./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/list-properties/list_flag-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version f470102c Calling Ultimate with: /usr/lib/jvm/java-8-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_b769d7b3-0396-45b8-ab00-caa730c982f3/bin/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/run_dir_b769d7b3-0396-45b8-ab00-caa730c982f3/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_b769d7b3-0396-45b8-ab00-caa730c982f3/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_b769d7b3-0396-45b8-ab00-caa730c982f3/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/list-properties/list_flag-1.i -s /tmp/vcloud-vcloud-master/worker/run_dir_b769d7b3-0396-45b8-ab00-caa730c982f3/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_b769d7b3-0396-45b8-ab00-caa730c982f3/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 27e1465127a7716c3a524ea62953f8f9857cdca3 ............................................................................................................................................................................................................................................................................................................................................................................................................. 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 0.1.25-f470102 [2019-12-07 20:47:02,286 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-12-07 20:47:02,287 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-12-07 20:47:02,296 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-12-07 20:47:02,296 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-12-07 20:47:02,297 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-12-07 20:47:02,298 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-12-07 20:47:02,299 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-12-07 20:47:02,301 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-12-07 20:47:02,302 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-12-07 20:47:02,302 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-12-07 20:47:02,303 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-12-07 20:47:02,304 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-12-07 20:47:02,304 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-12-07 20:47:02,305 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-12-07 20:47:02,306 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-12-07 20:47:02,306 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-12-07 20:47:02,307 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-12-07 20:47:02,308 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-12-07 20:47:02,310 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-12-07 20:47:02,311 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-12-07 20:47:02,311 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-12-07 20:47:02,312 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-12-07 20:47:02,312 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-12-07 20:47:02,314 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-12-07 20:47:02,314 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-12-07 20:47:02,314 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-12-07 20:47:02,315 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-12-07 20:47:02,315 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-12-07 20:47:02,316 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-12-07 20:47:02,316 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-12-07 20:47:02,316 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-12-07 20:47:02,316 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-12-07 20:47:02,317 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-12-07 20:47:02,317 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-12-07 20:47:02,318 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-12-07 20:47:02,318 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-12-07 20:47:02,318 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-12-07 20:47:02,318 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-12-07 20:47:02,319 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-12-07 20:47:02,319 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-12-07 20:47:02,320 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_b769d7b3-0396-45b8-ab00-caa730c982f3/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2019-12-07 20:47:02,329 INFO L113 SettingsManager]: Loading preferences was successful [2019-12-07 20:47:02,330 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-12-07 20:47:02,330 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-12-07 20:47:02,330 INFO L138 SettingsManager]: * User list type=DISABLED [2019-12-07 20:47:02,330 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-12-07 20:47:02,331 INFO L138 SettingsManager]: * Explicit value domain=true [2019-12-07 20:47:02,331 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-12-07 20:47:02,331 INFO L138 SettingsManager]: * Octagon Domain=false [2019-12-07 20:47:02,331 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2019-12-07 20:47:02,331 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-12-07 20:47:02,331 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2019-12-07 20:47:02,331 INFO L138 SettingsManager]: * Interval Domain=false [2019-12-07 20:47:02,332 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2019-12-07 20:47:02,332 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2019-12-07 20:47:02,332 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2019-12-07 20:47:02,332 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-12-07 20:47:02,332 INFO L138 SettingsManager]: * sizeof long=4 [2019-12-07 20:47:02,332 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-12-07 20:47:02,333 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-12-07 20:47:02,333 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-12-07 20:47:02,333 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-12-07 20:47:02,333 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-12-07 20:47:02,333 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-12-07 20:47:02,333 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2019-12-07 20:47:02,333 INFO L138 SettingsManager]: * sizeof long double=12 [2019-12-07 20:47:02,333 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-12-07 20:47:02,333 INFO L138 SettingsManager]: * Use constant arrays=true [2019-12-07 20:47:02,334 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-12-07 20:47:02,334 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-12-07 20:47:02,334 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-12-07 20:47:02,334 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-12-07 20:47:02,334 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-12-07 20:47:02,334 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-12-07 20:47:02,334 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-12-07 20:47:02,334 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-12-07 20:47:02,334 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2019-12-07 20:47:02,335 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-12-07 20:47:02,335 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-12-07 20:47:02,335 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2019-12-07 20:47:02,335 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-12-07 20:47:02,335 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_b769d7b3-0396-45b8-ab00-caa730c982f3/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 -> 27e1465127a7716c3a524ea62953f8f9857cdca3 [2019-12-07 20:47:02,440 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-12-07 20:47:02,448 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-12-07 20:47:02,451 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-12-07 20:47:02,452 INFO L271 PluginConnector]: Initializing CDTParser... [2019-12-07 20:47:02,452 INFO L275 PluginConnector]: CDTParser initialized [2019-12-07 20:47:02,452 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_b769d7b3-0396-45b8-ab00-caa730c982f3/bin/utaipan/../../sv-benchmarks/c/list-properties/list_flag-1.i [2019-12-07 20:47:02,493 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_b769d7b3-0396-45b8-ab00-caa730c982f3/bin/utaipan/data/db9b89f94/038de1426d4b4d0a99f39a447c7f10ec/FLAG0f69460fe [2019-12-07 20:47:02,949 INFO L306 CDTParser]: Found 1 translation units. [2019-12-07 20:47:02,949 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_b769d7b3-0396-45b8-ab00-caa730c982f3/sv-benchmarks/c/list-properties/list_flag-1.i [2019-12-07 20:47:02,958 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_b769d7b3-0396-45b8-ab00-caa730c982f3/bin/utaipan/data/db9b89f94/038de1426d4b4d0a99f39a447c7f10ec/FLAG0f69460fe [2019-12-07 20:47:02,967 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_b769d7b3-0396-45b8-ab00-caa730c982f3/bin/utaipan/data/db9b89f94/038de1426d4b4d0a99f39a447c7f10ec [2019-12-07 20:47:02,969 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-12-07 20:47:02,969 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2019-12-07 20:47:02,970 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-12-07 20:47:02,970 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-12-07 20:47:02,972 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-12-07 20:47:02,973 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.12 08:47:02" (1/1) ... [2019-12-07 20:47:02,974 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@a5fed8b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 08:47:02, skipping insertion in model container [2019-12-07 20:47:02,975 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.12 08:47:02" (1/1) ... [2019-12-07 20:47:02,979 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-12-07 20:47:03,010 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-12-07 20:47:03,212 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-12-07 20:47:03,217 INFO L203 MainTranslator]: Completed pre-run [2019-12-07 20:47:03,243 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-12-07 20:47:03,275 INFO L208 MainTranslator]: Completed translation [2019-12-07 20:47:03,276 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 08:47:03 WrapperNode [2019-12-07 20:47:03,276 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-12-07 20:47:03,276 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-12-07 20:47:03,276 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-12-07 20:47:03,276 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-12-07 20:47:03,283 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 08:47:03" (1/1) ... [2019-12-07 20:47:03,293 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 08:47:03" (1/1) ... [2019-12-07 20:47:03,308 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-12-07 20:47:03,308 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-12-07 20:47:03,308 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-12-07 20:47:03,308 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-12-07 20:47:03,314 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 08:47:03" (1/1) ... [2019-12-07 20:47:03,314 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 08:47:03" (1/1) ... [2019-12-07 20:47:03,317 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 08:47:03" (1/1) ... [2019-12-07 20:47:03,317 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 08:47:03" (1/1) ... [2019-12-07 20:47:03,321 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 08:47:03" (1/1) ... [2019-12-07 20:47:03,324 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 08:47:03" (1/1) ... [2019-12-07 20:47:03,325 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 08:47:03" (1/1) ... [2019-12-07 20:47:03,327 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-12-07 20:47:03,327 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-12-07 20:47:03,327 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-12-07 20:47:03,327 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-12-07 20:47:03,328 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 08:47:03" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_b769d7b3-0396-45b8-ab00-caa730c982f3/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 [2019-12-07 20:47:03,369 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-12-07 20:47:03,369 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-12-07 20:47:03,369 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2019-12-07 20:47:03,369 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2019-12-07 20:47:03,369 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2019-12-07 20:47:03,369 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-12-07 20:47:03,369 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-12-07 20:47:03,587 INFO L282 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-12-07 20:47:03,587 INFO L287 CfgBuilder]: Removed 11 assume(true) statements. [2019-12-07 20:47:03,588 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 08:47:03 BoogieIcfgContainer [2019-12-07 20:47:03,588 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-12-07 20:47:03,588 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-12-07 20:47:03,589 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-12-07 20:47:03,590 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-12-07 20:47:03,591 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.12 08:47:02" (1/3) ... [2019-12-07 20:47:03,591 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@54b8c4b1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.12 08:47:03, skipping insertion in model container [2019-12-07 20:47:03,591 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 08:47:03" (2/3) ... [2019-12-07 20:47:03,591 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@54b8c4b1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.12 08:47:03, skipping insertion in model container [2019-12-07 20:47:03,592 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 08:47:03" (3/3) ... [2019-12-07 20:47:03,593 INFO L109 eAbstractionObserver]: Analyzing ICFG list_flag-1.i [2019-12-07 20:47:03,599 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-12-07 20:47:03,604 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-12-07 20:47:03,611 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-12-07 20:47:03,625 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-12-07 20:47:03,625 INFO L374 AbstractCegarLoop]: Hoare is true [2019-12-07 20:47:03,625 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-12-07 20:47:03,625 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-12-07 20:47:03,625 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-12-07 20:47:03,626 INFO L378 AbstractCegarLoop]: Difference is false [2019-12-07 20:47:03,626 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-12-07 20:47:03,626 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-12-07 20:47:03,634 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2019-12-07 20:47:03,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2019-12-07 20:47:03,638 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 20:47:03,639 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 20:47:03,639 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 20:47:03,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 20:47:03,643 INFO L82 PathProgramCache]: Analyzing trace with hash 1738525176, now seen corresponding path program 1 times [2019-12-07 20:47:03,648 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 20:47:03,648 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [383877718] [2019-12-07 20:47:03,649 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 20:47:03,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 20:47:03,732 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 20:47:03,732 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [383877718] [2019-12-07 20:47:03,733 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-07 20:47:03,733 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-12-07 20:47:03,733 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [357572275] [2019-12-07 20:47:03,736 INFO L442 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-12-07 20:47:03,736 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 20:47:03,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-12-07 20:47:03,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-12-07 20:47:03,746 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 2 states. [2019-12-07 20:47:03,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 20:47:03,757 INFO L93 Difference]: Finished difference Result 31 states and 45 transitions. [2019-12-07 20:47:03,757 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-12-07 20:47:03,758 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 9 [2019-12-07 20:47:03,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 20:47:03,764 INFO L225 Difference]: With dead ends: 31 [2019-12-07 20:47:03,764 INFO L226 Difference]: Without dead ends: 15 [2019-12-07 20:47:03,766 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 [2019-12-07 20:47:03,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2019-12-07 20:47:03,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2019-12-07 20:47:03,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-12-07 20:47:03,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2019-12-07 20:47:03,788 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 9 [2019-12-07 20:47:03,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 20:47:03,788 INFO L462 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2019-12-07 20:47:03,788 INFO L463 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-12-07 20:47:03,788 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2019-12-07 20:47:03,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-12-07 20:47:03,788 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 20:47:03,788 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 20:47:03,789 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 20:47:03,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 20:47:03,789 INFO L82 PathProgramCache]: Analyzing trace with hash -296899282, now seen corresponding path program 1 times [2019-12-07 20:47:03,789 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 20:47:03,789 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [126458575] [2019-12-07 20:47:03,789 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 20:47:03,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 20:47:03,839 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 20:47:03,840 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [126458575] [2019-12-07 20:47:03,840 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-07 20:47:03,840 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-12-07 20:47:03,840 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1690999251] [2019-12-07 20:47:03,841 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-12-07 20:47:03,842 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 20:47:03,842 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-12-07 20:47:03,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-12-07 20:47:03,842 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand 5 states. [2019-12-07 20:47:03,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 20:47:03,916 INFO L93 Difference]: Finished difference Result 36 states and 43 transitions. [2019-12-07 20:47:03,917 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-12-07 20:47:03,917 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2019-12-07 20:47:03,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 20:47:03,918 INFO L225 Difference]: With dead ends: 36 [2019-12-07 20:47:03,918 INFO L226 Difference]: Without dead ends: 32 [2019-12-07 20:47:03,919 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 [2019-12-07 20:47:03,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-12-07 20:47:03,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 23. [2019-12-07 20:47:03,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-12-07 20:47:03,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 28 transitions. [2019-12-07 20:47:03,924 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 28 transitions. Word has length 11 [2019-12-07 20:47:03,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 20:47:03,924 INFO L462 AbstractCegarLoop]: Abstraction has 23 states and 28 transitions. [2019-12-07 20:47:03,924 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-12-07 20:47:03,924 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 28 transitions. [2019-12-07 20:47:03,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-12-07 20:47:03,925 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 20:47:03,925 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 20:47:03,925 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 20:47:03,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 20:47:03,926 INFO L82 PathProgramCache]: Analyzing trace with hash -1803692407, now seen corresponding path program 1 times [2019-12-07 20:47:03,926 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 20:47:03,926 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [558291054] [2019-12-07 20:47:03,926 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 20:47:03,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 20:47:03,966 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 20:47:03,966 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [558291054] [2019-12-07 20:47:03,967 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-07 20:47:03,967 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-12-07 20:47:03,967 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [233241163] [2019-12-07 20:47:03,967 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-12-07 20:47:03,967 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 20:47:03,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-12-07 20:47:03,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-12-07 20:47:03,968 INFO L87 Difference]: Start difference. First operand 23 states and 28 transitions. Second operand 5 states. [2019-12-07 20:47:04,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 20:47:04,023 INFO L93 Difference]: Finished difference Result 38 states and 44 transitions. [2019-12-07 20:47:04,023 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-12-07 20:47:04,023 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2019-12-07 20:47:04,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 20:47:04,024 INFO L225 Difference]: With dead ends: 38 [2019-12-07 20:47:04,024 INFO L226 Difference]: Without dead ends: 30 [2019-12-07 20:47:04,025 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 [2019-12-07 20:47:04,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2019-12-07 20:47:04,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 21. [2019-12-07 20:47:04,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-12-07 20:47:04,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2019-12-07 20:47:04,028 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2019-12-07 20:47:04,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 20:47:04,029 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2019-12-07 20:47:04,029 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-12-07 20:47:04,029 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2019-12-07 20:47:04,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-12-07 20:47:04,029 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 20:47:04,029 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 20:47:04,030 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 20:47:04,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 20:47:04,030 INFO L82 PathProgramCache]: Analyzing trace with hash 1247533368, now seen corresponding path program 1 times [2019-12-07 20:47:04,030 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 20:47:04,030 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [159591334] [2019-12-07 20:47:04,031 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 20:47:04,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-12-07 20:47:04,070 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-12-07 20:47:04,070 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [159591334] [2019-12-07 20:47:04,070 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-12-07 20:47:04,070 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-12-07 20:47:04,070 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [804726128] [2019-12-07 20:47:04,071 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-12-07 20:47:04,071 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-12-07 20:47:04,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-12-07 20:47:04,071 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-12-07 20:47:04,071 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2019-12-07 20:47:04,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-12-07 20:47:04,118 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2019-12-07 20:47:04,118 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-12-07 20:47:04,118 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2019-12-07 20:47:04,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-12-07 20:47:04,119 INFO L225 Difference]: With dead ends: 36 [2019-12-07 20:47:04,119 INFO L226 Difference]: Without dead ends: 26 [2019-12-07 20:47:04,119 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 [2019-12-07 20:47:04,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-12-07 20:47:04,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 17. [2019-12-07 20:47:04,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-12-07 20:47:04,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions. [2019-12-07 20:47:04,121 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 13 [2019-12-07 20:47:04,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-12-07 20:47:04,122 INFO L462 AbstractCegarLoop]: Abstraction has 17 states and 20 transitions. [2019-12-07 20:47:04,122 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-12-07 20:47:04,122 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions. [2019-12-07 20:47:04,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-12-07 20:47:04,122 INFO L402 BasicCegarLoop]: Found error trace [2019-12-07 20:47:04,122 INFO L410 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-12-07 20:47:04,122 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-12-07 20:47:04,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-12-07 20:47:04,122 INFO L82 PathProgramCache]: Analyzing trace with hash 1243482538, now seen corresponding path program 1 times [2019-12-07 20:47:04,123 INFO L163 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-12-07 20:47:04,123 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1274746397] [2019-12-07 20:47:04,123 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-12-07 20:47:04,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 20:47:04,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-12-07 20:47:04,168 INFO L174 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2019-12-07 20:47:04,168 INFO L475 BasicCegarLoop]: Counterexample might be feasible [2019-12-07 20:47:04,187 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.12 08:47:04 BoogieIcfgContainer [2019-12-07 20:47:04,187 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-12-07 20:47:04,187 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2019-12-07 20:47:04,187 INFO L271 PluginConnector]: Initializing Witness Printer... [2019-12-07 20:47:04,187 INFO L275 PluginConnector]: Witness Printer initialized [2019-12-07 20:47:04,187 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 08:47:03" (3/4) ... [2019-12-07 20:47:04,189 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2019-12-07 20:47:04,220 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_b769d7b3-0396-45b8-ab00-caa730c982f3/bin/utaipan/witness.graphml [2019-12-07 20:47:04,221 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2019-12-07 20:47:04,222 INFO L168 Benchmark]: Toolchain (without parser) took 1252.23 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 102.2 MB). Free memory was 940.7 MB in the beginning and 969.8 MB in the end (delta: -29.1 MB). Peak memory consumption was 73.2 MB. Max. memory is 11.5 GB. [2019-12-07 20:47:04,222 INFO L168 Benchmark]: CDTParser took 0.12 ms. Allocated memory is still 1.0 GB. Free memory is still 960.9 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-12-07 20:47:04,223 INFO L168 Benchmark]: CACSL2BoogieTranslator took 305.85 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 102.2 MB). Free memory was 940.7 MB in the beginning and 1.1 GB in the end (delta: -140.1 MB). Peak memory consumption was 18.1 MB. Max. memory is 11.5 GB. [2019-12-07 20:47:04,223 INFO L168 Benchmark]: Boogie Procedure Inliner took 31.58 ms. Allocated memory is still 1.1 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. [2019-12-07 20:47:04,224 INFO L168 Benchmark]: Boogie Preprocessor took 19.11 ms. Allocated memory is still 1.1 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. [2019-12-07 20:47:04,224 INFO L168 Benchmark]: RCFGBuilder took 260.73 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 1.0 GB in the end (delta: 29.1 MB). Peak memory consumption was 29.1 MB. Max. memory is 11.5 GB. [2019-12-07 20:47:04,224 INFO L168 Benchmark]: TraceAbstraction took 598.26 ms. Allocated memory is still 1.1 GB. Free memory was 1.0 GB in the beginning and 975.2 MB in the end (delta: 71.2 MB). Peak memory consumption was 71.2 MB. Max. memory is 11.5 GB. [2019-12-07 20:47:04,225 INFO L168 Benchmark]: Witness Printer took 33.82 ms. Allocated memory is still 1.1 GB. Free memory was 975.2 MB in the beginning and 969.8 MB in the end (delta: 5.4 MB). Peak memory consumption was 5.4 MB. Max. memory is 11.5 GB. [2019-12-07 20:47:04,227 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.12 ms. Allocated memory is still 1.0 GB. Free memory is still 960.9 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 305.85 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 102.2 MB). Free memory was 940.7 MB in the beginning and 1.1 GB in the end (delta: -140.1 MB). Peak memory consumption was 18.1 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 31.58 ms. Allocated memory is still 1.1 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. * Boogie Preprocessor took 19.11 ms. Allocated memory is still 1.1 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 260.73 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 1.0 GB in the end (delta: 29.1 MB). Peak memory consumption was 29.1 MB. Max. memory is 11.5 GB. * TraceAbstraction took 598.26 ms. Allocated memory is still 1.1 GB. Free memory was 1.0 GB in the beginning and 975.2 MB in the end (delta: 71.2 MB). Peak memory consumption was 71.2 MB. Max. memory is 11.5 GB. * Witness Printer took 33.82 ms. Allocated memory is still 1.1 GB. Free memory was 975.2 MB in the beginning and 969.8 MB in the end (delta: 5.4 MB). Peak memory consumption was 5.4 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 546]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L521] int flag = __VERIFIER_nondet_int(); [L522] List p, a, t; [L523] a = (List) malloc(sizeof(struct node)) [L524] COND FALSE !(a == 0) [L525] p = a [L526] COND TRUE __VERIFIER_nondet_int() [L527] COND FALSE !(\read(flag)) [L530] p->h = 2 [L532] t = (List) malloc(sizeof(struct node)) [L533] COND FALSE !(t == 0) [L534] p->n = t [L535] EXPR p->n [L535] p = p->n [L526] COND FALSE !(__VERIFIER_nondet_int()) [L537] p->h = 3 [L538] p = a [L539] COND FALSE !(\read(flag)) [L543] EXPR p->h [L543] COND FALSE !(p->h == 1) [L545] EXPR p->h [L545] COND TRUE p->h != 3 [L546] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 19 locations, 1 error locations. Result: UNSAFE, OverallTime: 0.5s, OverallIterations: 5, TraceHistogramMax: 2, AutomataDifference: 0.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, HoareTripleCheckerStatistics: 60 SDtfs, 51 SDslu, 78 SDs, 0 SdLazy, 115 SolverSat, 6 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 23 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=23occurred in iteration=2, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 4 MinimizatonAttempts, 27 StatesRemovedByMinimization, 3 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.1s InterpolantComputationTime, 60 NumberOfCodeBlocks, 60 NumberOfCodeBlocksAsserted, 5 NumberOfCheckSat, 42 ConstructedInterpolants, 0 QuantifiedInterpolants, 1660 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 4 InterpolantComputations, 4 PerfectInterpolantSequences, 4/4 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...