./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label42+token_ring.13.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_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/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_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label42+token_ring.13.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/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_5a5b84c4-a8fd-414c-83de-bae1876d2a32/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 8467ffbb1ccc6ad3e7cda0bad7b8fded9577e94940df507be3d09419f9a5a0e1 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-63182f1 [2021-11-12 22:55:31,403 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-12 22:55:31,406 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-12 22:55:31,466 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-12 22:55:31,467 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-12 22:55:31,471 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-12 22:55:31,473 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-12 22:55:31,477 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-12 22:55:31,480 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-12 22:55:31,486 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-12 22:55:31,487 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-12 22:55:31,489 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-12 22:55:31,490 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-12 22:55:31,493 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-12 22:55:31,495 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-12 22:55:31,500 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-12 22:55:31,502 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-12 22:55:31,503 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-12 22:55:31,506 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-12 22:55:31,513 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-12 22:55:31,516 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-12 22:55:31,517 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-12 22:55:31,520 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-12 22:55:31,522 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-12 22:55:31,531 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-12 22:55:31,532 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-12 22:55:31,533 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-12 22:55:31,535 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-12 22:55:31,535 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-12 22:55:31,537 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-12 22:55:31,538 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-12 22:55:31,539 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-12 22:55:31,541 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-12 22:55:31,543 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-12 22:55:31,544 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-12 22:55:31,545 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-12 22:55:31,545 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-12 22:55:31,546 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-12 22:55:31,546 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-12 22:55:31,547 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-12 22:55:31,548 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-12 22:55:31,549 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-12 22:55:31,578 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-12 22:55:31,580 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-12 22:55:31,581 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-12 22:55:31,582 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-12 22:55:31,582 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-12 22:55:31,582 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-12 22:55:31,582 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-12 22:55:31,583 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-12 22:55:31,587 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-12 22:55:31,588 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-12 22:55:31,589 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-12 22:55:31,589 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-12 22:55:31,589 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-12 22:55:31,589 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-12 22:55:31,589 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-12 22:55:31,590 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-12 22:55:31,591 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-12 22:55:31,591 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-12 22:55:31,591 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-12 22:55:31,591 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-12 22:55:31,592 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-12 22:55:31,592 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-12 22:55:31,592 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-12 22:55:31,592 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-12 22:55:31,592 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-12 22:55:31,593 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-12 22:55:31,593 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-12 22:55:31,593 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-12 22:55:31,593 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-12 22:55:31,594 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-12 22:55:31,594 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-12 22:55:31,594 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 22:55:31,594 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-12 22:55:31,595 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-12 22:55:31,595 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-12 22:55:31,595 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-12 22:55:31,595 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-12 22:55:31,595 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-12 22:55:31,596 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-12 22:55:31,596 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-12 22:55:31,596 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_5a5b84c4-a8fd-414c-83de-bae1876d2a32/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8467ffbb1ccc6ad3e7cda0bad7b8fded9577e94940df507be3d09419f9a5a0e1 [2021-11-12 22:55:31,869 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-12 22:55:31,902 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-12 22:55:31,906 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-12 22:55:31,907 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-12 22:55:31,908 INFO L275 PluginConnector]: CDTParser initialized [2021-11-12 22:55:31,909 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/../../sv-benchmarks/c/combinations/Problem05_label42+token_ring.13.cil-1.c [2021-11-12 22:55:32,007 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/data/4a1328f23/e78c5ec27e6d4f7f84c61f6f29d39e8e/FLAG576981e20 [2021-11-12 22:55:33,104 INFO L306 CDTParser]: Found 1 translation units. [2021-11-12 22:55:33,105 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/sv-benchmarks/c/combinations/Problem05_label42+token_ring.13.cil-1.c [2021-11-12 22:55:33,164 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/data/4a1328f23/e78c5ec27e6d4f7f84c61f6f29d39e8e/FLAG576981e20 [2021-11-12 22:55:33,378 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/data/4a1328f23/e78c5ec27e6d4f7f84c61f6f29d39e8e [2021-11-12 22:55:33,381 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-12 22:55:33,385 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-12 22:55:33,387 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-12 22:55:33,388 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-12 22:55:33,391 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-12 22:55:33,393 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 10:55:33" (1/1) ... [2021-11-12 22:55:33,394 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2e1f115e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:55:33, skipping insertion in model container [2021-11-12 22:55:33,394 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 10:55:33" (1/1) ... [2021-11-12 22:55:33,403 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-12 22:55:33,759 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-12 22:55:36,214 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_5a5b84c4-a8fd-414c-83de-bae1876d2a32/sv-benchmarks/c/combinations/Problem05_label42+token_ring.13.cil-1.c[378560,378573] [2021-11-12 22:55:36,256 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_5a5b84c4-a8fd-414c-83de-bae1876d2a32/sv-benchmarks/c/combinations/Problem05_label42+token_ring.13.cil-1.c[383339,383352] [2021-11-12 22:55:36,686 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 22:55:36,697 INFO L203 MainTranslator]: Completed pre-run [2021-11-12 22:55:37,939 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_5a5b84c4-a8fd-414c-83de-bae1876d2a32/sv-benchmarks/c/combinations/Problem05_label42+token_ring.13.cil-1.c[378560,378573] [2021-11-12 22:55:37,947 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_5a5b84c4-a8fd-414c-83de-bae1876d2a32/sv-benchmarks/c/combinations/Problem05_label42+token_ring.13.cil-1.c[383339,383352] [2021-11-12 22:55:38,035 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 22:55:38,133 INFO L208 MainTranslator]: Completed translation [2021-11-12 22:55:38,133 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:55:38 WrapperNode [2021-11-12 22:55:38,134 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-12 22:55:38,135 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-12 22:55:38,135 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-12 22:55:38,135 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-12 22:55:38,142 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:55:38" (1/1) ... [2021-11-12 22:55:38,255 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:55:38" (1/1) ... [2021-11-12 22:55:38,715 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-12 22:55:38,716 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-12 22:55:38,716 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-12 22:55:38,716 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-12 22:55:38,726 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:55:38" (1/1) ... [2021-11-12 22:55:38,845 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:55:38" (1/1) ... [2021-11-12 22:55:38,948 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:55:38" (1/1) ... [2021-11-12 22:55:38,948 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:55:38" (1/1) ... [2021-11-12 22:55:39,164 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:55:38" (1/1) ... [2021-11-12 22:55:39,265 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:55:38" (1/1) ... [2021-11-12 22:55:39,302 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:55:38" (1/1) ... [2021-11-12 22:55:39,473 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-12 22:55:39,474 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-12 22:55:39,474 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-12 22:55:39,475 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-12 22:55:39,478 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:55:38" (1/1) ... [2021-11-12 22:55:39,500 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 22:55:39,522 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:55:39,549 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-12 22:55:39,582 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-12 22:55:39,601 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-12 22:55:39,602 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2021-11-12 22:55:39,602 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2021-11-12 22:55:39,602 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-12 22:55:39,602 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-12 22:55:39,602 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2021-11-12 22:55:39,603 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2021-11-12 22:55:39,603 INFO L130 BoogieDeclarations]: Found specification of procedure error [2021-11-12 22:55:39,603 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2021-11-12 22:55:39,603 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2021-11-12 22:55:39,603 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2021-11-12 22:55:39,603 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2021-11-12 22:55:39,604 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2021-11-12 22:55:39,604 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2021-11-12 22:55:39,604 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2021-11-12 22:55:39,604 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-12 22:55:39,604 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-12 22:55:39,604 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-12 22:55:51,345 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-12 22:55:51,345 INFO L299 CfgBuilder]: Removed 17 assume(true) statements. [2021-11-12 22:55:51,351 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 10:55:51 BoogieIcfgContainer [2021-11-12 22:55:51,351 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-12 22:55:51,353 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-12 22:55:51,353 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-12 22:55:51,356 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-12 22:55:51,356 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 10:55:33" (1/3) ... [2021-11-12 22:55:51,357 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6ea13732 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 10:55:51, skipping insertion in model container [2021-11-12 22:55:51,357 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 10:55:38" (2/3) ... [2021-11-12 22:55:51,357 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6ea13732 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 10:55:51, skipping insertion in model container [2021-11-12 22:55:51,357 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 10:55:51" (3/3) ... [2021-11-12 22:55:51,358 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem05_label42+token_ring.13.cil-1.c [2021-11-12 22:55:51,363 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-12 22:55:51,363 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-12 22:55:51,425 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-12 22:55:51,432 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 22:55:51,432 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-12 22:55:51,499 INFO L276 IsEmpty]: Start isEmpty. Operand has 1848 states, 1809 states have (on average 1.9541182974018796) internal successors, (3535), 1814 states have internal predecessors, (3535), 29 states have call successors, (29), 7 states have call predecessors, (29), 7 states have return successors, (29), 28 states have call predecessors, (29), 29 states have call successors, (29) [2021-11-12 22:55:51,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-11-12 22:55:51,511 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:55:51,511 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, 1, 1, 1] [2021-11-12 22:55:51,512 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:55:51,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:55:51,518 INFO L85 PathProgramCache]: Analyzing trace with hash 144636653, now seen corresponding path program 1 times [2021-11-12 22:55:51,527 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:55:51,528 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1144735079] [2021-11-12 22:55:51,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:55:51,529 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:55:51,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:55:51,949 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 22:55:51,962 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:55:51,962 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1144735079] [2021-11-12 22:55:51,963 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1144735079] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 22:55:51,963 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:55:51,963 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-12 22:55:51,965 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1620051553] [2021-11-12 22:55:51,966 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:55:51,970 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 22:55:51,970 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:55:51,996 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 22:55:51,997 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-12 22:55:52,004 INFO L87 Difference]: Start difference. First operand has 1848 states, 1809 states have (on average 1.9541182974018796) internal successors, (3535), 1814 states have internal predecessors, (3535), 29 states have call successors, (29), 7 states have call predecessors, (29), 7 states have return successors, (29), 28 states have call predecessors, (29), 29 states have call successors, (29) Second operand has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 states have internal predecessors, (60), 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 22:55:53,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:55:53,212 INFO L93 Difference]: Finished difference Result 3877 states and 7503 transitions. [2021-11-12 22:55:53,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 22:55:53,214 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 states have internal predecessors, (60), 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 71 [2021-11-12 22:55:53,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:55:53,242 INFO L225 Difference]: With dead ends: 3877 [2021-11-12 22:55:53,242 INFO L226 Difference]: Without dead ends: 2028 [2021-11-12 22:55:53,252 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 22:55:53,256 INFO L933 BasicCegarLoop]: 3548 mSDtfsCounter, 3820 mSDsluCounter, 3759 mSDsCounter, 0 mSdLazyCounter, 746 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 651.61ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3820 SdHoareTripleChecker+Valid, 6992 SdHoareTripleChecker+Invalid, 760 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 47.08ms SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 746 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 928.74ms IncrementalHoareTripleChecker+Time [2021-11-12 22:55:53,258 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3820 Valid, 6992 Invalid, 760 Unknown, 0 Unchecked, 47.08ms Time], IncrementalHoareTripleChecker [14 Valid, 746 Invalid, 0 Unknown, 0 Unchecked, 928.74ms Time] [2021-11-12 22:55:53,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2028 states. [2021-11-12 22:55:53,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2028 to 2027. [2021-11-12 22:55:53,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2027 states, 1961 states have (on average 1.9163691993880674) internal successors, (3758), 1965 states have internal predecessors, (3758), 52 states have call successors, (52), 13 states have call predecessors, (52), 12 states have return successors, (50), 49 states have call predecessors, (50), 50 states have call successors, (50) [2021-11-12 22:55:53,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2027 states to 2027 states and 3860 transitions. [2021-11-12 22:55:53,401 INFO L78 Accepts]: Start accepts. Automaton has 2027 states and 3860 transitions. Word has length 71 [2021-11-12 22:55:53,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:55:53,402 INFO L470 AbstractCegarLoop]: Abstraction has 2027 states and 3860 transitions. [2021-11-12 22:55:53,402 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 15.0) internal successors, (60), 4 states have internal predecessors, (60), 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 22:55:53,402 INFO L276 IsEmpty]: Start isEmpty. Operand 2027 states and 3860 transitions. [2021-11-12 22:55:53,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-12 22:55:53,422 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:55:53,423 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, 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] [2021-11-12 22:55:53,423 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-12 22:55:53,424 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:55:53,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:55:53,428 INFO L85 PathProgramCache]: Analyzing trace with hash 940842131, now seen corresponding path program 1 times [2021-11-12 22:55:53,428 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:55:53,428 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [925654012] [2021-11-12 22:55:53,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:55:53,429 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:55:53,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:55:53,727 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 22:55:53,729 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:55:53,730 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [925654012] [2021-11-12 22:55:53,730 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [925654012] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:55:53,731 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [885627562] [2021-11-12 22:55:53,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:55:53,732 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:55:53,732 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:55:53,741 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:55:53,761 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-12 22:55:54,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:55:54,009 INFO L263 TraceCheckSpWp]: Trace formula consists of 1129 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 22:55:54,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:55:54,358 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-12 22:55:54,358 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:55:54,677 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-12 22:55:54,684 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [885627562] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 22:55:54,687 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:55:54,687 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-12 22:55:54,689 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2059546019] [2021-11-12 22:55:54,689 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:55:54,690 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:55:54,691 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:55:54,692 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:55:54,692 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 22:55:54,692 INFO L87 Difference]: Start difference. First operand 2027 states and 3860 transitions. Second operand has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 2 states have internal predecessors, (107), 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 22:55:55,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:55:55,189 INFO L93 Difference]: Finished difference Result 2782 states and 5049 transitions. [2021-11-12 22:55:55,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:55:55,190 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 2 states have internal predecessors, (107), 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 144 [2021-11-12 22:55:55,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:55:55,210 INFO L225 Difference]: With dead ends: 2782 [2021-11-12 22:55:55,210 INFO L226 Difference]: Without dead ends: 2401 [2021-11-12 22:55:55,213 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 291 GetRequests, 285 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 22:55:55,215 INFO L933 BasicCegarLoop]: 3374 mSDtfsCounter, 3533 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 325 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 311.92ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3533 SdHoareTripleChecker+Valid, 3621 SdHoareTripleChecker+Invalid, 327 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 13.93ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 325 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 382.41ms IncrementalHoareTripleChecker+Time [2021-11-12 22:55:55,215 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3533 Valid, 3621 Invalid, 327 Unknown, 0 Unchecked, 13.93ms Time], IncrementalHoareTripleChecker [2 Valid, 325 Invalid, 0 Unknown, 0 Unchecked, 382.41ms Time] [2021-11-12 22:55:55,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2401 states. [2021-11-12 22:55:55,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2401 to 2395. [2021-11-12 22:55:55,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2395 states, 2273 states have (on average 1.86229652441707) internal successors, (4233), 2278 states have internal predecessors, (4233), 96 states have call successors, (96), 25 states have call predecessors, (96), 24 states have return successors, (94), 92 states have call predecessors, (94), 94 states have call successors, (94) [2021-11-12 22:55:55,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2395 states to 2395 states and 4423 transitions. [2021-11-12 22:55:55,315 INFO L78 Accepts]: Start accepts. Automaton has 2395 states and 4423 transitions. Word has length 144 [2021-11-12 22:55:55,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:55:55,316 INFO L470 AbstractCegarLoop]: Abstraction has 2395 states and 4423 transitions. [2021-11-12 22:55:55,316 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 2 states have internal predecessors, (107), 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 22:55:55,316 INFO L276 IsEmpty]: Start isEmpty. Operand 2395 states and 4423 transitions. [2021-11-12 22:55:55,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-12 22:55:55,323 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:55:55,323 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, 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] [2021-11-12 22:55:55,366 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-12 22:55:55,545 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:55:55,546 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:55:55,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:55:55,546 INFO L85 PathProgramCache]: Analyzing trace with hash -45840175, now seen corresponding path program 1 times [2021-11-12 22:55:55,547 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:55:55,547 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1870186873] [2021-11-12 22:55:55,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:55:55,547 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:55:55,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:55:55,676 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 22:55:55,676 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:55:55,677 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1870186873] [2021-11-12 22:55:55,679 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1870186873] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:55:55,682 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1274752839] [2021-11-12 22:55:55,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:55:55,683 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:55:55,683 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:55:55,684 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:55:55,705 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-12 22:55:55,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:55:55,955 INFO L263 TraceCheckSpWp]: Trace formula consists of 1123 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 22:55:55,962 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:55:56,195 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-12 22:55:56,195 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:55:56,457 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-12 22:55:56,458 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1274752839] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 22:55:56,458 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:55:56,458 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-12 22:55:56,458 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1349554528] [2021-11-12 22:55:56,459 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:55:56,461 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:55:56,461 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:55:56,462 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:55:56,462 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 22:55:56,463 INFO L87 Difference]: Start difference. First operand 2395 states and 4423 transitions. Second operand has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 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 22:55:56,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:55:56,993 INFO L93 Difference]: Finished difference Result 3880 states and 6758 transitions. [2021-11-12 22:55:56,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:55:56,994 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 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 144 [2021-11-12 22:55:56,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:55:57,017 INFO L225 Difference]: With dead ends: 3880 [2021-11-12 22:55:57,017 INFO L226 Difference]: Without dead ends: 3131 [2021-11-12 22:55:57,022 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 291 GetRequests, 285 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 22:55:57,023 INFO L933 BasicCegarLoop]: 3373 mSDtfsCounter, 3545 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 325 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 328.26ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3545 SdHoareTripleChecker+Valid, 3620 SdHoareTripleChecker+Invalid, 327 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 12.98ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 325 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 397.18ms IncrementalHoareTripleChecker+Time [2021-11-12 22:55:57,024 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3545 Valid, 3620 Invalid, 327 Unknown, 0 Unchecked, 12.98ms Time], IncrementalHoareTripleChecker [2 Valid, 325 Invalid, 0 Unknown, 0 Unchecked, 397.18ms Time] [2021-11-12 22:55:57,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3131 states. [2021-11-12 22:55:57,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3131 to 3123. [2021-11-12 22:55:57,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3123 states, 2891 states have (on average 1.7886544448287789) internal successors, (5171), 2898 states have internal predecessors, (5171), 182 states have call successors, (182), 49 states have call predecessors, (182), 48 states have return successors, (180), 176 states have call predecessors, (180), 180 states have call successors, (180) [2021-11-12 22:55:57,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3123 states to 3123 states and 5533 transitions. [2021-11-12 22:55:57,154 INFO L78 Accepts]: Start accepts. Automaton has 3123 states and 5533 transitions. Word has length 144 [2021-11-12 22:55:57,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:55:57,154 INFO L470 AbstractCegarLoop]: Abstraction has 3123 states and 5533 transitions. [2021-11-12 22:55:57,155 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 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 22:55:57,155 INFO L276 IsEmpty]: Start isEmpty. Operand 3123 states and 5533 transitions. [2021-11-12 22:55:57,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-12 22:55:57,161 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:55:57,161 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, 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] [2021-11-12 22:55:57,198 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-12 22:55:57,385 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:55:57,386 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:55:57,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:55:57,386 INFO L85 PathProgramCache]: Analyzing trace with hash -2064742385, now seen corresponding path program 1 times [2021-11-12 22:55:57,387 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:55:57,387 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1197356391] [2021-11-12 22:55:57,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:55:57,387 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:55:57,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:55:57,486 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 22:55:57,487 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:55:57,487 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1197356391] [2021-11-12 22:55:57,487 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1197356391] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:55:57,491 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2087961132] [2021-11-12 22:55:57,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:55:57,492 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:55:57,493 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:55:57,498 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:55:57,509 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-12 22:55:57,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:55:57,757 INFO L263 TraceCheckSpWp]: Trace formula consists of 1117 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 22:55:57,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:55:58,065 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-12 22:55:58,066 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:55:58,399 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 33 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-12 22:55:58,400 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2087961132] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 22:55:58,400 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:55:58,400 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-12 22:55:58,401 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1225395064] [2021-11-12 22:55:58,401 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:55:58,401 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:55:58,402 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:55:58,402 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:55:58,402 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 22:55:58,403 INFO L87 Difference]: Start difference. First operand 3123 states and 5533 transitions. Second operand has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 2 states have internal predecessors, (89), 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 22:55:59,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:55:59,160 INFO L93 Difference]: Finished difference Result 6052 states and 10126 transitions. [2021-11-12 22:55:59,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:55:59,161 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 2 states have internal predecessors, (89), 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 144 [2021-11-12 22:55:59,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:55:59,194 INFO L225 Difference]: With dead ends: 6052 [2021-11-12 22:55:59,194 INFO L226 Difference]: Without dead ends: 4575 [2021-11-12 22:55:59,202 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 291 GetRequests, 285 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 22:55:59,203 INFO L933 BasicCegarLoop]: 3372 mSDtfsCounter, 3551 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 325 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 402.93ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3551 SdHoareTripleChecker+Valid, 3619 SdHoareTripleChecker+Invalid, 327 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 12.75ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 325 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 480.17ms IncrementalHoareTripleChecker+Time [2021-11-12 22:55:59,203 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3551 Valid, 3619 Invalid, 327 Unknown, 0 Unchecked, 12.75ms Time], IncrementalHoareTripleChecker [2 Valid, 325 Invalid, 0 Unknown, 0 Unchecked, 480.17ms Time] [2021-11-12 22:55:59,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4575 states. [2021-11-12 22:55:59,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4575 to 4563. [2021-11-12 22:55:59,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4563 states, 4115 states have (on average 1.7066828675577157) internal successors, (7023), 4126 states have internal predecessors, (7023), 350 states have call successors, (350), 97 states have call predecessors, (350), 96 states have return successors, (348), 340 states have call predecessors, (348), 348 states have call successors, (348) [2021-11-12 22:55:59,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4563 states to 4563 states and 7721 transitions. [2021-11-12 22:55:59,408 INFO L78 Accepts]: Start accepts. Automaton has 4563 states and 7721 transitions. Word has length 144 [2021-11-12 22:55:59,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:55:59,408 INFO L470 AbstractCegarLoop]: Abstraction has 4563 states and 7721 transitions. [2021-11-12 22:55:59,408 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 2 states have internal predecessors, (89), 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 22:55:59,409 INFO L276 IsEmpty]: Start isEmpty. Operand 4563 states and 7721 transitions. [2021-11-12 22:55:59,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-12 22:55:59,418 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:55:59,418 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, 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] [2021-11-12 22:55:59,464 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-12 22:55:59,643 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:55:59,644 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:55:59,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:55:59,644 INFO L85 PathProgramCache]: Analyzing trace with hash 245342413, now seen corresponding path program 1 times [2021-11-12 22:55:59,645 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:55:59,645 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1950206769] [2021-11-12 22:55:59,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:55:59,645 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:55:59,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:55:59,761 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 22:55:59,761 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:55:59,761 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1950206769] [2021-11-12 22:55:59,761 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1950206769] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:55:59,761 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [161356337] [2021-11-12 22:55:59,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:55:59,762 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:55:59,762 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:55:59,766 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:55:59,788 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-12 22:56:00,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:56:00,020 INFO L263 TraceCheckSpWp]: Trace formula consists of 1111 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 22:56:00,025 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:56:00,311 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 38 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-12 22:56:00,311 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:56:00,623 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-12 22:56:00,623 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [161356337] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 22:56:00,623 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:56:00,624 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-12 22:56:00,624 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1231120407] [2021-11-12 22:56:00,624 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:56:00,625 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:56:00,625 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:56:00,625 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:56:00,625 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 22:56:00,626 INFO L87 Difference]: Start difference. First operand 4563 states and 7721 transitions. Second operand has 3 states, 3 states have (on average 38.666666666666664) internal successors, (116), 2 states have internal predecessors, (116), 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 22:56:01,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:56:01,303 INFO L93 Difference]: Finished difference Result 10348 states and 16762 transitions. [2021-11-12 22:56:01,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:56:01,305 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 38.666666666666664) internal successors, (116), 2 states have internal predecessors, (116), 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 144 [2021-11-12 22:56:01,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:56:01,362 INFO L225 Difference]: With dead ends: 10348 [2021-11-12 22:56:01,362 INFO L226 Difference]: Without dead ends: 7431 [2021-11-12 22:56:01,376 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 291 GetRequests, 285 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 22:56:01,378 INFO L933 BasicCegarLoop]: 3333 mSDtfsCounter, 3524 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 321 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 358.92ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3524 SdHoareTripleChecker+Valid, 3580 SdHoareTripleChecker+Invalid, 323 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 12.62ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 321 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 429.35ms IncrementalHoareTripleChecker+Time [2021-11-12 22:56:01,379 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3524 Valid, 3580 Invalid, 323 Unknown, 0 Unchecked, 12.62ms Time], IncrementalHoareTripleChecker [2 Valid, 321 Invalid, 0 Unknown, 0 Unchecked, 429.35ms Time] [2021-11-12 22:56:01,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7431 states. [2021-11-12 22:56:01,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7431 to 7411. [2021-11-12 22:56:01,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7411 states, 6539 states have (on average 1.6331243309374521) internal successors, (10679), 6558 states have internal predecessors, (10679), 678 states have call successors, (678), 193 states have call predecessors, (678), 192 states have return successors, (676), 660 states have call predecessors, (676), 676 states have call successors, (676) [2021-11-12 22:56:01,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7411 states to 7411 states and 12033 transitions. [2021-11-12 22:56:01,785 INFO L78 Accepts]: Start accepts. Automaton has 7411 states and 12033 transitions. Word has length 144 [2021-11-12 22:56:01,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:56:01,788 INFO L470 AbstractCegarLoop]: Abstraction has 7411 states and 12033 transitions. [2021-11-12 22:56:01,790 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 38.666666666666664) internal successors, (116), 2 states have internal predecessors, (116), 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 22:56:01,790 INFO L276 IsEmpty]: Start isEmpty. Operand 7411 states and 12033 transitions. [2021-11-12 22:56:01,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-12 22:56:01,808 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:56:01,809 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, 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] [2021-11-12 22:56:01,853 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-12 22:56:02,025 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:56:02,026 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:56:02,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:56:02,026 INFO L85 PathProgramCache]: Analyzing trace with hash -490809649, now seen corresponding path program 1 times [2021-11-12 22:56:02,026 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:56:02,027 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1358655687] [2021-11-12 22:56:02,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:56:02,027 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:56:02,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:56:02,150 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 22:56:02,151 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:56:02,151 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1358655687] [2021-11-12 22:56:02,151 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1358655687] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:56:02,151 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [884908606] [2021-11-12 22:56:02,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:56:02,152 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:56:02,152 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:56:02,153 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:56:02,176 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-12 22:56:02,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:56:02,408 INFO L263 TraceCheckSpWp]: Trace formula consists of 1105 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 22:56:02,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:56:02,710 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-12 22:56:02,710 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:56:03,087 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-12 22:56:03,087 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [884908606] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 22:56:03,087 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:56:03,088 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-12 22:56:03,088 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1659538002] [2021-11-12 22:56:03,088 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:56:03,089 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:56:03,089 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:56:03,090 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:56:03,090 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 22:56:03,090 INFO L87 Difference]: Start difference. First operand 7411 states and 12033 transitions. Second operand has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 2 states have internal predecessors, (86), 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 22:56:04,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:56:04,131 INFO L93 Difference]: Finished difference Result 18844 states and 29834 transitions. [2021-11-12 22:56:04,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:56:04,132 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 2 states have internal predecessors, (86), 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 144 [2021-11-12 22:56:04,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:56:04,226 INFO L225 Difference]: With dead ends: 18844 [2021-11-12 22:56:04,227 INFO L226 Difference]: Without dead ends: 13079 [2021-11-12 22:56:04,257 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 291 GetRequests, 285 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 22:56:04,259 INFO L933 BasicCegarLoop]: 3333 mSDtfsCounter, 3554 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 321 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 535.81ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3554 SdHoareTripleChecker+Valid, 3580 SdHoareTripleChecker+Invalid, 323 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 15.53ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 321 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 604.17ms IncrementalHoareTripleChecker+Time [2021-11-12 22:56:04,259 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3554 Valid, 3580 Invalid, 323 Unknown, 0 Unchecked, 15.53ms Time], IncrementalHoareTripleChecker [2 Valid, 321 Invalid, 0 Unknown, 0 Unchecked, 604.17ms Time] [2021-11-12 22:56:04,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13079 states. [2021-11-12 22:56:04,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13079 to 13043. [2021-11-12 22:56:04,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13043 states, 11339 states have (on average 1.578181497486551) internal successors, (17895), 11374 states have internal predecessors, (17895), 1318 states have call successors, (1318), 385 states have call predecessors, (1318), 384 states have return successors, (1316), 1284 states have call predecessors, (1316), 1316 states have call successors, (1316) [2021-11-12 22:56:05,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13043 states to 13043 states and 20529 transitions. [2021-11-12 22:56:05,004 INFO L78 Accepts]: Start accepts. Automaton has 13043 states and 20529 transitions. Word has length 144 [2021-11-12 22:56:05,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:56:05,005 INFO L470 AbstractCegarLoop]: Abstraction has 13043 states and 20529 transitions. [2021-11-12 22:56:05,005 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 2 states have internal predecessors, (86), 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 22:56:05,005 INFO L276 IsEmpty]: Start isEmpty. Operand 13043 states and 20529 transitions. [2021-11-12 22:56:05,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-12 22:56:05,039 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:56:05,039 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, 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] [2021-11-12 22:56:05,081 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-12 22:56:05,265 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-12 22:56:05,266 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:56:05,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:56:05,267 INFO L85 PathProgramCache]: Analyzing trace with hash 984423761, now seen corresponding path program 1 times [2021-11-12 22:56:05,267 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:56:05,267 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1564888980] [2021-11-12 22:56:05,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:56:05,268 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:56:05,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:56:05,380 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 22:56:05,380 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:56:05,381 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1564888980] [2021-11-12 22:56:05,381 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1564888980] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:56:05,381 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [41343856] [2021-11-12 22:56:05,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:56:05,381 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:56:05,382 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:56:05,383 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:56:05,404 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-12 22:56:05,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:56:05,638 INFO L263 TraceCheckSpWp]: Trace formula consists of 1099 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 22:56:05,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:56:05,898 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-12 22:56:05,898 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:56:06,134 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-12 22:56:06,135 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [41343856] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 22:56:06,135 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:56:06,135 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-12 22:56:06,135 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [600128638] [2021-11-12 22:56:06,136 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:56:06,136 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:56:06,136 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:56:06,137 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:56:06,137 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 22:56:06,137 INFO L87 Difference]: Start difference. First operand 13043 states and 20529 transitions. Second operand has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 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 22:56:07,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:56:07,492 INFO L93 Difference]: Finished difference Result 35644 states and 55578 transitions. [2021-11-12 22:56:07,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:56:07,493 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 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 144 [2021-11-12 22:56:07,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:56:07,592 INFO L225 Difference]: With dead ends: 35644 [2021-11-12 22:56:07,593 INFO L226 Difference]: Without dead ends: 24247 [2021-11-12 22:56:07,639 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 291 GetRequests, 285 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 22:56:07,640 INFO L933 BasicCegarLoop]: 3333 mSDtfsCounter, 3527 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 321 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 342.91ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3527 SdHoareTripleChecker+Valid, 3580 SdHoareTripleChecker+Invalid, 323 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 12.86ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 321 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 408.87ms IncrementalHoareTripleChecker+Time [2021-11-12 22:56:07,640 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3527 Valid, 3580 Invalid, 323 Unknown, 0 Unchecked, 12.86ms Time], IncrementalHoareTripleChecker [2 Valid, 321 Invalid, 0 Unknown, 0 Unchecked, 408.87ms Time] [2021-11-12 22:56:07,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24247 states. [2021-11-12 22:56:08,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24247 to 24179. [2021-11-12 22:56:08,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24179 states, 20843 states have (on average 1.5417646212157559) internal successors, (32135), 20910 states have internal predecessors, (32135), 2566 states have call successors, (2566), 769 states have call predecessors, (2566), 768 states have return successors, (2564), 2500 states have call predecessors, (2564), 2564 states have call successors, (2564) [2021-11-12 22:56:08,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24179 states to 24179 states and 37265 transitions. [2021-11-12 22:56:08,832 INFO L78 Accepts]: Start accepts. Automaton has 24179 states and 37265 transitions. Word has length 144 [2021-11-12 22:56:08,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:56:08,833 INFO L470 AbstractCegarLoop]: Abstraction has 24179 states and 37265 transitions. [2021-11-12 22:56:08,833 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 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 22:56:08,833 INFO L276 IsEmpty]: Start isEmpty. Operand 24179 states and 37265 transitions. [2021-11-12 22:56:08,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-12 22:56:08,885 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:56:08,885 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, 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] [2021-11-12 22:56:08,921 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-12 22:56:09,101 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:56:09,102 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:56:09,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:56:09,102 INFO L85 PathProgramCache]: Analyzing trace with hash 381358095, now seen corresponding path program 1 times [2021-11-12 22:56:09,103 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:56:09,103 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1276029313] [2021-11-12 22:56:09,103 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:56:09,103 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:56:09,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:56:09,229 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-12 22:56:09,229 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:56:09,230 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1276029313] [2021-11-12 22:56:09,230 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1276029313] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 22:56:09,230 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [257126857] [2021-11-12 22:56:09,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:56:09,231 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:56:09,231 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 22:56:09,232 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 22:56:09,238 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-12 22:56:09,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:56:09,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 1093 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 22:56:09,527 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 22:56:09,809 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-12 22:56:09,809 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 22:56:10,084 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-12 22:56:10,084 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [257126857] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 22:56:10,084 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 22:56:10,084 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-12 22:56:10,085 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [354058104] [2021-11-12 22:56:10,085 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:56:10,085 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 22:56:10,085 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:56:10,085 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 22:56:10,085 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 22:56:10,086 INFO L87 Difference]: Start difference. First operand 24179 states and 37265 transitions. Second operand has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 2 states have internal predecessors, (101), 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 22:56:11,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:56:11,744 INFO L93 Difference]: Finished difference Result 68860 states and 106266 transitions. [2021-11-12 22:56:11,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 22:56:11,745 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 2 states have internal predecessors, (101), 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 144 [2021-11-12 22:56:11,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:56:11,956 INFO L225 Difference]: With dead ends: 68860 [2021-11-12 22:56:11,956 INFO L226 Difference]: Without dead ends: 46327 [2021-11-12 22:56:12,045 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 291 GetRequests, 285 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 22:56:12,046 INFO L933 BasicCegarLoop]: 3333 mSDtfsCounter, 3539 mSDsluCounter, 294 mSDsCounter, 0 mSdLazyCounter, 321 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 315.48ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 3539 SdHoareTripleChecker+Valid, 3580 SdHoareTripleChecker+Invalid, 323 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 10.89ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 321 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 401.12ms IncrementalHoareTripleChecker+Time [2021-11-12 22:56:12,047 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3539 Valid, 3580 Invalid, 323 Unknown, 0 Unchecked, 10.89ms Time], IncrementalHoareTripleChecker [2 Valid, 321 Invalid, 0 Unknown, 0 Unchecked, 401.12ms Time] [2021-11-12 22:56:12,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46327 states. [2021-11-12 22:56:13,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46327 to 46195. [2021-11-12 22:56:13,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46195 states, 39659 states have (on average 1.5187221059532514) internal successors, (60231), 39790 states have internal predecessors, (60231), 4998 states have call successors, (4998), 1537 states have call predecessors, (4998), 1536 states have return successors, (4996), 4868 states have call predecessors, (4996), 4996 states have call successors, (4996) [2021-11-12 22:56:14,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46195 states to 46195 states and 70225 transitions. [2021-11-12 22:56:14,108 INFO L78 Accepts]: Start accepts. Automaton has 46195 states and 70225 transitions. Word has length 144 [2021-11-12 22:56:14,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:56:14,108 INFO L470 AbstractCegarLoop]: Abstraction has 46195 states and 70225 transitions. [2021-11-12 22:56:14,108 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 2 states have internal predecessors, (101), 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 22:56:14,109 INFO L276 IsEmpty]: Start isEmpty. Operand 46195 states and 70225 transitions. [2021-11-12 22:56:14,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-12 22:56:14,195 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:56:14,195 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, 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] [2021-11-12 22:56:14,234 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-12 22:56:14,409 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5a5b84c4-a8fd-414c-83de-bae1876d2a32/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 22:56:14,410 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:56:14,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:56:14,410 INFO L85 PathProgramCache]: Analyzing trace with hash 682415565, now seen corresponding path program 1 times [2021-11-12 22:56:14,410 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:56:14,410 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1646080843] [2021-11-12 22:56:14,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:56:14,411 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:56:14,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:56:14,578 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-12 22:56:14,578 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:56:14,578 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1646080843] [2021-11-12 22:56:14,579 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1646080843] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 22:56:14,579 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:56:14,579 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-12 22:56:14,581 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1584136053] [2021-11-12 22:56:14,581 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:56:14,582 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 22:56:14,582 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:56:14,583 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 22:56:14,583 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-12 22:56:14,584 INFO L87 Difference]: Start difference. First operand 46195 states and 70225 transitions. Second operand has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 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 22:56:19,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:56:19,087 INFO L93 Difference]: Finished difference Result 158075 states and 238040 transitions. [2021-11-12 22:56:19,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-12 22:56:19,087 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 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 144 [2021-11-12 22:56:19,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:56:20,210 INFO L225 Difference]: With dead ends: 158075 [2021-11-12 22:56:20,210 INFO L226 Difference]: Without dead ends: 113527 [2021-11-12 22:56:20,330 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-12 22:56:20,333 INFO L933 BasicCegarLoop]: 3343 mSDtfsCounter, 4497 mSDsluCounter, 7143 mSDsCounter, 0 mSdLazyCounter, 961 mSolverCounterSat, 156 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 699.22ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 4519 SdHoareTripleChecker+Valid, 9958 SdHoareTripleChecker+Invalid, 1117 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 35.17ms SdHoareTripleChecker+Time, 156 IncrementalHoareTripleChecker+Valid, 961 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 876.82ms IncrementalHoareTripleChecker+Time [2021-11-12 22:56:20,334 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4519 Valid, 9958 Invalid, 1117 Unknown, 0 Unchecked, 35.17ms Time], IncrementalHoareTripleChecker [156 Valid, 961 Invalid, 0 Unknown, 0 Unchecked, 876.82ms Time] [2021-11-12 22:56:20,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113527 states. [2021-11-12 22:56:23,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113527 to 89203. [2021-11-12 22:56:24,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89203 states, 76395 states have (on average 1.5038549643301262) internal successors, (114887), 76654 states have internal predecessors, (114887), 9734 states have call successors, (9734), 3073 states have call predecessors, (9734), 3072 states have return successors, (9732), 9476 states have call predecessors, (9732), 9732 states have call successors, (9732) [2021-11-12 22:56:24,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89203 states to 89203 states and 134353 transitions. [2021-11-12 22:56:24,420 INFO L78 Accepts]: Start accepts. Automaton has 89203 states and 134353 transitions. Word has length 144 [2021-11-12 22:56:24,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:56:24,422 INFO L470 AbstractCegarLoop]: Abstraction has 89203 states and 134353 transitions. [2021-11-12 22:56:24,422 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 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 22:56:24,422 INFO L276 IsEmpty]: Start isEmpty. Operand 89203 states and 134353 transitions. [2021-11-12 22:56:24,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-12 22:56:24,545 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:56:24,545 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, 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 22:56:24,546 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-12 22:56:24,546 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:56:24,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:56:24,546 INFO L85 PathProgramCache]: Analyzing trace with hash 1589407828, now seen corresponding path program 1 times [2021-11-12 22:56:24,547 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:56:24,547 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1063258152] [2021-11-12 22:56:24,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:56:24,547 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:56:24,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:56:24,712 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-12 22:56:24,712 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:56:24,712 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1063258152] [2021-11-12 22:56:24,712 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1063258152] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 22:56:24,713 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:56:24,713 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-12 22:56:24,713 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2118508656] [2021-11-12 22:56:24,713 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:56:24,714 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 22:56:24,714 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:56:24,714 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 22:56:24,715 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-12 22:56:24,715 INFO L87 Difference]: Start difference. First operand 89203 states and 134353 transitions. Second operand has 6 states, 6 states have (on average 14.0) internal successors, (84), 6 states have internal predecessors, (84), 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 22:56:31,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 22:56:31,057 INFO L93 Difference]: Finished difference Result 242043 states and 363607 transitions. [2021-11-12 22:56:31,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-12 22:56:31,062 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 14.0) internal successors, (84), 6 states have internal predecessors, (84), 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 145 [2021-11-12 22:56:31,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 22:56:31,889 INFO L225 Difference]: With dead ends: 242043 [2021-11-12 22:56:31,889 INFO L226 Difference]: Without dead ends: 154487 [2021-11-12 22:56:32,081 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-12 22:56:32,081 INFO L933 BasicCegarLoop]: 3328 mSDtfsCounter, 4357 mSDsluCounter, 7209 mSDsCounter, 0 mSdLazyCounter, 958 mSolverCounterSat, 168 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 684.39ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 4363 SdHoareTripleChecker+Valid, 10003 SdHoareTripleChecker+Invalid, 1126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 25.14ms SdHoareTripleChecker+Time, 168 IncrementalHoareTripleChecker+Valid, 958 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 882.25ms IncrementalHoareTripleChecker+Time [2021-11-12 22:56:32,082 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4363 Valid, 10003 Invalid, 1126 Unknown, 0 Unchecked, 25.14ms Time], IncrementalHoareTripleChecker [168 Valid, 958 Invalid, 0 Unknown, 0 Unchecked, 882.25ms Time] [2021-11-12 22:56:32,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154487 states. [2021-11-12 22:56:37,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154487 to 131955. [2021-11-12 22:56:37,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131955 states, 112875 states have (on average 1.4963720930232558) internal successors, (168903), 113262 states have internal predecessors, (168903), 14470 states have call successors, (14470), 4609 states have call predecessors, (14470), 4608 states have return successors, (14468), 14084 states have call predecessors, (14468), 14468 states have call successors, (14468) [2021-11-12 22:56:38,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131955 states to 131955 states and 197841 transitions. [2021-11-12 22:56:38,235 INFO L78 Accepts]: Start accepts. Automaton has 131955 states and 197841 transitions. Word has length 145 [2021-11-12 22:56:38,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 22:56:38,235 INFO L470 AbstractCegarLoop]: Abstraction has 131955 states and 197841 transitions. [2021-11-12 22:56:38,236 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 14.0) internal successors, (84), 6 states have internal predecessors, (84), 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 22:56:38,236 INFO L276 IsEmpty]: Start isEmpty. Operand 131955 states and 197841 transitions. [2021-11-12 22:56:38,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-12 22:56:38,455 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 22:56:38,455 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, 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, 1] [2021-11-12 22:56:38,456 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-12 22:56:38,456 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 22:56:38,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 22:56:38,457 INFO L85 PathProgramCache]: Analyzing trace with hash -318176727, now seen corresponding path program 1 times [2021-11-12 22:56:38,457 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 22:56:38,457 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [470386184] [2021-11-12 22:56:38,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 22:56:38,458 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 22:56:38,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 22:56:38,623 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-12 22:56:38,623 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 22:56:38,624 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [470386184] [2021-11-12 22:56:38,624 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [470386184] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 22:56:38,624 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 22:56:38,624 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-12 22:56:38,624 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2034369615] [2021-11-12 22:56:38,625 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 22:56:38,626 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 22:56:38,626 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 22:56:38,627 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 22:56:38,627 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-12 22:56:38,627 INFO L87 Difference]: Start difference. First operand 131955 states and 197841 transitions. Second operand has 6 states, 6 states have (on average 14.166666666666666) internal successors, (85), 6 states have internal predecessors, (85), 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)