./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/elevator_spec9_product28.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/elevator_spec9_product28.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P --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 339ae17141354782861ad14ce1f1515b53735bca35311ebbaf6a68a6022f4172 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 00:31:51,522 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 00:31:51,524 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 00:31:51,581 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 00:31:51,581 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 00:31:51,585 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 00:31:51,587 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 00:31:51,592 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 00:31:51,594 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 00:31:51,601 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 00:31:51,603 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 00:31:51,604 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 00:31:51,605 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 00:31:51,608 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 00:31:51,611 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 00:31:51,617 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 00:31:51,619 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 00:31:51,619 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 00:31:51,622 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 00:31:51,632 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 00:31:51,634 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 00:31:51,635 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 00:31:51,638 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 00:31:51,639 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 00:31:51,648 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 00:31:51,649 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 00:31:51,649 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 00:31:51,652 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 00:31:51,652 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 00:31:51,654 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 00:31:51,654 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 00:31:51,655 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 00:31:51,657 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 00:31:51,658 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 00:31:51,660 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 00:31:51,660 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 00:31:51,661 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 00:31:51,661 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 00:31:51,661 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 00:31:51,662 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 00:31:51,663 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 00:31:51,664 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 00:31:51,708 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 00:31:51,711 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 00:31:51,712 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 00:31:51,712 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 00:31:51,713 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 00:31:51,713 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 00:31:51,713 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 00:31:51,713 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 00:31:51,714 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 00:31:51,714 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 00:31:51,715 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 00:31:51,715 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 00:31:51,715 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 00:31:51,715 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 00:31:51,716 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 00:31:51,716 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 00:31:51,716 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 00:31:51,716 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 00:31:51,717 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 00:31:51,717 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 00:31:51,718 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 00:31:51,718 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 00:31:51,718 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 00:31:51,718 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 00:31:51,718 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 00:31:51,719 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 00:31:51,720 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 00:31:51,720 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 00:31:51,721 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 00:31:51,721 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 00:31:51,721 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 00:31:51,721 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 00:31:51,722 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:31:51,722 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 00:31:51,722 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 00:31:51,722 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 00:31:51,723 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 00:31:51,723 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 00:31:51,723 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 00:31:51,723 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 00:31:51,723 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 00:31:51,724 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_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 339ae17141354782861ad14ce1f1515b53735bca35311ebbaf6a68a6022f4172 [2021-11-21 00:31:52,010 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 00:31:52,033 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 00:31:52,037 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 00:31:52,039 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 00:31:52,040 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 00:31:52,041 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/product-lines/elevator_spec9_product28.cil.c [2021-11-21 00:31:52,111 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/data/354214de0/af9591df18d34887862a8906394b6089/FLAGe321f1946 [2021-11-21 00:31:52,725 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 00:31:52,726 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/sv-benchmarks/c/product-lines/elevator_spec9_product28.cil.c [2021-11-21 00:31:52,761 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/data/354214de0/af9591df18d34887862a8906394b6089/FLAGe321f1946 [2021-11-21 00:31:52,953 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/data/354214de0/af9591df18d34887862a8906394b6089 [2021-11-21 00:31:52,956 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 00:31:52,957 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 00:31:52,969 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 00:31:52,970 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 00:31:52,977 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 00:31:52,978 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:31:52" (1/1) ... [2021-11-21 00:31:52,978 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@11c335ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:31:52, skipping insertion in model container [2021-11-21 00:31:52,979 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:31:52" (1/1) ... [2021-11-21 00:31:52,986 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 00:31:53,069 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 00:31:53,744 WARN L230 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_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/sv-benchmarks/c/product-lines/elevator_spec9_product28.cil.c[73050,73063] [2021-11-21 00:31:53,747 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:31:53,757 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 00:31:53,865 WARN L230 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_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/sv-benchmarks/c/product-lines/elevator_spec9_product28.cil.c[73050,73063] [2021-11-21 00:31:53,866 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:31:53,905 INFO L208 MainTranslator]: Completed translation [2021-11-21 00:31:53,905 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:31:53 WrapperNode [2021-11-21 00:31:53,906 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 00:31:53,907 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 00:31:53,908 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 00:31:53,908 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 00:31:53,915 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:31:53" (1/1) ... [2021-11-21 00:31:53,986 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:31:53" (1/1) ... [2021-11-21 00:31:54,079 INFO L137 Inliner]: procedures = 97, calls = 345, calls flagged for inlining = 27, calls inlined = 23, statements flattened = 1131 [2021-11-21 00:31:54,082 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 00:31:54,083 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 00:31:54,084 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 00:31:54,084 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 00:31:54,093 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:31:53" (1/1) ... [2021-11-21 00:31:54,094 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:31:53" (1/1) ... [2021-11-21 00:31:54,108 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:31:53" (1/1) ... [2021-11-21 00:31:54,113 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:31:53" (1/1) ... [2021-11-21 00:31:54,163 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:31:53" (1/1) ... [2021-11-21 00:31:54,179 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:31:53" (1/1) ... [2021-11-21 00:31:54,184 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:31:53" (1/1) ... [2021-11-21 00:31:54,195 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 00:31:54,196 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 00:31:54,197 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 00:31:54,197 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 00:31:54,198 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:31:53" (1/1) ... [2021-11-21 00:31:54,219 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:31:54,234 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:31:54,251 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 00:31:54,274 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 00:31:54,311 INFO L130 BoogieDeclarations]: Found specification of procedure bigMacCall [2021-11-21 00:31:54,312 INFO L138 BoogieDeclarations]: Found implementation of procedure bigMacCall [2021-11-21 00:31:54,312 INFO L130 BoogieDeclarations]: Found specification of procedure enterElevator [2021-11-21 00:31:54,312 INFO L138 BoogieDeclarations]: Found implementation of procedure enterElevator [2021-11-21 00:31:54,312 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection [2021-11-21 00:31:54,313 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection [2021-11-21 00:31:54,313 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift [2021-11-21 00:31:54,313 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift [2021-11-21 00:31:54,313 INFO L130 BoogieDeclarations]: Found specification of procedure getDestination [2021-11-21 00:31:54,313 INFO L138 BoogieDeclarations]: Found implementation of procedure getDestination [2021-11-21 00:31:54,314 INFO L130 BoogieDeclarations]: Found specification of procedure isBlocked [2021-11-21 00:31:54,314 INFO L138 BoogieDeclarations]: Found implementation of procedure isBlocked [2021-11-21 00:31:54,314 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentFloorID [2021-11-21 00:31:54,314 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentFloorID [2021-11-21 00:31:54,314 INFO L130 BoogieDeclarations]: Found specification of procedure pressInLiftFloorButton [2021-11-21 00:31:54,315 INFO L138 BoogieDeclarations]: Found implementation of procedure pressInLiftFloorButton [2021-11-21 00:31:54,315 INFO L130 BoogieDeclarations]: Found specification of procedure leaveElevator [2021-11-21 00:31:54,315 INFO L138 BoogieDeclarations]: Found implementation of procedure leaveElevator [2021-11-21 00:31:54,315 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 00:31:54,316 INFO L130 BoogieDeclarations]: Found specification of procedure getWeight [2021-11-21 00:31:54,316 INFO L138 BoogieDeclarations]: Found implementation of procedure getWeight [2021-11-21 00:31:54,316 INFO L130 BoogieDeclarations]: Found specification of procedure isExecutiveFloorCalling [2021-11-21 00:31:54,316 INFO L138 BoogieDeclarations]: Found implementation of procedure isExecutiveFloorCalling [2021-11-21 00:31:54,316 INFO L130 BoogieDeclarations]: Found specification of procedure getReverseHeading [2021-11-21 00:31:54,317 INFO L138 BoogieDeclarations]: Found implementation of procedure getReverseHeading [2021-11-21 00:31:54,317 INFO L130 BoogieDeclarations]: Found specification of procedure cleanup [2021-11-21 00:31:54,317 INFO L138 BoogieDeclarations]: Found implementation of procedure cleanup [2021-11-21 00:31:54,317 INFO L130 BoogieDeclarations]: Found specification of procedure areDoorsOpen [2021-11-21 00:31:54,317 INFO L138 BoogieDeclarations]: Found implementation of procedure areDoorsOpen [2021-11-21 00:31:54,318 INFO L130 BoogieDeclarations]: Found specification of procedure __automaton_fail [2021-11-21 00:31:54,318 INFO L138 BoogieDeclarations]: Found implementation of procedure __automaton_fail [2021-11-21 00:31:54,318 INFO L130 BoogieDeclarations]: Found specification of procedure isTopFloor [2021-11-21 00:31:54,318 INFO L138 BoogieDeclarations]: Found implementation of procedure isTopFloor [2021-11-21 00:31:54,319 INFO L130 BoogieDeclarations]: Found specification of procedure resetCallOnFloor [2021-11-21 00:31:54,319 INFO L138 BoogieDeclarations]: Found implementation of procedure resetCallOnFloor [2021-11-21 00:31:54,319 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedAtCurrentFloor__wrappee__empty [2021-11-21 00:31:54,320 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedAtCurrentFloor__wrappee__empty [2021-11-21 00:31:54,320 INFO L130 BoogieDeclarations]: Found specification of procedure initPersonOnFloor [2021-11-21 00:31:54,320 INFO L138 BoogieDeclarations]: Found implementation of procedure initPersonOnFloor [2021-11-21 00:31:54,320 INFO L130 BoogieDeclarations]: Found specification of procedure removePersonFromFloor [2021-11-21 00:31:54,320 INFO L138 BoogieDeclarations]: Found implementation of procedure removePersonFromFloor [2021-11-21 00:31:54,321 INFO L130 BoogieDeclarations]: Found specification of procedure getOrigin [2021-11-21 00:31:54,321 INFO L138 BoogieDeclarations]: Found implementation of procedure getOrigin [2021-11-21 00:31:54,321 INFO L130 BoogieDeclarations]: Found specification of procedure continueInDirection [2021-11-21 00:31:54,322 INFO L138 BoogieDeclarations]: Found implementation of procedure continueInDirection [2021-11-21 00:31:54,322 INFO L130 BoogieDeclarations]: Found specification of procedure isEmpty [2021-11-21 00:31:54,323 INFO L138 BoogieDeclarations]: Found implementation of procedure isEmpty [2021-11-21 00:31:54,324 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 00:31:54,324 INFO L130 BoogieDeclarations]: Found specification of procedure isPersonOnFloor [2021-11-21 00:31:54,325 INFO L138 BoogieDeclarations]: Found implementation of procedure isPersonOnFloor [2021-11-21 00:31:54,325 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 00:31:54,325 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 00:31:54,325 INFO L130 BoogieDeclarations]: Found specification of procedure isFloorCalling [2021-11-21 00:31:54,325 INFO L138 BoogieDeclarations]: Found implementation of procedure isFloorCalling [2021-11-21 00:31:54,326 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift__wrappee__executivefloor [2021-11-21 00:31:54,326 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift__wrappee__executivefloor [2021-11-21 00:31:54,522 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 00:31:54,524 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 00:31:55,671 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 00:31:56,284 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 00:31:56,285 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-21 00:31:56,288 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:31:56 BoogieIcfgContainer [2021-11-21 00:31:56,288 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 00:31:56,291 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 00:31:56,291 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 00:31:56,295 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 00:31:56,296 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 12:31:52" (1/3) ... [2021-11-21 00:31:56,296 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@50db9d7a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:31:56, skipping insertion in model container [2021-11-21 00:31:56,296 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:31:53" (2/3) ... [2021-11-21 00:31:56,297 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@50db9d7a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:31:56, skipping insertion in model container [2021-11-21 00:31:56,297 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:31:56" (3/3) ... [2021-11-21 00:31:56,298 INFO L111 eAbstractionObserver]: Analyzing ICFG elevator_spec9_product28.cil.c [2021-11-21 00:31:56,307 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 00:31:56,308 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 00:31:56,366 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 00:31:56,371 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 [2021-11-21 00:31:56,371 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 00:31:56,437 INFO L276 IsEmpty]: Start isEmpty. Operand has 378 states, 253 states have (on average 1.5849802371541502) internal successors, (401), 276 states have internal predecessors, (401), 97 states have call successors, (97), 26 states have call predecessors, (97), 26 states have return successors, (97), 90 states have call predecessors, (97), 97 states have call successors, (97) [2021-11-21 00:31:56,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-21 00:31:56,446 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:31:56,447 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] [2021-11-21 00:31:56,447 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:31:56,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:31:56,453 INFO L85 PathProgramCache]: Analyzing trace with hash 348250290, now seen corresponding path program 1 times [2021-11-21 00:31:56,463 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:31:56,463 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1585269401] [2021-11-21 00:31:56,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:31:56,464 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:31:56,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:31:56,955 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:31:56,969 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:31:56,970 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1585269401] [2021-11-21 00:31:56,971 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1585269401] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:31:56,971 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:31:56,971 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 00:31:56,973 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [677210026] [2021-11-21 00:31:56,974 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:31:56,978 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-21 00:31:56,979 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:31:57,017 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-21 00:31:57,019 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-21 00:31:57,025 INFO L87 Difference]: Start difference. First operand has 378 states, 253 states have (on average 1.5849802371541502) internal successors, (401), 276 states have internal predecessors, (401), 97 states have call successors, (97), 26 states have call predecessors, (97), 26 states have return successors, (97), 90 states have call predecessors, (97), 97 states have call successors, (97) Second operand has 2 states, 2 states have (on average 13.0) internal successors, (26), 2 states have internal predecessors, (26), 2 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 1 states have call successors, (8) [2021-11-21 00:31:57,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:31:57,263 INFO L93 Difference]: Finished difference Result 396 states and 622 transitions. [2021-11-21 00:31:57,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-21 00:31:57,266 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 13.0) internal successors, (26), 2 states have internal predecessors, (26), 2 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 1 states have call successors, (8) Word has length 43 [2021-11-21 00:31:57,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:31:57,294 INFO L225 Difference]: With dead ends: 396 [2021-11-21 00:31:57,298 INFO L226 Difference]: Without dead ends: 374 [2021-11-21 00:31:57,306 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-21 00:31:57,314 INFO L933 BasicCegarLoop]: 550 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 550 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:31:57,316 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 550 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:31:57,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 374 states. [2021-11-21 00:31:57,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 374 to 374. [2021-11-21 00:31:57,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 374 states, 251 states have (on average 1.5737051792828685) internal successors, (395), 272 states have internal predecessors, (395), 97 states have call successors, (97), 26 states have call predecessors, (97), 25 states have return successors, (92), 89 states have call predecessors, (92), 92 states have call successors, (92) [2021-11-21 00:31:57,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 374 states to 374 states and 584 transitions. [2021-11-21 00:31:57,429 INFO L78 Accepts]: Start accepts. Automaton has 374 states and 584 transitions. Word has length 43 [2021-11-21 00:31:57,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:31:57,431 INFO L470 AbstractCegarLoop]: Abstraction has 374 states and 584 transitions. [2021-11-21 00:31:57,432 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 13.0) internal successors, (26), 2 states have internal predecessors, (26), 2 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 1 states have call successors, (8) [2021-11-21 00:31:57,432 INFO L276 IsEmpty]: Start isEmpty. Operand 374 states and 584 transitions. [2021-11-21 00:31:57,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-21 00:31:57,436 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:31:57,436 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] [2021-11-21 00:31:57,437 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 00:31:57,437 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:31:57,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:31:57,438 INFO L85 PathProgramCache]: Analyzing trace with hash -32838999, now seen corresponding path program 1 times [2021-11-21 00:31:57,438 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:31:57,439 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2131327582] [2021-11-21 00:31:57,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:31:57,439 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:31:57,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:31:57,739 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:31:57,740 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:31:57,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2131327582] [2021-11-21 00:31:57,741 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2131327582] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:31:57,741 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:31:57,741 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-21 00:31:57,742 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1387209683] [2021-11-21 00:31:57,742 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:31:57,744 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:31:57,745 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:31:57,745 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:31:57,746 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:31:57,746 INFO L87 Difference]: Start difference. First operand 374 states and 584 transitions. Second operand has 6 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 6 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-21 00:32:00,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:32:00,113 INFO L93 Difference]: Finished difference Result 1210 states and 1926 transitions. [2021-11-21 00:32:00,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:32:00,114 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 6 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) Word has length 44 [2021-11-21 00:32:00,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:32:00,124 INFO L225 Difference]: With dead ends: 1210 [2021-11-21 00:32:00,124 INFO L226 Difference]: Without dead ends: 852 [2021-11-21 00:32:00,130 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:32:00,132 INFO L933 BasicCegarLoop]: 561 mSDtfsCounter, 1914 mSDsluCounter, 520 mSDsCounter, 0 mSdLazyCounter, 1189 mSolverCounterSat, 774 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1979 SdHoareTripleChecker+Valid, 1054 SdHoareTripleChecker+Invalid, 1963 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 774 IncrementalHoareTripleChecker+Valid, 1189 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:32:00,133 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1979 Valid, 1054 Invalid, 1963 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [774 Valid, 1189 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2021-11-21 00:32:00,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 852 states. [2021-11-21 00:32:00,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 852 to 755. [2021-11-21 00:32:00,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 755 states, 526 states have (on average 1.5893536121673004) internal successors, (836), 556 states have internal predecessors, (836), 181 states have call successors, (181), 46 states have call predecessors, (181), 47 states have return successors, (183), 165 states have call predecessors, (183), 176 states have call successors, (183) [2021-11-21 00:32:00,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 755 states to 755 states and 1200 transitions. [2021-11-21 00:32:00,258 INFO L78 Accepts]: Start accepts. Automaton has 755 states and 1200 transitions. Word has length 44 [2021-11-21 00:32:00,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:32:00,259 INFO L470 AbstractCegarLoop]: Abstraction has 755 states and 1200 transitions. [2021-11-21 00:32:00,260 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 6 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-21 00:32:00,260 INFO L276 IsEmpty]: Start isEmpty. Operand 755 states and 1200 transitions. [2021-11-21 00:32:00,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-11-21 00:32:00,277 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:32:00,278 INFO L514 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:32:00,278 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-21 00:32:00,279 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:32:00,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:32:00,280 INFO L85 PathProgramCache]: Analyzing trace with hash 1611720763, now seen corresponding path program 1 times [2021-11-21 00:32:00,280 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:32:00,280 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1935922160] [2021-11-21 00:32:00,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:32:00,281 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:32:00,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:32:00,549 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 00:32:00,550 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:32:00,550 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1935922160] [2021-11-21 00:32:00,550 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1935922160] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:32:00,551 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:32:00,553 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-21 00:32:00,553 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1836042259] [2021-11-21 00:32:00,553 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:32:00,554 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 00:32:00,554 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:32:00,555 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 00:32:00,555 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:32:00,556 INFO L87 Difference]: Start difference. First operand 755 states and 1200 transitions. Second operand has 7 states, 7 states have (on average 6.857142857142857) internal successors, (48), 7 states have internal predecessors, (48), 5 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 5 states have call predecessors, (16), 4 states have call successors, (16) [2021-11-21 00:32:02,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:32:02,928 INFO L93 Difference]: Finished difference Result 2329 states and 3742 transitions. [2021-11-21 00:32:02,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-21 00:32:02,929 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 6.857142857142857) internal successors, (48), 7 states have internal predecessors, (48), 5 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 5 states have call predecessors, (16), 4 states have call successors, (16) Word has length 88 [2021-11-21 00:32:02,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:32:02,944 INFO L225 Difference]: With dead ends: 2329 [2021-11-21 00:32:02,945 INFO L226 Difference]: Without dead ends: 1591 [2021-11-21 00:32:02,951 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2021-11-21 00:32:02,953 INFO L933 BasicCegarLoop]: 579 mSDtfsCounter, 1110 mSDsluCounter, 1239 mSDsCounter, 0 mSdLazyCounter, 2222 mSolverCounterSat, 449 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1181 SdHoareTripleChecker+Valid, 1743 SdHoareTripleChecker+Invalid, 2671 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 449 IncrementalHoareTripleChecker+Valid, 2222 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:32:02,953 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1181 Valid, 1743 Invalid, 2671 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [449 Valid, 2222 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2021-11-21 00:32:02,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1591 states. [2021-11-21 00:32:03,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1591 to 1522. [2021-11-21 00:32:03,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1522 states, 1071 states have (on average 1.5938375350140057) internal successors, (1707), 1127 states have internal predecessors, (1707), 354 states have call successors, (354), 89 states have call predecessors, (354), 96 states have return successors, (381), 329 states have call predecessors, (381), 349 states have call successors, (381) [2021-11-21 00:32:03,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1522 states to 1522 states and 2442 transitions. [2021-11-21 00:32:03,104 INFO L78 Accepts]: Start accepts. Automaton has 1522 states and 2442 transitions. Word has length 88 [2021-11-21 00:32:03,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:32:03,105 INFO L470 AbstractCegarLoop]: Abstraction has 1522 states and 2442 transitions. [2021-11-21 00:32:03,106 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 6.857142857142857) internal successors, (48), 7 states have internal predecessors, (48), 5 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 5 states have call predecessors, (16), 4 states have call successors, (16) [2021-11-21 00:32:03,106 INFO L276 IsEmpty]: Start isEmpty. Operand 1522 states and 2442 transitions. [2021-11-21 00:32:03,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-11-21 00:32:03,110 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:32:03,111 INFO L514 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:32:03,111 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-21 00:32:03,111 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:32:03,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:32:03,112 INFO L85 PathProgramCache]: Analyzing trace with hash -646781416, now seen corresponding path program 1 times [2021-11-21 00:32:03,112 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:32:03,113 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1377328203] [2021-11-21 00:32:03,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:32:03,113 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:32:03,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:32:03,233 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 00:32:03,233 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:32:03,233 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1377328203] [2021-11-21 00:32:03,234 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1377328203] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:32:03,234 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:32:03,234 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:32:03,234 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [388311406] [2021-11-21 00:32:03,235 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:32:03,235 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:32:03,236 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:32:03,236 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:32:03,236 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:32:03,237 INFO L87 Difference]: Start difference. First operand 1522 states and 2442 transitions. Second operand has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-21 00:32:03,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:32:03,520 INFO L93 Difference]: Finished difference Result 3871 states and 6247 transitions. [2021-11-21 00:32:03,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:32:03,526 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) Word has length 92 [2021-11-21 00:32:03,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:32:03,550 INFO L225 Difference]: With dead ends: 3871 [2021-11-21 00:32:03,550 INFO L226 Difference]: Without dead ends: 2365 [2021-11-21 00:32:03,561 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:32:03,562 INFO L933 BasicCegarLoop]: 667 mSDtfsCounter, 548 mSDsluCounter, 560 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 548 SdHoareTripleChecker+Valid, 1196 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:32:03,563 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [548 Valid, 1196 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:32:03,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2365 states. [2021-11-21 00:32:03,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2365 to 2337. [2021-11-21 00:32:03,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2337 states, 1649 states have (on average 1.5894481503941782) internal successors, (2621), 1738 states have internal predecessors, (2621), 539 states have call successors, (539), 134 states have call predecessors, (539), 148 states have return successors, (601), 499 states have call predecessors, (601), 534 states have call successors, (601) [2021-11-21 00:32:03,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2337 states to 2337 states and 3761 transitions. [2021-11-21 00:32:03,794 INFO L78 Accepts]: Start accepts. Automaton has 2337 states and 3761 transitions. Word has length 92 [2021-11-21 00:32:03,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:32:03,795 INFO L470 AbstractCegarLoop]: Abstraction has 2337 states and 3761 transitions. [2021-11-21 00:32:03,795 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-21 00:32:03,796 INFO L276 IsEmpty]: Start isEmpty. Operand 2337 states and 3761 transitions. [2021-11-21 00:32:03,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-11-21 00:32:03,800 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:32:03,800 INFO L514 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:32:03,800 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-21 00:32:03,801 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:32:03,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:32:03,801 INFO L85 PathProgramCache]: Analyzing trace with hash 1424335357, now seen corresponding path program 1 times [2021-11-21 00:32:03,801 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:32:03,802 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1143021724] [2021-11-21 00:32:03,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:32:03,802 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:32:03,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:32:03,902 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 00:32:03,903 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:32:03,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1143021724] [2021-11-21 00:32:03,903 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1143021724] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:32:03,903 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:32:03,903 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:32:03,903 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1979299732] [2021-11-21 00:32:03,904 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:32:03,904 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:32:03,904 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:32:03,905 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:32:03,905 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:32:03,905 INFO L87 Difference]: Start difference. First operand 2337 states and 3761 transitions. Second operand has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-21 00:32:04,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:32:04,249 INFO L93 Difference]: Finished difference Result 6317 states and 10232 transitions. [2021-11-21 00:32:04,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:32:04,250 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) Word has length 93 [2021-11-21 00:32:04,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:32:04,327 INFO L225 Difference]: With dead ends: 6317 [2021-11-21 00:32:04,328 INFO L226 Difference]: Without dead ends: 3997 [2021-11-21 00:32:04,354 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:32:04,355 INFO L933 BasicCegarLoop]: 670 mSDtfsCounter, 547 mSDsluCounter, 563 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 547 SdHoareTripleChecker+Valid, 1202 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:32:04,355 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [547 Valid, 1202 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:32:04,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3997 states. [2021-11-21 00:32:04,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3997 to 3968. [2021-11-21 00:32:04,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3968 states, 2806 states have (on average 1.5855310049893085) internal successors, (4449), 2961 states have internal predecessors, (4449), 909 states have call successors, (909), 224 states have call predecessors, (909), 252 states have return successors, (1053), 839 states have call predecessors, (1053), 904 states have call successors, (1053) [2021-11-21 00:32:04,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3968 states to 3968 states and 6411 transitions. [2021-11-21 00:32:04,642 INFO L78 Accepts]: Start accepts. Automaton has 3968 states and 6411 transitions. Word has length 93 [2021-11-21 00:32:04,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:32:04,643 INFO L470 AbstractCegarLoop]: Abstraction has 3968 states and 6411 transitions. [2021-11-21 00:32:04,643 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-21 00:32:04,643 INFO L276 IsEmpty]: Start isEmpty. Operand 3968 states and 6411 transitions. [2021-11-21 00:32:04,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-21 00:32:04,647 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:32:04,647 INFO L514 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:32:04,647 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-21 00:32:04,647 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:32:04,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:32:04,648 INFO L85 PathProgramCache]: Analyzing trace with hash 1204449786, now seen corresponding path program 1 times [2021-11-21 00:32:04,648 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:32:04,648 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1913718154] [2021-11-21 00:32:04,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:32:04,649 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:32:04,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:32:04,740 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 00:32:04,740 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:32:04,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1913718154] [2021-11-21 00:32:04,740 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1913718154] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:32:04,741 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:32:04,741 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:32:04,741 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1165362515] [2021-11-21 00:32:04,741 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:32:04,742 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:32:04,742 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:32:04,742 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:32:04,742 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:32:04,743 INFO L87 Difference]: Start difference. First operand 3968 states and 6411 transitions. Second operand has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-21 00:32:05,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:32:05,256 INFO L93 Difference]: Finished difference Result 11210 states and 18292 transitions. [2021-11-21 00:32:05,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:32:05,257 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) Word has length 94 [2021-11-21 00:32:05,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:32:05,330 INFO L225 Difference]: With dead ends: 11210 [2021-11-21 00:32:05,330 INFO L226 Difference]: Without dead ends: 7261 [2021-11-21 00:32:05,362 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:32:05,364 INFO L933 BasicCegarLoop]: 673 mSDtfsCounter, 546 mSDsluCounter, 566 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 546 SdHoareTripleChecker+Valid, 1208 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:32:05,365 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [546 Valid, 1208 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:32:05,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7261 states. [2021-11-21 00:32:05,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7261 to 7231. [2021-11-21 00:32:05,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7231 states, 5121 states have (on average 1.5817223198594024) internal successors, (8100), 5408 states have internal predecessors, (8100), 1649 states have call successors, (1649), 404 states have call predecessors, (1649), 460 states have return successors, (2029), 1519 states have call predecessors, (2029), 1644 states have call successors, (2029) [2021-11-21 00:32:05,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7231 states to 7231 states and 11778 transitions. [2021-11-21 00:32:05,988 INFO L78 Accepts]: Start accepts. Automaton has 7231 states and 11778 transitions. Word has length 94 [2021-11-21 00:32:05,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:32:05,989 INFO L470 AbstractCegarLoop]: Abstraction has 7231 states and 11778 transitions. [2021-11-21 00:32:05,989 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-21 00:32:05,989 INFO L276 IsEmpty]: Start isEmpty. Operand 7231 states and 11778 transitions. [2021-11-21 00:32:05,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-21 00:32:05,994 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:32:05,995 INFO L514 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:32:05,995 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-21 00:32:05,995 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:32:05,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:32:05,996 INFO L85 PathProgramCache]: Analyzing trace with hash -1317031713, now seen corresponding path program 1 times [2021-11-21 00:32:05,996 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:32:05,996 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1893222665] [2021-11-21 00:32:05,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:32:05,997 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:32:06,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:32:06,108 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 00:32:06,108 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:32:06,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1893222665] [2021-11-21 00:32:06,108 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1893222665] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:32:06,109 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:32:06,109 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:32:06,109 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [642894584] [2021-11-21 00:32:06,109 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:32:06,110 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:32:06,110 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:32:06,110 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:32:06,110 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:32:06,111 INFO L87 Difference]: Start difference. First operand 7231 states and 11778 transitions. Second operand has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-21 00:32:06,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:32:06,852 INFO L93 Difference]: Finished difference Result 20997 states and 34763 transitions. [2021-11-21 00:32:06,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:32:06,853 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) Word has length 95 [2021-11-21 00:32:06,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:32:06,994 INFO L225 Difference]: With dead ends: 20997 [2021-11-21 00:32:06,994 INFO L226 Difference]: Without dead ends: 13789 [2021-11-21 00:32:07,051 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:32:07,057 INFO L933 BasicCegarLoop]: 676 mSDtfsCounter, 545 mSDsluCounter, 569 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 545 SdHoareTripleChecker+Valid, 1214 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:32:07,058 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [545 Valid, 1214 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:32:07,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13789 states. [2021-11-21 00:32:07,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13789 to 13758. [2021-11-21 00:32:08,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13758 states, 9752 states have (on average 1.5778301886792452) internal successors, (15387), 10303 states have internal predecessors, (15387), 3129 states have call successors, (3129), 764 states have call predecessors, (3129), 876 states have return successors, (4245), 2879 states have call predecessors, (4245), 3124 states have call successors, (4245) [2021-11-21 00:32:08,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13758 states to 13758 states and 22761 transitions. [2021-11-21 00:32:08,247 INFO L78 Accepts]: Start accepts. Automaton has 13758 states and 22761 transitions. Word has length 95 [2021-11-21 00:32:08,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:32:08,249 INFO L470 AbstractCegarLoop]: Abstraction has 13758 states and 22761 transitions. [2021-11-21 00:32:08,250 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-21 00:32:08,251 INFO L276 IsEmpty]: Start isEmpty. Operand 13758 states and 22761 transitions. [2021-11-21 00:32:08,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-21 00:32:08,255 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:32:08,255 INFO L514 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:32:08,256 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-21 00:32:08,256 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:32:08,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:32:08,259 INFO L85 PathProgramCache]: Analyzing trace with hash -2123498207, now seen corresponding path program 1 times [2021-11-21 00:32:08,260 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:32:08,260 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [643969326] [2021-11-21 00:32:08,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:32:08,260 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:32:08,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:32:08,415 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 00:32:08,415 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:32:08,415 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [643969326] [2021-11-21 00:32:08,415 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [643969326] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:32:08,416 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:32:08,416 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-21 00:32:08,416 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1729244587] [2021-11-21 00:32:08,416 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:32:08,417 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-21 00:32:08,417 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:32:08,418 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-21 00:32:08,418 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:32:08,418 INFO L87 Difference]: Start difference. First operand 13758 states and 22761 transitions. Second operand has 8 states, 7 states have (on average 7.571428571428571) internal successors, (53), 7 states have internal predecessors, (53), 5 states have call successors, (18), 3 states have call predecessors, (18), 3 states have return successors, (17), 5 states have call predecessors, (17), 4 states have call successors, (17) [2021-11-21 00:32:12,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:32:12,366 INFO L93 Difference]: Finished difference Result 37843 states and 63447 transitions. [2021-11-21 00:32:12,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-21 00:32:12,366 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 7.571428571428571) internal successors, (53), 7 states have internal predecessors, (53), 5 states have call successors, (18), 3 states have call predecessors, (18), 3 states have return successors, (17), 5 states have call predecessors, (17), 4 states have call successors, (17) Word has length 95 [2021-11-21 00:32:12,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:32:12,545 INFO L225 Difference]: With dead ends: 37843 [2021-11-21 00:32:12,545 INFO L226 Difference]: Without dead ends: 24101 [2021-11-21 00:32:12,627 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=84, Invalid=336, Unknown=0, NotChecked=0, Total=420 [2021-11-21 00:32:12,630 INFO L933 BasicCegarLoop]: 876 mSDtfsCounter, 1263 mSDsluCounter, 1558 mSDsCounter, 0 mSdLazyCounter, 3887 mSolverCounterSat, 671 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1336 SdHoareTripleChecker+Valid, 2346 SdHoareTripleChecker+Invalid, 4558 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 671 IncrementalHoareTripleChecker+Valid, 3887 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2021-11-21 00:32:12,630 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1336 Valid, 2346 Invalid, 4558 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [671 Valid, 3887 Invalid, 0 Unknown, 0 Unchecked, 2.6s Time] [2021-11-21 00:32:12,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24101 states. [2021-11-21 00:32:14,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24101 to 22597. [2021-11-21 00:32:14,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22597 states, 15636 states have (on average 1.5519953952417498) internal successors, (24267), 16650 states have internal predecessors, (24267), 5510 states have call successors, (5510), 1205 states have call predecessors, (5510), 1450 states have return successors, (7376), 5085 states have call predecessors, (7376), 5505 states have call successors, (7376) [2021-11-21 00:32:14,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22597 states to 22597 states and 37153 transitions. [2021-11-21 00:32:14,596 INFO L78 Accepts]: Start accepts. Automaton has 22597 states and 37153 transitions. Word has length 95 [2021-11-21 00:32:14,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:32:14,597 INFO L470 AbstractCegarLoop]: Abstraction has 22597 states and 37153 transitions. [2021-11-21 00:32:14,597 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 7.571428571428571) internal successors, (53), 7 states have internal predecessors, (53), 5 states have call successors, (18), 3 states have call predecessors, (18), 3 states have return successors, (17), 5 states have call predecessors, (17), 4 states have call successors, (17) [2021-11-21 00:32:14,597 INFO L276 IsEmpty]: Start isEmpty. Operand 22597 states and 37153 transitions. [2021-11-21 00:32:14,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-21 00:32:14,601 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:32:14,602 INFO L514 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:32:14,602 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-21 00:32:14,602 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:32:14,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:32:14,603 INFO L85 PathProgramCache]: Analyzing trace with hash 2121424348, now seen corresponding path program 1 times [2021-11-21 00:32:14,603 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:32:14,607 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [561857426] [2021-11-21 00:32:14,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:32:14,607 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:32:14,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:32:14,706 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 00:32:14,706 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:32:14,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [561857426] [2021-11-21 00:32:14,707 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [561857426] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:32:14,707 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:32:14,707 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:32:14,707 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [587688001] [2021-11-21 00:32:14,708 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:32:14,708 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:32:14,709 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:32:14,709 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:32:14,709 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:32:14,710 INFO L87 Difference]: Start difference. First operand 22597 states and 37153 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-21 00:32:15,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:32:15,744 INFO L93 Difference]: Finished difference Result 23994 states and 39582 transitions. [2021-11-21 00:32:15,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:32:15,745 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) Word has length 96 [2021-11-21 00:32:15,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:32:15,909 INFO L225 Difference]: With dead ends: 23994 [2021-11-21 00:32:15,910 INFO L226 Difference]: Without dead ends: 23983 [2021-11-21 00:32:15,928 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:32:15,930 INFO L933 BasicCegarLoop]: 669 mSDtfsCounter, 531 mSDsluCounter, 573 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 531 SdHoareTripleChecker+Valid, 1212 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:32:15,931 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [531 Valid, 1212 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:32:15,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23983 states. [2021-11-21 00:32:17,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23983 to 23933. [2021-11-21 00:32:17,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23933 states, 16561 states have (on average 1.549966789445082) internal successors, (25669), 17636 states have internal predecessors, (25669), 5836 states have call successors, (5836), 1276 states have call predecessors, (5836), 1535 states have return successors, (7975), 5384 states have call predecessors, (7975), 5831 states have call successors, (7975) [2021-11-21 00:32:17,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23933 states to 23933 states and 39480 transitions. [2021-11-21 00:32:17,672 INFO L78 Accepts]: Start accepts. Automaton has 23933 states and 39480 transitions. Word has length 96 [2021-11-21 00:32:17,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:32:17,672 INFO L470 AbstractCegarLoop]: Abstraction has 23933 states and 39480 transitions. [2021-11-21 00:32:17,673 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-21 00:32:17,673 INFO L276 IsEmpty]: Start isEmpty. Operand 23933 states and 39480 transitions. [2021-11-21 00:32:17,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-11-21 00:32:17,683 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:32:17,684 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:32:17,684 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-21 00:32:17,684 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:32:17,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:32:17,685 INFO L85 PathProgramCache]: Analyzing trace with hash 1984437246, now seen corresponding path program 1 times [2021-11-21 00:32:17,685 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:32:17,686 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [605633994] [2021-11-21 00:32:17,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:32:17,686 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:32:17,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:32:17,805 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-11-21 00:32:17,805 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:32:17,806 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [605633994] [2021-11-21 00:32:17,806 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [605633994] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:32:17,806 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:32:17,806 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:32:17,806 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [932876301] [2021-11-21 00:32:17,807 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:32:17,807 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:32:17,807 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:32:17,808 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:32:17,808 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:32:17,808 INFO L87 Difference]: Start difference. First operand 23933 states and 39480 transitions. Second operand has 4 states, 4 states have (on average 18.25) internal successors, (73), 4 states have internal predecessors, (73), 2 states have call successors, (27), 2 states have call predecessors, (27), 2 states have return successors, (26), 2 states have call predecessors, (26), 2 states have call successors, (26) [2021-11-21 00:32:19,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:32:19,034 INFO L93 Difference]: Finished difference Result 48767 states and 81989 transitions. [2021-11-21 00:32:19,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 00:32:19,035 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.25) internal successors, (73), 4 states have internal predecessors, (73), 2 states have call successors, (27), 2 states have call predecessors, (27), 2 states have return successors, (26), 2 states have call predecessors, (26), 2 states have call successors, (26) Word has length 149 [2021-11-21 00:32:19,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:32:19,170 INFO L225 Difference]: With dead ends: 48767 [2021-11-21 00:32:19,170 INFO L226 Difference]: Without dead ends: 24851 [2021-11-21 00:32:19,264 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-21 00:32:19,265 INFO L933 BasicCegarLoop]: 554 mSDtfsCounter, 30 mSDsluCounter, 1144 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 1627 SdHoareTripleChecker+Invalid, 130 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:32:19,266 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 1627 Invalid, 130 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 115 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:32:19,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24851 states. [2021-11-21 00:32:20,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24851 to 24041. [2021-11-21 00:32:20,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24041 states, 16669 states have (on average 1.5464035035095087) internal successors, (25777), 17744 states have internal predecessors, (25777), 5836 states have call successors, (5836), 1276 states have call predecessors, (5836), 1535 states have return successors, (7975), 5384 states have call predecessors, (7975), 5831 states have call successors, (7975) [2021-11-21 00:32:20,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24041 states to 24041 states and 39588 transitions. [2021-11-21 00:32:20,990 INFO L78 Accepts]: Start accepts. Automaton has 24041 states and 39588 transitions. Word has length 149 [2021-11-21 00:32:20,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:32:20,991 INFO L470 AbstractCegarLoop]: Abstraction has 24041 states and 39588 transitions. [2021-11-21 00:32:20,991 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.25) internal successors, (73), 4 states have internal predecessors, (73), 2 states have call successors, (27), 2 states have call predecessors, (27), 2 states have return successors, (26), 2 states have call predecessors, (26), 2 states have call successors, (26) [2021-11-21 00:32:20,992 INFO L276 IsEmpty]: Start isEmpty. Operand 24041 states and 39588 transitions. [2021-11-21 00:32:21,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2021-11-21 00:32:21,004 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:32:21,005 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:32:21,005 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-21 00:32:21,006 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:32:21,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:32:21,007 INFO L85 PathProgramCache]: Analyzing trace with hash 564576189, now seen corresponding path program 1 times [2021-11-21 00:32:21,007 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:32:21,007 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1771760129] [2021-11-21 00:32:21,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:32:21,008 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:32:21,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:32:21,264 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 4 proven. 17 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2021-11-21 00:32:21,264 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:32:21,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1771760129] [2021-11-21 00:32:21,264 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1771760129] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:32:21,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1022482861] [2021-11-21 00:32:21,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:32:21,266 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:32:21,266 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:32:21,268 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:32:21,289 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 00:32:21,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:32:21,687 INFO L263 TraceCheckSpWp]: Trace formula consists of 2087 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 00:32:21,708 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:32:22,109 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 46 proven. 0 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-21 00:32:22,109 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:32:22,110 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1022482861] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:32:22,110 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:32:22,110 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [11] total 13 [2021-11-21 00:32:22,110 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1264845665] [2021-11-21 00:32:22,111 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:32:22,111 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:32:22,112 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:32:22,112 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:32:22,112 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2021-11-21 00:32:22,113 INFO L87 Difference]: Start difference. First operand 24041 states and 39588 transitions. Second operand has 4 states, 4 states have (on average 20.75) internal successors, (83), 4 states have internal predecessors, (83), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-21 00:32:23,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:32:23,872 INFO L93 Difference]: Finished difference Result 49469 states and 83913 transitions. [2021-11-21 00:32:23,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 00:32:23,872 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 20.75) internal successors, (83), 4 states have internal predecessors, (83), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) Word has length 152 [2021-11-21 00:32:23,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:32:24,042 INFO L225 Difference]: With dead ends: 49469 [2021-11-21 00:32:24,042 INFO L226 Difference]: Without dead ends: 25445 [2021-11-21 00:32:24,151 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 155 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=153, Unknown=0, NotChecked=0, Total=182 [2021-11-21 00:32:24,151 INFO L933 BasicCegarLoop]: 481 mSDtfsCounter, 213 mSDsluCounter, 1010 mSDsCounter, 0 mSdLazyCounter, 254 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 213 SdHoareTripleChecker+Valid, 1419 SdHoareTripleChecker+Invalid, 263 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 254 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:32:24,152 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [213 Valid, 1419 Invalid, 263 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 254 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:32:24,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25445 states. [2021-11-21 00:32:25,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25445 to 25445. [2021-11-21 00:32:25,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25445 states, 18037 states have (on average 1.5748184287852747) internal successors, (28405), 19112 states have internal predecessors, (28405), 5836 states have call successors, (5836), 1312 states have call predecessors, (5836), 1571 states have return successors, (7975), 5384 states have call predecessors, (7975), 5831 states have call successors, (7975) [2021-11-21 00:32:25,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25445 states to 25445 states and 42216 transitions. [2021-11-21 00:32:25,796 INFO L78 Accepts]: Start accepts. Automaton has 25445 states and 42216 transitions. Word has length 152 [2021-11-21 00:32:25,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:32:25,797 INFO L470 AbstractCegarLoop]: Abstraction has 25445 states and 42216 transitions. [2021-11-21 00:32:25,798 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 20.75) internal successors, (83), 4 states have internal predecessors, (83), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-21 00:32:25,798 INFO L276 IsEmpty]: Start isEmpty. Operand 25445 states and 42216 transitions. [2021-11-21 00:32:25,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2021-11-21 00:32:25,813 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:32:25,814 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:32:25,855 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 00:32:26,029 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:32:26,029 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:32:26,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:32:26,030 INFO L85 PathProgramCache]: Analyzing trace with hash 968921967, now seen corresponding path program 1 times [2021-11-21 00:32:26,030 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:32:26,030 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [828506208] [2021-11-21 00:32:26,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:32:26,031 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:32:26,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:32:26,166 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 9 proven. 15 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2021-11-21 00:32:26,166 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:32:26,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [828506208] [2021-11-21 00:32:26,166 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [828506208] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:32:26,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [655484856] [2021-11-21 00:32:26,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:32:26,167 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:32:26,167 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:32:26,168 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:32:26,191 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 00:32:26,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:32:26,580 INFO L263 TraceCheckSpWp]: Trace formula consists of 2092 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 00:32:26,595 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:32:26,900 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 62 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-21 00:32:26,901 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:32:26,901 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [655484856] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:32:26,901 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:32:26,901 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2021-11-21 00:32:26,902 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [547784886] [2021-11-21 00:32:26,902 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:32:26,903 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:32:26,903 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:32:26,903 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:32:26,903 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:32:26,904 INFO L87 Difference]: Start difference. First operand 25445 states and 42216 transitions. Second operand has 4 states, 4 states have (on average 21.75) internal successors, (87), 4 states have internal predecessors, (87), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-21 00:32:28,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:32:28,270 INFO L93 Difference]: Finished difference Result 52277 states and 89029 transitions. [2021-11-21 00:32:28,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 00:32:28,271 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 21.75) internal successors, (87), 4 states have internal predecessors, (87), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) Word has length 157 [2021-11-21 00:32:28,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:32:28,407 INFO L225 Difference]: With dead ends: 52277 [2021-11-21 00:32:28,407 INFO L226 Difference]: Without dead ends: 26849 [2021-11-21 00:32:28,503 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 157 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:32:28,504 INFO L933 BasicCegarLoop]: 481 mSDtfsCounter, 211 mSDsluCounter, 1010 mSDsCounter, 0 mSdLazyCounter, 248 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 211 SdHoareTripleChecker+Valid, 1419 SdHoareTripleChecker+Invalid, 262 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 248 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:32:28,504 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [211 Valid, 1419 Invalid, 262 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 248 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:32:28,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26849 states. [2021-11-21 00:32:29,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26849 to 26849. [2021-11-21 00:32:29,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26849 states, 19405 states have (on average 1.599227003349652) internal successors, (31033), 20480 states have internal predecessors, (31033), 5836 states have call successors, (5836), 1348 states have call predecessors, (5836), 1607 states have return successors, (7975), 5384 states have call predecessors, (7975), 5831 states have call successors, (7975) [2021-11-21 00:32:29,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26849 states to 26849 states and 44844 transitions. [2021-11-21 00:32:29,827 INFO L78 Accepts]: Start accepts. Automaton has 26849 states and 44844 transitions. Word has length 157 [2021-11-21 00:32:29,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:32:29,828 INFO L470 AbstractCegarLoop]: Abstraction has 26849 states and 44844 transitions. [2021-11-21 00:32:29,828 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 21.75) internal successors, (87), 4 states have internal predecessors, (87), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-21 00:32:29,828 INFO L276 IsEmpty]: Start isEmpty. Operand 26849 states and 44844 transitions. [2021-11-21 00:32:29,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2021-11-21 00:32:29,841 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:32:29,841 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:32:29,878 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 00:32:30,069 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:32:30,069 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:32:30,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:32:30,070 INFO L85 PathProgramCache]: Analyzing trace with hash 1424418927, now seen corresponding path program 1 times [2021-11-21 00:32:30,070 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:32:30,070 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [29067481] [2021-11-21 00:32:30,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:32:30,070 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:32:30,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:32:30,173 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 15 proven. 12 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-11-21 00:32:30,174 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:32:30,174 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [29067481] [2021-11-21 00:32:30,174 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [29067481] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:32:30,174 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2123564639] [2021-11-21 00:32:30,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:32:30,175 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:32:30,175 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:32:30,176 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:32:30,195 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 00:32:30,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:32:30,608 INFO L263 TraceCheckSpWp]: Trace formula consists of 2096 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 00:32:30,614 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:32:30,849 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 67 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-21 00:32:30,849 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:32:30,849 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2123564639] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:32:30,850 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:32:30,850 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2021-11-21 00:32:30,852 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1093754220] [2021-11-21 00:32:30,852 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:32:30,854 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:32:30,854 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:32:30,854 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:32:30,854 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:32:30,855 INFO L87 Difference]: Start difference. First operand 26849 states and 44844 transitions. Second operand has 4 states, 4 states have (on average 22.75) internal successors, (91), 4 states have internal predecessors, (91), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-21 00:32:32,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:32:32,294 INFO L93 Difference]: Finished difference Result 55085 states and 94145 transitions. [2021-11-21 00:32:32,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 00:32:32,295 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 22.75) internal successors, (91), 4 states have internal predecessors, (91), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) Word has length 161 [2021-11-21 00:32:32,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:32:32,470 INFO L225 Difference]: With dead ends: 55085 [2021-11-21 00:32:32,470 INFO L226 Difference]: Without dead ends: 28253 [2021-11-21 00:32:32,586 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 161 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:32:32,587 INFO L933 BasicCegarLoop]: 481 mSDtfsCounter, 209 mSDsluCounter, 1010 mSDsCounter, 0 mSdLazyCounter, 242 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 209 SdHoareTripleChecker+Valid, 1419 SdHoareTripleChecker+Invalid, 261 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 242 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:32:32,587 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [209 Valid, 1419 Invalid, 261 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 242 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:32:32,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28253 states. [2021-11-21 00:32:33,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28253 to 28253. [2021-11-21 00:32:33,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28253 states, 20773 states have (on average 1.620420738458576) internal successors, (33661), 21848 states have internal predecessors, (33661), 5836 states have call successors, (5836), 1384 states have call predecessors, (5836), 1643 states have return successors, (7975), 5384 states have call predecessors, (7975), 5831 states have call successors, (7975) [2021-11-21 00:32:33,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28253 states to 28253 states and 47472 transitions. [2021-11-21 00:32:33,858 INFO L78 Accepts]: Start accepts. Automaton has 28253 states and 47472 transitions. Word has length 161 [2021-11-21 00:32:33,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:32:33,859 INFO L470 AbstractCegarLoop]: Abstraction has 28253 states and 47472 transitions. [2021-11-21 00:32:33,859 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 22.75) internal successors, (91), 4 states have internal predecessors, (91), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-21 00:32:33,859 INFO L276 IsEmpty]: Start isEmpty. Operand 28253 states and 47472 transitions. [2021-11-21 00:32:33,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-11-21 00:32:33,869 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:32:33,869 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 4, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:32:33,909 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 00:32:34,097 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-21 00:32:34,097 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:32:34,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:32:34,098 INFO L85 PathProgramCache]: Analyzing trace with hash -1683096355, now seen corresponding path program 1 times [2021-11-21 00:32:34,098 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:32:34,098 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [804668757] [2021-11-21 00:32:34,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:32:34,098 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:32:34,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:32:34,860 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2021-11-21 00:32:34,860 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:32:34,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [804668757] [2021-11-21 00:32:34,861 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [804668757] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:32:34,861 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1972680566] [2021-11-21 00:32:34,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:32:34,861 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:32:34,861 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:32:34,869 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:32:34,870 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 00:32:35,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:32:35,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 2099 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 00:32:35,209 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:32:35,558 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 60 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-21 00:32:35,559 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:32:35,559 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1972680566] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:32:35,559 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:32:35,559 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [30] total 32 [2021-11-21 00:32:35,560 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1034211203] [2021-11-21 00:32:35,560 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:32:35,561 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:32:35,561 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:32:35,561 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:32:35,562 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=881, Unknown=0, NotChecked=0, Total=992 [2021-11-21 00:32:35,563 INFO L87 Difference]: Start difference. First operand 28253 states and 47472 transitions. Second operand has 4 states, 4 states have (on average 24.0) internal successors, (96), 4 states have internal predecessors, (96), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-21 00:32:36,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:32:36,676 INFO L93 Difference]: Finished difference Result 57893 states and 99261 transitions. [2021-11-21 00:32:36,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 00:32:36,676 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 24.0) internal successors, (96), 4 states have internal predecessors, (96), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) Word has length 164 [2021-11-21 00:32:36,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:32:36,818 INFO L225 Difference]: With dead ends: 57893 [2021-11-21 00:32:36,818 INFO L226 Difference]: Without dead ends: 29657 [2021-11-21 00:32:36,918 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 167 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 274 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=115, Invalid=941, Unknown=0, NotChecked=0, Total=1056 [2021-11-21 00:32:36,919 INFO L933 BasicCegarLoop]: 481 mSDtfsCounter, 207 mSDsluCounter, 1010 mSDsCounter, 0 mSdLazyCounter, 236 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 207 SdHoareTripleChecker+Valid, 1419 SdHoareTripleChecker+Invalid, 260 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 236 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:32:36,919 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [207 Valid, 1419 Invalid, 260 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 236 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:32:36,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29657 states. [2021-11-21 00:32:38,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29657 to 29657. [2021-11-21 00:32:38,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29657 states, 22141 states have (on average 1.6389955286572422) internal successors, (36289), 23216 states have internal predecessors, (36289), 5836 states have call successors, (5836), 1420 states have call predecessors, (5836), 1679 states have return successors, (7975), 5384 states have call predecessors, (7975), 5831 states have call successors, (7975) [2021-11-21 00:32:38,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29657 states to 29657 states and 50100 transitions. [2021-11-21 00:32:38,439 INFO L78 Accepts]: Start accepts. Automaton has 29657 states and 50100 transitions. Word has length 164 [2021-11-21 00:32:38,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:32:38,439 INFO L470 AbstractCegarLoop]: Abstraction has 29657 states and 50100 transitions. [2021-11-21 00:32:38,439 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 24.0) internal successors, (96), 4 states have internal predecessors, (96), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-21 00:32:38,439 INFO L276 IsEmpty]: Start isEmpty. Operand 29657 states and 50100 transitions. [2021-11-21 00:32:38,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2021-11-21 00:32:38,449 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:32:38,449 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:32:38,478 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 00:32:38,665 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-21 00:32:38,665 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:32:38,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:32:38,666 INFO L85 PathProgramCache]: Analyzing trace with hash -58534929, now seen corresponding path program 1 times [2021-11-21 00:32:38,666 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:32:38,666 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [127347912] [2021-11-21 00:32:38,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:32:38,666 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:32:38,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:32:39,424 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-11-21 00:32:39,424 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:32:39,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [127347912] [2021-11-21 00:32:39,424 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [127347912] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:32:39,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1896524513] [2021-11-21 00:32:39,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:32:39,425 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:32:39,425 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:32:39,426 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:32:39,441 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 00:32:39,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:32:39,797 INFO L263 TraceCheckSpWp]: Trace formula consists of 2095 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 00:32:39,808 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:32:40,244 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 79 trivial. 0 not checked. [2021-11-21 00:32:40,245 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:32:40,245 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1896524513] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:32:40,245 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:32:40,245 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [30] total 34 [2021-11-21 00:32:40,245 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1425054708] [2021-11-21 00:32:40,246 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:32:40,246 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:32:40,246 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:32:40,247 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:32:40,247 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1005, Unknown=0, NotChecked=0, Total=1122 [2021-11-21 00:32:40,247 INFO L87 Difference]: Start difference. First operand 29657 states and 50100 transitions. Second operand has 6 states, 5 states have (on average 17.4) internal successors, (87), 5 states have internal predecessors, (87), 3 states have call successors, (28), 3 states have call predecessors, (28), 4 states have return successors, (27), 4 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-21 00:32:41,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:32:41,575 INFO L93 Difference]: Finished difference Result 59422 states and 100470 transitions. [2021-11-21 00:32:41,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:32:41,575 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 17.4) internal successors, (87), 5 states have internal predecessors, (87), 3 states have call successors, (28), 3 states have call predecessors, (28), 4 states have return successors, (27), 4 states have call predecessors, (27), 2 states have call successors, (27) Word has length 166 [2021-11-21 00:32:41,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:32:41,674 INFO L225 Difference]: With dead ends: 59422 [2021-11-21 00:32:41,674 INFO L226 Difference]: Without dead ends: 29797 [2021-11-21 00:32:41,737 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 166 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 332 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=125, Invalid=1135, Unknown=0, NotChecked=0, Total=1260 [2021-11-21 00:32:41,738 INFO L933 BasicCegarLoop]: 627 mSDtfsCounter, 320 mSDsluCounter, 1887 mSDsCounter, 0 mSdLazyCounter, 345 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 322 SdHoareTripleChecker+Valid, 2386 SdHoareTripleChecker+Invalid, 347 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 345 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:32:41,738 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [322 Valid, 2386 Invalid, 347 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 345 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 00:32:41,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29797 states. [2021-11-21 00:32:42,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29797 to 29669. [2021-11-21 00:32:42,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29669 states, 22147 states have (on average 1.6340813654219533) internal successors, (36190), 23228 states have internal predecessors, (36190), 5836 states have call successors, (5836), 1420 states have call predecessors, (5836), 1685 states have return successors, (7985), 5384 states have call predecessors, (7985), 5831 states have call successors, (7985) [2021-11-21 00:32:42,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29669 states to 29669 states and 50011 transitions. [2021-11-21 00:32:42,789 INFO L78 Accepts]: Start accepts. Automaton has 29669 states and 50011 transitions. Word has length 166 [2021-11-21 00:32:42,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:32:42,789 INFO L470 AbstractCegarLoop]: Abstraction has 29669 states and 50011 transitions. [2021-11-21 00:32:42,790 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 17.4) internal successors, (87), 5 states have internal predecessors, (87), 3 states have call successors, (28), 3 states have call predecessors, (28), 4 states have return successors, (27), 4 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-21 00:32:42,790 INFO L276 IsEmpty]: Start isEmpty. Operand 29669 states and 50011 transitions. [2021-11-21 00:32:42,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2021-11-21 00:32:42,798 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:32:42,799 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:32:42,835 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 00:32:43,025 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:32:43,025 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:32:43,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:32:43,026 INFO L85 PathProgramCache]: Analyzing trace with hash -1401682805, now seen corresponding path program 1 times [2021-11-21 00:32:43,026 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:32:43,026 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [647181873] [2021-11-21 00:32:43,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:32:43,026 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:32:43,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:32:43,975 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-11-21 00:32:43,975 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:32:43,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [647181873] [2021-11-21 00:32:43,976 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [647181873] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:32:43,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [752769483] [2021-11-21 00:32:43,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:32:43,976 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:32:43,977 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:32:43,987 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:32:43,989 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 00:32:44,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:32:44,318 INFO L263 TraceCheckSpWp]: Trace formula consists of 2101 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 00:32:44,323 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:32:44,791 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-11-21 00:32:44,791 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:32:44,791 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [752769483] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:32:44,791 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:32:44,792 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [30] total 33 [2021-11-21 00:32:44,792 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [95861943] [2021-11-21 00:32:44,792 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:32:44,792 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 00:32:44,793 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:32:44,793 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 00:32:44,794 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=940, Unknown=0, NotChecked=0, Total=1056 [2021-11-21 00:32:44,794 INFO L87 Difference]: Start difference. First operand 29669 states and 50011 transitions. Second operand has 5 states, 5 states have (on average 17.8) internal successors, (89), 4 states have internal predecessors, (89), 2 states have call successors, (28), 2 states have call predecessors, (28), 2 states have return successors, (27), 2 states have call predecessors, (27), 1 states have call successors, (27) [2021-11-21 00:32:46,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:32:46,043 INFO L93 Difference]: Finished difference Result 30335 states and 51534 transitions. [2021-11-21 00:32:46,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 00:32:46,044 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 17.8) internal successors, (89), 4 states have internal predecessors, (89), 2 states have call successors, (28), 2 states have call predecessors, (28), 2 states have return successors, (27), 2 states have call predecessors, (27), 1 states have call successors, (27) Word has length 169 [2021-11-21 00:32:46,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:32:46,191 INFO L225 Difference]: With dead ends: 30335 [2021-11-21 00:32:46,191 INFO L226 Difference]: Without dead ends: 30249 [2021-11-21 00:32:46,208 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 170 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 278 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=116, Invalid=940, Unknown=0, NotChecked=0, Total=1056 [2021-11-21 00:32:46,209 INFO L933 BasicCegarLoop]: 546 mSDtfsCounter, 509 mSDsluCounter, 388 mSDsCounter, 0 mSdLazyCounter, 275 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 517 SdHoareTripleChecker+Valid, 900 SdHoareTripleChecker+Invalid, 290 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 275 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:32:46,209 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [517 Valid, 900 Invalid, 290 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 275 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 00:32:46,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30249 states. [2021-11-21 00:32:47,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30249 to 29701. [2021-11-21 00:32:47,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29701 states, 22179 states have (on average 1.6331665088597322) internal successors, (36222), 23260 states have internal predecessors, (36222), 5836 states have call successors, (5836), 1420 states have call predecessors, (5836), 1685 states have return successors, (7985), 5384 states have call predecessors, (7985), 5831 states have call successors, (7985) [2021-11-21 00:32:47,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29701 states to 29701 states and 50043 transitions. [2021-11-21 00:32:47,370 INFO L78 Accepts]: Start accepts. Automaton has 29701 states and 50043 transitions. Word has length 169 [2021-11-21 00:32:47,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:32:47,371 INFO L470 AbstractCegarLoop]: Abstraction has 29701 states and 50043 transitions. [2021-11-21 00:32:47,371 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 17.8) internal successors, (89), 4 states have internal predecessors, (89), 2 states have call successors, (28), 2 states have call predecessors, (28), 2 states have return successors, (27), 2 states have call predecessors, (27), 1 states have call successors, (27) [2021-11-21 00:32:47,371 INFO L276 IsEmpty]: Start isEmpty. Operand 29701 states and 50043 transitions. [2021-11-21 00:32:47,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2021-11-21 00:32:47,381 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:32:47,382 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:32:47,411 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2021-11-21 00:32:47,593 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-21 00:32:47,593 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:32:47,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:32:47,594 INFO L85 PathProgramCache]: Analyzing trace with hash -1058315205, now seen corresponding path program 1 times [2021-11-21 00:32:47,594 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:32:47,594 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1673906293] [2021-11-21 00:32:47,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:32:47,594 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:32:47,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:32:48,231 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-11-21 00:32:48,232 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:32:48,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1673906293] [2021-11-21 00:32:48,232 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1673906293] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:32:48,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1106075387] [2021-11-21 00:32:48,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:32:48,232 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:32:48,232 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:32:48,233 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:32:48,235 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 00:32:48,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:32:48,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 2116 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 00:32:48,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:32:49,060 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 79 trivial. 0 not checked. [2021-11-21 00:32:49,061 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:32:49,061 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1106075387] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:32:49,061 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:32:49,061 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [30] total 34 [2021-11-21 00:32:49,061 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1474695201] [2021-11-21 00:32:49,062 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:32:49,062 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:32:49,062 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:32:49,063 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:32:49,063 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1006, Unknown=0, NotChecked=0, Total=1122 [2021-11-21 00:32:49,063 INFO L87 Difference]: Start difference. First operand 29701 states and 50043 transitions. Second operand has 6 states, 5 states have (on average 18.6) internal successors, (93), 5 states have internal predecessors, (93), 3 states have call successors, (29), 3 states have call predecessors, (29), 4 states have return successors, (28), 4 states have call predecessors, (28), 2 states have call successors, (28) [2021-11-21 00:32:50,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:32:50,249 INFO L93 Difference]: Finished difference Result 33213 states and 57235 transitions. [2021-11-21 00:32:50,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 00:32:50,250 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 18.6) internal successors, (93), 5 states have internal predecessors, (93), 3 states have call successors, (29), 3 states have call predecessors, (29), 4 states have return successors, (28), 4 states have call predecessors, (28), 2 states have call successors, (28) Word has length 174 [2021-11-21 00:32:50,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:32:50,387 INFO L225 Difference]: With dead ends: 33213 [2021-11-21 00:32:50,387 INFO L226 Difference]: Without dead ends: 33127 [2021-11-21 00:32:50,411 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 174 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 345 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=131, Invalid=1201, Unknown=0, NotChecked=0, Total=1332 [2021-11-21 00:32:50,411 INFO L933 BasicCegarLoop]: 558 mSDtfsCounter, 492 mSDsluCounter, 1674 mSDsCounter, 0 mSdLazyCounter, 372 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 494 SdHoareTripleChecker+Valid, 2119 SdHoareTripleChecker+Invalid, 392 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 372 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:32:50,411 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [494 Valid, 2119 Invalid, 392 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 372 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 00:32:50,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33127 states. [2021-11-21 00:32:51,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33127 to 32306. [2021-11-21 00:32:51,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32306 states, 24102 states have (on average 1.6174176416894863) internal successors, (38983), 25185 states have internal predecessors, (38983), 6278 states have call successors, (6278), 1658 states have call predecessors, (6278), 1925 states have return successors, (10723), 5826 states have call predecessors, (10723), 6273 states have call successors, (10723) [2021-11-21 00:32:51,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32306 states to 32306 states and 55984 transitions. [2021-11-21 00:32:51,942 INFO L78 Accepts]: Start accepts. Automaton has 32306 states and 55984 transitions. Word has length 174 [2021-11-21 00:32:51,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:32:51,942 INFO L470 AbstractCegarLoop]: Abstraction has 32306 states and 55984 transitions. [2021-11-21 00:32:51,943 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 18.6) internal successors, (93), 5 states have internal predecessors, (93), 3 states have call successors, (29), 3 states have call predecessors, (29), 4 states have return successors, (28), 4 states have call predecessors, (28), 2 states have call successors, (28) [2021-11-21 00:32:51,943 INFO L276 IsEmpty]: Start isEmpty. Operand 32306 states and 55984 transitions. [2021-11-21 00:32:51,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2021-11-21 00:32:51,952 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:32:51,952 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 4, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:32:51,980 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 00:32:52,152 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-21 00:32:52,153 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:32:52,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:32:52,154 INFO L85 PathProgramCache]: Analyzing trace with hash 1670511901, now seen corresponding path program 1 times [2021-11-21 00:32:52,154 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:32:52,154 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1836778962] [2021-11-21 00:32:52,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:32:52,154 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:32:52,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:32:52,864 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-21 00:32:52,864 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:32:52,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1836778962] [2021-11-21 00:32:52,864 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1836778962] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:32:52,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2125794560] [2021-11-21 00:32:52,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:32:52,865 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:32:52,865 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:32:52,873 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:32:52,874 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 00:32:53,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:32:53,171 INFO L263 TraceCheckSpWp]: Trace formula consists of 2146 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-21 00:32:53,176 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:32:53,513 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 85 trivial. 0 not checked. [2021-11-21 00:32:53,513 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:32:53,513 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2125794560] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:32:53,514 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:32:53,514 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [30] total 32 [2021-11-21 00:32:53,514 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1334965751] [2021-11-21 00:32:53,514 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:32:53,515 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:32:53,515 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:32:53,516 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:32:53,516 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=881, Unknown=0, NotChecked=0, Total=992 [2021-11-21 00:32:53,516 INFO L87 Difference]: Start difference. First operand 32306 states and 55984 transitions. Second operand has 4 states, 4 states have (on average 24.0) internal successors, (96), 4 states have internal predecessors, (96), 2 states have call successors, (30), 2 states have call predecessors, (30), 2 states have return successors, (29), 2 states have call predecessors, (29), 1 states have call successors, (29) [2021-11-21 00:32:54,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:32:54,650 INFO L93 Difference]: Finished difference Result 33844 states and 62312 transitions. [2021-11-21 00:32:54,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 00:32:54,651 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 24.0) internal successors, (96), 4 states have internal predecessors, (96), 2 states have call successors, (30), 2 states have call predecessors, (30), 2 states have return successors, (29), 2 states have call predecessors, (29), 1 states have call successors, (29) Word has length 181 [2021-11-21 00:32:54,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:32:54,800 INFO L225 Difference]: With dead ends: 33844 [2021-11-21 00:32:54,800 INFO L226 Difference]: Without dead ends: 33758 [2021-11-21 00:32:54,824 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 184 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 274 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=115, Invalid=941, Unknown=0, NotChecked=0, Total=1056 [2021-11-21 00:32:54,825 INFO L933 BasicCegarLoop]: 583 mSDtfsCounter, 47 mSDsluCounter, 1182 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 1696 SdHoareTripleChecker+Invalid, 132 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:32:54,825 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 1696 Invalid, 132 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:32:54,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33758 states. [2021-11-21 00:32:56,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33758 to 32498. [2021-11-21 00:32:56,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32498 states, 24294 states have (on average 1.6125380752449165) internal successors, (39175), 25377 states have internal predecessors, (39175), 6278 states have call successors, (6278), 1658 states have call predecessors, (6278), 1925 states have return successors, (10723), 5826 states have call predecessors, (10723), 6273 states have call successors, (10723) [2021-11-21 00:32:56,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32498 states to 32498 states and 56176 transitions. [2021-11-21 00:32:56,351 INFO L78 Accepts]: Start accepts. Automaton has 32498 states and 56176 transitions. Word has length 181 [2021-11-21 00:32:56,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:32:56,352 INFO L470 AbstractCegarLoop]: Abstraction has 32498 states and 56176 transitions. [2021-11-21 00:32:56,352 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 24.0) internal successors, (96), 4 states have internal predecessors, (96), 2 states have call successors, (30), 2 states have call predecessors, (30), 2 states have return successors, (29), 2 states have call predecessors, (29), 1 states have call successors, (29) [2021-11-21 00:32:56,352 INFO L276 IsEmpty]: Start isEmpty. Operand 32498 states and 56176 transitions. [2021-11-21 00:32:56,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 301 [2021-11-21 00:32:56,360 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:32:56,361 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 8, 6, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:32:56,384 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-21 00:32:56,561 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-21 00:32:56,562 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:32:56,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:32:56,562 INFO L85 PathProgramCache]: Analyzing trace with hash -1001786897, now seen corresponding path program 1 times [2021-11-21 00:32:56,562 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:32:56,562 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1879130057] [2021-11-21 00:32:56,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:32:56,562 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:32:56,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:32:56,724 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 12 proven. 87 refuted. 0 times theorem prover too weak. 342 trivial. 0 not checked. [2021-11-21 00:32:56,724 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:32:56,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1879130057] [2021-11-21 00:32:56,724 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1879130057] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:32:56,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1784870021] [2021-11-21 00:32:56,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:32:56,725 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:32:56,726 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:32:56,726 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:32:56,749 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_46ec5ac1-f8d8-4fc7-a2ee-580fcd5722b4/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-21 00:32:57,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:32:57,179 INFO L263 TraceCheckSpWp]: Trace formula consists of 2935 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-21 00:32:57,186 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:32:57,884 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 439 trivial. 0 not checked. [2021-11-21 00:32:57,885 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:32:58,718 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 439 trivial. 0 not checked. [2021-11-21 00:32:58,718 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1784870021] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:32:58,718 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1305015092] [2021-11-21 00:32:58,743 INFO L159 IcfgInterpreter]: Started Sifa with 145 locations of interest [2021-11-21 00:32:58,743 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:32:58,749 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:32:58,755 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:32:58,755 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:34:31,699 INFO L197 IcfgInterpreter]: Interpreting procedure __automaton_fail with input of size 423 for LOIs [2021-11-21 00:34:33,017 INFO L197 IcfgInterpreter]: Interpreting procedure cleanup with input of size 598 for LOIs [2021-11-21 00:42:20,525 INFO L197 IcfgInterpreter]: Interpreting procedure timeShift with input of size 727 for LOIs