./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label49+token_ring.12.cil-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 63182f13 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label49+token_ring.12.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF --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 ad834a4fb5f4154353fe834bdf1b25d8394c06509e997c3a1b1b485e0c0b77f0 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-63182f1 [2021-11-12 23:21:56,759 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-12 23:21:56,763 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-12 23:21:56,840 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-12 23:21:56,842 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-12 23:21:56,848 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-12 23:21:56,851 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-12 23:21:56,856 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-12 23:21:56,860 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-12 23:21:56,866 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-12 23:21:56,868 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-12 23:21:56,870 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-12 23:21:56,871 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-12 23:21:56,874 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-12 23:21:56,876 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-12 23:21:56,880 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-12 23:21:56,882 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-12 23:21:56,883 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-12 23:21:56,890 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-12 23:21:56,902 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-12 23:21:56,905 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-12 23:21:56,907 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-12 23:21:56,911 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-12 23:21:56,912 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-12 23:21:56,923 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-12 23:21:56,924 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-12 23:21:56,924 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-12 23:21:56,927 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-12 23:21:56,928 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-12 23:21:56,929 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-12 23:21:56,930 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-12 23:21:56,931 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-12 23:21:56,933 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-12 23:21:56,935 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-12 23:21:56,937 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-12 23:21:56,937 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-12 23:21:56,938 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-12 23:21:56,938 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-12 23:21:56,938 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-12 23:21:56,939 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-12 23:21:56,940 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-12 23:21:56,941 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-12 23:21:56,996 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-12 23:21:56,997 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-12 23:21:56,998 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-12 23:21:56,998 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-12 23:21:56,999 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-12 23:21:56,999 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-12 23:21:56,999 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-12 23:21:57,000 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-12 23:21:57,000 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-12 23:21:57,000 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-12 23:21:57,009 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-12 23:21:57,009 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-12 23:21:57,009 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-12 23:21:57,010 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-12 23:21:57,010 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-12 23:21:57,010 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-12 23:21:57,011 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-12 23:21:57,012 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-12 23:21:57,012 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-12 23:21:57,012 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-12 23:21:57,012 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-12 23:21:57,013 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-12 23:21:57,013 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-12 23:21:57,013 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-12 23:21:57,014 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-12 23:21:57,014 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-12 23:21:57,014 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-12 23:21:57,014 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-12 23:21:57,015 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-12 23:21:57,017 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-12 23:21:57,017 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-12 23:21:57,017 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 23:21:57,018 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-12 23:21:57,018 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-12 23:21:57,018 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-12 23:21:57,019 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-12 23:21:57,019 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-12 23:21:57,019 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-12 23:21:57,019 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-12 23:21:57,020 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-12 23:21:57,020 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ad834a4fb5f4154353fe834bdf1b25d8394c06509e997c3a1b1b485e0c0b77f0 [2021-11-12 23:21:57,422 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-12 23:21:57,453 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-12 23:21:57,458 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-12 23:21:57,459 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-12 23:21:57,460 INFO L275 PluginConnector]: CDTParser initialized [2021-11-12 23:21:57,462 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/../../sv-benchmarks/c/combinations/Problem05_label49+token_ring.12.cil-1.c [2021-11-12 23:21:57,535 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/data/e5a245e97/7486f1ee98bb4cfc9340afeb314f985a/FLAGde69684a4 [2021-11-12 23:21:57,956 ERROR L? ?]: Error during toolchain job processing: java.lang.NullPointerException at de.uni_freiburg.informatik.ultimate.cdt.parser.UltimateCdtExternalSettingsProvider.getSettings(UltimateCdtExternalSettingsProvider.java:67) at org.eclipse.cdt.core.settings.model.extension.CExternalSettingProvider.getSettings(CExternalSettingProvider.java:48) at org.eclipse.cdt.internal.core.settings.model.ExtensionContainerFactory$CExtensionSettingProviderDescriptor.getContainer(ExtensionContainerFactory.java:110) at org.eclipse.cdt.internal.core.settings.model.ExtensionContainerFactory.createContainer(ExtensionContainerFactory.java:186) at org.eclipse.cdt.internal.core.settings.model.CExternalSettingsManager$ContainerDescriptor.(CExternalSettingsManager.java:147) at org.eclipse.cdt.internal.core.settings.model.CExternalSettingsManager.checkExternalSettingsChange(CExternalSettingsManager.java:683) at org.eclipse.cdt.internal.core.settings.model.CExternalSettingsManager.processContainerChange(CExternalSettingsManager.java:501) at org.eclipse.cdt.internal.core.settings.model.CExternalSettingsManager$2.run(CExternalSettingsManager.java:615) at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager$5.run(CProjectDescriptionManager.java:508) at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2292) at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.runAtomic(CProjectDescriptionManager.java:504) at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager$4.run(CProjectDescriptionManager.java:484) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-12 23:21:58,938 INFO L306 CDTParser]: Found 1 translation units. [2021-11-12 23:21:58,938 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/sv-benchmarks/c/combinations/Problem05_label49+token_ring.12.cil-1.c [2021-11-12 23:21:59,007 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/data/e5a245e97/7486f1ee98bb4cfc9340afeb314f985a/FLAGde69684a4 [2021-11-12 23:21:59,497 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/data/e5a245e97/7486f1ee98bb4cfc9340afeb314f985a [2021-11-12 23:21:59,500 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-12 23:21:59,502 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-12 23:21:59,505 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-12 23:21:59,507 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-12 23:21:59,512 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-12 23:21:59,513 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 11:21:59" (1/1) ... [2021-11-12 23:21:59,515 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@56fbd2e7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:21:59, skipping insertion in model container [2021-11-12 23:21:59,515 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 11:21:59" (1/1) ... [2021-11-12 23:21:59,523 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-12 23:21:59,823 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-12 23:22:02,909 WARN L228 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_155bc169-7697-4cfe-8821-74073df59442/sv-benchmarks/c/combinations/Problem05_label49+token_ring.12.cil-1.c[380593,380606] [2021-11-12 23:22:02,949 WARN L228 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_155bc169-7697-4cfe-8821-74073df59442/sv-benchmarks/c/combinations/Problem05_label49+token_ring.12.cil-1.c[383339,383352] [2021-11-12 23:22:03,407 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 23:22:03,421 INFO L203 MainTranslator]: Completed pre-run [2021-11-12 23:22:04,931 WARN L228 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_155bc169-7697-4cfe-8821-74073df59442/sv-benchmarks/c/combinations/Problem05_label49+token_ring.12.cil-1.c[380593,380606] [2021-11-12 23:22:04,942 WARN L228 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_155bc169-7697-4cfe-8821-74073df59442/sv-benchmarks/c/combinations/Problem05_label49+token_ring.12.cil-1.c[383339,383352] [2021-11-12 23:22:05,002 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 23:22:05,110 INFO L208 MainTranslator]: Completed translation [2021-11-12 23:22:05,110 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:22:05 WrapperNode [2021-11-12 23:22:05,111 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-12 23:22:05,112 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-12 23:22:05,112 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-12 23:22:05,113 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-12 23:22:05,122 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:22:05" (1/1) ... [2021-11-12 23:22:05,314 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:22:05" (1/1) ... [2021-11-12 23:22:05,821 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-12 23:22:05,822 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-12 23:22:05,822 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-12 23:22:05,823 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-12 23:22:05,833 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:22:05" (1/1) ... [2021-11-12 23:22:05,835 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:22:05" (1/1) ... [2021-11-12 23:22:06,074 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:22:05" (1/1) ... [2021-11-12 23:22:06,074 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:22:05" (1/1) ... [2021-11-12 23:22:06,365 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:22:05" (1/1) ... [2021-11-12 23:22:06,425 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:22:05" (1/1) ... [2021-11-12 23:22:06,479 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:22:05" (1/1) ... [2021-11-12 23:22:06,679 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-12 23:22:06,681 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-12 23:22:06,681 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-12 23:22:06,681 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-12 23:22:06,688 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:22:05" (1/1) ... [2021-11-12 23:22:06,697 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 23:22:06,725 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:22:06,769 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-12 23:22:06,833 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-12 23:22:06,897 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-12 23:22:06,898 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2021-11-12 23:22:06,898 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2021-11-12 23:22:06,898 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-12 23:22:06,898 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-12 23:22:06,898 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2021-11-12 23:22:06,899 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2021-11-12 23:22:06,899 INFO L130 BoogieDeclarations]: Found specification of procedure error [2021-11-12 23:22:06,899 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2021-11-12 23:22:06,899 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2021-11-12 23:22:06,899 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2021-11-12 23:22:06,899 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2021-11-12 23:22:06,899 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2021-11-12 23:22:06,900 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2021-11-12 23:22:06,900 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2021-11-12 23:22:06,900 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-12 23:22:06,900 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-12 23:22:06,900 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-12 23:22:20,404 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-12 23:22:20,404 INFO L299 CfgBuilder]: Removed 16 assume(true) statements. [2021-11-12 23:22:20,411 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 11:22:20 BoogieIcfgContainer [2021-11-12 23:22:20,411 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-12 23:22:20,414 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-12 23:22:20,414 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-12 23:22:20,418 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-12 23:22:20,418 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 11:21:59" (1/3) ... [2021-11-12 23:22:20,419 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@66c31bef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 11:22:20, skipping insertion in model container [2021-11-12 23:22:20,419 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:22:05" (2/3) ... [2021-11-12 23:22:20,420 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@66c31bef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 11:22:20, skipping insertion in model container [2021-11-12 23:22:20,420 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 11:22:20" (3/3) ... [2021-11-12 23:22:20,421 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem05_label49+token_ring.12.cil-1.c [2021-11-12 23:22:20,428 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-12 23:22:20,428 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-12 23:22:20,499 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-12 23:22:20,508 INFO L339 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, mLoopAccelerationTechnique=FAST_UPR [2021-11-12 23:22:20,508 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-12 23:22:20,593 INFO L276 IsEmpty]: Start isEmpty. Operand has 1837 states, 1799 states have (on average 1.9560867148415786) internal successors, (3519), 1804 states have internal predecessors, (3519), 28 states have call successors, (28), 7 states have call predecessors, (28), 7 states have return successors, (28), 27 states have call predecessors, (28), 28 states have call successors, (28) [2021-11-12 23:22:20,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-12 23:22:20,608 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:22:20,609 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:22:20,610 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:22:20,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:22:20,616 INFO L85 PathProgramCache]: Analyzing trace with hash 1560125148, now seen corresponding path program 1 times [2021-11-12 23:22:20,639 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:22:20,640 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [398867998] [2021-11-12 23:22:20,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:22:20,642 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:22:20,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:22:21,261 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:22:21,261 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:22:21,262 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [398867998] [2021-11-12 23:22:21,263 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [398867998] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:22:21,263 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:22:21,263 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-12 23:22:21,265 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [669448261] [2021-11-12 23:22:21,280 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:22:21,285 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 23:22:21,285 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:22:21,349 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 23:22:21,350 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-12 23:22:21,361 INFO L87 Difference]: Start difference. First operand has 1837 states, 1799 states have (on average 1.9560867148415786) internal successors, (3519), 1804 states have internal predecessors, (3519), 28 states have call successors, (28), 7 states have call predecessors, (28), 7 states have return successors, (28), 27 states have call predecessors, (28), 28 states have call successors, (28) Second operand has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-12 23:22:22,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:22:22,860 INFO L93 Difference]: Finished difference Result 3844 states and 7447 transitions. [2021-11-12 23:22:22,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 23:22:22,863 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 68 [2021-11-12 23:22:22,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:22:22,893 INFO L225 Difference]: With dead ends: 3844 [2021-11-12 23:22:22,893 INFO L226 Difference]: Without dead ends: 2006 [2021-11-12 23:22:22,904 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-12 23:22:22,908 INFO L933 BasicCegarLoop]: 3518 mSDtfsCounter, 3787 mSDsluCounter, 3727 mSDsCounter, 0 mSdLazyCounter, 730 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 954.72ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3787 SdHoareTripleChecker+Valid, 6936 SdHoareTripleChecker+Invalid, 744 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 51.13ms SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 730 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1192.11ms IncrementalHoareTripleChecker+Time [2021-11-12 23:22:22,910 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3787 Valid, 6936 Invalid, 744 Unknown, 0 Unchecked, 51.13ms Time], IncrementalHoareTripleChecker [14 Valid, 730 Invalid, 0 Unknown, 0 Unchecked, 1192.11ms Time] [2021-11-12 23:22:22,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2006 states. [2021-11-12 23:22:23,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2006 to 2005. [2021-11-12 23:22:23,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2005 states, 1941 states have (on average 1.919629057187017) internal successors, (3726), 1945 states have internal predecessors, (3726), 50 states have call successors, (50), 13 states have call predecessors, (50), 12 states have return successors, (48), 47 states have call predecessors, (48), 48 states have call successors, (48) [2021-11-12 23:22:23,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2005 states to 2005 states and 3824 transitions. [2021-11-12 23:22:23,088 INFO L78 Accepts]: Start accepts. Automaton has 2005 states and 3824 transitions. Word has length 68 [2021-11-12 23:22:23,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:22:23,089 INFO L470 AbstractCegarLoop]: Abstraction has 2005 states and 3824 transitions. [2021-11-12 23:22:23,089 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.25) internal successors, (57), 4 states have internal predecessors, (57), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-12 23:22:23,090 INFO L276 IsEmpty]: Start isEmpty. Operand 2005 states and 3824 transitions. [2021-11-12 23:22:23,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-12 23:22:23,103 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:22:23,103 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:22:23,104 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-12 23:22:23,104 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:22:23,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:22:23,105 INFO L85 PathProgramCache]: Analyzing trace with hash -1848614849, now seen corresponding path program 1 times [2021-11-12 23:22:23,105 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:22:23,106 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1349420450] [2021-11-12 23:22:23,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:22:23,107 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:22:23,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:22:23,340 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 23:22:23,341 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:22:23,341 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1349420450] [2021-11-12 23:22:23,341 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1349420450] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:22:23,342 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [335538714] [2021-11-12 23:22:23,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:22:23,343 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:22:23,343 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:22:23,345 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:22:23,363 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-12 23:22:23,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:22:23,639 INFO L263 TraceCheckSpWp]: Trace formula consists of 1063 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:22:23,652 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:22:24,042 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-12 23:22:24,042 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:22:24,484 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-12 23:22:24,487 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [335538714] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:22:24,489 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:22:24,489 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-12 23:22:24,491 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2055132816] [2021-11-12 23:22:24,494 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:22:24,496 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:22:24,497 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:22:24,497 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:22:24,498 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:22:24,503 INFO L87 Difference]: Start difference. First operand 2005 states and 3824 transitions. Second operand has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 2 states have internal predecessors, (103), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:22:25,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:22:25,121 INFO L93 Difference]: Finished difference Result 2716 states and 4939 transitions. [2021-11-12 23:22:25,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:22:25,122 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 2 states have internal predecessors, (103), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2021-11-12 23:22:25,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:22:25,152 INFO L225 Difference]: With dead ends: 2716 [2021-11-12 23:22:25,152 INFO L226 Difference]: Without dead ends: 2357 [2021-11-12 23:22:25,155 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 271 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:22:25,158 INFO L933 BasicCegarLoop]: 3357 mSDtfsCounter, 3515 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 392.45ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3515 SdHoareTripleChecker+Valid, 3589 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 17.01ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 477.65ms IncrementalHoareTripleChecker+Time [2021-11-12 23:22:25,160 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3515 Valid, 3589 Invalid, 321 Unknown, 0 Unchecked, 17.01ms Time], IncrementalHoareTripleChecker [2 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 477.65ms Time] [2021-11-12 23:22:25,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2357 states. [2021-11-12 23:22:25,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2357 to 2351. [2021-11-12 23:22:25,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2351 states, 2233 states have (on average 1.8669950738916257) internal successors, (4169), 2238 states have internal predecessors, (4169), 92 states have call successors, (92), 25 states have call predecessors, (92), 24 states have return successors, (90), 88 states have call predecessors, (90), 90 states have call successors, (90) [2021-11-12 23:22:25,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2351 states to 2351 states and 4351 transitions. [2021-11-12 23:22:25,297 INFO L78 Accepts]: Start accepts. Automaton has 2351 states and 4351 transitions. Word has length 137 [2021-11-12 23:22:25,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:22:25,301 INFO L470 AbstractCegarLoop]: Abstraction has 2351 states and 4351 transitions. [2021-11-12 23:22:25,302 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.333333333333336) internal successors, (103), 2 states have internal predecessors, (103), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:22:25,302 INFO L276 IsEmpty]: Start isEmpty. Operand 2351 states and 4351 transitions. [2021-11-12 23:22:25,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-12 23:22:25,317 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:22:25,318 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:22:25,354 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-12 23:22:25,527 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:22:25,528 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:22:25,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:22:25,529 INFO L85 PathProgramCache]: Analyzing trace with hash -1819728609, now seen corresponding path program 1 times [2021-11-12 23:22:25,529 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:22:25,529 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2139232593] [2021-11-12 23:22:25,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:22:25,530 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:22:25,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:22:25,656 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 23:22:25,657 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:22:25,657 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2139232593] [2021-11-12 23:22:25,661 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2139232593] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:22:25,662 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [689249978] [2021-11-12 23:22:25,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:22:25,662 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:22:25,662 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:22:25,663 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:22:25,683 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-12 23:22:25,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:22:25,961 INFO L263 TraceCheckSpWp]: Trace formula consists of 1057 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:22:25,969 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:22:26,411 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-12 23:22:26,411 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:22:26,766 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-12 23:22:26,767 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [689249978] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:22:26,767 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:22:26,767 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-12 23:22:26,768 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [414162429] [2021-11-12 23:22:26,768 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:22:26,770 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:22:26,770 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:22:26,771 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:22:26,772 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:22:26,772 INFO L87 Difference]: Start difference. First operand 2351 states and 4351 transitions. Second operand has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 2 states have internal predecessors, (109), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:22:27,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:22:27,434 INFO L93 Difference]: Finished difference Result 3748 states and 6538 transitions. [2021-11-12 23:22:27,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:22:27,436 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 2 states have internal predecessors, (109), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2021-11-12 23:22:27,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:22:27,464 INFO L225 Difference]: With dead ends: 3748 [2021-11-12 23:22:27,464 INFO L226 Difference]: Without dead ends: 3043 [2021-11-12 23:22:27,471 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 271 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:22:27,475 INFO L933 BasicCegarLoop]: 3317 mSDtfsCounter, 3509 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 315 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 407.68ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3509 SdHoareTripleChecker+Valid, 3549 SdHoareTripleChecker+Invalid, 317 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 16.71ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 315 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 489.13ms IncrementalHoareTripleChecker+Time [2021-11-12 23:22:27,477 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3509 Valid, 3549 Invalid, 317 Unknown, 0 Unchecked, 16.71ms Time], IncrementalHoareTripleChecker [2 Valid, 315 Invalid, 0 Unknown, 0 Unchecked, 489.13ms Time] [2021-11-12 23:22:27,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3043 states. [2021-11-12 23:22:27,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3043 to 3035. [2021-11-12 23:22:27,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3035 states, 2811 states have (on average 1.7940234791889007) internal successors, (5043), 2818 states have internal predecessors, (5043), 174 states have call successors, (174), 49 states have call predecessors, (174), 48 states have return successors, (172), 168 states have call predecessors, (172), 172 states have call successors, (172) [2021-11-12 23:22:27,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3035 states to 3035 states and 5389 transitions. [2021-11-12 23:22:27,651 INFO L78 Accepts]: Start accepts. Automaton has 3035 states and 5389 transitions. Word has length 137 [2021-11-12 23:22:27,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:22:27,652 INFO L470 AbstractCegarLoop]: Abstraction has 3035 states and 5389 transitions. [2021-11-12 23:22:27,652 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 2 states have internal predecessors, (109), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:22:27,652 INFO L276 IsEmpty]: Start isEmpty. Operand 3035 states and 5389 transitions. [2021-11-12 23:22:27,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-12 23:22:27,661 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:22:27,662 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:22:27,713 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-12 23:22:27,884 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:22:27,885 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:22:27,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:22:27,885 INFO L85 PathProgramCache]: Analyzing trace with hash 1827607039, now seen corresponding path program 1 times [2021-11-12 23:22:27,886 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:22:27,886 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1482040474] [2021-11-12 23:22:27,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:22:27,886 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:22:27,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:22:27,995 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 23:22:27,996 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:22:27,997 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1482040474] [2021-11-12 23:22:27,997 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1482040474] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:22:28,001 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [447007586] [2021-11-12 23:22:28,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:22:28,003 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:22:28,003 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:22:28,006 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:22:28,007 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-12 23:22:28,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:22:28,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 1051 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:22:28,280 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:22:28,719 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-12 23:22:28,720 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:22:29,123 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-12 23:22:29,123 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [447007586] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:22:29,123 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:22:29,124 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-12 23:22:29,124 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [298738340] [2021-11-12 23:22:29,124 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:22:29,125 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:22:29,126 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:22:29,126 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:22:29,128 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:22:29,128 INFO L87 Difference]: Start difference. First operand 3035 states and 5389 transitions. Second operand has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 2 states have internal predecessors, (85), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:22:29,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:22:29,848 INFO L93 Difference]: Finished difference Result 5788 states and 9686 transitions. [2021-11-12 23:22:29,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:22:29,853 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 2 states have internal predecessors, (85), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2021-11-12 23:22:29,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:22:29,893 INFO L225 Difference]: With dead ends: 5788 [2021-11-12 23:22:29,894 INFO L226 Difference]: Without dead ends: 4399 [2021-11-12 23:22:29,905 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 271 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:22:29,908 INFO L933 BasicCegarLoop]: 3344 mSDtfsCounter, 3533 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 316 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 431.38ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3533 SdHoareTripleChecker+Valid, 3576 SdHoareTripleChecker+Invalid, 318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 13.53ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 316 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 520.32ms IncrementalHoareTripleChecker+Time [2021-11-12 23:22:29,910 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3533 Valid, 3576 Invalid, 318 Unknown, 0 Unchecked, 13.53ms Time], IncrementalHoareTripleChecker [2 Valid, 316 Invalid, 0 Unknown, 0 Unchecked, 520.32ms Time] [2021-11-12 23:22:29,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4399 states. [2021-11-12 23:22:30,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4399 to 4387. [2021-11-12 23:22:30,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4387 states, 3955 states have (on average 1.710998735777497) internal successors, (6767), 3966 states have internal predecessors, (6767), 334 states have call successors, (334), 97 states have call predecessors, (334), 96 states have return successors, (332), 324 states have call predecessors, (332), 332 states have call successors, (332) [2021-11-12 23:22:30,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4387 states to 4387 states and 7433 transitions. [2021-11-12 23:22:30,201 INFO L78 Accepts]: Start accepts. Automaton has 4387 states and 7433 transitions. Word has length 137 [2021-11-12 23:22:30,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:22:30,202 INFO L470 AbstractCegarLoop]: Abstraction has 4387 states and 7433 transitions. [2021-11-12 23:22:30,202 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.333333333333332) internal successors, (85), 2 states have internal predecessors, (85), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:22:30,203 INFO L276 IsEmpty]: Start isEmpty. Operand 4387 states and 7433 transitions. [2021-11-12 23:22:30,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-12 23:22:30,215 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:22:30,216 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:22:30,263 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-12 23:22:30,431 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:22:30,431 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:22:30,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:22:30,432 INFO L85 PathProgramCache]: Analyzing trace with hash -661365025, now seen corresponding path program 1 times [2021-11-12 23:22:30,432 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:22:30,432 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [536735745] [2021-11-12 23:22:30,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:22:30,433 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:22:30,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:22:30,582 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 23:22:30,582 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:22:30,582 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [536735745] [2021-11-12 23:22:30,582 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [536735745] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:22:30,583 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1990329541] [2021-11-12 23:22:30,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:22:30,583 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:22:30,584 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:22:30,585 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:22:30,607 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-12 23:22:30,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:22:30,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 1045 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:22:30,888 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:22:31,289 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-12 23:22:31,290 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:22:31,671 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-12 23:22:31,671 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1990329541] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:22:31,671 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:22:31,672 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-12 23:22:31,672 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [136355363] [2021-11-12 23:22:31,672 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:22:31,673 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:22:31,673 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:22:31,673 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:22:31,674 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:22:31,674 INFO L87 Difference]: Start difference. First operand 4387 states and 7433 transitions. Second operand has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 2 states have internal predecessors, (91), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:22:32,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:22:32,429 INFO L93 Difference]: Finished difference Result 9820 states and 15882 transitions. [2021-11-12 23:22:32,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:22:32,430 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 2 states have internal predecessors, (91), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2021-11-12 23:22:32,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:22:32,499 INFO L225 Difference]: With dead ends: 9820 [2021-11-12 23:22:32,499 INFO L226 Difference]: Without dead ends: 7079 [2021-11-12 23:22:32,516 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 271 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:22:32,519 INFO L933 BasicCegarLoop]: 3317 mSDtfsCounter, 3527 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 315 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 402.34ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3527 SdHoareTripleChecker+Valid, 3549 SdHoareTripleChecker+Invalid, 317 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 11.29ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 315 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 491.61ms IncrementalHoareTripleChecker+Time [2021-11-12 23:22:32,519 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3527 Valid, 3549 Invalid, 317 Unknown, 0 Unchecked, 11.29ms Time], IncrementalHoareTripleChecker [2 Valid, 315 Invalid, 0 Unknown, 0 Unchecked, 491.61ms Time] [2021-11-12 23:22:32,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7079 states. [2021-11-12 23:22:32,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7079 to 7059. [2021-11-12 23:22:32,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7059 states, 6219 states have (on average 1.6348287506029908) internal successors, (10167), 6238 states have internal predecessors, (10167), 646 states have call successors, (646), 193 states have call predecessors, (646), 192 states have return successors, (644), 628 states have call predecessors, (644), 644 states have call successors, (644) [2021-11-12 23:22:33,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7059 states to 7059 states and 11457 transitions. [2021-11-12 23:22:33,037 INFO L78 Accepts]: Start accepts. Automaton has 7059 states and 11457 transitions. Word has length 137 [2021-11-12 23:22:33,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:22:33,038 INFO L470 AbstractCegarLoop]: Abstraction has 7059 states and 11457 transitions. [2021-11-12 23:22:33,038 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 2 states have internal predecessors, (91), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:22:33,039 INFO L276 IsEmpty]: Start isEmpty. Operand 7059 states and 11457 transitions. [2021-11-12 23:22:33,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-12 23:22:33,057 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:22:33,058 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:22:33,098 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-12 23:22:33,271 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:22:33,272 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:22:33,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:22:33,273 INFO L85 PathProgramCache]: Analyzing trace with hash 166515647, now seen corresponding path program 1 times [2021-11-12 23:22:33,273 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:22:33,273 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [118028235] [2021-11-12 23:22:33,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:22:33,273 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:22:33,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:22:33,397 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 23:22:33,398 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:22:33,398 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [118028235] [2021-11-12 23:22:33,398 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [118028235] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:22:33,398 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [191535549] [2021-11-12 23:22:33,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:22:33,399 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:22:33,399 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:22:33,400 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:22:33,419 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-12 23:22:33,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:22:33,667 INFO L263 TraceCheckSpWp]: Trace formula consists of 1039 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:22:33,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:22:33,949 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-12 23:22:33,949 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:22:34,277 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-12 23:22:34,277 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [191535549] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:22:34,278 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:22:34,278 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-12 23:22:34,278 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [575451662] [2021-11-12 23:22:34,278 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:22:34,279 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:22:34,279 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:22:34,280 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:22:34,280 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:22:34,280 INFO L87 Difference]: Start difference. First operand 7059 states and 11457 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 states have internal predecessors, (82), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:22:35,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:22:35,169 INFO L93 Difference]: Finished difference Result 17788 states and 28074 transitions. [2021-11-12 23:22:35,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:22:35,170 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 states have internal predecessors, (82), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2021-11-12 23:22:35,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:22:35,281 INFO L225 Difference]: With dead ends: 17788 [2021-11-12 23:22:35,282 INFO L226 Difference]: Without dead ends: 12375 [2021-11-12 23:22:35,316 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 271 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:22:35,317 INFO L933 BasicCegarLoop]: 3353 mSDtfsCounter, 3536 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 418.66ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3536 SdHoareTripleChecker+Valid, 3585 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 13.14ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 502.97ms IncrementalHoareTripleChecker+Time [2021-11-12 23:22:35,318 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3536 Valid, 3585 Invalid, 321 Unknown, 0 Unchecked, 13.14ms Time], IncrementalHoareTripleChecker [2 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 502.97ms Time] [2021-11-12 23:22:35,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12375 states. [2021-11-12 23:22:35,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12375 to 12339. [2021-11-12 23:22:35,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12339 states, 10699 states have (on average 1.5768763435835125) internal successors, (16871), 10734 states have internal predecessors, (16871), 1254 states have call successors, (1254), 385 states have call predecessors, (1254), 384 states have return successors, (1252), 1220 states have call predecessors, (1252), 1252 states have call successors, (1252) [2021-11-12 23:22:36,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12339 states to 12339 states and 19377 transitions. [2021-11-12 23:22:36,193 INFO L78 Accepts]: Start accepts. Automaton has 12339 states and 19377 transitions. Word has length 137 [2021-11-12 23:22:36,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:22:36,194 INFO L470 AbstractCegarLoop]: Abstraction has 12339 states and 19377 transitions. [2021-11-12 23:22:36,195 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 states have internal predecessors, (82), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:22:36,195 INFO L276 IsEmpty]: Start isEmpty. Operand 12339 states and 19377 transitions. [2021-11-12 23:22:36,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-12 23:22:36,232 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:22:36,233 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:22:36,279 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-12 23:22:36,447 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-12 23:22:36,448 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:22:36,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:22:36,448 INFO L85 PathProgramCache]: Analyzing trace with hash -484844833, now seen corresponding path program 1 times [2021-11-12 23:22:36,449 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:22:36,449 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [568077671] [2021-11-12 23:22:36,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:22:36,449 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:22:36,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:22:36,564 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 23:22:36,565 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:22:36,565 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [568077671] [2021-11-12 23:22:36,565 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [568077671] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:22:36,565 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1297690897] [2021-11-12 23:22:36,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:22:36,566 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:22:36,566 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:22:36,567 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:22:36,583 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-12 23:22:36,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:22:36,852 INFO L263 TraceCheckSpWp]: Trace formula consists of 1033 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:22:36,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:22:37,233 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 38 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-12 23:22:37,234 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:22:37,588 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-12 23:22:37,588 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1297690897] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:22:37,588 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:22:37,589 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-12 23:22:37,590 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1804838221] [2021-11-12 23:22:37,590 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:22:37,591 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:22:37,591 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:22:37,591 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:22:37,592 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:22:37,592 INFO L87 Difference]: Start difference. First operand 12339 states and 19377 transitions. Second operand has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 2 states have internal predecessors, (112), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:22:38,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:22:38,928 INFO L93 Difference]: Finished difference Result 33532 states and 52058 transitions. [2021-11-12 23:22:38,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:22:38,929 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 2 states have internal predecessors, (112), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2021-11-12 23:22:38,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:22:39,051 INFO L225 Difference]: With dead ends: 33532 [2021-11-12 23:22:39,051 INFO L226 Difference]: Without dead ends: 22839 [2021-11-12 23:22:39,098 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 271 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:22:39,100 INFO L933 BasicCegarLoop]: 3317 mSDtfsCounter, 3506 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 315 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 404.42ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3506 SdHoareTripleChecker+Valid, 3549 SdHoareTripleChecker+Invalid, 317 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 12.18ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 315 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 481.23ms IncrementalHoareTripleChecker+Time [2021-11-12 23:22:39,100 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3506 Valid, 3549 Invalid, 317 Unknown, 0 Unchecked, 12.18ms Time], IncrementalHoareTripleChecker [2 Valid, 315 Invalid, 0 Unknown, 0 Unchecked, 481.23ms Time] [2021-11-12 23:22:39,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22839 states. [2021-11-12 23:22:40,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22839 to 22771. [2021-11-12 23:22:40,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22771 states, 19563 states have (on average 1.537954301487502) internal successors, (30087), 19630 states have internal predecessors, (30087), 2438 states have call successors, (2438), 769 states have call predecessors, (2438), 768 states have return successors, (2436), 2372 states have call predecessors, (2436), 2436 states have call successors, (2436) [2021-11-12 23:22:40,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22771 states to 22771 states and 34961 transitions. [2021-11-12 23:22:40,515 INFO L78 Accepts]: Start accepts. Automaton has 22771 states and 34961 transitions. Word has length 137 [2021-11-12 23:22:40,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:22:40,515 INFO L470 AbstractCegarLoop]: Abstraction has 22771 states and 34961 transitions. [2021-11-12 23:22:40,516 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 2 states have internal predecessors, (112), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:22:40,516 INFO L276 IsEmpty]: Start isEmpty. Operand 22771 states and 34961 transitions. [2021-11-12 23:22:40,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-12 23:22:40,559 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:22:40,559 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:22:40,607 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-12 23:22:40,775 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:22:40,775 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:22:40,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:22:40,776 INFO L85 PathProgramCache]: Analyzing trace with hash -2098849281, now seen corresponding path program 1 times [2021-11-12 23:22:40,776 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:22:40,776 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1264104692] [2021-11-12 23:22:40,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:22:40,777 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:22:40,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:22:40,930 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 23:22:40,931 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:22:40,931 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1264104692] [2021-11-12 23:22:40,931 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1264104692] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:22:40,931 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2021825905] [2021-11-12 23:22:40,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:22:40,932 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:22:40,932 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:22:40,936 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:22:40,955 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-12 23:22:41,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:22:41,224 INFO L263 TraceCheckSpWp]: Trace formula consists of 1027 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:22:41,228 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:22:41,491 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-12 23:22:41,492 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:22:41,754 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-12 23:22:41,755 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2021825905] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:22:41,755 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:22:41,755 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-12 23:22:41,756 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [205661407] [2021-11-12 23:22:41,756 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:22:41,756 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:22:41,757 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:22:41,757 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:22:41,757 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:22:41,758 INFO L87 Difference]: Start difference. First operand 22771 states and 34961 transitions. Second operand has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 2 states have internal predecessors, (97), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:22:43,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:22:43,607 INFO L93 Difference]: Finished difference Result 64636 states and 99226 transitions. [2021-11-12 23:22:43,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:22:43,608 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 2 states have internal predecessors, (97), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 137 [2021-11-12 23:22:43,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:22:43,951 INFO L225 Difference]: With dead ends: 64636 [2021-11-12 23:22:43,951 INFO L226 Difference]: Without dead ends: 43511 [2021-11-12 23:22:44,021 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 271 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:22:44,022 INFO L933 BasicCegarLoop]: 3317 mSDtfsCounter, 3521 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 315 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 479.15ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3521 SdHoareTripleChecker+Valid, 3549 SdHoareTripleChecker+Invalid, 317 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 11.81ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 315 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 591.62ms IncrementalHoareTripleChecker+Time [2021-11-12 23:22:44,023 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3521 Valid, 3549 Invalid, 317 Unknown, 0 Unchecked, 11.81ms Time], IncrementalHoareTripleChecker [2 Valid, 315 Invalid, 0 Unknown, 0 Unchecked, 591.62ms Time] [2021-11-12 23:22:44,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43511 states. [2021-11-12 23:22:45,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43511 to 43379. [2021-11-12 23:22:45,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43379 states, 37099 states have (on average 1.5131135610124262) internal successors, (56135), 37230 states have internal predecessors, (56135), 4742 states have call successors, (4742), 1537 states have call predecessors, (4742), 1536 states have return successors, (4740), 4612 states have call predecessors, (4740), 4740 states have call successors, (4740) [2021-11-12 23:22:46,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43379 states to 43379 states and 65617 transitions. [2021-11-12 23:22:46,089 INFO L78 Accepts]: Start accepts. Automaton has 43379 states and 65617 transitions. Word has length 137 [2021-11-12 23:22:46,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:22:46,089 INFO L470 AbstractCegarLoop]: Abstraction has 43379 states and 65617 transitions. [2021-11-12 23:22:46,090 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 2 states have internal predecessors, (97), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:22:46,090 INFO L276 IsEmpty]: Start isEmpty. Operand 43379 states and 65617 transitions. [2021-11-12 23:22:46,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-12 23:22:46,180 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:22:46,180 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:22:46,227 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-12 23:22:46,395 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:22:46,395 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:22:46,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:22:46,396 INFO L85 PathProgramCache]: Analyzing trace with hash -378554657, now seen corresponding path program 1 times [2021-11-12 23:22:46,396 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:22:46,396 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1171367447] [2021-11-12 23:22:46,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:22:46,397 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:22:46,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:22:46,566 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-12 23:22:46,567 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:22:46,567 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1171367447] [2021-11-12 23:22:46,567 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1171367447] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:22:46,567 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:22:46,568 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-12 23:22:46,568 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1013207456] [2021-11-12 23:22:46,568 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:22:46,569 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 23:22:46,569 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:22:46,569 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 23:22:46,570 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-12 23:22:46,570 INFO L87 Difference]: Start difference. First operand 43379 states and 65617 transitions. Second operand has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-12 23:22:51,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:22:51,236 INFO L93 Difference]: Finished difference Result 147579 states and 220888 transitions. [2021-11-12 23:22:51,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-12 23:22:51,236 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 137 [2021-11-12 23:22:51,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:22:51,988 INFO L225 Difference]: With dead ends: 147579 [2021-11-12 23:22:51,988 INFO L226 Difference]: Without dead ends: 105847 [2021-11-12 23:22:52,135 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-12 23:22:52,138 INFO L933 BasicCegarLoop]: 3319 mSDtfsCounter, 4416 mSDsluCounter, 7096 mSDsCounter, 0 mSdLazyCounter, 936 mSolverCounterSat, 158 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1161.54ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 4437 SdHoareTripleChecker+Valid, 9897 SdHoareTripleChecker+Invalid, 1094 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 35.91ms SdHoareTripleChecker+Time, 158 IncrementalHoareTripleChecker+Valid, 936 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1364.82ms IncrementalHoareTripleChecker+Time [2021-11-12 23:22:52,138 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4437 Valid, 9897 Invalid, 1094 Unknown, 0 Unchecked, 35.91ms Time], IncrementalHoareTripleChecker [158 Valid, 936 Invalid, 0 Unknown, 0 Unchecked, 1364.82ms Time] [2021-11-12 23:22:52,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105847 states. [2021-11-12 23:22:56,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105847 to 83571. [2021-11-12 23:22:56,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83571 states, 71275 states have (on average 1.4969484391441599) internal successors, (106695), 71534 states have internal predecessors, (106695), 9222 states have call successors, (9222), 3073 states have call predecessors, (9222), 3072 states have return successors, (9220), 8964 states have call predecessors, (9220), 9220 states have call successors, (9220) [2021-11-12 23:22:57,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83571 states to 83571 states and 125137 transitions. [2021-11-12 23:22:57,583 INFO L78 Accepts]: Start accepts. Automaton has 83571 states and 125137 transitions. Word has length 137 [2021-11-12 23:22:57,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:22:57,586 INFO L470 AbstractCegarLoop]: Abstraction has 83571 states and 125137 transitions. [2021-11-12 23:22:57,586 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-12 23:22:57,586 INFO L276 IsEmpty]: Start isEmpty. Operand 83571 states and 125137 transitions. [2021-11-12 23:22:57,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-11-12 23:22:57,707 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:22:57,707 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:22:57,707 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-12 23:22:57,708 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:22:57,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:22:57,709 INFO L85 PathProgramCache]: Analyzing trace with hash -455659892, now seen corresponding path program 1 times [2021-11-12 23:22:57,709 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:22:57,709 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1700332048] [2021-11-12 23:22:57,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:22:57,710 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:22:57,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:22:57,864 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 10 proven. 41 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-12 23:22:57,865 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:22:57,865 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1700332048] [2021-11-12 23:22:57,865 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1700332048] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:22:57,865 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [900990510] [2021-11-12 23:22:57,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:22:57,866 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:22:57,866 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:22:57,867 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:22:57,883 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-12 23:22:58,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:22:58,156 INFO L263 TraceCheckSpWp]: Trace formula consists of 1062 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:22:58,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:22:58,560 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 28 proven. 0 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-11-12 23:22:58,561 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:22:58,960 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 24 proven. 0 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-11-12 23:22:58,960 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [900990510] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:22:58,960 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-12 23:22:58,961 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [6] total 8 [2021-11-12 23:22:58,961 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1963410238] [2021-11-12 23:22:58,961 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:22:58,962 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 23:22:58,962 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:22:58,963 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 23:22:58,963 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-11-12 23:22:58,964 INFO L87 Difference]: Start difference. First operand 83571 states and 125137 transitions. Second operand has 4 states, 4 states have (on average 28.5) internal successors, (114), 4 states have internal predecessors, (114), 4 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-12 23:23:03,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:23:03,486 INFO L93 Difference]: Finished difference Result 150007 states and 227156 transitions. [2021-11-12 23:23:03,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 23:23:03,486 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 28.5) internal successors, (114), 4 states have internal predecessors, (114), 4 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 159 [2021-11-12 23:23:03,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:23:04,111 INFO L225 Difference]: With dead ends: 150007 [2021-11-12 23:23:04,111 INFO L226 Difference]: Without dead ends: 108019 [2021-11-12 23:23:04,244 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 324 GetRequests, 318 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-11-12 23:23:04,245 INFO L933 BasicCegarLoop]: 3431 mSDtfsCounter, 149 mSDsluCounter, 7120 mSDsCounter, 0 mSdLazyCounter, 823 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 625.38ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 149 SdHoareTripleChecker+Valid, 10039 SdHoareTripleChecker+Invalid, 825 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 31.31ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 823 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 760.96ms IncrementalHoareTripleChecker+Time [2021-11-12 23:23:04,246 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [149 Valid, 10039 Invalid, 825 Unknown, 0 Unchecked, 31.31ms Time], IncrementalHoareTripleChecker [2 Valid, 823 Invalid, 0 Unknown, 0 Unchecked, 760.96ms Time] [2021-11-12 23:23:04,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108019 states. [2021-11-12 23:23:09,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108019 to 99315. [2021-11-12 23:23:09,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99315 states, 86507 states have (on average 1.5381761013559596) internal successors, (133063), 86766 states have internal predecessors, (133063), 9478 states have call successors, (9478), 3329 states have call predecessors, (9478), 3328 states have return successors, (9476), 9220 states have call predecessors, (9476), 9476 states have call successors, (9476) [2021-11-12 23:23:09,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99315 states to 99315 states and 152017 transitions. [2021-11-12 23:23:09,629 INFO L78 Accepts]: Start accepts. Automaton has 99315 states and 152017 transitions. Word has length 159 [2021-11-12 23:23:09,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:23:09,630 INFO L470 AbstractCegarLoop]: Abstraction has 99315 states and 152017 transitions. [2021-11-12 23:23:09,630 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 28.5) internal successors, (114), 4 states have internal predecessors, (114), 4 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-12 23:23:09,630 INFO L276 IsEmpty]: Start isEmpty. Operand 99315 states and 152017 transitions. [2021-11-12 23:23:09,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2021-11-12 23:23:09,918 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:23:09,918 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:23:09,966 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-12 23:23:10,143 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:23:10,143 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:23:10,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:23:10,144 INFO L85 PathProgramCache]: Analyzing trace with hash -1983419187, now seen corresponding path program 1 times [2021-11-12 23:23:10,144 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:23:10,145 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1920962992] [2021-11-12 23:23:10,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:23:10,145 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:23:10,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:23:10,303 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 10 proven. 81 refuted. 0 times theorem prover too weak. 68 trivial. 0 not checked. [2021-11-12 23:23:10,303 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:23:10,303 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1920962992] [2021-11-12 23:23:10,304 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1920962992] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:23:10,304 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [809004741] [2021-11-12 23:23:10,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:23:10,304 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:23:10,305 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:23:10,308 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:23:10,327 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_155bc169-7697-4cfe-8821-74073df59442/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-12 23:23:10,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:23:10,647 INFO L263 TraceCheckSpWp]: Trace formula consists of 1326 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:23:10,652 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:23:11,143 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 101 proven. 0 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-12 23:23:11,144 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:23:11,515 INFO L134 CoverageAnalysis]: Checked inductivity of 159 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2021-11-12 23:23:11,515 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [809004741] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:23:11,515 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-12 23:23:11,516 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 3] imperfect sequences [6] total 7 [2021-11-12 23:23:11,516 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [270748761] [2021-11-12 23:23:11,516 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:23:11,517 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:23:11,518 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:23:11,518 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:23:11,518 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:23:11,519 INFO L87 Difference]: Start difference. First operand 99315 states and 152017 transitions. Second operand has 3 states, 3 states have (on average 60.333333333333336) internal successors, (181), 3 states have internal predecessors, (181), 3 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (19), 3 states have call predecessors, (19), 3 states have call successors, (19) [2021-11-12 23:23:18,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:23:18,693 INFO L93 Difference]: Finished difference Result 293116 states and 452570 transitions. [2021-11-12 23:23:18,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:23:18,694 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 60.333333333333336) internal successors, (181), 3 states have internal predecessors, (181), 3 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (19), 3 states have call predecessors, (19), 3 states have call successors, (19) Word has length 209 [2021-11-12 23:23:18,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:23:19,471 INFO L225 Difference]: With dead ends: 293116 [2021-11-12 23:23:19,471 INFO L226 Difference]: Without dead ends: 195447 [2021-11-12 23:23:19,765 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 424 GetRequests, 418 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:23:19,765 INFO L933 BasicCegarLoop]: 3317 mSDtfsCounter, 3461 mSDsluCounter, 276 mSDsCounter, 0 mSdLazyCounter, 315 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 355.62ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3461 SdHoareTripleChecker+Valid, 3549 SdHoareTripleChecker+Invalid, 317 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 8.47ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 315 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 446.71ms IncrementalHoareTripleChecker+Time [2021-11-12 23:23:19,766 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3461 Valid, 3549 Invalid, 317 Unknown, 0 Unchecked, 8.47ms Time], IncrementalHoareTripleChecker [2 Valid, 315 Invalid, 0 Unknown, 0 Unchecked, 446.71ms Time] [2021-11-12 23:23:19,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195447 states.