./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/list-properties/alternating_list-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 6b5699aa Calling Ultimate with: /usr/lib/jvm/java-8-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_129b7672-3f96-4314-8712-844e36b7be5b/bin/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/run_dir_129b7672-3f96-4314-8712-844e36b7be5b/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_129b7672-3f96-4314-8712-844e36b7be5b/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_129b7672-3f96-4314-8712-844e36b7be5b/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/list-properties/alternating_list-2.i -s /tmp/vcloud-vcloud-master/worker/run_dir_129b7672-3f96-4314-8712-844e36b7be5b/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_129b7672-3f96-4314-8712-844e36b7be5b/bin/utaipan --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 9c54128245d3ab9ad313da188c7be33f66027c6a .................................................................................................................................................................................................................................................................................................................................... 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 0.1.24-6b5699a [2019-11-26 02:27:58,460 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-26 02:27:58,461 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-26 02:27:58,472 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-26 02:27:58,473 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-26 02:27:58,473 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-26 02:27:58,475 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-26 02:27:58,477 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-26 02:27:58,478 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-26 02:27:58,479 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-26 02:27:58,480 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-26 02:27:58,481 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-26 02:27:58,482 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-26 02:27:58,482 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-26 02:27:58,483 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-26 02:27:58,485 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-26 02:27:58,489 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-26 02:27:58,492 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-26 02:27:58,495 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-26 02:27:58,497 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-26 02:27:58,500 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-26 02:27:58,504 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-26 02:27:58,507 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-26 02:27:58,508 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-26 02:27:58,510 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-26 02:27:58,513 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-26 02:27:58,513 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-26 02:27:58,514 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-26 02:27:58,515 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-26 02:27:58,516 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-26 02:27:58,517 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-26 02:27:58,517 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-26 02:27:58,519 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-26 02:27:58,520 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-26 02:27:58,521 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-26 02:27:58,521 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-26 02:27:58,521 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-26 02:27:58,522 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-26 02:27:58,522 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-26 02:27:58,523 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-26 02:27:58,525 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-26 02:27:58,525 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_129b7672-3f96-4314-8712-844e36b7be5b/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2019-11-26 02:27:58,544 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-26 02:27:58,544 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-26 02:27:58,545 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-11-26 02:27:58,546 INFO L138 SettingsManager]: * User list type=DISABLED [2019-11-26 02:27:58,546 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-11-26 02:27:58,546 INFO L138 SettingsManager]: * Explicit value domain=true [2019-11-26 02:27:58,546 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-11-26 02:27:58,546 INFO L138 SettingsManager]: * Octagon Domain=false [2019-11-26 02:27:58,547 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2019-11-26 02:27:58,547 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-11-26 02:27:58,548 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2019-11-26 02:27:58,548 INFO L138 SettingsManager]: * Interval Domain=false [2019-11-26 02:27:58,548 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2019-11-26 02:27:58,548 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2019-11-26 02:27:58,549 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2019-11-26 02:27:58,550 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-26 02:27:58,550 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-26 02:27:58,550 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-26 02:27:58,550 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-26 02:27:58,551 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-26 02:27:58,551 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-26 02:27:58,551 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-26 02:27:58,551 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-26 02:27:58,551 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-26 02:27:58,552 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-26 02:27:58,552 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-26 02:27:58,552 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-26 02:27:58,552 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-26 02:27:58,553 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-26 02:27:58,553 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-26 02:27:58,553 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-26 02:27:58,554 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-26 02:27:58,554 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-26 02:27:58,554 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2019-11-26 02:27:58,554 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-26 02:27:58,555 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-26 02:27:58,555 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-26 02:27:58,555 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_129b7672-3f96-4314-8712-844e36b7be5b/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(__VERIFIER_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 -> 9c54128245d3ab9ad313da188c7be33f66027c6a [2019-11-26 02:27:58,696 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-26 02:27:58,705 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-26 02:27:58,708 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-26 02:27:58,709 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-26 02:27:58,710 INFO L275 PluginConnector]: CDTParser initialized [2019-11-26 02:27:58,710 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_129b7672-3f96-4314-8712-844e36b7be5b/bin/utaipan/../../sv-benchmarks/c/list-properties/alternating_list-2.i [2019-11-26 02:27:58,758 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_129b7672-3f96-4314-8712-844e36b7be5b/bin/utaipan/data/b12c3482e/daa83a4f4f9b4870bbd9acdfed5fab2a/FLAG6731f033d [2019-11-26 02:27:59,194 INFO L306 CDTParser]: Found 1 translation units. [2019-11-26 02:27:59,195 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_129b7672-3f96-4314-8712-844e36b7be5b/sv-benchmarks/c/list-properties/alternating_list-2.i [2019-11-26 02:27:59,205 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_129b7672-3f96-4314-8712-844e36b7be5b/bin/utaipan/data/b12c3482e/daa83a4f4f9b4870bbd9acdfed5fab2a/FLAG6731f033d [2019-11-26 02:27:59,537 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_129b7672-3f96-4314-8712-844e36b7be5b/bin/utaipan/data/b12c3482e/daa83a4f4f9b4870bbd9acdfed5fab2a [2019-11-26 02:27:59,540 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-26 02:27:59,541 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2019-11-26 02:27:59,542 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-26 02:27:59,542 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-26 02:27:59,545 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-26 02:27:59,546 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.11 02:27:59" (1/1) ... [2019-11-26 02:27:59,549 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6fee48d9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:27:59, skipping insertion in model container [2019-11-26 02:27:59,549 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 26.11 02:27:59" (1/1) ... [2019-11-26 02:27:59,556 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-26 02:27:59,605 INFO L179 MainTranslator]: Built tables and reachable declarations [2019-11-26 02:27:59,907 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-26 02:27:59,916 INFO L201 MainTranslator]: Completed pre-run [2019-11-26 02:27:59,991 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-26 02:28:00,044 INFO L205 MainTranslator]: Completed translation [2019-11-26 02:28:00,045 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:28:00 WrapperNode [2019-11-26 02:28:00,045 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-26 02:28:00,046 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-26 02:28:00,046 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-26 02:28:00,046 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-26 02:28:00,054 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:28:00" (1/1) ... [2019-11-26 02:28:00,068 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:28:00" (1/1) ... [2019-11-26 02:28:00,089 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-26 02:28:00,089 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-26 02:28:00,089 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-26 02:28:00,089 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-26 02:28:00,098 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:28:00" (1/1) ... [2019-11-26 02:28:00,098 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:28:00" (1/1) ... [2019-11-26 02:28:00,101 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:28:00" (1/1) ... [2019-11-26 02:28:00,102 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:28:00" (1/1) ... [2019-11-26 02:28:00,108 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:28:00" (1/1) ... [2019-11-26 02:28:00,113 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:28:00" (1/1) ... [2019-11-26 02:28:00,114 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:28:00" (1/1) ... [2019-11-26 02:28:00,117 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-26 02:28:00,118 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-26 02:28:00,118 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-26 02:28:00,118 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-26 02:28:00,119 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:28:00" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_129b7672-3f96-4314-8712-844e36b7be5b/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 [2019-11-26 02:28:00,186 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-26 02:28:00,188 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-26 02:28:00,188 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2019-11-26 02:28:00,189 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2019-11-26 02:28:00,189 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2019-11-26 02:28:00,189 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-26 02:28:00,189 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-26 02:28:00,189 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-26 02:28:00,632 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-26 02:28:00,632 INFO L284 CfgBuilder]: Removed 11 assume(true) statements. [2019-11-26 02:28:00,633 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.11 02:28:00 BoogieIcfgContainer [2019-11-26 02:28:00,633 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-26 02:28:00,634 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-26 02:28:00,634 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-26 02:28:00,637 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-26 02:28:00,637 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 26.11 02:27:59" (1/3) ... [2019-11-26 02:28:00,638 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a34c104 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.11 02:28:00, skipping insertion in model container [2019-11-26 02:28:00,638 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 26.11 02:28:00" (2/3) ... [2019-11-26 02:28:00,638 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a34c104 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 26.11 02:28:00, skipping insertion in model container [2019-11-26 02:28:00,639 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.11 02:28:00" (3/3) ... [2019-11-26 02:28:00,640 INFO L109 eAbstractionObserver]: Analyzing ICFG alternating_list-2.i [2019-11-26 02:28:00,649 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-26 02:28:00,655 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-26 02:28:00,665 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-26 02:28:00,686 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-26 02:28:00,686 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-26 02:28:00,686 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-26 02:28:00,686 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-26 02:28:00,687 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-26 02:28:00,687 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-26 02:28:00,687 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-26 02:28:00,687 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-26 02:28:00,699 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2019-11-26 02:28:00,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2019-11-26 02:28:00,705 INFO L402 BasicCegarLoop]: Found error trace [2019-11-26 02:28:00,705 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-26 02:28:00,706 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-26 02:28:00,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-26 02:28:00,711 INFO L82 PathProgramCache]: Analyzing trace with hash -1343405240, now seen corresponding path program 1 times [2019-11-26 02:28:00,719 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-26 02:28:00,720 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [431499459] [2019-11-26 02:28:00,720 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-26 02:28:00,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-26 02:28:00,836 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-26 02:28:00,836 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [431499459] [2019-11-26 02:28:00,837 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-26 02:28:00,837 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-11-26 02:28:00,837 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1640586446] [2019-11-26 02:28:00,841 INFO L442 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-11-26 02:28:00,842 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-26 02:28:00,853 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-11-26 02:28:00,854 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-11-26 02:28:00,855 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2019-11-26 02:28:00,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-26 02:28:00,867 INFO L93 Difference]: Finished difference Result 37 states and 53 transitions. [2019-11-26 02:28:00,867 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-11-26 02:28:00,869 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 9 [2019-11-26 02:28:00,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-26 02:28:00,875 INFO L225 Difference]: With dead ends: 37 [2019-11-26 02:28:00,876 INFO L226 Difference]: Without dead ends: 14 [2019-11-26 02:28:00,878 INFO L630 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 [2019-11-26 02:28:00,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-11-26 02:28:00,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2019-11-26 02:28:00,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-11-26 02:28:00,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 17 transitions. [2019-11-26 02:28:00,908 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 17 transitions. Word has length 9 [2019-11-26 02:28:00,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-26 02:28:00,908 INFO L462 AbstractCegarLoop]: Abstraction has 14 states and 17 transitions. [2019-11-26 02:28:00,908 INFO L463 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-11-26 02:28:00,908 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 17 transitions. [2019-11-26 02:28:00,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-11-26 02:28:00,909 INFO L402 BasicCegarLoop]: Found error trace [2019-11-26 02:28:00,909 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-26 02:28:00,909 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-26 02:28:00,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-26 02:28:00,910 INFO L82 PathProgramCache]: Analyzing trace with hash 11424206, now seen corresponding path program 1 times [2019-11-26 02:28:00,910 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-26 02:28:00,910 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1101776364] [2019-11-26 02:28:00,911 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-26 02:28:00,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-26 02:28:01,001 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-26 02:28:01,001 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1101776364] [2019-11-26 02:28:01,002 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-26 02:28:01,002 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-11-26 02:28:01,002 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1273113039] [2019-11-26 02:28:01,003 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-26 02:28:01,003 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-26 02:28:01,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-26 02:28:01,003 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-11-26 02:28:01,004 INFO L87 Difference]: Start difference. First operand 14 states and 17 transitions. Second operand 5 states. [2019-11-26 02:28:01,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-26 02:28:01,098 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2019-11-26 02:28:01,098 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-26 02:28:01,098 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2019-11-26 02:28:01,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-26 02:28:01,099 INFO L225 Difference]: With dead ends: 36 [2019-11-26 02:28:01,099 INFO L226 Difference]: Without dead ends: 25 [2019-11-26 02:28:01,100 INFO L630 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 [2019-11-26 02:28:01,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-11-26 02:28:01,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 16. [2019-11-26 02:28:01,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2019-11-26 02:28:01,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2019-11-26 02:28:01,104 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 10 [2019-11-26 02:28:01,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-26 02:28:01,104 INFO L462 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2019-11-26 02:28:01,104 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-26 02:28:01,105 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2019-11-26 02:28:01,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-11-26 02:28:01,105 INFO L402 BasicCegarLoop]: Found error trace [2019-11-26 02:28:01,105 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-26 02:28:01,106 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-26 02:28:01,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-26 02:28:01,106 INFO L82 PathProgramCache]: Analyzing trace with hash 544541488, now seen corresponding path program 1 times [2019-11-26 02:28:01,106 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-26 02:28:01,106 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [521712767] [2019-11-26 02:28:01,107 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-26 02:28:01,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-11-26 02:28:01,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-11-26 02:28:01,191 INFO L174 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2019-11-26 02:28:01,191 INFO L475 BasicCegarLoop]: Counterexample might be feasible [2019-11-26 02:28:01,217 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 26.11 02:28:01 BoogieIcfgContainer [2019-11-26 02:28:01,217 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-11-26 02:28:01,217 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2019-11-26 02:28:01,217 INFO L271 PluginConnector]: Initializing Witness Printer... [2019-11-26 02:28:01,217 INFO L275 PluginConnector]: Witness Printer initialized [2019-11-26 02:28:01,218 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 26.11 02:28:00" (3/4) ... [2019-11-26 02:28:01,220 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2019-11-26 02:28:01,264 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_129b7672-3f96-4314-8712-844e36b7be5b/bin/utaipan/witness.graphml [2019-11-26 02:28:01,264 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2019-11-26 02:28:01,266 INFO L168 Benchmark]: Toolchain (without parser) took 1724.99 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 142.6 MB). Free memory was 938.0 MB in the beginning and 1.0 GB in the end (delta: -106.1 MB). Peak memory consumption was 36.5 MB. Max. memory is 11.5 GB. [2019-11-26 02:28:01,267 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 1.0 GB. Free memory is still 962.2 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-26 02:28:01,267 INFO L168 Benchmark]: CACSL2BoogieTranslator took 503.58 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 142.6 MB). Free memory was 938.0 MB in the beginning and 1.1 GB in the end (delta: -181.7 MB). Peak memory consumption was 18.1 MB. Max. memory is 11.5 GB. [2019-11-26 02:28:01,268 INFO L168 Benchmark]: Boogie Procedure Inliner took 42.99 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-26 02:28:01,268 INFO L168 Benchmark]: Boogie Preprocessor took 28.21 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 5.4 MB). Peak memory consumption was 5.4 MB. Max. memory is 11.5 GB. [2019-11-26 02:28:01,269 INFO L168 Benchmark]: RCFGBuilder took 516.04 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 27.2 MB). Peak memory consumption was 27.2 MB. Max. memory is 11.5 GB. [2019-11-26 02:28:01,269 INFO L168 Benchmark]: TraceAbstraction took 582.56 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.0 GB in the end (delta: 43.0 MB). Peak memory consumption was 43.0 MB. Max. memory is 11.5 GB. [2019-11-26 02:28:01,269 INFO L168 Benchmark]: Witness Printer took 47.55 ms. Allocated memory is still 1.2 GB. Free memory is still 1.0 GB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-26 02:28:01,272 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 1.0 GB. Free memory is still 962.2 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 503.58 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 142.6 MB). Free memory was 938.0 MB in the beginning and 1.1 GB in the end (delta: -181.7 MB). Peak memory consumption was 18.1 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 42.99 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 28.21 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 5.4 MB). Peak memory consumption was 5.4 MB. Max. memory is 11.5 GB. * RCFGBuilder took 516.04 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 27.2 MB). Peak memory consumption was 27.2 MB. Max. memory is 11.5 GB. * TraceAbstraction took 582.56 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.0 GB in the end (delta: 43.0 MB). Peak memory consumption was 43.0 MB. Max. memory is 11.5 GB. * Witness Printer took 47.55 ms. Allocated memory is still 1.2 GB. Free memory is still 1.0 GB. There was no memory consumed. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 562]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L521] int flag = 1; [L522] List a = (List) malloc(sizeof(struct node)); [L523] COND FALSE !(a == 0) [L524] List t; [L525] List p = a; [L526] COND TRUE __VERIFIER_nondet_int() [L527] COND TRUE \read(flag) [L528] p->h = 2 [L529] flag = 0 [L534] t = (List) malloc(sizeof(struct node)) [L535] COND FALSE !(t == 0) [L536] p->n = t [L537] EXPR p->n [L537] p = p->n [L526] COND FALSE !(__VERIFIER_nondet_int()) [L539] p->h = 3 [L540] p = a [L541] flag = 1 [L542] EXPR p->h [L542] COND TRUE p->h != 3 [L543] COND TRUE \read(flag) [L544] flag = 0 [L545] EXPR p->h [L545] COND TRUE p->h != 1 [L562] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 22 locations, 1 error locations. Result: UNSAFE, OverallTime: 0.5s, OverallIterations: 3, TraceHistogramMax: 2, AutomataDifference: 0.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, HoareTripleCheckerStatistics: 38 SDtfs, 12 SDslu, 24 SDs, 0 SdLazy, 32 SolverSat, 2 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=22occurred 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, 2 MinimizatonAttempts, 9 StatesRemovedByMinimization, 1 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.1s InterpolantComputationTime, 32 NumberOfCodeBlocks, 32 NumberOfCodeBlocksAsserted, 3 NumberOfCheckSat, 17 ConstructedInterpolants, 0 QuantifiedInterpolants, 379 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 2 InterpolantComputations, 2 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...