./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/elevator_spec2_product03.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_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/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_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/elevator_spec2_product03.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/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_844efb62-3ee9-4047-bb19-2d5a99ad16e8/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 859441835e916fdbcdc78c3c849990624cc8f637b8bbdd3bb312aaefa9b36e0f --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 23:32:55,186 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 23:32:55,188 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 23:32:55,250 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 23:32:55,251 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 23:32:55,256 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 23:32:55,258 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 23:32:55,262 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 23:32:55,265 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 23:32:55,273 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 23:32:55,274 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 23:32:55,276 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 23:32:55,276 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 23:32:55,280 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 23:32:55,282 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 23:32:55,289 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 23:32:55,290 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 23:32:55,293 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 23:32:55,296 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 23:32:55,303 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 23:32:55,304 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 23:32:55,306 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 23:32:55,307 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 23:32:55,308 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 23:32:55,312 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 23:32:55,312 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 23:32:55,313 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 23:32:55,314 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 23:32:55,314 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 23:32:55,320 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 23:32:55,321 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 23:32:55,322 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 23:32:55,323 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 23:32:55,325 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 23:32:55,327 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 23:32:55,327 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 23:32:55,328 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 23:32:55,328 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 23:32:55,328 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 23:32:55,329 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 23:32:55,330 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 23:32:55,331 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-20 23:32:55,369 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 23:32:55,370 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 23:32:55,370 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 23:32:55,370 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 23:32:55,371 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 23:32:55,371 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 23:32:55,371 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-20 23:32:55,371 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-20 23:32:55,372 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-20 23:32:55,372 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-20 23:32:55,372 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-20 23:32:55,372 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-20 23:32:55,372 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-20 23:32:55,373 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-20 23:32:55,373 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-20 23:32:55,373 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-20 23:32:55,373 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-20 23:32:55,373 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-20 23:32:55,374 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 23:32:55,374 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 23:32:55,375 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 23:32:55,375 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 23:32:55,375 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 23:32:55,375 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-20 23:32:55,375 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 23:32:55,376 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-20 23:32:55,376 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 23:32:55,376 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-20 23:32:55,376 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 23:32:55,376 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-20 23:32:55,377 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 23:32:55,377 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 23:32:55,377 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:32:55,377 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 23:32:55,378 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 23:32:55,378 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-20 23:32:55,378 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-20 23:32:55,378 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 23:32:55,378 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-20 23:32:55,379 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 23:32:55,379 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-20 23:32:55,379 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_844efb62-3ee9-4047-bb19-2d5a99ad16e8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 859441835e916fdbcdc78c3c849990624cc8f637b8bbdd3bb312aaefa9b36e0f [2021-11-20 23:32:55,643 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 23:32:55,664 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 23:32:55,666 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 23:32:55,667 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 23:32:55,668 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 23:32:55,669 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/product-lines/elevator_spec2_product03.cil.c [2021-11-20 23:32:55,731 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/data/483032cbe/067efa273e7041fdbf1a80ef3693ffee/FLAG3f1b100a7 [2021-11-20 23:32:56,339 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 23:32:56,342 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/sv-benchmarks/c/product-lines/elevator_spec2_product03.cil.c [2021-11-20 23:32:56,379 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/data/483032cbe/067efa273e7041fdbf1a80ef3693ffee/FLAG3f1b100a7 [2021-11-20 23:32:56,547 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/data/483032cbe/067efa273e7041fdbf1a80ef3693ffee [2021-11-20 23:32:56,553 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 23:32:56,556 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 23:32:56,559 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 23:32:56,559 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 23:32:56,563 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 23:32:56,564 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:32:56" (1/1) ... [2021-11-20 23:32:56,566 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@f562bbc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:32:56, skipping insertion in model container [2021-11-20 23:32:56,567 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:32:56" (1/1) ... [2021-11-20 23:32:56,575 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 23:32:56,644 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 23:32:57,008 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_844efb62-3ee9-4047-bb19-2d5a99ad16e8/sv-benchmarks/c/product-lines/elevator_spec2_product03.cil.c[29828,29841] [2021-11-20 23:32:57,254 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:32:57,265 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 23:32:57,323 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_844efb62-3ee9-4047-bb19-2d5a99ad16e8/sv-benchmarks/c/product-lines/elevator_spec2_product03.cil.c[29828,29841] [2021-11-20 23:32:57,374 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:32:57,402 INFO L208 MainTranslator]: Completed translation [2021-11-20 23:32:57,403 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:32:57 WrapperNode [2021-11-20 23:32:57,403 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 23:32:57,404 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 23:32:57,404 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 23:32:57,405 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 23:32:57,412 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:32:57" (1/1) ... [2021-11-20 23:32:57,440 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:32:57" (1/1) ... [2021-11-20 23:32:57,504 INFO L137 Inliner]: procedures = 92, calls = 336, calls flagged for inlining = 23, calls inlined = 20, statements flattened = 1071 [2021-11-20 23:32:57,504 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 23:32:57,505 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 23:32:57,505 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 23:32:57,506 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 23:32:57,514 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:32:57" (1/1) ... [2021-11-20 23:32:57,514 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:32:57" (1/1) ... [2021-11-20 23:32:57,520 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:32:57" (1/1) ... [2021-11-20 23:32:57,520 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:32:57" (1/1) ... [2021-11-20 23:32:57,562 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:32:57" (1/1) ... [2021-11-20 23:32:57,579 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:32:57" (1/1) ... [2021-11-20 23:32:57,586 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:32:57" (1/1) ... [2021-11-20 23:32:57,598 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 23:32:57,599 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 23:32:57,599 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 23:32:57,599 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 23:32:57,600 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:32:57" (1/1) ... [2021-11-20 23:32:57,615 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:32:57,628 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:32:57,640 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 23:32:57,668 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 23:32:57,702 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 23:32:57,703 INFO L130 BoogieDeclarations]: Found specification of procedure bigMacCall [2021-11-20 23:32:57,703 INFO L138 BoogieDeclarations]: Found implementation of procedure bigMacCall [2021-11-20 23:32:57,703 INFO L130 BoogieDeclarations]: Found specification of procedure enterElevator [2021-11-20 23:32:57,703 INFO L138 BoogieDeclarations]: Found implementation of procedure enterElevator [2021-11-20 23:32:57,704 INFO L130 BoogieDeclarations]: Found specification of procedure isExecutiveFloorCalling [2021-11-20 23:32:57,704 INFO L138 BoogieDeclarations]: Found implementation of procedure isExecutiveFloorCalling [2021-11-20 23:32:57,704 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection [2021-11-20 23:32:57,704 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection [2021-11-20 23:32:57,704 INFO L130 BoogieDeclarations]: Found specification of procedure getReverseHeading [2021-11-20 23:32:57,704 INFO L138 BoogieDeclarations]: Found implementation of procedure getReverseHeading [2021-11-20 23:32:57,704 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift [2021-11-20 23:32:57,704 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift [2021-11-20 23:32:57,704 INFO L130 BoogieDeclarations]: Found specification of procedure cleanup [2021-11-20 23:32:57,704 INFO L138 BoogieDeclarations]: Found implementation of procedure cleanup [2021-11-20 23:32:57,705 INFO L130 BoogieDeclarations]: Found specification of procedure areDoorsOpen [2021-11-20 23:32:57,705 INFO L138 BoogieDeclarations]: Found implementation of procedure areDoorsOpen [2021-11-20 23:32:57,705 INFO L130 BoogieDeclarations]: Found specification of procedure __automaton_fail [2021-11-20 23:32:57,705 INFO L138 BoogieDeclarations]: Found implementation of procedure __automaton_fail [2021-11-20 23:32:57,705 INFO L130 BoogieDeclarations]: Found specification of procedure isTopFloor [2021-11-20 23:32:57,706 INFO L138 BoogieDeclarations]: Found implementation of procedure isTopFloor [2021-11-20 23:32:57,706 INFO L130 BoogieDeclarations]: Found specification of procedure getDestination [2021-11-20 23:32:57,706 INFO L138 BoogieDeclarations]: Found implementation of procedure getDestination [2021-11-20 23:32:57,706 INFO L130 BoogieDeclarations]: Found specification of procedure isBlocked [2021-11-20 23:32:57,706 INFO L138 BoogieDeclarations]: Found implementation of procedure isBlocked [2021-11-20 23:32:57,707 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentFloorID [2021-11-20 23:32:57,707 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentFloorID [2021-11-20 23:32:57,707 INFO L130 BoogieDeclarations]: Found specification of procedure resetCallOnFloor [2021-11-20 23:32:57,707 INFO L138 BoogieDeclarations]: Found implementation of procedure resetCallOnFloor [2021-11-20 23:32:57,707 INFO L130 BoogieDeclarations]: Found specification of procedure initPersonOnFloor [2021-11-20 23:32:57,707 INFO L138 BoogieDeclarations]: Found implementation of procedure initPersonOnFloor [2021-11-20 23:32:57,708 INFO L130 BoogieDeclarations]: Found specification of procedure removePersonFromFloor [2021-11-20 23:32:57,708 INFO L138 BoogieDeclarations]: Found implementation of procedure removePersonFromFloor [2021-11-20 23:32:57,708 INFO L130 BoogieDeclarations]: Found specification of procedure getOrigin [2021-11-20 23:32:57,708 INFO L138 BoogieDeclarations]: Found implementation of procedure getOrigin [2021-11-20 23:32:57,708 INFO L130 BoogieDeclarations]: Found specification of procedure continueInDirection [2021-11-20 23:32:57,709 INFO L138 BoogieDeclarations]: Found implementation of procedure continueInDirection [2021-11-20 23:32:57,709 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedAtCurrentFloor__wrappee__base [2021-11-20 23:32:57,709 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedAtCurrentFloor__wrappee__base [2021-11-20 23:32:57,709 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-20 23:32:57,709 INFO L130 BoogieDeclarations]: Found specification of procedure pressInLiftFloorButton [2021-11-20 23:32:57,709 INFO L138 BoogieDeclarations]: Found implementation of procedure pressInLiftFloorButton [2021-11-20 23:32:57,710 INFO L130 BoogieDeclarations]: Found specification of procedure leaveElevator [2021-11-20 23:32:57,710 INFO L138 BoogieDeclarations]: Found implementation of procedure leaveElevator [2021-11-20 23:32:57,710 INFO L130 BoogieDeclarations]: Found specification of procedure isPersonOnFloor [2021-11-20 23:32:57,710 INFO L138 BoogieDeclarations]: Found implementation of procedure isPersonOnFloor [2021-11-20 23:32:57,710 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 23:32:57,711 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 23:32:57,711 INFO L130 BoogieDeclarations]: Found specification of procedure isFloorCalling [2021-11-20 23:32:57,711 INFO L138 BoogieDeclarations]: Found implementation of procedure isFloorCalling [2021-11-20 23:32:57,891 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 23:32:57,893 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 23:32:58,972 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 23:32:59,579 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 23:32:59,579 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-20 23:32:59,582 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:32:59 BoogieIcfgContainer [2021-11-20 23:32:59,583 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 23:32:59,584 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 23:32:59,585 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 23:32:59,588 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 23:32:59,589 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 11:32:56" (1/3) ... [2021-11-20 23:32:59,590 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@a170001 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:32:59, skipping insertion in model container [2021-11-20 23:32:59,590 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:32:57" (2/3) ... [2021-11-20 23:32:59,590 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@a170001 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:32:59, skipping insertion in model container [2021-11-20 23:32:59,590 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:32:59" (3/3) ... [2021-11-20 23:32:59,592 INFO L111 eAbstractionObserver]: Analyzing ICFG elevator_spec2_product03.cil.c [2021-11-20 23:32:59,597 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 23:32:59,598 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-20 23:32:59,651 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 23:32:59,659 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 [2021-11-20 23:32:59,659 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-20 23:32:59,710 INFO L276 IsEmpty]: Start isEmpty. Operand has 368 states, 249 states have (on average 1.6024096385542168) internal successors, (399), 270 states have internal predecessors, (399), 94 states have call successors, (94), 23 states have call predecessors, (94), 23 states have return successors, (94), 88 states have call predecessors, (94), 94 states have call successors, (94) [2021-11-20 23:32:59,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-20 23:32:59,741 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:32:59,742 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-20 23:32:59,766 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:32:59,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:32:59,772 INFO L85 PathProgramCache]: Analyzing trace with hash -22457928, now seen corresponding path program 1 times [2021-11-20 23:32:59,782 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:32:59,782 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1046144245] [2021-11-20 23:32:59,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:32:59,784 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:33:00,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:00,307 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-20 23:33:00,308 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:33:00,308 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1046144245] [2021-11-20 23:33:00,309 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1046144245] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:33:00,310 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:33:00,311 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 23:33:00,312 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1442506655] [2021-11-20 23:33:00,313 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:33:00,318 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-20 23:33:00,319 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:33:00,349 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-20 23:33:00,351 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-20 23:33:00,356 INFO L87 Difference]: Start difference. First operand has 368 states, 249 states have (on average 1.6024096385542168) internal successors, (399), 270 states have internal predecessors, (399), 94 states have call successors, (94), 23 states have call predecessors, (94), 23 states have return successors, (94), 88 states have call predecessors, (94), 94 states have call successors, (94) Second operand has 2 states, 2 states have (on average 22.5) internal successors, (45), 2 states have internal predecessors, (45), 2 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 2 states have call predecessors, (12), 1 states have call successors, (12) [2021-11-20 23:33:00,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:33:00,561 INFO L93 Difference]: Finished difference Result 386 states and 614 transitions. [2021-11-20 23:33:00,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-20 23:33:00,564 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 22.5) internal successors, (45), 2 states have internal predecessors, (45), 2 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 2 states have call predecessors, (12), 1 states have call successors, (12) Word has length 76 [2021-11-20 23:33:00,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:33:00,593 INFO L225 Difference]: With dead ends: 386 [2021-11-20 23:33:00,594 INFO L226 Difference]: Without dead ends: 364 [2021-11-20 23:33:00,598 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 [2021-11-20 23:33:00,602 INFO L933 BasicCegarLoop]: 547 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 547 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:33:00,603 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 547 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:33:00,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 364 states. [2021-11-20 23:33:00,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 364 to 364. [2021-11-20 23:33:00,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 364 states, 247 states have (on average 1.591093117408907) internal successors, (393), 266 states have internal predecessors, (393), 94 states have call successors, (94), 23 states have call predecessors, (94), 22 states have return successors, (89), 87 states have call predecessors, (89), 89 states have call successors, (89) [2021-11-20 23:33:00,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 364 states to 364 states and 576 transitions. [2021-11-20 23:33:00,703 INFO L78 Accepts]: Start accepts. Automaton has 364 states and 576 transitions. Word has length 76 [2021-11-20 23:33:00,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:33:00,705 INFO L470 AbstractCegarLoop]: Abstraction has 364 states and 576 transitions. [2021-11-20 23:33:00,705 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 22.5) internal successors, (45), 2 states have internal predecessors, (45), 2 states have call successors, (13), 2 states have call predecessors, (13), 2 states have return successors, (12), 2 states have call predecessors, (12), 1 states have call successors, (12) [2021-11-20 23:33:00,705 INFO L276 IsEmpty]: Start isEmpty. Operand 364 states and 576 transitions. [2021-11-20 23:33:00,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-11-20 23:33:00,711 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:33:00,712 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-20 23:33:00,712 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-20 23:33:00,713 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:33:00,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:33:00,714 INFO L85 PathProgramCache]: Analyzing trace with hash 1412848271, now seen corresponding path program 1 times [2021-11-20 23:33:00,714 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:33:00,714 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1466221000] [2021-11-20 23:33:00,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:33:00,715 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:33:00,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:01,001 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-20 23:33:01,002 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:33:01,002 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1466221000] [2021-11-20 23:33:01,002 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1466221000] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:33:01,003 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:33:01,003 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-20 23:33:01,003 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1733258281] [2021-11-20 23:33:01,003 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:33:01,004 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-20 23:33:01,005 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:33:01,005 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-20 23:33:01,005 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-20 23:33:01,006 INFO L87 Difference]: Start difference. First operand 364 states and 576 transitions. Second operand has 8 states, 8 states have (on average 5.75) internal successors, (46), 8 states have internal predecessors, (46), 6 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 6 states have call predecessors, (12), 5 states have call successors, (12) [2021-11-20 23:33:03,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:33:03,688 INFO L93 Difference]: Finished difference Result 1248 states and 2004 transitions. [2021-11-20 23:33:03,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-20 23:33:03,689 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.75) internal successors, (46), 8 states have internal predecessors, (46), 6 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 6 states have call predecessors, (12), 5 states have call successors, (12) Word has length 77 [2021-11-20 23:33:03,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:33:03,721 INFO L225 Difference]: With dead ends: 1248 [2021-11-20 23:33:03,722 INFO L226 Difference]: Without dead ends: 900 [2021-11-20 23:33:03,736 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=103, Invalid=277, Unknown=0, NotChecked=0, Total=380 [2021-11-20 23:33:03,739 INFO L933 BasicCegarLoop]: 767 mSDtfsCounter, 1945 mSDsluCounter, 1989 mSDsCounter, 0 mSdLazyCounter, 2453 mSolverCounterSat, 581 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2011 SdHoareTripleChecker+Valid, 2651 SdHoareTripleChecker+Invalid, 3034 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 581 IncrementalHoareTripleChecker+Valid, 2453 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:33:03,739 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2011 Valid, 2651 Invalid, 3034 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [581 Valid, 2453 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2021-11-20 23:33:03,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 900 states. [2021-11-20 23:33:03,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 900 to 842. [2021-11-20 23:33:03,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 842 states, 591 states have (on average 1.6125211505922166) internal successors, (953), 626 states have internal predecessors, (953), 201 states have call successors, (201), 47 states have call predecessors, (201), 49 states have return successors, (202), 193 states have call predecessors, (202), 196 states have call successors, (202) [2021-11-20 23:33:03,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 842 states to 842 states and 1356 transitions. [2021-11-20 23:33:03,877 INFO L78 Accepts]: Start accepts. Automaton has 842 states and 1356 transitions. Word has length 77 [2021-11-20 23:33:03,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:33:03,880 INFO L470 AbstractCegarLoop]: Abstraction has 842 states and 1356 transitions. [2021-11-20 23:33:03,880 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.75) internal successors, (46), 8 states have internal predecessors, (46), 6 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 6 states have call predecessors, (12), 5 states have call successors, (12) [2021-11-20 23:33:03,880 INFO L276 IsEmpty]: Start isEmpty. Operand 842 states and 1356 transitions. [2021-11-20 23:33:03,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-20 23:33:03,887 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:33:03,888 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] [2021-11-20 23:33:03,888 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-20 23:33:03,889 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:33:03,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:33:03,890 INFO L85 PathProgramCache]: Analyzing trace with hash 2043519656, now seen corresponding path program 1 times [2021-11-20 23:33:03,890 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:33:03,891 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1755993677] [2021-11-20 23:33:03,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:33:03,891 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:33:03,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:04,079 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-20 23:33:04,080 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:33:04,080 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1755993677] [2021-11-20 23:33:04,080 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1755993677] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:33:04,081 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:33:04,081 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-20 23:33:04,082 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [333167350] [2021-11-20 23:33:04,083 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:33:04,083 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-20 23:33:04,084 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:33:04,084 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-20 23:33:04,086 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-20 23:33:04,086 INFO L87 Difference]: Start difference. First operand 842 states and 1356 transitions. Second operand has 7 states, 7 states have (on average 6.285714285714286) internal successors, (44), 7 states have internal predecessors, (44), 5 states have call successors, (14), 3 states have call predecessors, (14), 3 states have return successors, (13), 5 states have call predecessors, (13), 4 states have call successors, (13) [2021-11-20 23:33:06,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:33:06,021 INFO L93 Difference]: Finished difference Result 1469 states and 2367 transitions. [2021-11-20 23:33:06,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-20 23:33:06,022 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 6.285714285714286) internal successors, (44), 7 states have internal predecessors, (44), 5 states have call successors, (14), 3 states have call predecessors, (14), 3 states have return successors, (13), 5 states have call predecessors, (13), 4 states have call successors, (13) Word has length 78 [2021-11-20 23:33:06,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:33:06,029 INFO L225 Difference]: With dead ends: 1469 [2021-11-20 23:33:06,030 INFO L226 Difference]: Without dead ends: 967 [2021-11-20 23:33:06,036 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2021-11-20 23:33:06,045 INFO L933 BasicCegarLoop]: 605 mSDtfsCounter, 1119 mSDsluCounter, 1349 mSDsCounter, 0 mSdLazyCounter, 2172 mSolverCounterSat, 432 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1194 SdHoareTripleChecker+Valid, 1879 SdHoareTripleChecker+Invalid, 2604 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 432 IncrementalHoareTripleChecker+Valid, 2172 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2021-11-20 23:33:06,047 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1194 Valid, 1879 Invalid, 2604 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [432 Valid, 2172 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2021-11-20 23:33:06,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 967 states. [2021-11-20 23:33:06,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 967 to 858. [2021-11-20 23:33:06,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 858 states, 601 states have (on average 1.605657237936772) internal successors, (965), 639 states have internal predecessors, (965), 203 states have call successors, (203), 50 states have call predecessors, (203), 53 states have return successors, (210), 193 states have call predecessors, (210), 198 states have call successors, (210) [2021-11-20 23:33:06,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 858 states to 858 states and 1378 transitions. [2021-11-20 23:33:06,128 INFO L78 Accepts]: Start accepts. Automaton has 858 states and 1378 transitions. Word has length 78 [2021-11-20 23:33:06,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:33:06,129 INFO L470 AbstractCegarLoop]: Abstraction has 858 states and 1378 transitions. [2021-11-20 23:33:06,129 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 6.285714285714286) internal successors, (44), 7 states have internal predecessors, (44), 5 states have call successors, (14), 3 states have call predecessors, (14), 3 states have return successors, (13), 5 states have call predecessors, (13), 4 states have call successors, (13) [2021-11-20 23:33:06,130 INFO L276 IsEmpty]: Start isEmpty. Operand 858 states and 1378 transitions. [2021-11-20 23:33:06,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-20 23:33:06,135 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:33:06,135 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] [2021-11-20 23:33:06,135 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-20 23:33:06,136 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:33:06,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:33:06,137 INFO L85 PathProgramCache]: Analyzing trace with hash -623604157, now seen corresponding path program 1 times [2021-11-20 23:33:06,137 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:33:06,137 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1657885513] [2021-11-20 23:33:06,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:33:06,138 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:33:06,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:06,301 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-20 23:33:06,302 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:33:06,302 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1657885513] [2021-11-20 23:33:06,302 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1657885513] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:33:06,302 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:33:06,303 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-20 23:33:06,303 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [432416765] [2021-11-20 23:33:06,303 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:33:06,305 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:33:06,305 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:33:06,305 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:33:06,306 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:33:06,306 INFO L87 Difference]: Start difference. First operand 858 states and 1378 transitions. Second operand has 4 states, 4 states have (on average 11.5) internal successors, (46), 4 states have internal predecessors, (46), 4 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) [2021-11-20 23:33:07,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:33:07,448 INFO L93 Difference]: Finished difference Result 2737 states and 4461 transitions. [2021-11-20 23:33:07,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:33:07,449 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.5) internal successors, (46), 4 states have internal predecessors, (46), 4 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) Word has length 82 [2021-11-20 23:33:07,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:33:07,465 INFO L225 Difference]: With dead ends: 2737 [2021-11-20 23:33:07,466 INFO L226 Difference]: Without dead ends: 1895 [2021-11-20 23:33:07,471 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:33:07,473 INFO L933 BasicCegarLoop]: 552 mSDtfsCounter, 1140 mSDsluCounter, 415 mSDsCounter, 0 mSdLazyCounter, 688 mSolverCounterSat, 379 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1210 SdHoareTripleChecker+Valid, 943 SdHoareTripleChecker+Invalid, 1067 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 379 IncrementalHoareTripleChecker+Valid, 688 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:33:07,473 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1210 Valid, 943 Invalid, 1067 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [379 Valid, 688 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-20 23:33:07,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1895 states. [2021-11-20 23:33:07,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1895 to 1729. [2021-11-20 23:33:07,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1729 states, 1233 states have (on average 1.6131386861313868) internal successors, (1989), 1306 states have internal predecessors, (1989), 393 states have call successors, (393), 91 states have call predecessors, (393), 102 states have return successors, (423), 367 states have call predecessors, (423), 388 states have call successors, (423) [2021-11-20 23:33:07,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1729 states to 1729 states and 2805 transitions. [2021-11-20 23:33:07,605 INFO L78 Accepts]: Start accepts. Automaton has 1729 states and 2805 transitions. Word has length 82 [2021-11-20 23:33:07,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:33:07,606 INFO L470 AbstractCegarLoop]: Abstraction has 1729 states and 2805 transitions. [2021-11-20 23:33:07,606 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.5) internal successors, (46), 4 states have internal predecessors, (46), 4 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) [2021-11-20 23:33:07,607 INFO L276 IsEmpty]: Start isEmpty. Operand 1729 states and 2805 transitions. [2021-11-20 23:33:07,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-20 23:33:07,610 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:33:07,610 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] [2021-11-20 23:33:07,610 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-20 23:33:07,610 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:33:07,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:33:07,611 INFO L85 PathProgramCache]: Analyzing trace with hash 2142972868, now seen corresponding path program 1 times [2021-11-20 23:33:07,611 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:33:07,612 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2088842688] [2021-11-20 23:33:07,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:33:07,612 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:33:07,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:07,744 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-20 23:33:07,745 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:33:07,745 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2088842688] [2021-11-20 23:33:07,745 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2088842688] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:33:07,745 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:33:07,746 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-20 23:33:07,746 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [861271345] [2021-11-20 23:33:07,746 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:33:07,747 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:33:07,747 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:33:07,747 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:33:07,748 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:33:07,748 INFO L87 Difference]: Start difference. First operand 1729 states and 2805 transitions. Second operand has 4 states, 4 states have (on average 11.75) internal successors, (47), 4 states have internal predecessors, (47), 4 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) [2021-11-20 23:33:09,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:33:09,018 INFO L93 Difference]: Finished difference Result 5284 states and 8689 transitions. [2021-11-20 23:33:09,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:33:09,019 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.75) internal successors, (47), 4 states have internal predecessors, (47), 4 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) Word has length 83 [2021-11-20 23:33:09,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:33:09,079 INFO L225 Difference]: With dead ends: 5284 [2021-11-20 23:33:09,079 INFO L226 Difference]: Without dead ends: 3572 [2021-11-20 23:33:09,089 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:33:09,089 INFO L933 BasicCegarLoop]: 559 mSDtfsCounter, 1131 mSDsluCounter, 412 mSDsCounter, 0 mSdLazyCounter, 686 mSolverCounterSat, 378 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1200 SdHoareTripleChecker+Valid, 947 SdHoareTripleChecker+Invalid, 1064 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 378 IncrementalHoareTripleChecker+Valid, 686 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:33:09,090 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1200 Valid, 947 Invalid, 1064 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [378 Valid, 686 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-20 23:33:09,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3572 states. [2021-11-20 23:33:09,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3572 to 3359. [2021-11-20 23:33:09,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3359 states, 2419 states have (on average 1.6188507647788342) internal successors, (3916), 2569 states have internal predecessors, (3916), 736 states have call successors, (736), 173 states have call predecessors, (736), 203 states have return successors, (838), 678 states have call predecessors, (838), 731 states have call successors, (838) [2021-11-20 23:33:09,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3359 states to 3359 states and 5490 transitions. [2021-11-20 23:33:09,406 INFO L78 Accepts]: Start accepts. Automaton has 3359 states and 5490 transitions. Word has length 83 [2021-11-20 23:33:09,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:33:09,407 INFO L470 AbstractCegarLoop]: Abstraction has 3359 states and 5490 transitions. [2021-11-20 23:33:09,407 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.75) internal successors, (47), 4 states have internal predecessors, (47), 4 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) [2021-11-20 23:33:09,407 INFO L276 IsEmpty]: Start isEmpty. Operand 3359 states and 5490 transitions. [2021-11-20 23:33:09,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-20 23:33:09,416 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:33:09,417 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] [2021-11-20 23:33:09,417 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-20 23:33:09,417 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:33:09,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:33:09,418 INFO L85 PathProgramCache]: Analyzing trace with hash 2007518629, now seen corresponding path program 1 times [2021-11-20 23:33:09,418 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:33:09,418 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [431404566] [2021-11-20 23:33:09,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:33:09,419 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:33:09,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:09,547 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-20 23:33:09,547 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:33:09,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [431404566] [2021-11-20 23:33:09,548 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [431404566] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:33:09,548 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:33:09,548 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-20 23:33:09,548 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1160120375] [2021-11-20 23:33:09,548 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:33:09,549 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:33:09,549 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:33:09,550 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:33:09,550 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:33:09,550 INFO L87 Difference]: Start difference. First operand 3359 states and 5490 transitions. Second operand has 4 states, 4 states have (on average 12.0) internal successors, (48), 4 states have internal predecessors, (48), 4 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) [2021-11-20 23:33:10,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:33:10,887 INFO L93 Difference]: Finished difference Result 10220 states and 17021 transitions. [2021-11-20 23:33:10,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:33:10,888 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.0) internal successors, (48), 4 states have internal predecessors, (48), 4 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) Word has length 84 [2021-11-20 23:33:10,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:33:10,950 INFO L225 Difference]: With dead ends: 10220 [2021-11-20 23:33:10,950 INFO L226 Difference]: Without dead ends: 6880 [2021-11-20 23:33:10,972 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:33:10,974 INFO L933 BasicCegarLoop]: 575 mSDtfsCounter, 1114 mSDsluCounter, 409 mSDsCounter, 0 mSdLazyCounter, 683 mSolverCounterSat, 378 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1182 SdHoareTripleChecker+Valid, 960 SdHoareTripleChecker+Invalid, 1061 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 378 IncrementalHoareTripleChecker+Valid, 683 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-20 23:33:10,975 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1182 Valid, 960 Invalid, 1061 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [378 Valid, 683 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-20 23:33:10,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6880 states. [2021-11-20 23:33:11,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6880 to 6564. [2021-11-20 23:33:11,489 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6564 states, 4746 states have (on average 1.619047619047619) internal successors, (7684), 5056 states have internal predecessors, (7684), 1406 states have call successors, (1406), 337 states have call predecessors, (1406), 411 states have return successors, (1744), 1284 states have call predecessors, (1744), 1401 states have call successors, (1744) [2021-11-20 23:33:11,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6564 states to 6564 states and 10834 transitions. [2021-11-20 23:33:11,530 INFO L78 Accepts]: Start accepts. Automaton has 6564 states and 10834 transitions. Word has length 84 [2021-11-20 23:33:11,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:33:11,532 INFO L470 AbstractCegarLoop]: Abstraction has 6564 states and 10834 transitions. [2021-11-20 23:33:11,532 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.0) internal successors, (48), 4 states have internal predecessors, (48), 4 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) [2021-11-20 23:33:11,532 INFO L276 IsEmpty]: Start isEmpty. Operand 6564 states and 10834 transitions. [2021-11-20 23:33:11,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2021-11-20 23:33:11,535 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:33:11,535 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] [2021-11-20 23:33:11,535 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-20 23:33:11,536 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:33:11,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:33:11,536 INFO L85 PathProgramCache]: Analyzing trace with hash 2103408422, now seen corresponding path program 1 times [2021-11-20 23:33:11,536 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:33:11,537 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [846680794] [2021-11-20 23:33:11,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:33:11,537 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:33:11,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:11,645 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-20 23:33:11,645 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:33:11,646 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [846680794] [2021-11-20 23:33:11,646 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [846680794] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:33:11,646 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:33:11,646 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-20 23:33:11,646 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1186691921] [2021-11-20 23:33:11,646 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:33:11,647 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:33:11,647 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:33:11,647 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:33:11,647 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:33:11,648 INFO L87 Difference]: Start difference. First operand 6564 states and 10834 transitions. Second operand has 4 states, 4 states have (on average 12.25) internal successors, (49), 4 states have internal predecessors, (49), 4 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) [2021-11-20 23:33:13,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:33:13,339 INFO L93 Difference]: Finished difference Result 19945 states and 33972 transitions. [2021-11-20 23:33:13,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:33:13,340 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.25) internal successors, (49), 4 states have internal predecessors, (49), 4 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) Word has length 85 [2021-11-20 23:33:13,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:33:13,477 INFO L225 Difference]: With dead ends: 19945 [2021-11-20 23:33:13,477 INFO L226 Difference]: Without dead ends: 13404 [2021-11-20 23:33:13,514 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:33:13,515 INFO L933 BasicCegarLoop]: 587 mSDtfsCounter, 1101 mSDsluCounter, 408 mSDsCounter, 0 mSdLazyCounter, 680 mSolverCounterSat, 377 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1168 SdHoareTripleChecker+Valid, 972 SdHoareTripleChecker+Invalid, 1057 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 377 IncrementalHoareTripleChecker+Valid, 680 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:33:13,516 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1168 Valid, 972 Invalid, 1057 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [377 Valid, 680 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-20 23:33:13,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13404 states. [2021-11-20 23:33:14,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13404 to 12873. [2021-11-20 23:33:14,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12873 states, 9317 states have (on average 1.616400128796823) internal successors, (15060), 9959 states have internal predecessors, (15060), 2716 states have call successors, (2716), 665 states have call predecessors, (2716), 839 states have return successors, (3854), 2466 states have call predecessors, (3854), 2711 states have call successors, (3854) [2021-11-20 23:33:14,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12873 states to 12873 states and 21630 transitions. [2021-11-20 23:33:14,823 INFO L78 Accepts]: Start accepts. Automaton has 12873 states and 21630 transitions. Word has length 85 [2021-11-20 23:33:14,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:33:14,823 INFO L470 AbstractCegarLoop]: Abstraction has 12873 states and 21630 transitions. [2021-11-20 23:33:14,824 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.25) internal successors, (49), 4 states have internal predecessors, (49), 4 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) [2021-11-20 23:33:14,825 INFO L276 IsEmpty]: Start isEmpty. Operand 12873 states and 21630 transitions. [2021-11-20 23:33:14,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2021-11-20 23:33:14,827 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:33:14,828 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] [2021-11-20 23:33:14,828 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-20 23:33:14,828 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:33:14,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:33:14,830 INFO L85 PathProgramCache]: Analyzing trace with hash 781028615, now seen corresponding path program 1 times [2021-11-20 23:33:14,830 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:33:14,830 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1969033775] [2021-11-20 23:33:14,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:33:14,830 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:33:14,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:14,950 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-20 23:33:14,950 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:33:14,950 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1969033775] [2021-11-20 23:33:14,951 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1969033775] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:33:14,951 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:33:14,951 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-20 23:33:14,951 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [117751795] [2021-11-20 23:33:14,951 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:33:14,952 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:33:14,953 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:33:14,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:33:14,954 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:33:14,954 INFO L87 Difference]: Start difference. First operand 12873 states and 21630 transitions. Second operand has 4 states, 4 states have (on average 12.5) internal successors, (50), 4 states have internal predecessors, (50), 4 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) [2021-11-20 23:33:17,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:33:17,355 INFO L93 Difference]: Finished difference Result 39186 states and 69580 transitions. [2021-11-20 23:33:17,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:33:17,356 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.5) internal successors, (50), 4 states have internal predecessors, (50), 4 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) Word has length 86 [2021-11-20 23:33:17,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:33:17,572 INFO L225 Difference]: With dead ends: 39186 [2021-11-20 23:33:17,572 INFO L226 Difference]: Without dead ends: 26334 [2021-11-20 23:33:17,651 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:33:17,652 INFO L933 BasicCegarLoop]: 598 mSDtfsCounter, 1092 mSDsluCounter, 409 mSDsCounter, 0 mSdLazyCounter, 677 mSolverCounterSat, 374 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1158 SdHoareTripleChecker+Valid, 987 SdHoareTripleChecker+Invalid, 1051 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 374 IncrementalHoareTripleChecker+Valid, 677 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:33:17,653 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1158 Valid, 987 Invalid, 1051 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [374 Valid, 677 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-20 23:33:17,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26334 states. [2021-11-20 23:33:19,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26334 to 25266. [2021-11-20 23:33:19,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25266 states, 18319 states have (on average 1.61520825372564) internal successors, (29589), 19603 states have internal predecessors, (29589), 5276 states have call successors, (5276), 1319 states have call predecessors, (5276), 1670 states have return successors, (8905), 4769 states have call predecessors, (8905), 5271 states have call successors, (8905) [2021-11-20 23:33:19,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25266 states to 25266 states and 43770 transitions. [2021-11-20 23:33:19,798 INFO L78 Accepts]: Start accepts. Automaton has 25266 states and 43770 transitions. Word has length 86 [2021-11-20 23:33:19,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:33:19,799 INFO L470 AbstractCegarLoop]: Abstraction has 25266 states and 43770 transitions. [2021-11-20 23:33:19,799 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.5) internal successors, (50), 4 states have internal predecessors, (50), 4 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) [2021-11-20 23:33:19,799 INFO L276 IsEmpty]: Start isEmpty. Operand 25266 states and 43770 transitions. [2021-11-20 23:33:19,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-20 23:33:19,807 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:33:19,807 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 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] [2021-11-20 23:33:19,808 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-20 23:33:19,808 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:33:19,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:33:19,809 INFO L85 PathProgramCache]: Analyzing trace with hash -991421385, now seen corresponding path program 1 times [2021-11-20 23:33:19,809 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:33:19,809 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1231486871] [2021-11-20 23:33:19,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:33:19,809 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:33:19,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:19,914 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 79 trivial. 0 not checked. [2021-11-20 23:33:19,914 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:33:19,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1231486871] [2021-11-20 23:33:19,915 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1231486871] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:33:19,915 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:33:19,915 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-20 23:33:19,915 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1111544829] [2021-11-20 23:33:19,915 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:33:19,916 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:33:19,916 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:33:19,917 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:33:19,917 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:33:19,917 INFO L87 Difference]: Start difference. First operand 25266 states and 43770 transitions. Second operand has 4 states, 4 states have (on average 16.25) internal successors, (65), 4 states have internal predecessors, (65), 2 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (21), 2 states have call predecessors, (21), 2 states have call successors, (21) [2021-11-20 23:33:21,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:33:21,545 INFO L93 Difference]: Finished difference Result 54175 states and 97351 transitions. [2021-11-20 23:33:21,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:33:21,546 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 16.25) internal successors, (65), 4 states have internal predecessors, (65), 2 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (21), 2 states have call predecessors, (21), 2 states have call successors, (21) Word has length 130 [2021-11-20 23:33:21,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:33:21,742 INFO L225 Difference]: With dead ends: 54175 [2021-11-20 23:33:21,742 INFO L226 Difference]: Without dead ends: 28926 [2021-11-20 23:33:21,841 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 [2021-11-20 23:33:21,844 INFO L933 BasicCegarLoop]: 600 mSDtfsCounter, 123 mSDsluCounter, 1170 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 136 SdHoareTripleChecker+Valid, 1708 SdHoareTripleChecker+Invalid, 130 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:33:21,845 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [136 Valid, 1708 Invalid, 130 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 103 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:33:21,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28926 states. [2021-11-20 23:33:23,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28926 to 25506. [2021-11-20 23:33:23,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25506 states, 18542 states have (on average 1.610344083701866) internal successors, (29859), 19810 states have internal predecessors, (29859), 5293 states have call successors, (5293), 1319 states have call predecessors, (5293), 1670 states have return successors, (8922), 4786 states have call predecessors, (8922), 5288 states have call successors, (8922) [2021-11-20 23:33:23,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25506 states to 25506 states and 44074 transitions. [2021-11-20 23:33:23,717 INFO L78 Accepts]: Start accepts. Automaton has 25506 states and 44074 transitions. Word has length 130 [2021-11-20 23:33:23,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:33:23,718 INFO L470 AbstractCegarLoop]: Abstraction has 25506 states and 44074 transitions. [2021-11-20 23:33:23,718 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 16.25) internal successors, (65), 4 states have internal predecessors, (65), 2 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (21), 2 states have call predecessors, (21), 2 states have call successors, (21) [2021-11-20 23:33:23,718 INFO L276 IsEmpty]: Start isEmpty. Operand 25506 states and 44074 transitions. [2021-11-20 23:33:23,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2021-11-20 23:33:23,725 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:33:23,725 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 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] [2021-11-20 23:33:23,725 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-20 23:33:23,726 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:33:23,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:33:23,726 INFO L85 PathProgramCache]: Analyzing trace with hash 691666656, now seen corresponding path program 1 times [2021-11-20 23:33:23,727 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:33:23,727 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1971429585] [2021-11-20 23:33:23,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:33:23,727 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:33:23,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:23,848 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2021-11-20 23:33:23,849 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:33:23,849 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1971429585] [2021-11-20 23:33:23,849 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1971429585] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:33:23,849 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1410780898] [2021-11-20 23:33:23,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:33:23,849 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:33:23,850 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:33:23,851 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:33:23,874 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 23:33:24,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:24,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 1775 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-20 23:33:24,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:33:24,630 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 44 proven. 0 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-20 23:33:24,630 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:33:24,631 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1410780898] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:33:24,631 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:33:24,631 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2021-11-20 23:33:24,631 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [315141593] [2021-11-20 23:33:24,632 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:33:24,632 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:33:24,632 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:33:24,634 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:33:24,634 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:33:24,634 INFO L87 Difference]: Start difference. First operand 25506 states and 44074 transitions. Second operand has 4 states, 4 states have (on average 18.5) internal successors, (74), 4 states have internal predecessors, (74), 2 states have call successors, (23), 2 states have call predecessors, (23), 3 states have return successors, (22), 2 states have call predecessors, (22), 2 states have call successors, (22) [2021-11-20 23:33:26,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:33:26,529 INFO L93 Difference]: Finished difference Result 53491 states and 95734 transitions. [2021-11-20 23:33:26,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:33:26,529 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.5) internal successors, (74), 4 states have internal predecessors, (74), 2 states have call successors, (23), 2 states have call predecessors, (23), 3 states have return successors, (22), 2 states have call predecessors, (22), 2 states have call successors, (22) Word has length 133 [2021-11-20 23:33:26,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:33:26,803 INFO L225 Difference]: With dead ends: 53491 [2021-11-20 23:33:26,804 INFO L226 Difference]: Without dead ends: 28002 [2021-11-20 23:33:26,883 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 133 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-20 23:33:26,884 INFO L933 BasicCegarLoop]: 478 mSDtfsCounter, 213 mSDsluCounter, 994 mSDsCounter, 0 mSdLazyCounter, 239 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 213 SdHoareTripleChecker+Valid, 1410 SdHoareTripleChecker+Invalid, 248 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 239 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:33:26,884 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [213 Valid, 1410 Invalid, 248 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 239 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:33:26,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28002 states. [2021-11-20 23:33:28,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28002 to 28002. [2021-11-20 23:33:28,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28002 states, 20974 states have (on average 1.646371698293125) internal successors, (34531), 22242 states have internal predecessors, (34531), 5293 states have call successors, (5293), 1383 states have call predecessors, (5293), 1734 states have return successors, (8922), 4786 states have call predecessors, (8922), 5288 states have call successors, (8922) [2021-11-20 23:33:28,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28002 states to 28002 states and 48746 transitions. [2021-11-20 23:33:28,726 INFO L78 Accepts]: Start accepts. Automaton has 28002 states and 48746 transitions. Word has length 133 [2021-11-20 23:33:28,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:33:28,727 INFO L470 AbstractCegarLoop]: Abstraction has 28002 states and 48746 transitions. [2021-11-20 23:33:28,727 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.5) internal successors, (74), 4 states have internal predecessors, (74), 2 states have call successors, (23), 2 states have call predecessors, (23), 3 states have return successors, (22), 2 states have call predecessors, (22), 2 states have call successors, (22) [2021-11-20 23:33:28,728 INFO L276 IsEmpty]: Start isEmpty. Operand 28002 states and 48746 transitions. [2021-11-20 23:33:28,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2021-11-20 23:33:28,735 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:33:28,735 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 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] [2021-11-20 23:33:28,776 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-20 23:33:28,959 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-20 23:33:28,960 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:33:28,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:33:28,960 INFO L85 PathProgramCache]: Analyzing trace with hash 534073228, now seen corresponding path program 1 times [2021-11-20 23:33:28,960 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:33:28,960 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1248847083] [2021-11-20 23:33:28,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:33:28,961 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:33:29,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:29,064 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 9 proven. 15 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2021-11-20 23:33:29,064 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:33:29,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1248847083] [2021-11-20 23:33:29,065 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1248847083] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:33:29,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [512505290] [2021-11-20 23:33:29,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:33:29,065 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:33:29,065 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:33:29,066 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:33:29,095 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-20 23:33:29,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:29,439 INFO L263 TraceCheckSpWp]: Trace formula consists of 1780 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-20 23:33:29,454 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:33:29,731 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 60 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-20 23:33:29,731 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:33:29,731 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [512505290] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:33:29,731 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:33:29,732 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2021-11-20 23:33:29,732 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [414046453] [2021-11-20 23:33:29,732 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:33:29,733 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:33:29,733 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:33:29,733 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:33:29,733 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:33:29,734 INFO L87 Difference]: Start difference. First operand 28002 states and 48746 transitions. Second operand has 4 states, 4 states have (on average 19.5) internal successors, (78), 4 states have internal predecessors, (78), 2 states have call successors, (23), 2 states have call predecessors, (23), 3 states have return successors, (22), 2 states have call predecessors, (22), 2 states have call successors, (22) [2021-11-20 23:33:31,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:33:31,193 INFO L93 Difference]: Finished difference Result 58483 states and 105012 transitions. [2021-11-20 23:33:31,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:33:31,193 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 19.5) internal successors, (78), 4 states have internal predecessors, (78), 2 states have call successors, (23), 2 states have call predecessors, (23), 3 states have return successors, (22), 2 states have call predecessors, (22), 2 states have call successors, (22) Word has length 138 [2021-11-20 23:33:31,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:33:31,341 INFO L225 Difference]: With dead ends: 58483 [2021-11-20 23:33:31,341 INFO L226 Difference]: Without dead ends: 30498 [2021-11-20 23:33:31,447 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-20 23:33:31,448 INFO L933 BasicCegarLoop]: 478 mSDtfsCounter, 211 mSDsluCounter, 994 mSDsCounter, 0 mSdLazyCounter, 233 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 211 SdHoareTripleChecker+Valid, 1410 SdHoareTripleChecker+Invalid, 247 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 233 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:33:31,448 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [211 Valid, 1410 Invalid, 247 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 233 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:33:31,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30498 states. [2021-11-20 23:33:32,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30498 to 30498. [2021-11-20 23:33:32,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30498 states, 23406 states have (on average 1.6749124156199264) internal successors, (39203), 24674 states have internal predecessors, (39203), 5293 states have call successors, (5293), 1447 states have call predecessors, (5293), 1798 states have return successors, (8922), 4786 states have call predecessors, (8922), 5288 states have call successors, (8922) [2021-11-20 23:33:33,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30498 states to 30498 states and 53418 transitions. [2021-11-20 23:33:33,055 INFO L78 Accepts]: Start accepts. Automaton has 30498 states and 53418 transitions. Word has length 138 [2021-11-20 23:33:33,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:33:33,056 INFO L470 AbstractCegarLoop]: Abstraction has 30498 states and 53418 transitions. [2021-11-20 23:33:33,056 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 19.5) internal successors, (78), 4 states have internal predecessors, (78), 2 states have call successors, (23), 2 states have call predecessors, (23), 3 states have return successors, (22), 2 states have call predecessors, (22), 2 states have call successors, (22) [2021-11-20 23:33:33,056 INFO L276 IsEmpty]: Start isEmpty. Operand 30498 states and 53418 transitions. [2021-11-20 23:33:33,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2021-11-20 23:33:33,094 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:33:33,094 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 4, 4, 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] [2021-11-20 23:33:33,121 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-20 23:33:33,302 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:33:33,303 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:33:33,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:33:33,303 INFO L85 PathProgramCache]: Analyzing trace with hash 373862348, now seen corresponding path program 1 times [2021-11-20 23:33:33,303 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:33:33,304 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [187120838] [2021-11-20 23:33:33,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:33:33,304 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:33:33,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:33,406 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 15 proven. 12 refuted. 0 times theorem prover too weak. 68 trivial. 0 not checked. [2021-11-20 23:33:33,407 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:33:33,407 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [187120838] [2021-11-20 23:33:33,407 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [187120838] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:33:33,407 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [895024328] [2021-11-20 23:33:33,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:33:33,408 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:33:33,408 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:33:33,409 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:33:33,432 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-20 23:33:33,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:33,770 INFO L263 TraceCheckSpWp]: Trace formula consists of 1784 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-20 23:33:33,776 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:33:34,085 INFO L134 CoverageAnalysis]: Checked inductivity of 95 backedges. 65 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-20 23:33:34,085 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:33:34,086 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [895024328] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:33:34,086 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:33:34,086 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2021-11-20 23:33:34,086 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1422882368] [2021-11-20 23:33:34,087 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:33:34,087 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:33:34,087 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:33:34,088 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:33:34,088 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:33:34,088 INFO L87 Difference]: Start difference. First operand 30498 states and 53418 transitions. Second operand has 4 states, 4 states have (on average 20.5) internal successors, (82), 4 states have internal predecessors, (82), 2 states have call successors, (23), 2 states have call predecessors, (23), 3 states have return successors, (22), 2 states have call predecessors, (22), 2 states have call successors, (22) [2021-11-20 23:33:35,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:33:35,521 INFO L93 Difference]: Finished difference Result 63475 states and 114290 transitions. [2021-11-20 23:33:35,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:33:35,522 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 20.5) internal successors, (82), 4 states have internal predecessors, (82), 2 states have call successors, (23), 2 states have call predecessors, (23), 3 states have return successors, (22), 2 states have call predecessors, (22), 2 states have call successors, (22) Word has length 142 [2021-11-20 23:33:35,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:33:35,831 INFO L225 Difference]: With dead ends: 63475 [2021-11-20 23:33:35,831 INFO L226 Difference]: Without dead ends: 32994 [2021-11-20 23:33:35,913 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-20 23:33:35,914 INFO L933 BasicCegarLoop]: 478 mSDtfsCounter, 209 mSDsluCounter, 994 mSDsCounter, 0 mSdLazyCounter, 227 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 209 SdHoareTripleChecker+Valid, 1410 SdHoareTripleChecker+Invalid, 246 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 227 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:33:35,914 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [209 Valid, 1410 Invalid, 246 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 227 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:33:35,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32994 states. [2021-11-20 23:33:37,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32994 to 32994. [2021-11-20 23:33:37,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32994 states, 25838 states have (on average 1.6980803467760663) internal successors, (43875), 27106 states have internal predecessors, (43875), 5293 states have call successors, (5293), 1511 states have call predecessors, (5293), 1862 states have return successors, (8922), 4786 states have call predecessors, (8922), 5288 states have call successors, (8922) [2021-11-20 23:33:37,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32994 states to 32994 states and 58090 transitions. [2021-11-20 23:33:37,421 INFO L78 Accepts]: Start accepts. Automaton has 32994 states and 58090 transitions. Word has length 142 [2021-11-20 23:33:37,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:33:37,421 INFO L470 AbstractCegarLoop]: Abstraction has 32994 states and 58090 transitions. [2021-11-20 23:33:37,422 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 20.5) internal successors, (82), 4 states have internal predecessors, (82), 2 states have call successors, (23), 2 states have call predecessors, (23), 3 states have return successors, (22), 2 states have call predecessors, (22), 2 states have call successors, (22) [2021-11-20 23:33:37,422 INFO L276 IsEmpty]: Start isEmpty. Operand 32994 states and 58090 transitions. [2021-11-20 23:33:37,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-20 23:33:37,430 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:33:37,430 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 4, 3, 3, 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] [2021-11-20 23:33:37,467 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-11-20 23:33:37,643 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:33:37,644 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:33:37,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:33:37,644 INFO L85 PathProgramCache]: Analyzing trace with hash -1186874624, now seen corresponding path program 1 times [2021-11-20 23:33:37,644 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:33:37,644 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [928438500] [2021-11-20 23:33:37,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:33:37,645 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:33:37,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:38,266 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 2 proven. 40 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-20 23:33:38,266 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:33:38,266 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [928438500] [2021-11-20 23:33:38,266 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [928438500] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:33:38,266 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [838941917] [2021-11-20 23:33:38,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:33:38,267 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:33:38,267 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:33:38,268 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:33:38,291 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-20 23:33:38,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:38,621 INFO L263 TraceCheckSpWp]: Trace formula consists of 1787 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-20 23:33:38,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:33:38,939 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 58 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-20 23:33:38,940 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:33:38,940 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [838941917] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:33:38,940 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:33:38,940 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [26] total 28 [2021-11-20 23:33:38,943 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [818233452] [2021-11-20 23:33:38,944 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:33:38,944 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:33:38,944 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:33:38,945 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:33:38,945 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=667, Unknown=0, NotChecked=0, Total=756 [2021-11-20 23:33:38,946 INFO L87 Difference]: Start difference. First operand 32994 states and 58090 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, (23), 2 states have call predecessors, (23), 3 states have return successors, (22), 2 states have call predecessors, (22), 2 states have call successors, (22) [2021-11-20 23:33:40,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:33:40,544 INFO L93 Difference]: Finished difference Result 68467 states and 123568 transitions. [2021-11-20 23:33:40,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:33:40,544 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, (23), 2 states have call predecessors, (23), 3 states have return successors, (22), 2 states have call predecessors, (22), 2 states have call successors, (22) Word has length 145 [2021-11-20 23:33:40,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:33:40,886 INFO L225 Difference]: With dead ends: 68467 [2021-11-20 23:33:40,887 INFO L226 Difference]: Without dead ends: 35490 [2021-11-20 23:33:40,953 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 203 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=93, Invalid=719, Unknown=0, NotChecked=0, Total=812 [2021-11-20 23:33:40,953 INFO L933 BasicCegarLoop]: 478 mSDtfsCounter, 207 mSDsluCounter, 994 mSDsCounter, 0 mSdLazyCounter, 221 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 207 SdHoareTripleChecker+Valid, 1410 SdHoareTripleChecker+Invalid, 245 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 221 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:33:40,954 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [207 Valid, 1410 Invalid, 245 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 221 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:33:40,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35490 states. [2021-11-20 23:33:42,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35490 to 35490. [2021-11-20 23:33:42,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35490 states, 28270 states have (on average 1.7172621153165901) internal successors, (48547), 29538 states have internal predecessors, (48547), 5293 states have call successors, (5293), 1575 states have call predecessors, (5293), 1926 states have return successors, (8922), 4786 states have call predecessors, (8922), 5288 states have call successors, (8922) [2021-11-20 23:33:42,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35490 states to 35490 states and 62762 transitions. [2021-11-20 23:33:42,200 INFO L78 Accepts]: Start accepts. Automaton has 35490 states and 62762 transitions. Word has length 145 [2021-11-20 23:33:42,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:33:42,201 INFO L470 AbstractCegarLoop]: Abstraction has 35490 states and 62762 transitions. [2021-11-20 23:33:42,201 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, (23), 2 states have call predecessors, (23), 3 states have return successors, (22), 2 states have call predecessors, (22), 2 states have call successors, (22) [2021-11-20 23:33:42,201 INFO L276 IsEmpty]: Start isEmpty. Operand 35490 states and 62762 transitions. [2021-11-20 23:33:42,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-11-20 23:33:42,208 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:33:42,209 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 4, 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] [2021-11-20 23:33:42,235 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2021-11-20 23:33:42,418 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-20 23:33:42,419 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:33:42,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:33:42,419 INFO L85 PathProgramCache]: Analyzing trace with hash 1653615918, now seen corresponding path program 1 times [2021-11-20 23:33:42,419 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:33:42,419 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1812142448] [2021-11-20 23:33:42,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:33:42,420 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:33:42,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:43,175 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 2 proven. 36 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2021-11-20 23:33:43,175 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:33:43,175 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1812142448] [2021-11-20 23:33:43,175 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1812142448] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:33:43,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2017765996] [2021-11-20 23:33:43,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:33:43,176 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:33:43,176 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:33:43,180 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:33:43,199 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-20 23:33:43,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:43,487 INFO L263 TraceCheckSpWp]: Trace formula consists of 1783 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-20 23:33:43,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:33:43,852 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 79 trivial. 0 not checked. [2021-11-20 23:33:43,852 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:33:43,852 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2017765996] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:33:43,852 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:33:43,853 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [26] total 29 [2021-11-20 23:33:43,853 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1757819694] [2021-11-20 23:33:43,853 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:33:43,854 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:33:43,854 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:33:43,855 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:33:43,855 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=719, Unknown=0, NotChecked=0, Total=812 [2021-11-20 23:33:43,855 INFO L87 Difference]: Start difference. First operand 35490 states and 62762 transitions. Second operand has 5 states, 5 states have (on average 15.6) internal successors, (78), 4 states have internal predecessors, (78), 2 states have call successors, (23), 2 states have call predecessors, (23), 2 states have return successors, (22), 2 states have call predecessors, (22), 1 states have call successors, (22) [2021-11-20 23:33:45,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:33:45,242 INFO L93 Difference]: Finished difference Result 36631 states and 66190 transitions. [2021-11-20 23:33:45,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:33:45,242 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 15.6) internal successors, (78), 4 states have internal predecessors, (78), 2 states have call successors, (23), 2 states have call predecessors, (23), 2 states have return successors, (22), 2 states have call predecessors, (22), 1 states have call successors, (22) Word has length 147 [2021-11-20 23:33:45,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:33:45,436 INFO L225 Difference]: With dead ends: 36631 [2021-11-20 23:33:45,436 INFO L226 Difference]: Without dead ends: 36474 [2021-11-20 23:33:45,457 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 205 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=93, Invalid=719, Unknown=0, NotChecked=0, Total=812 [2021-11-20 23:33:45,458 INFO L933 BasicCegarLoop]: 543 mSDtfsCounter, 558 mSDsluCounter, 386 mSDsCounter, 0 mSdLazyCounter, 259 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 566 SdHoareTripleChecker+Valid, 900 SdHoareTripleChecker+Invalid, 274 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 259 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:33:45,458 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [566 Valid, 900 Invalid, 274 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 259 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:33:45,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36474 states. [2021-11-20 23:33:46,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36474 to 35552. [2021-11-20 23:33:46,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35552 states, 28332 states have (on average 1.7156925031766201) internal successors, (48609), 29600 states have internal predecessors, (48609), 5293 states have call successors, (5293), 1575 states have call predecessors, (5293), 1926 states have return successors, (8922), 4786 states have call predecessors, (8922), 5288 states have call successors, (8922) [2021-11-20 23:33:47,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35552 states to 35552 states and 62824 transitions. [2021-11-20 23:33:47,085 INFO L78 Accepts]: Start accepts. Automaton has 35552 states and 62824 transitions. Word has length 147 [2021-11-20 23:33:47,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:33:47,086 INFO L470 AbstractCegarLoop]: Abstraction has 35552 states and 62824 transitions. [2021-11-20 23:33:47,086 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 15.6) internal successors, (78), 4 states have internal predecessors, (78), 2 states have call successors, (23), 2 states have call predecessors, (23), 2 states have return successors, (22), 2 states have call predecessors, (22), 1 states have call successors, (22) [2021-11-20 23:33:47,086 INFO L276 IsEmpty]: Start isEmpty. Operand 35552 states and 62824 transitions. [2021-11-20 23:33:47,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2021-11-20 23:33:47,095 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:33:47,095 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 4, 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] [2021-11-20 23:33:47,131 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-11-20 23:33:47,311 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-20 23:33:47,312 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:33:47,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:33:47,312 INFO L85 PathProgramCache]: Analyzing trace with hash 1836606761, now seen corresponding path program 1 times [2021-11-20 23:33:47,312 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:33:47,312 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1649583178] [2021-11-20 23:33:47,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:33:47,313 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:33:47,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:47,916 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 2 proven. 36 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2021-11-20 23:33:47,916 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:33:47,916 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1649583178] [2021-11-20 23:33:47,916 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1649583178] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:33:47,916 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1772659367] [2021-11-20 23:33:47,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:33:47,916 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:33:47,917 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:33:47,918 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:33:47,937 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-20 23:33:48,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:48,240 INFO L263 TraceCheckSpWp]: Trace formula consists of 1798 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-20 23:33:48,245 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:33:48,497 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 79 trivial. 0 not checked. [2021-11-20 23:33:48,497 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:33:48,498 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1772659367] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:33:48,498 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:33:48,498 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [26] total 29 [2021-11-20 23:33:48,498 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1948957491] [2021-11-20 23:33:48,499 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:33:48,500 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:33:48,500 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:33:48,500 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:33:48,501 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=722, Unknown=0, NotChecked=0, Total=812 [2021-11-20 23:33:48,501 INFO L87 Difference]: Start difference. First operand 35552 states and 62824 transitions. Second operand has 5 states, 4 states have (on average 20.25) internal successors, (81), 4 states have internal predecessors, (81), 2 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (23), 3 states have call predecessors, (23), 1 states have call successors, (23) [2021-11-20 23:33:49,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:33:49,540 INFO L93 Difference]: Finished difference Result 35779 states and 63109 transitions. [2021-11-20 23:33:49,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-20 23:33:49,541 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 20.25) internal successors, (81), 4 states have internal predecessors, (81), 2 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (23), 3 states have call predecessors, (23), 1 states have call successors, (23) Word has length 152 [2021-11-20 23:33:49,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:33:49,645 INFO L225 Difference]: With dead ends: 35779 [2021-11-20 23:33:49,645 INFO L226 Difference]: Without dead ends: 35622 [2021-11-20 23:33:49,661 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 217 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=94, Invalid=776, Unknown=0, NotChecked=0, Total=870 [2021-11-20 23:33:49,662 INFO L933 BasicCegarLoop]: 546 mSDtfsCounter, 30 mSDsluCounter, 1691 mSDsCounter, 0 mSdLazyCounter, 130 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 2148 SdHoareTripleChecker+Invalid, 130 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 130 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:33:49,662 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 2148 Invalid, 130 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 130 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:33:49,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35622 states. [2021-11-20 23:33:51,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35622 to 35552. [2021-11-20 23:33:51,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35552 states, 28332 states have (on average 1.7135041649018776) internal successors, (48547), 29600 states have internal predecessors, (48547), 5293 states have call successors, (5293), 1575 states have call predecessors, (5293), 1926 states have return successors, (8922), 4786 states have call predecessors, (8922), 5288 states have call successors, (8922) [2021-11-20 23:33:51,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35552 states to 35552 states and 62762 transitions. [2021-11-20 23:33:51,271 INFO L78 Accepts]: Start accepts. Automaton has 35552 states and 62762 transitions. Word has length 152 [2021-11-20 23:33:51,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:33:51,271 INFO L470 AbstractCegarLoop]: Abstraction has 35552 states and 62762 transitions. [2021-11-20 23:33:51,272 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 20.25) internal successors, (81), 4 states have internal predecessors, (81), 2 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (23), 3 states have call predecessors, (23), 1 states have call successors, (23) [2021-11-20 23:33:51,272 INFO L276 IsEmpty]: Start isEmpty. Operand 35552 states and 62762 transitions. [2021-11-20 23:33:51,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-11-20 23:33:51,281 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:33:51,281 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 4, 3, 3, 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] [2021-11-20 23:33:51,321 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-20 23:33:51,507 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:33:51,508 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:33:51,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:33:51,508 INFO L85 PathProgramCache]: Analyzing trace with hash 729561048, now seen corresponding path program 1 times [2021-11-20 23:33:51,508 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:33:51,508 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [177272247] [2021-11-20 23:33:51,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:33:51,509 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:33:51,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:52,095 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 2 proven. 36 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-20 23:33:52,096 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:33:52,096 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [177272247] [2021-11-20 23:33:52,096 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [177272247] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:33:52,096 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [352588188] [2021-11-20 23:33:52,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:33:52,096 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:33:52,096 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:33:52,100 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:33:52,124 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-20 23:33:52,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:52,412 INFO L263 TraceCheckSpWp]: Trace formula consists of 1828 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-20 23:33:52,416 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:33:52,714 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2021-11-20 23:33:52,714 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:33:52,715 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [352588188] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:33:52,715 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:33:52,715 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [26] total 28 [2021-11-20 23:33:52,715 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [967265020] [2021-11-20 23:33:52,715 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:33:52,715 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:33:52,716 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:33:52,716 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:33:52,716 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=668, Unknown=0, NotChecked=0, Total=756 [2021-11-20 23:33:52,717 INFO L87 Difference]: Start difference. First operand 35552 states and 62762 transitions. Second operand has 4 states, 4 states have (on average 21.25) internal successors, (85), 4 states have internal predecessors, (85), 2 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (24), 2 states have call predecessors, (24), 1 states have call successors, (24) [2021-11-20 23:33:53,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:33:53,813 INFO L93 Difference]: Finished difference Result 37172 states and 68405 transitions. [2021-11-20 23:33:53,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:33:53,813 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 21.25) internal successors, (85), 4 states have internal predecessors, (85), 2 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (24), 2 states have call predecessors, (24), 1 states have call successors, (24) Word has length 159 [2021-11-20 23:33:53,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:33:53,971 INFO L225 Difference]: With dead ends: 37172 [2021-11-20 23:33:53,971 INFO L226 Difference]: Without dead ends: 37015 [2021-11-20 23:33:53,992 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 162 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 202 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=92, Invalid=720, Unknown=0, NotChecked=0, Total=812 [2021-11-20 23:33:53,992 INFO L933 BasicCegarLoop]: 581 mSDtfsCounter, 44 mSDsluCounter, 1168 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 1690 SdHoareTripleChecker+Invalid, 117 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:33:53,993 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [51 Valid, 1690 Invalid, 117 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 105 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:33:54,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37015 states. [2021-11-20 23:33:55,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37015 to 35676. [2021-11-20 23:33:55,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35676 states, 28456 states have (on average 1.7103949957829632) internal successors, (48671), 29724 states have internal predecessors, (48671), 5293 states have call successors, (5293), 1575 states have call predecessors, (5293), 1926 states have return successors, (8922), 4786 states have call predecessors, (8922), 5288 states have call successors, (8922) [2021-11-20 23:33:55,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35676 states to 35676 states and 62886 transitions. [2021-11-20 23:33:55,699 INFO L78 Accepts]: Start accepts. Automaton has 35676 states and 62886 transitions. Word has length 159 [2021-11-20 23:33:55,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:33:55,700 INFO L470 AbstractCegarLoop]: Abstraction has 35676 states and 62886 transitions. [2021-11-20 23:33:55,700 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 21.25) internal successors, (85), 4 states have internal predecessors, (85), 2 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (24), 2 states have call predecessors, (24), 1 states have call successors, (24) [2021-11-20 23:33:55,700 INFO L276 IsEmpty]: Start isEmpty. Operand 35676 states and 62886 transitions. [2021-11-20 23:33:55,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2021-11-20 23:33:55,720 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:33:55,721 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 4, 3, 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] [2021-11-20 23:33:55,757 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-20 23:33:55,947 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-20 23:33:55,948 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:33:55,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:33:55,948 INFO L85 PathProgramCache]: Analyzing trace with hash 2013078306, now seen corresponding path program 1 times [2021-11-20 23:33:55,948 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:33:55,949 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1750140825] [2021-11-20 23:33:55,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:33:55,949 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:33:56,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:56,518 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 2 proven. 36 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-11-20 23:33:56,518 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:33:56,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1750140825] [2021-11-20 23:33:56,519 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1750140825] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:33:56,519 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [545854509] [2021-11-20 23:33:56,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:33:56,519 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:33:56,519 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:33:56,520 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:33:56,539 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_844efb62-3ee9-4047-bb19-2d5a99ad16e8/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-20 23:33:56,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:33:56,854 INFO L263 TraceCheckSpWp]: Trace formula consists of 1892 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-20 23:33:56,860 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:33:58,234 INFO L134 CoverageAnalysis]: Checked inductivity of 119 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2021-11-20 23:33:58,236 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:34:00,798 WARN L176 XnfTransformerHelper]: Simplifying conjuction of 9813 disjunctions. This might take some time... [2021-11-20 23:34:07,273 INFO L192 XnfTransformerHelper]: Simplified to conjuction of 9813 disjunctions. [2021-11-20 23:34:07,665 WARN L176 XnfTransformerHelper]: Simplifying conjuction of 9813 disjunctions. This might take some time...