFO L138 SettingsManager]: * Interval Domain=false [2020-11-22 13:09:01,004 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-11-22 13:09:01,005 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-11-22 13:09:01,005 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-11-22 13:09:01,006 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-22 13:09:01,006 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-22 13:09:01,006 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-22 13:09:01,007 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-22 13:09:01,007 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-22 13:09:01,007 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-22 13:09:01,007 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-22 13:09:01,008 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-22 13:09:01,008 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-11-22 13:09:01,008 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-22 13:09:01,009 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-22 13:09:01,009 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-22 13:09:01,009 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-22 13:09:01,010 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-22 13:09:01,011 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-22 13:09:01,012 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-22 13:09:01,012 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-22 13:09:01,012 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-22 13:09:01,013 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-22 13:09:01,013 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-22 13:09:01,013 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-11-22 13:09:01,014 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-22 13:09:01,014 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-22 13:09:01,014 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-22 13:09:01,014 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-11-22 13:09:01,015 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_632cb24d-24c1-4840-9e3a-6c3ae2ff5096/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_632cb24d-24c1-4840-9e3a-6c3ae2ff5096/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8d8f817036215afe0570c141fddfde907924f85b [2020-11-22 13:09:01,304 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-22 13:09:01,329 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-22 13:09:01,332 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-22 13:09:01,333 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-22 13:09:01,334 INFO L275 PluginConnector]: CDTParser initialized [2020-11-22 13:09:01,335 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_632cb24d-24c1-4840-9e3a-6c3ae2ff5096/bin/utaipan/../../sv-benchmarks/c/list-properties/list_flag-1.i [2020-11-22 13:09:01,418 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_632cb24d-24c1-4840-9e3a-6c3ae2ff5096/bin/utaipan/data/f7ab6ffdf/91fa6a9806ab496099addfaffb9c0dda/FLAGbbc68d5aa [2020-11-22 13:09:01,999 INFO L306 CDTParser]: Found 1 translation units. [2020-11-22 13:09:01,999 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_632cb24d-24c1-4840-9e3a-6c3ae2ff5096/sv-benchmarks/c/list-properties/list_flag-1.i [2020-11-22 13:09:02,030 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_632cb24d-24c1-4840-9e3a-6c3ae2ff5096/bin/utaipan/data/f7ab6ffdf/91fa6a9806ab496099addfaffb9c0dda/FLAGbbc68d5aa [2020-11-22 13:09:02,303 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_632cb24d-24c1-4840-9e3a-6c3ae2ff5096/bin/utaipan/data/f7ab6ffdf/91fa6a9806ab496099addfaffb9c0dda [2020-11-22 13:09:02,305 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-22 13:09:02,306 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-22 13:09:02,308 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-22 13:09:02,308 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-22 13:09:02,311 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-22 13:09:02,311 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 01:09:02" (1/1) ... [2020-11-22 13:09:02,313 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@700d83d1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:09:02, skipping insertion in model container [2020-11-22 13:09:02,314 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 01:09:02" (1/1) ... [2020-11-22 13:09:02,326 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-22 13:09:02,375 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-22 13:09:02,792 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-22 13:09:02,801 INFO L203 MainTranslator]: Completed pre-run [2020-11-22 13:09:02,870 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-22 13:09:02,941 INFO L208 MainTranslator]: Completed translation [2020-11-22 13:09:02,942 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:09:02 WrapperNode [2020-11-22 13:09:02,943 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-22 13:09:02,944 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-22 13:09:02,944 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-22 13:09:02,944 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-22 13:09:02,952 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:09:02" (1/1) ... [2020-11-22 13:09:02,992 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:09:02" (1/1) ... [2020-11-22 13:09:03,018 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-22 13:09:03,019 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-22 13:09:03,019 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-22 13:09:03,019 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-22 13:09:03,027 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:09:02" (1/1) ... [2020-11-22 13:09:03,028 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:09:02" (1/1) ... [2020-11-22 13:09:03,031 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:09:02" (1/1) ... [2020-11-22 13:09:03,031 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:09:02" (1/1) ... [2020-11-22 13:09:03,037 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:09:02" (1/1) ... [2020-11-22 13:09:03,040 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:09:02" (1/1) ... [2020-11-22 13:09:03,042 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:09:02" (1/1) ... [2020-11-22 13:09:03,045 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-22 13:09:03,046 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-22 13:09:03,046 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-22 13:09:03,046 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-22 13:09:03,047 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:09:02" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_632cb24d-24c1-4840-9e3a-6c3ae2ff5096/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 [2020-11-22 13:09:03,106 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-11-22 13:09:03,106 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-11-22 13:09:03,106 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-11-22 13:09:03,106 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-11-22 13:09:03,106 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-22 13:09:03,107 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-11-22 13:09:03,107 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-22 13:09:03,107 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-22 13:09:03,107 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-22 13:09:03,621 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-22 13:09:03,621 INFO L298 CfgBuilder]: Removed 13 assume(true) statements. [2020-11-22 13:09:03,623 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 01:09:03 BoogieIcfgContainer [2020-11-22 13:09:03,624 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-22 13:09:03,625 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-22 13:09:03,625 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-22 13:09:03,628 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-22 13:09:03,629 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 01:09:02" (1/3) ... [2020-11-22 13:09:03,629 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a224196 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 01:09:03, skipping insertion in model container [2020-11-22 13:09:03,629 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:09:02" (2/3) ... [2020-11-22 13:09:03,630 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a224196 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 01:09:03, skipping insertion in model container [2020-11-22 13:09:03,630 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 01:09:03" (3/3) ... [2020-11-22 13:09:03,631 INFO L111 eAbstractionObserver]: Analyzing ICFG list_flag-1.i [2020-11-22 13:09:03,680 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-22 13:09:03,695 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-22 13:09:03,709 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-22 13:09:03,745 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-22 13:09:03,748 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-22 13:09:03,748 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-22 13:09:03,748 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-22 13:09:03,748 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-22 13:09:03,748 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-22 13:09:03,749 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-22 13:09:03,749 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-22 13:09:03,768 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-11-22 13:09:03,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-11-22 13:09:03,775 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:09:03,775 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-22 13:09:03,776 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:09:03,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:09:03,783 INFO L82 PathProgramCache]: Analyzing trace with hash -792149495, now seen corresponding path program 1 times [2020-11-22 13:09:03,792 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:09:03,792 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [653710060] [2020-11-22 13:09:03,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:09:03,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:09:03,931 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:09:03,932 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [653710060] [2020-11-22 13:09:03,932 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-22 13:09:03,933 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-11-22 13:09:03,933 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [78802417] [2020-11-22 13:09:03,937 INFO L461 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-11-22 13:09:03,938 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:09:03,950 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-11-22 13:09:03,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-11-22 13:09:03,953 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2020-11-22 13:09:03,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:09:03,968 INFO L93 Difference]: Finished difference Result 34 states and 50 transitions. [2020-11-22 13:09:03,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-11-22 13:09:03,969 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-11-22 13:09:03,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:09:03,976 INFO L225 Difference]: With dead ends: 34 [2020-11-22 13:09:03,976 INFO L226 Difference]: Without dead ends: 16 [2020-11-22 13:09:03,979 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-11-22 13:09:03,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-11-22 13:09:04,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-11-22 13:09:04,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-11-22 13:09:04,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2020-11-22 13:09:04,008 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 10 [2020-11-22 13:09:04,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:09:04,008 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2020-11-22 13:09:04,009 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-11-22 13:09:04,009 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2020-11-22 13:09:04,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-11-22 13:09:04,009 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:09:04,010 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-22 13:09:04,010 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-22 13:09:04,010 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:09:04,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:09:04,011 INFO L82 PathProgramCache]: Analyzing trace with hash -1071970925, now seen corresponding path program 1 times [2020-11-22 13:09:04,011 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:09:04,012 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1204301587] [2020-11-22 13:09:04,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:09:04,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:09:04,131 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:09:04,132 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1204301587] [2020-11-22 13:09:04,132 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-22 13:09:04,132 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-11-22 13:09:04,132 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [743287551] [2020-11-22 13:09:04,133 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-11-22 13:09:04,134 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:09:04,134 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-11-22 13:09:04,135 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-11-22 13:09:04,135 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand 5 states. [2020-11-22 13:09:04,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:09:04,261 INFO L93 Difference]: Finished difference Result 39 states and 46 transitions. [2020-11-22 13:09:04,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-22 13:09:04,262 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-11-22 13:09:04,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:09:04,263 INFO L225 Difference]: With dead ends: 39 [2020-11-22 13:09:04,263 INFO L226 Difference]: Without dead ends: 34 [2020-11-22 13:09:04,264 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-11-22 13:09:04,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-11-22 13:09:04,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 24. [2020-11-22 13:09:04,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-11-22 13:09:04,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2020-11-22 13:09:04,272 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 12 [2020-11-22 13:09:04,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:09:04,272 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2020-11-22 13:09:04,272 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-11-22 13:09:04,272 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2020-11-22 13:09:04,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-11-22 13:09:04,274 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:09:04,275 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-22 13:09:04,275 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-22 13:09:04,276 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:09:04,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:09:04,280 INFO L82 PathProgramCache]: Analyzing trace with hash 2118371224, now seen corresponding path program 1 times [2020-11-22 13:09:04,280 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:09:04,280 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [94208870] [2020-11-22 13:09:04,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:09:04,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:09:04,377 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:09:04,377 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [94208870] [2020-11-22 13:09:04,378 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-22 13:09:04,378 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-11-22 13:09:04,378 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [911338892] [2020-11-22 13:09:04,378 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-11-22 13:09:04,379 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:09:04,379 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-11-22 13:09:04,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-11-22 13:09:04,380 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand 5 states. [2020-11-22 13:09:04,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:09:04,477 INFO L93 Difference]: Finished difference Result 41 states and 47 transitions. [2020-11-22 13:09:04,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-22 13:09:04,478 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-11-22 13:09:04,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:09:04,479 INFO L225 Difference]: With dead ends: 41 [2020-11-22 13:09:04,479 INFO L226 Difference]: Without dead ends: 32 [2020-11-22 13:09:04,480 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-11-22 13:09:04,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-11-22 13:09:04,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 22. [2020-11-22 13:09:04,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-11-22 13:09:04,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2020-11-22 13:09:04,488 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 14 [2020-11-22 13:09:04,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:09:04,488 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2020-11-22 13:09:04,489 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-11-22 13:09:04,489 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2020-11-22 13:09:04,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-11-22 13:09:04,490 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:09:04,490 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-22 13:09:04,490 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-11-22 13:09:04,491 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:09:04,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:09:04,491 INFO L82 PathProgramCache]: Analyzing trace with hash -2077877559, now seen corresponding path program 1 times [2020-11-22 13:09:04,492 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:09:04,492 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1301485664] [2020-11-22 13:09:04,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:09:04,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:09:04,565 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:09:04,565 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1301485664] [2020-11-22 13:09:04,566 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-22 13:09:04,566 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-11-22 13:09:04,566 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [710709628] [2020-11-22 13:09:04,566 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-11-22 13:09:04,567 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:09:04,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-11-22 13:09:04,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-11-22 13:09:04,568 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand 5 states. [2020-11-22 13:09:04,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:09:04,666 INFO L93 Difference]: Finished difference Result 39 states and 44 transitions. [2020-11-22 13:09:04,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-22 13:09:04,666 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-11-22 13:09:04,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:09:04,667 INFO L225 Difference]: With dead ends: 39 [2020-11-22 13:09:04,667 INFO L226 Difference]: Without dead ends: 28 [2020-11-22 13:09:04,668 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-11-22 13:09:04,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-11-22 13:09:04,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 18. [2020-11-22 13:09:04,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-11-22 13:09:04,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 21 transitions. [2020-11-22 13:09:04,671 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 21 transitions. Word has length 14 [2020-11-22 13:09:04,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:09:04,671 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 21 transitions. [2020-11-22 13:09:04,671 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-11-22 13:09:04,671 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 21 transitions. [2020-11-22 13:09:04,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-11-22 13:09:04,672 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:09:04,672 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-22 13:09:04,672 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-11-22 13:09:04,672 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:09:04,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:09:04,678 INFO L82 PathProgramCache]: Analyzing trace with hash -2105567943, now seen corresponding path program 1 times [2020-11-22 13:09:04,679 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:09:04,679 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [800318184] [2020-11-22 13:09:04,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:09:04,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-22 13:09:04,740 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-22 13:09:04,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-22 13:09:04,764 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-22 13:09:04,796 INFO L173 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2020-11-22 13:09:04,797 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-22 13:09:04,797 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-11-22 13:09:04,847 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.11 01:09:04 BoogieIcfgContainer [2020-11-22 13:09:04,847 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-22 13:09:04,848 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-22 13:09:04,848 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-22 13:09:04,848 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-22 13:09:04,848 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 01:09:03" (3/4) ... [2020-11-22 13:09:04,850 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-11-22 13:09:04,891 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_632cb24d-24c1-4840-9e3a-6c3ae2ff5096/bin/utaipan/witness.graphml [2020-11-22 13:09:04,894 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-22 13:09:04,897 INFO L168 Benchmark]: Toolchain (without parser) took 2589.59 ms. Allocated memory was 81.8 MB in the beginning and 98.6 MB in the end (delta: 16.8 MB). Free memory was 47.0 MB in the beginning and 52.9 MB in the end (delta: -5.9 MB). Peak memory consumption was 9.0 MB. Max. memory is 16.1 GB. [2020-11-22 13:09:04,898 INFO L168 Benchmark]: CDTParser took 0.27 ms. Allocated memory is still 81.8 MB. Free memory was 54.1 MB in the beginning and 54.0 MB in the end (delta: 21.8 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-22 13:09:04,898 INFO L168 Benchmark]: CACSL2BoogieTranslator took 635.52 ms. Allocated memory was 81.8 MB in the beginning and 98.6 MB in the end (delta: 16.8 MB). Free memory was 46.7 MB in the beginning and 64.0 MB in the end (delta: -17.3 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2020-11-22 13:09:04,899 INFO L168 Benchmark]: Boogie Procedure Inliner took 74.46 ms. Allocated memory is still 98.6 MB. Free memory was 64.0 MB in the beginning and 61.9 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-22 13:09:04,900 INFO L168 Benchmark]: Boogie Preprocessor took 26.10 ms. Allocated memory is still 98.6 MB. Free memory was 61.9 MB in the beginning and 60.5 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-22 13:09:04,901 INFO L168 Benchmark]: RCFGBuilder took 578.10 ms. Allocated memory is still 98.6 MB. Free memory was 60.5 MB in the beginning and 36.3 MB in the end (delta: 24.2 MB). Peak memory consumption was 25.2 MB. Max. memory is 16.1 GB. [2020-11-22 13:09:04,905 INFO L168 Benchmark]: TraceAbstraction took 1222.04 ms. Allocated memory is still 98.6 MB. Free memory was 35.8 MB in the beginning and 55.6 MB in the end (delta: -19.8 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-22 13:09:04,905 INFO L168 Benchmark]: Witness Printer took 46.83 ms. Allocated memory is still 98.6 MB. Free memory was 55.6 MB in the beginning and 52.9 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-22 13:09:04,908 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27 ms. Allocated memory is still 81.8 MB. Free memory was 54.1 MB in the beginning and 54.0 MB in the end (delta: 21.8 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 635.52 ms. Allocated memory was 81.8 MB in the beginning and 98.6 MB in the end (delta: 16.8 MB). Free memory was 46.7 MB in the beginning and 64.0 MB in the end (delta: -17.3 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 74.46 ms. Allocated memory is still 98.6 MB. Free memory was 64.0 MB in the beginning and 61.9 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 26.10 ms. Allocated memory is still 98.6 MB. Free memory was 61.9 MB in the beginning and 60.5 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 578.10 ms. Allocated memory is still 98.6 MB. Free memory was 60.5 MB in the beginning and 36.3 MB in the end (delta: 24.2 MB). Peak memory consumption was 25.2 MB. Max. memory is 16.1 GB. * TraceAbstraction took 1222.04 ms. Allocated memory is still 98.6 MB. Free memory was 35.8 MB in the beginning and 55.6 MB in the end (delta: -19.8 MB). There was no memory consumed. Max. memory is 16.1 GB. * Witness Printer took 46.83 ms. Allocated memory is still 98.6 MB. Free memory was 55.6 MB in the beginning and 52.9 MB in the end (delta: 2.7 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: 12]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L532] int flag = __VERIFIER_nondet_int(); [L533] List p, a, t; [L534] a = (List) malloc(sizeof(struct node)) [L535] COND FALSE !(a == 0) [L536] p = a [L537] COND TRUE __VERIFIER_nondet_int() [L538] COND FALSE !(\read(flag)) [L541] p->h = 2 [L543] t = (List) malloc(sizeof(struct node)) [L544] COND FALSE !(t == 0) [L545] p->n = t [L546] EXPR p->n [L546] p = p->n [L537] COND FALSE !(__VERIFIER_nondet_int()) [L548] p->h = 3 [L549] p = a [L550] COND FALSE !(\read(flag)) [L554] EXPR p->h [L554] COND FALSE !(p->h == 1) [L556] EXPR p->h [L556] COND TRUE p->h != 3 [L12] COND FALSE !(0) [L12] __assert_fail ("0", "list_flag-1.c", 3, __extension__ __PRETTY_FUNCTION__) - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 21 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.0s, OverallIterations: 5, TraceHistogramMax: 2, AutomataDifference: 0.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 66 SDtfs, 54 SDslu, 91 SDs, 0 SdLazy, 115 SolverSat, 6 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 23 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=24occurred in iteration=2, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 4 MinimizatonAttempts, 30 StatesRemovedByMinimization, 3 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.2s InterpolantComputationTime, 65 NumberOfCodeBlocks, 65 NumberOfCodeBlocksAsserted, 5 NumberOfCheckSat, 46 ConstructedInterpolants, 0 QuantifiedInterpolants, 1856 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 4 InterpolantComputations, 4 PerfectInterpolantSequences, 4/4 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...