./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/float-benchs/feedback_diverge.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 2329fc70 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/config/TaipanReach.xml -i ../../sv-benchmarks/c/float-benchs/feedback_diverge.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh --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 a6e296367f1fe3cf145b6868ec70c2d770b2281a31a9d7dcae84843c6ed48125 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-2329fc7 [2022-12-14 15:04:11,988 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 15:04:11,989 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 15:04:12,007 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 15:04:12,008 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 15:04:12,009 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 15:04:12,010 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 15:04:12,012 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 15:04:12,013 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 15:04:12,014 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 15:04:12,015 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 15:04:12,016 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 15:04:12,016 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 15:04:12,017 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 15:04:12,018 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 15:04:12,020 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 15:04:12,020 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 15:04:12,021 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 15:04:12,023 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 15:04:12,024 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 15:04:12,026 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 15:04:12,027 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 15:04:12,028 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 15:04:12,029 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 15:04:12,032 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 15:04:12,033 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 15:04:12,033 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 15:04:12,034 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 15:04:12,034 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 15:04:12,035 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 15:04:12,036 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 15:04:12,036 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 15:04:12,037 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 15:04:12,037 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 15:04:12,038 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 15:04:12,038 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 15:04:12,039 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 15:04:12,039 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 15:04:12,039 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 15:04:12,040 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 15:04:12,040 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 15:04:12,041 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-12-14 15:04:12,060 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 15:04:12,061 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 15:04:12,061 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 15:04:12,061 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 15:04:12,062 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 15:04:12,062 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 15:04:12,062 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 15:04:12,062 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 15:04:12,062 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 15:04:12,062 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 15:04:12,063 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 15:04:12,063 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 15:04:12,063 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 15:04:12,063 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 15:04:12,063 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 15:04:12,063 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 15:04:12,063 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 15:04:12,064 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 15:04:12,064 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 15:04:12,064 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 15:04:12,064 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 15:04:12,065 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 15:04:12,065 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 15:04:12,065 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-12-14 15:04:12,065 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 15:04:12,065 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-12-14 15:04:12,065 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 15:04:12,065 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-12-14 15:04:12,065 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 15:04:12,066 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-12-14 15:04:12,066 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 15:04:12,066 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 15:04:12,066 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 15:04:12,066 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 15:04:12,067 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 15:04:12,067 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 15:04:12,067 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-12-14 15:04:12,067 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 15:04:12,067 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 15:04:12,067 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-12-14 15:04:12,068 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 15:04:12,068 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a6e296367f1fe3cf145b6868ec70c2d770b2281a31a9d7dcae84843c6ed48125 [2022-12-14 15:04:12,250 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 15:04:12,266 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 15:04:12,268 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 15:04:12,269 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 15:04:12,270 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 15:04:12,271 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/float-benchs/feedback_diverge.c [2022-12-14 15:04:14,875 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 15:04:14,889 ERROR L? ?]: Error during toolchain job processing: java.lang.NullPointerException at org.eclipse.cdt.internal.core.model.PathEntry.kindFromString(PathEntry.java:80) at org.eclipse.cdt.internal.core.model.DefaultPathEntryStore.decodePathEntry(DefaultPathEntryStore.java:127) at org.eclipse.cdt.internal.core.model.DefaultPathEntryStore.getRawPathEntries(DefaultPathEntryStore.java:97) at org.eclipse.cdt.internal.core.model.PathEntryStoreProxy.getRawPathEntries(PathEntryStoreProxy.java:102) at org.eclipse.cdt.internal.core.model.PathEntryManager.getRawPathEntries(PathEntryManager.java:666) at org.eclipse.cdt.core.model.CoreModel.getRawPathEntries(CoreModel.java:937) at org.eclipse.cdt.core.model.CoreModel.oldIsScannerInformationEmpty(CoreModel.java:1307) at org.eclipse.cdt.core.model.CoreModel.isScannerInformationEmpty(CoreModel.java:1252) at org.eclipse.cdt.internal.core.pdom.indexer.ProjectIndexerInputAdapter.isFileBuildConfigured(ProjectIndexerInputAdapter.java:267) at org.eclipse.cdt.internal.core.pdom.AbstractIndexerTask.isRequiredInIndex(AbstractIndexerTask.java:748) at org.eclipse.cdt.internal.core.pdom.AbstractIndexerTask.extractFiles(AbstractIndexerTask.java:667) at org.eclipse.cdt.internal.core.pdom.AbstractIndexerTask.runTask(AbstractIndexerTask.java:558) at org.eclipse.cdt.internal.core.pdom.indexer.PDOMIndexerTask.run(PDOMIndexerTask.java:164) at org.eclipse.cdt.internal.core.pdom.PDOMIndexerJob.run(PDOMIndexerJob.java:160) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-12-14 15:04:15,010 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 15:04:15,011 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/sv-benchmarks/c/float-benchs/feedback_diverge.c [2022-12-14 15:04:15,016 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/data/8ca6a2825/11cae82a8bb940d2ab5da328f38a044f/FLAG944ae1a53 [2022-12-14 15:04:15,028 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/data/8ca6a2825/11cae82a8bb940d2ab5da328f38a044f [2022-12-14 15:04:15,031 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 15:04:15,032 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 15:04:15,033 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 15:04:15,033 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 15:04:15,036 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 15:04:15,037 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 03:04:15" (1/1) ... [2022-12-14 15:04:15,037 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@378036a0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:04:15, skipping insertion in model container [2022-12-14 15:04:15,037 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 03:04:15" (1/1) ... [2022-12-14 15:04:15,043 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 15:04:15,055 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 15:04:15,171 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/sv-benchmarks/c/float-benchs/feedback_diverge.c[626,639] [2022-12-14 15:04:15,182 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 15:04:15,190 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 15:04:15,199 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/sv-benchmarks/c/float-benchs/feedback_diverge.c[626,639] [2022-12-14 15:04:15,203 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 15:04:15,213 INFO L208 MainTranslator]: Completed translation [2022-12-14 15:04:15,213 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:04:15 WrapperNode [2022-12-14 15:04:15,213 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 15:04:15,214 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 15:04:15,214 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 15:04:15,214 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 15:04:15,219 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:04:15" (1/1) ... [2022-12-14 15:04:15,225 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:04:15" (1/1) ... [2022-12-14 15:04:15,237 INFO L138 Inliner]: procedures = 16, calls = 10, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 47 [2022-12-14 15:04:15,238 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 15:04:15,238 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 15:04:15,238 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 15:04:15,238 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 15:04:15,244 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:04:15" (1/1) ... [2022-12-14 15:04:15,245 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:04:15" (1/1) ... [2022-12-14 15:04:15,245 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:04:15" (1/1) ... [2022-12-14 15:04:15,246 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:04:15" (1/1) ... [2022-12-14 15:04:15,248 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:04:15" (1/1) ... [2022-12-14 15:04:15,250 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:04:15" (1/1) ... [2022-12-14 15:04:15,251 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:04:15" (1/1) ... [2022-12-14 15:04:15,251 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:04:15" (1/1) ... [2022-12-14 15:04:15,252 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 15:04:15,253 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 15:04:15,253 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 15:04:15,253 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 15:04:15,253 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:04:15" (1/1) ... [2022-12-14 15:04:15,258 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 15:04:15,266 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:04:15,275 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 15:04:15,277 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 15:04:15,311 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 15:04:15,311 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 15:04:15,311 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 15:04:15,311 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 15:04:15,376 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 15:04:15,378 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 15:04:15,470 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 15:04:15,515 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 15:04:15,515 INFO L300 CfgBuilder]: Removed 1 assume(true) statements. [2022-12-14 15:04:15,517 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 03:04:15 BoogieIcfgContainer [2022-12-14 15:04:15,517 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 15:04:15,520 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 15:04:15,520 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 15:04:15,524 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 15:04:15,524 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 03:04:15" (1/3) ... [2022-12-14 15:04:15,525 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2613cbe1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 03:04:15, skipping insertion in model container [2022-12-14 15:04:15,525 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:04:15" (2/3) ... [2022-12-14 15:04:15,525 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2613cbe1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 03:04:15, skipping insertion in model container [2022-12-14 15:04:15,525 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 03:04:15" (3/3) ... [2022-12-14 15:04:15,526 INFO L112 eAbstractionObserver]: Analyzing ICFG feedback_diverge.c [2022-12-14 15:04:15,545 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 15:04:15,546 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-12-14 15:04:15,593 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 15:04:15,600 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@5729f6a8, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 15:04:15,601 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-12-14 15:04:15,605 INFO L276 IsEmpty]: Start isEmpty. Operand has 7 states, 5 states have (on average 1.6) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:15,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-12-14 15:04:15,611 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:04:15,612 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2022-12-14 15:04:15,613 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:04:15,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:04:15,618 INFO L85 PathProgramCache]: Analyzing trace with hash 2465126, now seen corresponding path program 1 times [2022-12-14 15:04:15,628 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:04:15,629 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [403953305] [2022-12-14 15:04:15,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:04:15,630 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:04:15,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:04:15,795 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:04:15,796 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:04:15,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [403953305] [2022-12-14 15:04:15,797 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [403953305] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 15:04:15,797 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 15:04:15,797 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-12-14 15:04:15,798 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1976329646] [2022-12-14 15:04:15,799 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 15:04:15,803 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 15:04:15,804 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:04:15,832 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 15:04:15,833 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 15:04:15,835 INFO L87 Difference]: Start difference. First operand has 7 states, 5 states have (on average 1.6) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:15,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:04:15,861 INFO L93 Difference]: Finished difference Result 13 states and 15 transitions. [2022-12-14 15:04:15,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 15:04:15,864 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2022-12-14 15:04:15,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:04:15,871 INFO L225 Difference]: With dead ends: 13 [2022-12-14 15:04:15,871 INFO L226 Difference]: Without dead ends: 6 [2022-12-14 15:04:15,879 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 15:04:15,882 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:04:15,882 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 6 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 15:04:15,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6 states. [2022-12-14 15:04:15,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6 to 6. [2022-12-14 15:04:15,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6 states, 5 states have (on average 1.2) internal successors, (6), 5 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:15,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 6 transitions. [2022-12-14 15:04:15,909 INFO L78 Accepts]: Start accepts. Automaton has 6 states and 6 transitions. Word has length 4 [2022-12-14 15:04:15,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:04:15,909 INFO L495 AbstractCegarLoop]: Abstraction has 6 states and 6 transitions. [2022-12-14 15:04:15,909 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:15,910 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states and 6 transitions. [2022-12-14 15:04:15,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-12-14 15:04:15,910 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:04:15,910 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2022-12-14 15:04:15,910 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-12-14 15:04:15,910 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:04:15,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:04:15,911 INFO L85 PathProgramCache]: Analyzing trace with hash 76614925, now seen corresponding path program 1 times [2022-12-14 15:04:15,911 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:04:15,911 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [357992577] [2022-12-14 15:04:15,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:04:15,911 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:04:15,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:04:15,963 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:04:15,963 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:04:15,964 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [357992577] [2022-12-14 15:04:15,964 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [357992577] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:04:15,964 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1301521772] [2022-12-14 15:04:15,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:04:15,964 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:04:15,964 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:04:15,965 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:04:15,966 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 15:04:16,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:04:16,017 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 3 conjunts are in the unsatisfiable core [2022-12-14 15:04:16,021 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:04:16,052 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:04:16,053 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:04:16,070 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:04:16,071 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1301521772] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:04:16,071 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2031311280] [2022-12-14 15:04:16,088 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2022-12-14 15:04:16,088 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:04:16,091 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:04:16,097 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:04:16,097 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:04:16,244 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:04:16,319 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '69#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 3600000 |ULTIMATE.start_main_~i~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:04:16,319 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:04:16,319 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:04:16,319 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2022-12-14 15:04:16,320 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [803291209] [2022-12-14 15:04:16,320 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:04:16,321 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-12-14 15:04:16,321 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:04:16,322 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-12-14 15:04:16,322 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2022-12-14 15:04:16,322 INFO L87 Difference]: Start difference. First operand 6 states and 6 transitions. Second operand has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:16,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:04:16,337 INFO L93 Difference]: Finished difference Result 12 states and 14 transitions. [2022-12-14 15:04:16,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 15:04:16,338 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2022-12-14 15:04:16,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:04:16,338 INFO L225 Difference]: With dead ends: 12 [2022-12-14 15:04:16,338 INFO L226 Difference]: Without dead ends: 9 [2022-12-14 15:04:16,339 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2022-12-14 15:04:16,340 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:04:16,340 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 8 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 15:04:16,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2022-12-14 15:04:16,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2022-12-14 15:04:16,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.125) internal successors, (9), 8 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:16,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2022-12-14 15:04:16,342 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 5 [2022-12-14 15:04:16,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:04:16,342 INFO L495 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2022-12-14 15:04:16,342 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:16,342 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2022-12-14 15:04:16,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-12-14 15:04:16,343 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:04:16,343 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1] [2022-12-14 15:04:16,348 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 15:04:16,543 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:04:16,544 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:04:16,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:04:16,544 INFO L85 PathProgramCache]: Analyzing trace with hash 2002243366, now seen corresponding path program 2 times [2022-12-14 15:04:16,544 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:04:16,544 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [831189617] [2022-12-14 15:04:16,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:04:16,545 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:04:16,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:04:16,691 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:04:16,691 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:04:16,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [831189617] [2022-12-14 15:04:16,692 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [831189617] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:04:16,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [724338079] [2022-12-14 15:04:16,692 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:04:16,692 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:04:16,693 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:04:16,693 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:04:16,694 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 15:04:16,738 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 15:04:16,739 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:04:16,739 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 6 conjunts are in the unsatisfiable core [2022-12-14 15:04:16,740 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:04:16,755 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:04:16,756 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:04:16,798 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:04:16,798 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [724338079] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:04:16,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [983732511] [2022-12-14 15:04:16,800 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2022-12-14 15:04:16,800 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:04:16,800 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:04:16,801 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:04:16,801 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:04:16,877 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:04:16,942 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '158#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 3600000 |ULTIMATE.start_main_~i~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:04:16,942 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:04:16,942 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:04:16,942 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2022-12-14 15:04:16,943 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [913002114] [2022-12-14 15:04:16,943 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:04:16,943 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-12-14 15:04:16,943 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:04:16,944 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-12-14 15:04:16,944 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=153, Unknown=0, NotChecked=0, Total=240 [2022-12-14 15:04:16,944 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand has 13 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:16,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:04:16,960 INFO L93 Difference]: Finished difference Result 18 states and 23 transitions. [2022-12-14 15:04:16,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-12-14 15:04:16,960 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-12-14 15:04:16,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:04:16,961 INFO L225 Difference]: With dead ends: 18 [2022-12-14 15:04:16,961 INFO L226 Difference]: Without dead ends: 15 [2022-12-14 15:04:16,961 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=87, Invalid=153, Unknown=0, NotChecked=0, Total=240 [2022-12-14 15:04:16,962 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:04:16,962 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 8 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 15:04:16,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-12-14 15:04:16,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-12-14 15:04:16,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 14 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:16,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2022-12-14 15:04:16,965 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 8 [2022-12-14 15:04:16,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:04:16,965 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2022-12-14 15:04:16,965 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:16,965 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2022-12-14 15:04:16,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-12-14 15:04:16,966 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:04:16,966 INFO L195 NwaCegarLoop]: trace histogram [10, 1, 1, 1, 1] [2022-12-14 15:04:16,971 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-12-14 15:04:17,167 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:04:17,168 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:04:17,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:04:17,170 INFO L85 PathProgramCache]: Analyzing trace with hash -2001324602, now seen corresponding path program 3 times [2022-12-14 15:04:17,170 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:04:17,171 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1321069082] [2022-12-14 15:04:17,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:04:17,172 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:04:17,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:04:17,482 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:04:17,482 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:04:17,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1321069082] [2022-12-14 15:04:17,482 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1321069082] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:04:17,483 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1209881997] [2022-12-14 15:04:17,483 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:04:17,483 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:04:17,483 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:04:17,484 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:04:17,485 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-14 15:04:17,539 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:04:17,540 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:04:17,541 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 12 conjunts are in the unsatisfiable core [2022-12-14 15:04:17,542 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:04:17,571 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:04:17,571 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:04:17,730 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:04:17,730 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1209881997] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:04:17,730 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2074992476] [2022-12-14 15:04:17,732 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2022-12-14 15:04:17,732 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:04:17,732 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:04:17,733 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:04:17,733 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:04:17,791 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:04:17,866 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '319#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 3600000 |ULTIMATE.start_main_~i~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:04:17,866 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:04:17,866 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:04:17,866 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2022-12-14 15:04:17,866 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [46983957] [2022-12-14 15:04:17,867 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:04:17,867 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-12-14 15:04:17,867 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:04:17,868 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-12-14 15:04:17,869 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=309, Invalid=447, Unknown=0, NotChecked=0, Total=756 [2022-12-14 15:04:17,869 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand has 25 states, 25 states have (on average 1.12) internal successors, (28), 24 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:17,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:04:17,898 INFO L93 Difference]: Finished difference Result 30 states and 41 transitions. [2022-12-14 15:04:17,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-12-14 15:04:17,899 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.12) internal successors, (28), 24 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-12-14 15:04:17,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:04:17,899 INFO L225 Difference]: With dead ends: 30 [2022-12-14 15:04:17,899 INFO L226 Difference]: Without dead ends: 27 [2022-12-14 15:04:17,900 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 139 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=309, Invalid=447, Unknown=0, NotChecked=0, Total=756 [2022-12-14 15:04:17,900 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:04:17,901 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 4 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 15:04:17,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-12-14 15:04:17,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2022-12-14 15:04:17,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.0384615384615385) internal successors, (27), 26 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:17,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2022-12-14 15:04:17,904 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 14 [2022-12-14 15:04:17,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:04:17,905 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2022-12-14 15:04:17,905 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.12) internal successors, (28), 24 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:17,905 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2022-12-14 15:04:17,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-12-14 15:04:17,905 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:04:17,905 INFO L195 NwaCegarLoop]: trace histogram [22, 1, 1, 1, 1] [2022-12-14 15:04:17,910 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-12-14 15:04:18,106 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:04:18,107 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:04:18,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:04:18,109 INFO L85 PathProgramCache]: Analyzing trace with hash -1578198266, now seen corresponding path program 4 times [2022-12-14 15:04:18,110 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:04:18,110 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2041018668] [2022-12-14 15:04:18,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:04:18,112 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:04:18,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:04:18,768 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:04:18,769 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:04:18,769 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2041018668] [2022-12-14 15:04:18,769 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2041018668] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:04:18,769 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [247105096] [2022-12-14 15:04:18,769 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:04:18,769 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:04:18,769 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:04:18,770 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:04:18,771 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-12-14 15:04:18,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:04:18,845 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 24 conjunts are in the unsatisfiable core [2022-12-14 15:04:18,846 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:04:18,897 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:04:18,897 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:04:19,428 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:04:19,428 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [247105096] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:04:19,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1663467348] [2022-12-14 15:04:19,430 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2022-12-14 15:04:19,431 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:04:19,431 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:04:19,431 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:04:19,431 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:04:19,479 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:04:19,561 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '624#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 3600000 |ULTIMATE.start_main_~i~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:04:19,562 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:04:19,562 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:04:19,562 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 48 [2022-12-14 15:04:19,562 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [347370200] [2022-12-14 15:04:19,562 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:04:19,563 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-12-14 15:04:19,563 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:04:19,564 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-12-14 15:04:19,565 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1185, Invalid=1467, Unknown=0, NotChecked=0, Total=2652 [2022-12-14 15:04:19,565 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand has 49 states, 49 states have (on average 1.0612244897959184) internal successors, (52), 48 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:19,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:04:19,616 INFO L93 Difference]: Finished difference Result 54 states and 77 transitions. [2022-12-14 15:04:19,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-12-14 15:04:19,616 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.0612244897959184) internal successors, (52), 48 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2022-12-14 15:04:19,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:04:19,617 INFO L225 Difference]: With dead ends: 54 [2022-12-14 15:04:19,617 INFO L226 Difference]: Without dead ends: 51 [2022-12-14 15:04:19,619 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 295 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1185, Invalid=1467, Unknown=0, NotChecked=0, Total=2652 [2022-12-14 15:04:19,620 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:04:19,620 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 15:04:19,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2022-12-14 15:04:19,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2022-12-14 15:04:19,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.02) internal successors, (51), 50 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:19,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2022-12-14 15:04:19,627 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 26 [2022-12-14 15:04:19,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:04:19,627 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2022-12-14 15:04:19,628 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.0612244897959184) internal successors, (52), 48 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:19,628 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2022-12-14 15:04:19,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-12-14 15:04:19,629 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:04:19,629 INFO L195 NwaCegarLoop]: trace histogram [46, 1, 1, 1, 1] [2022-12-14 15:04:19,635 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-12-14 15:04:19,829 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:04:19,831 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:04:19,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:04:19,832 INFO L85 PathProgramCache]: Analyzing trace with hash 86361478, now seen corresponding path program 5 times [2022-12-14 15:04:19,832 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:04:19,832 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [789770109] [2022-12-14 15:04:19,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:04:19,833 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:04:19,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:04:21,073 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:04:21,073 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:04:21,073 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [789770109] [2022-12-14 15:04:21,073 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [789770109] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:04:21,073 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1713401807] [2022-12-14 15:04:21,074 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:04:21,074 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:04:21,074 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:04:21,074 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:04:21,075 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-12-14 15:04:21,236 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2022-12-14 15:04:21,236 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:04:21,239 INFO L263 TraceCheckSpWp]: Trace formula consists of 407 conjuncts, 48 conjunts are in the unsatisfiable core [2022-12-14 15:04:21,241 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:04:21,316 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:04:21,317 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:04:23,188 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:04:23,188 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1713401807] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:04:23,188 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [594129286] [2022-12-14 15:04:23,190 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2022-12-14 15:04:23,190 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:04:23,190 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:04:23,191 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:04:23,191 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:04:23,235 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:04:23,344 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1217#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 3600000 |ULTIMATE.start_main_~i~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:04:23,344 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:04:23,344 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:04:23,344 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 96 [2022-12-14 15:04:23,345 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [776233715] [2022-12-14 15:04:23,345 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:04:23,345 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2022-12-14 15:04:23,346 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:04:23,349 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2022-12-14 15:04:23,352 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4665, Invalid=5235, Unknown=0, NotChecked=0, Total=9900 [2022-12-14 15:04:23,352 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand has 97 states, 97 states have (on average 1.0309278350515463) internal successors, (100), 96 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:23,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:04:23,456 INFO L93 Difference]: Finished difference Result 102 states and 149 transitions. [2022-12-14 15:04:23,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2022-12-14 15:04:23,456 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 1.0309278350515463) internal successors, (100), 96 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2022-12-14 15:04:23,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:04:23,458 INFO L225 Difference]: With dead ends: 102 [2022-12-14 15:04:23,458 INFO L226 Difference]: Without dead ends: 99 [2022-12-14 15:04:23,460 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 607 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=4665, Invalid=5235, Unknown=0, NotChecked=0, Total=9900 [2022-12-14 15:04:23,461 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:04:23,461 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 8 Invalid, 101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:04:23,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-12-14 15:04:23,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2022-12-14 15:04:23,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 98 states have (on average 1.010204081632653) internal successors, (99), 98 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:23,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 99 transitions. [2022-12-14 15:04:23,467 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 99 transitions. Word has length 50 [2022-12-14 15:04:23,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:04:23,467 INFO L495 AbstractCegarLoop]: Abstraction has 99 states and 99 transitions. [2022-12-14 15:04:23,468 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 97 states have (on average 1.0309278350515463) internal successors, (100), 96 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:23,468 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 99 transitions. [2022-12-14 15:04:23,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2022-12-14 15:04:23,469 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:04:23,469 INFO L195 NwaCegarLoop]: trace histogram [94, 1, 1, 1, 1] [2022-12-14 15:04:23,475 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-12-14 15:04:23,669 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-12-14 15:04:23,670 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:04:23,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:04:23,672 INFO L85 PathProgramCache]: Analyzing trace with hash -915563898, now seen corresponding path program 6 times [2022-12-14 15:04:23,672 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:04:23,672 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [55216103] [2022-12-14 15:04:23,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:04:23,673 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:04:23,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:04:28,358 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:04:28,358 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:04:28,359 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [55216103] [2022-12-14 15:04:28,359 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [55216103] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:04:28,359 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2099361892] [2022-12-14 15:04:28,359 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:04:28,359 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:04:28,359 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:04:28,360 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:04:28,360 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-12-14 15:04:28,535 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:04:28,535 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:04:28,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 791 conjuncts, 96 conjunts are in the unsatisfiable core [2022-12-14 15:04:28,548 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:04:28,676 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:04:28,676 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:04:36,026 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:04:36,026 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2099361892] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:04:36,026 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1604422524] [2022-12-14 15:04:36,027 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2022-12-14 15:04:36,027 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:04:36,028 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:04:36,028 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:04:36,028 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:04:36,070 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:04:36,256 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2386#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 3600000 |ULTIMATE.start_main_~i~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:04:36,256 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:04:36,257 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:04:36,257 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [96, 96, 96] total 192 [2022-12-14 15:04:36,257 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [356445311] [2022-12-14 15:04:36,257 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:04:36,258 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 193 states [2022-12-14 15:04:36,258 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:04:36,267 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 193 interpolants. [2022-12-14 15:04:36,282 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18537, Invalid=19683, Unknown=0, NotChecked=0, Total=38220 [2022-12-14 15:04:36,283 INFO L87 Difference]: Start difference. First operand 99 states and 99 transitions. Second operand has 193 states, 193 states have (on average 1.0155440414507773) internal successors, (196), 192 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:36,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:04:36,545 INFO L93 Difference]: Finished difference Result 198 states and 293 transitions. [2022-12-14 15:04:36,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 192 states. [2022-12-14 15:04:36,546 INFO L78 Accepts]: Start accepts. Automaton has has 193 states, 193 states have (on average 1.0155440414507773) internal successors, (196), 192 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 98 [2022-12-14 15:04:36,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:04:36,547 INFO L225 Difference]: With dead ends: 198 [2022-12-14 15:04:36,547 INFO L226 Difference]: Without dead ends: 195 [2022-12-14 15:04:36,551 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 388 GetRequests, 194 SyntacticMatches, 0 SemanticMatches, 194 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1231 ImplicationChecksByTransitivity, 9.8s TimeCoverageRelationStatistics Valid=18537, Invalid=19683, Unknown=0, NotChecked=0, Total=38220 [2022-12-14 15:04:36,552 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 201 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:04:36,552 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 14 Invalid, 201 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 200 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:04:36,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2022-12-14 15:04:36,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 195. [2022-12-14 15:04:36,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 195 states, 194 states have (on average 1.0051546391752577) internal successors, (195), 194 states have internal predecessors, (195), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:36,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 195 transitions. [2022-12-14 15:04:36,568 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 195 transitions. Word has length 98 [2022-12-14 15:04:36,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:04:36,569 INFO L495 AbstractCegarLoop]: Abstraction has 195 states and 195 transitions. [2022-12-14 15:04:36,569 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 193 states, 193 states have (on average 1.0155440414507773) internal successors, (196), 192 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:36,569 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 195 transitions. [2022-12-14 15:04:36,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2022-12-14 15:04:36,572 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:04:36,572 INFO L195 NwaCegarLoop]: trace histogram [190, 1, 1, 1, 1] [2022-12-14 15:04:36,578 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-12-14 15:04:36,773 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:04:36,774 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:04:36,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:04:36,775 INFO L85 PathProgramCache]: Analyzing trace with hash 1600341126, now seen corresponding path program 7 times [2022-12-14 15:04:36,775 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:04:36,775 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1575395207] [2022-12-14 15:04:36,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:04:36,776 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:04:36,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:04:51,862 INFO L134 CoverageAnalysis]: Checked inductivity of 18145 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:04:51,862 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:04:51,862 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1575395207] [2022-12-14 15:04:51,862 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1575395207] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:04:51,862 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2091851462] [2022-12-14 15:04:51,862 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:04:51,863 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:04:51,863 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:04:51,863 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:04:51,864 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-12-14 15:04:52,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:04:52,228 INFO L263 TraceCheckSpWp]: Trace formula consists of 1559 conjuncts, 192 conjunts are in the unsatisfiable core [2022-12-14 15:04:52,234 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:04:52,450 INFO L134 CoverageAnalysis]: Checked inductivity of 18145 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:04:52,450 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:05:18,652 INFO L134 CoverageAnalysis]: Checked inductivity of 18145 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:05:18,653 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2091851462] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:05:18,653 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1948127190] [2022-12-14 15:05:18,654 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2022-12-14 15:05:18,654 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:05:18,654 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:05:18,654 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:05:18,654 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:05:18,715 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:05:19,035 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4707#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 3600000 |ULTIMATE.start_main_~i~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:05:19,035 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:05:19,035 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:05:19,036 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [192, 192, 192] total 384 [2022-12-14 15:05:19,036 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [437950586] [2022-12-14 15:05:19,036 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:05:19,037 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 385 states [2022-12-14 15:05:19,037 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:05:19,049 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 385 interpolants. [2022-12-14 15:05:19,055 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73929, Invalid=76227, Unknown=0, NotChecked=0, Total=150156 [2022-12-14 15:05:19,055 INFO L87 Difference]: Start difference. First operand 195 states and 195 transitions. Second operand has 385 states, 385 states have (on average 1.0077922077922077) internal successors, (388), 384 states have internal predecessors, (388), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:05:20,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:05:20,493 INFO L93 Difference]: Finished difference Result 390 states and 581 transitions. [2022-12-14 15:05:20,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 384 states. [2022-12-14 15:05:20,493 INFO L78 Accepts]: Start accepts. Automaton has has 385 states, 385 states have (on average 1.0077922077922077) internal successors, (388), 384 states have internal predecessors, (388), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 194 [2022-12-14 15:05:20,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:05:20,495 INFO L225 Difference]: With dead ends: 390 [2022-12-14 15:05:20,495 INFO L226 Difference]: Without dead ends: 387 [2022-12-14 15:05:20,500 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 772 GetRequests, 386 SyntacticMatches, 0 SemanticMatches, 386 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2479 ImplicationChecksByTransitivity, 34.4s TimeCoverageRelationStatistics Valid=73929, Invalid=76227, Unknown=0, NotChecked=0, Total=150156 [2022-12-14 15:05:20,501 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 393 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 394 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 393 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 15:05:20,501 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 18 Invalid, 394 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 393 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 15:05:20,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 387 states. [2022-12-14 15:05:20,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 387 to 387. [2022-12-14 15:05:20,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 387 states, 386 states have (on average 1.0025906735751295) internal successors, (387), 386 states have internal predecessors, (387), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:05:20,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 387 states to 387 states and 387 transitions. [2022-12-14 15:05:20,515 INFO L78 Accepts]: Start accepts. Automaton has 387 states and 387 transitions. Word has length 194 [2022-12-14 15:05:20,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:05:20,516 INFO L495 AbstractCegarLoop]: Abstraction has 387 states and 387 transitions. [2022-12-14 15:05:20,516 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 385 states, 385 states have (on average 1.0077922077922077) internal successors, (388), 384 states have internal predecessors, (388), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:05:20,516 INFO L276 IsEmpty]: Start isEmpty. Operand 387 states and 387 transitions. [2022-12-14 15:05:20,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 387 [2022-12-14 15:05:20,520 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:05:20,521 INFO L195 NwaCegarLoop]: trace histogram [382, 1, 1, 1, 1] [2022-12-14 15:05:20,529 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-12-14 15:05:20,721 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:05:20,722 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:05:20,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:05:20,724 INFO L85 PathProgramCache]: Analyzing trace with hash 1894160518, now seen corresponding path program 8 times [2022-12-14 15:05:20,724 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:05:20,724 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1041773952] [2022-12-14 15:05:20,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:05:20,725 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:05:21,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:06:27,245 INFO L134 CoverageAnalysis]: Checked inductivity of 73153 backedges. 0 proven. 73153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:06:27,245 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:06:27,245 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1041773952] [2022-12-14 15:06:27,245 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1041773952] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:06:27,245 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1012408003] [2022-12-14 15:06:27,245 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:06:27,245 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:06:27,246 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:06:27,246 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:06:27,247 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-12-14 15:06:29,894 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 192 check-sat command(s) [2022-12-14 15:06:29,894 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:06:29,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 3095 conjuncts, 384 conjunts are in the unsatisfiable core [2022-12-14 15:06:29,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:06:30,269 INFO L134 CoverageAnalysis]: Checked inductivity of 73153 backedges. 0 proven. 73153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:06:30,269 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:08:12,834 INFO L134 CoverageAnalysis]: Checked inductivity of 73153 backedges. 0 proven. 73153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:08:12,834 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1012408003] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:08:12,834 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1447065892] [2022-12-14 15:08:12,836 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2022-12-14 15:08:12,836 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:08:12,836 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:08:12,837 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:08:12,837 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:08:12,875 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:08:13,414 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9332#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 3600000 |ULTIMATE.start_main_~i~0#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2022-12-14 15:08:13,414 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:08:13,414 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:08:13,415 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [384, 384, 384] total 768 [2022-12-14 15:08:13,415 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1504991596] [2022-12-14 15:08:13,415 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:08:13,417 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 769 states [2022-12-14 15:08:13,417 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:08:13,456 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 769 interpolants. [2022-12-14 15:08:13,480 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=295305, Invalid=299907, Unknown=0, NotChecked=0, Total=595212 [2022-12-14 15:08:13,481 INFO L87 Difference]: Start difference. First operand 387 states and 387 transitions. Second operand has 769 states, 769 states have (on average 1.0039011703511054) internal successors, (772), 768 states have internal predecessors, (772), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:08:26,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:08:26,635 INFO L93 Difference]: Finished difference Result 774 states and 1157 transitions. [2022-12-14 15:08:26,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 768 states. [2022-12-14 15:08:26,637 INFO L78 Accepts]: Start accepts. Automaton has has 769 states, 769 states have (on average 1.0039011703511054) internal successors, (772), 768 states have internal predecessors, (772), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 386 [2022-12-14 15:08:26,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:08:26,639 INFO L225 Difference]: With dead ends: 774 [2022-12-14 15:08:26,639 INFO L226 Difference]: Without dead ends: 771 [2022-12-14 15:08:26,665 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1540 GetRequests, 770 SyntacticMatches, 0 SemanticMatches, 770 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4975 ImplicationChecksByTransitivity, 136.3s TimeCoverageRelationStatistics Valid=295305, Invalid=299907, Unknown=0, NotChecked=0, Total=595212 [2022-12-14 15:08:26,665 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 779 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 780 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 779 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-12-14 15:08:26,665 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 22 Invalid, 780 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 779 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-12-14 15:08:26,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 771 states. [2022-12-14 15:08:26,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 771 to 771. [2022-12-14 15:08:26,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 771 states, 770 states have (on average 1.0012987012987014) internal successors, (771), 770 states have internal predecessors, (771), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:08:26,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 771 states to 771 states and 771 transitions. [2022-12-14 15:08:26,686 INFO L78 Accepts]: Start accepts. Automaton has 771 states and 771 transitions. Word has length 386 [2022-12-14 15:08:26,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:08:26,686 INFO L495 AbstractCegarLoop]: Abstraction has 771 states and 771 transitions. [2022-12-14 15:08:26,687 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 769 states, 769 states have (on average 1.0039011703511054) internal successors, (772), 768 states have internal predecessors, (772), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:08:26,687 INFO L276 IsEmpty]: Start isEmpty. Operand 771 states and 771 transitions. [2022-12-14 15:08:26,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 771 [2022-12-14 15:08:26,700 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:08:26,701 INFO L195 NwaCegarLoop]: trace histogram [766, 1, 1, 1, 1] [2022-12-14 15:08:26,711 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-12-14 15:08:26,901 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:08:26,902 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:08:26,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:08:26,903 INFO L85 PathProgramCache]: Analyzing trace with hash -1437777786, now seen corresponding path program 9 times [2022-12-14 15:08:26,904 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:08:26,904 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [219764527] [2022-12-14 15:08:26,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:08:26,905 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:08:29,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:14:03,412 INFO L134 CoverageAnalysis]: Checked inductivity of 293761 backedges. 0 proven. 293761 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:14:03,412 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:14:03,412 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [219764527] [2022-12-14 15:14:03,413 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [219764527] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:14:03,413 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1809182702] [2022-12-14 15:14:03,413 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:14:03,413 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:14:03,413 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:14:03,414 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:14:03,414 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_641cc76b-02af-4c15-88a6-868c0f02080c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-12-14 15:14:04,635 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:14:04,635 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:14:04,682 INFO L263 TraceCheckSpWp]: Trace formula consists of 6167 conjuncts, 768 conjunts are in the unsatisfiable core [2022-12-14 15:14:04,717 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:14:05,395 INFO L134 CoverageAnalysis]: Checked inductivity of 293761 backedges. 0 proven. 293761 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 15:14:05,395 INFO L328 TraceCheckSpWp]: Computing backward predicates...