./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/list-ext2-properties/simple_and_skiplist_2lvl-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_a454428c-5960-4f9a-9578-6f2cef335dc2/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_a454428c-5960-4f9a-9578-6f2cef335dc2/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_a454428c-5960-4f9a-9578-6f2cef335dc2/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_a454428c-5960-4f9a-9578-6f2cef335dc2/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/list-ext2-properties/simple_and_skiplist_2lvl-1.i -s /tmp/vcloud-vcloud-master/worker/run_dir_a454428c-5960-4f9a-9578-6f2cef335dc2/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_a454428c-5960-4f9a-9578-6f2cef335dc2/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 997512b29ff7fdf1190aebf9d039045a1841d533 ..................................................................................................................................................................................................................................................................................................................................................................................................................................... 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 13:00:23,628 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-22 13:00:23,630 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-22 13:00:23,686 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-22 13:00:23,687 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-22 13:00:23,688 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-22 13:00:23,690 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-22 13:00:23,692 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-22 13:00:23,694 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-22 13:00:23,696 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-22 13:00:23,697 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-22 13:00:23,698 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-22 13:00:23,699 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-22 13:00:23,700 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-22 13:00:23,701 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-22 13:00:23,703 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-22 13:00:23,704 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-22 13:00:23,705 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-22 13:00:23,707 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-22 13:00:23,734 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-22 13:00:23,737 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-22 13:00:23,741 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-22 13:00:23,742 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-22 13:00:23,743 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-22 13:00:23,747 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-22 13:00:23,747 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-22 13:00:23,747 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-22 13:00:23,759 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-22 13:00:23,760 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-22 13:00:23,761 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-22 13:00:23,761 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-22 13:00:23,762 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-22 13:00:23,764 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-22 13:00:23,765 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-22 13:00:23,766 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-22 13:00:23,767 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-22 13:00:23,767 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-22 13:00:23,768 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-22 13:00:23,768 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-22 13:00:23,771 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-22 13:00:23,771 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-22 13:00:23,775 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_a454428c-5960-4f9a-9578-6f2cef335dc2/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-11-22 13:00:23,818 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-22 13:00:23,818 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-22 13:00:23,819 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-11-22 13:00:23,820 INFO L138 SettingsManager]: * User list type=DISABLED [2020-11-22 13:00:23,820 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-11-22 13:00:23,820 INFO L138 SettingsManager]: * Explicit value domain=true [2020-11-22 13:00:23,820 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-11-22 13:00:23,820 INFO L138 SettingsManager]: * Octagon Domain=false [2020-11-22 13:00:23,820 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-11-22 13:00:23,821 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-11-22 13:00:23,822 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-11-22 13:00:23,822 INFO L138 SettingsManager]: * Interval Domain=false [2020-11-22 13:00:23,822 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-11-22 13:00:23,822 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-11-22 13:00:23,822 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-11-22 13:00:23,823 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-22 13:00:23,823 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-22 13:00:23,823 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-22 13:00:23,824 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-22 13:00:23,824 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-22 13:00:23,824 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-22 13:00:23,824 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-22 13:00:23,824 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-22 13:00:23,824 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-11-22 13:00:23,825 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-22 13:00:23,825 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-22 13:00:23,825 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-22 13:00:23,825 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-22 13:00:23,825 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-22 13:00:23,827 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-22 13:00:23,827 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-22 13:00:23,827 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-22 13:00:23,828 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-22 13:00:23,828 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-22 13:00:23,828 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-22 13:00:23,828 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-11-22 13:00:23,828 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-22 13:00:23,828 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-22 13:00:23,829 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-22 13:00:23,829 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-11-22 13:00:23,829 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_a454428c-5960-4f9a-9578-6f2cef335dc2/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_a454428c-5960-4f9a-9578-6f2cef335dc2/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 997512b29ff7fdf1190aebf9d039045a1841d533 [2020-11-22 13:00:24,132 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-22 13:00:24,172 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-22 13:00:24,174 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-22 13:00:24,193 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-22 13:00:24,194 INFO L275 PluginConnector]: CDTParser initialized [2020-11-22 13:00:24,195 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_a454428c-5960-4f9a-9578-6f2cef335dc2/bin/utaipan/../../sv-benchmarks/c/list-ext2-properties/simple_and_skiplist_2lvl-1.i [2020-11-22 13:00:24,266 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_a454428c-5960-4f9a-9578-6f2cef335dc2/bin/utaipan/data/afee33023/59904ad47c044748a92ab08da01d878e/FLAGdb317b15f [2020-11-22 13:00:24,890 INFO L306 CDTParser]: Found 1 translation units. [2020-11-22 13:00:24,894 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_a454428c-5960-4f9a-9578-6f2cef335dc2/sv-benchmarks/c/list-ext2-properties/simple_and_skiplist_2lvl-1.i [2020-11-22 13:00:24,920 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_a454428c-5960-4f9a-9578-6f2cef335dc2/bin/utaipan/data/afee33023/59904ad47c044748a92ab08da01d878e/FLAGdb317b15f [2020-11-22 13:00:25,156 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_a454428c-5960-4f9a-9578-6f2cef335dc2/bin/utaipan/data/afee33023/59904ad47c044748a92ab08da01d878e [2020-11-22 13:00:25,158 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-22 13:00:25,160 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-22 13:00:25,162 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-22 13:00:25,162 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-22 13:00:25,165 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-22 13:00:25,166 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 01:00:25" (1/1) ... [2020-11-22 13:00:25,168 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7d0e5707 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:00:25, skipping insertion in model container [2020-11-22 13:00:25,168 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 01:00:25" (1/1) ... [2020-11-22 13:00:25,175 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-22 13:00:25,208 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-22 13:00:25,575 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-22 13:00:25,587 INFO L203 MainTranslator]: Completed pre-run [2020-11-22 13:00:25,643 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-22 13:00:25,701 INFO L208 MainTranslator]: Completed translation [2020-11-22 13:00:25,701 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:00:25 WrapperNode [2020-11-22 13:00:25,701 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-22 13:00:25,703 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-22 13:00:25,703 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-22 13:00:25,703 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-22 13:00:25,710 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:00:25" (1/1) ... [2020-11-22 13:00:25,725 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:00:25" (1/1) ... [2020-11-22 13:00:25,755 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-22 13:00:25,756 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-22 13:00:25,756 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-22 13:00:25,756 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-22 13:00:25,764 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:00:25" (1/1) ... [2020-11-22 13:00:25,765 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:00:25" (1/1) ... [2020-11-22 13:00:25,769 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:00:25" (1/1) ... [2020-11-22 13:00:25,770 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:00:25" (1/1) ... [2020-11-22 13:00:25,781 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:00:25" (1/1) ... [2020-11-22 13:00:25,786 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:00:25" (1/1) ... [2020-11-22 13:00:25,789 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:00:25" (1/1) ... [2020-11-22 13:00:25,793 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-22 13:00:25,794 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-22 13:00:25,794 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-22 13:00:25,794 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-22 13:00:25,803 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:00:25" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_a454428c-5960-4f9a-9578-6f2cef335dc2/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 13:00:25,861 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-11-22 13:00:25,861 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-11-22 13:00:25,861 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-11-22 13:00:25,861 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-11-22 13:00:25,861 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-22 13:00:25,861 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-11-22 13:00:25,862 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-22 13:00:25,862 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-22 13:00:25,862 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-22 13:00:25,862 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-22 13:00:26,848 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-22 13:00:26,849 INFO L298 CfgBuilder]: Removed 22 assume(true) statements. [2020-11-22 13:00:26,851 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 01:00:26 BoogieIcfgContainer [2020-11-22 13:00:26,852 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-22 13:00:26,853 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-22 13:00:26,853 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-22 13:00:26,856 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-22 13:00:26,857 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 01:00:25" (1/3) ... [2020-11-22 13:00:26,857 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2c09ca7d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 01:00:26, skipping insertion in model container [2020-11-22 13:00:26,858 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:00:25" (2/3) ... [2020-11-22 13:00:26,858 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2c09ca7d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 01:00:26, skipping insertion in model container [2020-11-22 13:00:26,858 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 01:00:26" (3/3) ... [2020-11-22 13:00:26,860 INFO L111 eAbstractionObserver]: Analyzing ICFG simple_and_skiplist_2lvl-1.i [2020-11-22 13:00:26,870 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-22 13:00:26,874 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-22 13:00:26,886 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-22 13:00:26,908 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-22 13:00:26,908 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-22 13:00:26,908 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-22 13:00:26,909 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-22 13:00:26,909 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-22 13:00:26,909 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-22 13:00:26,909 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-22 13:00:26,909 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-22 13:00:26,921 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2020-11-22 13:00:26,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-11-22 13:00:26,926 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:00:26,927 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-11-22 13:00:26,927 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:00:26,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:00:26,933 INFO L82 PathProgramCache]: Analyzing trace with hash 934257844, now seen corresponding path program 1 times [2020-11-22 13:00:26,942 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:00:26,943 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [519334009] [2020-11-22 13:00:26,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:00:27,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:00:27,073 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 13:00:27,074 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [519334009] [2020-11-22 13:00:27,074 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-22 13:00:27,075 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-11-22 13:00:27,075 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1075963106] [2020-11-22 13:00:27,079 INFO L461 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-11-22 13:00:27,080 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:00:27,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-11-22 13:00:27,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-11-22 13:00:27,094 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 2 states. [2020-11-22 13:00:27,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:00:27,110 INFO L93 Difference]: Finished difference Result 48 states and 72 transitions. [2020-11-22 13:00:27,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-11-22 13:00:27,112 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 8 [2020-11-22 13:00:27,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:00:27,119 INFO L225 Difference]: With dead ends: 48 [2020-11-22 13:00:27,119 INFO L226 Difference]: Without dead ends: 12 [2020-11-22 13:00:27,122 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 13:00:27,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-11-22 13:00:27,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-11-22 13:00:27,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-11-22 13:00:27,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2020-11-22 13:00:27,150 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 8 [2020-11-22 13:00:27,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:00:27,151 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2020-11-22 13:00:27,151 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-11-22 13:00:27,151 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2020-11-22 13:00:27,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-11-22 13:00:27,152 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:00:27,152 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-22 13:00:27,152 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-22 13:00:27,152 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:00:27,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:00:27,153 INFO L82 PathProgramCache]: Analyzing trace with hash -1942818417, now seen corresponding path program 1 times [2020-11-22 13:00:27,153 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:00:27,154 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1444760984] [2020-11-22 13:00:27,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:00:27,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:00:27,295 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 13:00:27,295 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1444760984] [2020-11-22 13:00:27,295 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-22 13:00:27,296 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-11-22 13:00:27,296 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1934567937] [2020-11-22 13:00:27,297 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-11-22 13:00:27,297 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:00:27,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-11-22 13:00:27,298 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-11-22 13:00:27,299 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand 5 states. [2020-11-22 13:00:27,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:00:27,414 INFO L93 Difference]: Finished difference Result 28 states and 30 transitions. [2020-11-22 13:00:27,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-22 13:00:27,415 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 9 [2020-11-22 13:00:27,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:00:27,416 INFO L225 Difference]: With dead ends: 28 [2020-11-22 13:00:27,417 INFO L226 Difference]: Without dead ends: 25 [2020-11-22 13:00:27,417 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 13:00:27,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-11-22 13:00:27,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 17. [2020-11-22 13:00:27,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-11-22 13:00:27,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-11-22 13:00:27,423 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 9 [2020-11-22 13:00:27,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:00:27,423 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-11-22 13:00:27,423 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-11-22 13:00:27,423 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-11-22 13:00:27,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-11-22 13:00:27,424 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:00:27,424 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-22 13:00:27,425 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-22 13:00:27,425 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:00:27,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:00:27,426 INFO L82 PathProgramCache]: Analyzing trace with hash 2000969792, now seen corresponding path program 1 times [2020-11-22 13:00:27,426 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:00:27,426 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1288597600] [2020-11-22 13:00:27,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:00:27,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:00:27,616 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:00:27,617 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1288597600] [2020-11-22 13:00:27,617 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [321390022] [2020-11-22 13:00:27,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_a454428c-5960-4f9a-9578-6f2cef335dc2/bin/utaipan/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-22 13:00:27,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:00:27,694 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 19 conjunts are in the unsatisfiable core [2020-11-22 13:00:27,700 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 13:00:27,763 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2020-11-22 13:00:27,764 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-22 13:00:27,775 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-22 13:00:27,779 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2020-11-22 13:00:27,779 INFO L545 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2020-11-22 13:00:27,786 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-22 13:00:27,786 INFO L545 ElimStorePlain]: Start of recursive call 1: 2 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-22 13:00:27,787 INFO L244 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:26, output treesize:18 [2020-11-22 13:00:27,826 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2020-11-22 13:00:27,826 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-11-22 13:00:27,837 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-22 13:00:27,840 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2020-11-22 13:00:27,840 INFO L545 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2020-11-22 13:00:27,847 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-11-22 13:00:27,847 INFO L545 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-11-22 13:00:27,847 INFO L244 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:29, output treesize:7 [2020-11-22 13:00:27,849 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:00:27,849 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 13:00:27,901 INFO L384 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 29 [2020-11-22 13:00:27,908 INFO L545 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2020-11-22 13:00:27,920 INFO L625 ElimStorePlain]: treesize reduction 19, result has 36.7 percent of original size [2020-11-22 13:00:27,921 INFO L513 ElimStorePlain]: Eliminatee |v_#memory_$Pointer$.base_59| vanished before elimination [2020-11-22 13:00:27,921 INFO L545 ElimStorePlain]: Start of recursive call 1: 2 dim-2 vars, End of recursive call: and 2 xjuncts. [2020-11-22 13:00:27,921 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:11 [2020-11-22 13:00:27,936 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:00:27,936 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [374561484] [2020-11-22 13:00:27,956 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2020-11-22 13:00:27,956 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 13:00:27,963 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-22 13:00:27,968 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-22 13:00:27,969 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-22 13:00:28,200 WARN L234 Elim1Store]: Array PQE input equivalent to false [2020-11-22 13:00:28,652 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-22 13:00:28,843 WARN L193 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 52 [2020-11-22 13:00:29,088 WARN L193 SmtUtils]: Spent 218.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 59 [2020-11-22 13:00:29,292 WARN L193 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 65 [2020-11-22 13:00:29,952 WARN L193 SmtUtils]: Spent 594.00 ms on a formula simplification. DAG size of input: 97 DAG size of output: 77 [2020-11-22 13:00:30,369 WARN L193 SmtUtils]: Spent 357.00 ms on a formula simplification. DAG size of input: 106 DAG size of output: 77 [2020-11-22 13:00:30,734 WARN L193 SmtUtils]: Spent 289.00 ms on a formula simplification. DAG size of input: 105 DAG size of output: 73 [2020-11-22 13:00:30,736 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2020-11-22 13:00:30,736 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [5, 5, 5] total 14 [2020-11-22 13:00:30,737 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1483041972] [2020-11-22 13:00:30,737 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-11-22 13:00:30,738 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:00:30,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-11-22 13:00:30,739 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=125, Unknown=0, NotChecked=0, Total=182 [2020-11-22 13:00:30,739 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 8 states. [2020-11-22 13:00:30,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:00:30,856 INFO L93 Difference]: Finished difference Result 24 states and 26 transitions. [2020-11-22 13:00:30,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-11-22 13:00:30,857 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 12 [2020-11-22 13:00:30,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:00:30,858 INFO L225 Difference]: With dead ends: 24 [2020-11-22 13:00:30,858 INFO L226 Difference]: Without dead ends: 15 [2020-11-22 13:00:30,859 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=57, Invalid=125, Unknown=0, NotChecked=0, Total=182 [2020-11-22 13:00:30,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-11-22 13:00:30,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 14. [2020-11-22 13:00:30,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-11-22 13:00:30,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2020-11-22 13:00:30,862 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 12 [2020-11-22 13:00:30,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:00:30,862 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2020-11-22 13:00:30,863 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-11-22 13:00:30,863 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2020-11-22 13:00:30,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-11-22 13:00:30,863 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:00:30,863 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-22 13:00:31,076 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-11-22 13:00:31,076 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:00:31,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:00:31,077 INFO L82 PathProgramCache]: Analyzing trace with hash -1376860324, now seen corresponding path program 1 times [2020-11-22 13:00:31,077 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:00:31,077 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1056695718] [2020-11-22 13:00:31,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:00:31,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-22 13:00:31,113 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-22 13:00:31,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-22 13:00:31,144 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-22 13:00:31,171 INFO L173 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2020-11-22 13:00:31,171 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-22 13:00:31,171 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-11-22 13:00:31,214 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.11 01:00:31 BoogieIcfgContainer [2020-11-22 13:00:31,215 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-22 13:00:31,215 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-22 13:00:31,215 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-22 13:00:31,215 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-22 13:00:31,216 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 01:00:26" (3/4) ... [2020-11-22 13:00:31,217 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-11-22 13:00:31,254 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_a454428c-5960-4f9a-9578-6f2cef335dc2/bin/utaipan/witness.graphml [2020-11-22 13:00:31,255 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-22 13:00:31,256 INFO L168 Benchmark]: Toolchain (without parser) took 6095.57 ms. Allocated memory was 100.7 MB in the beginning and 188.7 MB in the end (delta: 88.1 MB). Free memory was 66.4 MB in the beginning and 123.9 MB in the end (delta: -57.4 MB). Peak memory consumption was 30.3 MB. Max. memory is 16.1 GB. [2020-11-22 13:00:31,257 INFO L168 Benchmark]: CDTParser took 0.18 ms. Allocated memory is still 100.7 MB. Free memory was 75.3 MB in the beginning and 75.3 MB in the end (delta: 25.3 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-22 13:00:31,257 INFO L168 Benchmark]: CACSL2BoogieTranslator took 540.10 ms. Allocated memory is still 100.7 MB. Free memory was 66.3 MB in the beginning and 63.7 MB in the end (delta: 2.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2020-11-22 13:00:31,258 INFO L168 Benchmark]: Boogie Procedure Inliner took 53.07 ms. Allocated memory is still 100.7 MB. Free memory was 63.7 MB in the beginning and 61.3 MB in the end (delta: 2.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-22 13:00:31,258 INFO L168 Benchmark]: Boogie Preprocessor took 36.74 ms. Allocated memory is still 100.7 MB. Free memory was 61.3 MB in the beginning and 59.2 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-22 13:00:31,259 INFO L168 Benchmark]: RCFGBuilder took 1058.10 ms. Allocated memory is still 100.7 MB. Free memory was 59.2 MB in the beginning and 51.1 MB in the end (delta: 8.1 MB). Peak memory consumption was 27.8 MB. Max. memory is 16.1 GB. [2020-11-22 13:00:31,259 INFO L168 Benchmark]: TraceAbstraction took 4361.54 ms. Allocated memory was 100.7 MB in the beginning and 188.7 MB in the end (delta: 88.1 MB). Free memory was 50.5 MB in the beginning and 126.1 MB in the end (delta: -75.6 MB). Peak memory consumption was 13.4 MB. Max. memory is 16.1 GB. [2020-11-22 13:00:31,260 INFO L168 Benchmark]: Witness Printer took 39.68 ms. Allocated memory is still 188.7 MB. Free memory was 126.1 MB in the beginning and 123.9 MB in the end (delta: 2.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-22 13:00:31,263 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18 ms. Allocated memory is still 100.7 MB. Free memory was 75.3 MB in the beginning and 75.3 MB in the end (delta: 25.3 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 540.10 ms. Allocated memory is still 100.7 MB. Free memory was 66.3 MB in the beginning and 63.7 MB in the end (delta: 2.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 53.07 ms. Allocated memory is still 100.7 MB. Free memory was 63.7 MB in the beginning and 61.3 MB in the end (delta: 2.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 36.74 ms. Allocated memory is still 100.7 MB. Free memory was 61.3 MB in the beginning and 59.2 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 1058.10 ms. Allocated memory is still 100.7 MB. Free memory was 59.2 MB in the beginning and 51.1 MB in the end (delta: 8.1 MB). Peak memory consumption was 27.8 MB. Max. memory is 16.1 GB. * TraceAbstraction took 4361.54 ms. Allocated memory was 100.7 MB in the beginning and 188.7 MB in the end (delta: 88.1 MB). Free memory was 50.5 MB in the beginning and 126.1 MB in the end (delta: -75.6 MB). Peak memory consumption was 13.4 MB. Max. memory is 16.1 GB. * Witness Printer took 39.68 ms. Allocated memory is still 188.7 MB. Free memory was 126.1 MB in the beginning and 123.9 MB in the end (delta: 2.2 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: [L596] List a = (List) malloc(sizeof(struct node)); [L597] COND FALSE !(a == 0) [L598] List t; [L599] List p = a; [L600] a->h = 2 [L601] COND TRUE __VERIFIER_nondet_int() [L602] p->h = 1 [L603] t = (List) malloc(sizeof(struct node)) [L604] COND FALSE !(t == 0) [L605] p->n = t [L606] EXPR p->n [L606] p = p->n [L601] COND FALSE !(__VERIFIER_nondet_int()) [L608] p->h = 2 [L609] p->n = 0 [L610] p = a [L611] COND TRUE p!=0 [L612] EXPR p->h [L612] COND TRUE p->h != 2 [L12] COND FALSE !(0) [L12] __assert_fail ("0", "simple_and_skiplist_2lvl-1.c", 3, __extension__ __PRETTY_FUNCTION__) - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 28 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 4.2s, OverallIterations: 4, TraceHistogramMax: 2, AutomataDifference: 0.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 49 SDtfs, 17 SDslu, 31 SDs, 0 SdLazy, 54 SolverSat, 18 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 48 GetRequests, 29 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 2.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=28occurred 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: 0.0s AutomataMinimizationTime, 3 MinimizatonAttempts, 9 StatesRemovedByMinimization, 2 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.5s InterpolantComputationTime, 53 NumberOfCodeBlocks, 53 NumberOfCodeBlocksAsserted, 5 NumberOfCheckSat, 48 ConstructedInterpolants, 0 QuantifiedInterpolants, 3698 SizeOfPredicates, 7 NumberOfNonLiveVariables, 71 ConjunctsInSsa, 19 ConjunctsInUnsatCore, 5 InterpolantComputations, 2 PerfectInterpolantSequences, 3/6 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: OVERALL_TIME[ms]: 697, ICFG_INTERPRETER_ENTERED_PROCEDURES: 1, DAG_INTERPRETER_EARLY_EXIT_QUERIES_NONTRIVIAL: 8, DAG_INTERPRETER_EARLY_EXITS: 1, TOOLS_POST_APPLICATIONS: 14, TOOLS_POST_TIME[ms]: 514, TOOLS_POST_CALL_APPLICATIONS: 0, TOOLS_POST_CALL_TIME[ms]: 0, TOOLS_POST_RETURN_APPLICATIONS: 0, TOOLS_POST_RETURN_TIME[ms]: 0, TOOLS_QUANTIFIERELIM_APPLICATIONS: 14, TOOLS_QUANTIFIERELIM_TIME[ms]: 508, TOOLS_QUANTIFIERELIM_MAX_TIME[ms]: 166, FLUID_QUERY_TIME[ms]: 3, FLUID_QUERIES: 28, FLUID_YES_ANSWERS: 0, DOMAIN_JOIN_APPLICATIONS: 0, DOMAIN_JOIN_TIME[ms]: 0, DOMAIN_ALPHA_APPLICATIONS: 0, DOMAIN_ALPHA_TIME[ms]: 0, DOMAIN_WIDEN_APPLICATIONS: 1, DOMAIN_WIDEN_TIME[ms]: 96, DOMAIN_ISSUBSETEQ_APPLICATIONS: 2, DOMAIN_ISSUBSETEQ_TIME[ms]: 11, DOMAIN_ISBOTTOM_APPLICATIONS: 8, DOMAIN_ISBOTTOM_TIME[ms]: 20, LOOP_SUMMARIZER_APPLICATIONS: 1, LOOP_SUMMARIZER_CACHE_MISSES: 1, LOOP_SUMMARIZER_OVERALL_TIME[ms]: 139, LOOP_SUMMARIZER_NEW_COMPUTATION_TIME[ms]: 138, LOOP_SUMMARIZER_FIXPOINT_ITERATIONS: 2, CALL_SUMMARIZER_APPLICATIONS: 0, CALL_SUMMARIZER_CACHE_MISSES: 0, CALL_SUMMARIZER_OVERALL_TIME[ms]: 0, CALL_SUMMARIZER_NEW_COMPUTATION_TIME[ms]: 0, PROCEDURE_GRAPH_BUILDER_TIME[ms]: 3, PATH_EXPR_TIME[ms]: 3, REGEX_TO_DAG_TIME[ms]: 4, DAG_COMPRESSION_TIME[ms]: 14, DAG_COMPRESSION_PROCESSED_NODES: 79, DAG_COMPRESSION_RETAINED_NODES: 30, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...