./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/elevator_spec3_product01.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_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/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_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/elevator_spec3_product01.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/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_e0372017-af22-43c9-8e38-f91363ca6a57/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 2e63e44256bba8522bf99795cd1238c2e8ad8456659e8a545df838f8f88bd318 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 01:06:34,570 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 01:06:34,573 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 01:06:34,629 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 01:06:34,629 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 01:06:34,634 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 01:06:34,636 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 01:06:34,640 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 01:06:34,643 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 01:06:34,651 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 01:06:34,652 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 01:06:34,654 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 01:06:34,654 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 01:06:34,657 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 01:06:34,659 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 01:06:34,665 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 01:06:34,667 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 01:06:34,668 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 01:06:34,670 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 01:06:34,680 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 01:06:34,682 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 01:06:34,684 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 01:06:34,688 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 01:06:34,689 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 01:06:34,693 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 01:06:34,694 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 01:06:34,694 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 01:06:34,696 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 01:06:34,697 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 01:06:34,698 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 01:06:34,699 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 01:06:34,700 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 01:06:34,702 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 01:06:34,703 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 01:06:34,704 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 01:06:34,705 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 01:06:34,705 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 01:06:34,706 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 01:06:34,706 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 01:06:34,707 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 01:06:34,707 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 01:06:34,708 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 01:06:34,753 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 01:06:34,754 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 01:06:34,754 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 01:06:34,755 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 01:06:34,756 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 01:06:34,763 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 01:06:34,763 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 01:06:34,764 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 01:06:34,764 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 01:06:34,764 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 01:06:34,765 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 01:06:34,766 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 01:06:34,766 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 01:06:34,766 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 01:06:34,766 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 01:06:34,767 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 01:06:34,767 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 01:06:34,767 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 01:06:34,768 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 01:06:34,768 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 01:06:34,768 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 01:06:34,769 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 01:06:34,769 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 01:06:34,769 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 01:06:34,769 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 01:06:34,769 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 01:06:34,770 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 01:06:34,770 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 01:06:34,770 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 01:06:34,770 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 01:06:34,771 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 01:06:34,771 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 01:06:34,771 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:06:34,772 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 01:06:34,772 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 01:06:34,772 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 01:06:34,772 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 01:06:34,772 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 01:06:34,773 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 01:06:34,773 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 01:06:34,773 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 01:06:34,773 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_e0372017-af22-43c9-8e38-f91363ca6a57/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2e63e44256bba8522bf99795cd1238c2e8ad8456659e8a545df838f8f88bd318 [2021-11-21 01:06:35,049 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 01:06:35,073 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 01:06:35,076 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 01:06:35,078 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 01:06:35,079 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 01:06:35,080 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/product-lines/elevator_spec3_product01.cil.c [2021-11-21 01:06:35,171 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/data/6f0171fe6/f3123df71b3e47c4aa2eccb8954aa458/FLAG08e9e833d [2021-11-21 01:06:35,812 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 01:06:35,812 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/sv-benchmarks/c/product-lines/elevator_spec3_product01.cil.c [2021-11-21 01:06:35,833 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/data/6f0171fe6/f3123df71b3e47c4aa2eccb8954aa458/FLAG08e9e833d [2021-11-21 01:06:35,988 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/data/6f0171fe6/f3123df71b3e47c4aa2eccb8954aa458 [2021-11-21 01:06:35,991 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 01:06:35,993 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 01:06:35,994 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 01:06:35,995 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 01:06:35,998 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 01:06:35,999 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:06:35" (1/1) ... [2021-11-21 01:06:36,002 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7b95095d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:06:36, skipping insertion in model container [2021-11-21 01:06:36,002 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:06:35" (1/1) ... [2021-11-21 01:06:36,011 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 01:06:36,084 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 01:06:36,560 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_e0372017-af22-43c9-8e38-f91363ca6a57/sv-benchmarks/c/product-lines/elevator_spec3_product01.cil.c[40412,40425] [2021-11-21 01:06:36,710 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:06:36,720 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 01:06:36,823 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_e0372017-af22-43c9-8e38-f91363ca6a57/sv-benchmarks/c/product-lines/elevator_spec3_product01.cil.c[40412,40425] [2021-11-21 01:06:36,863 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:06:36,899 INFO L208 MainTranslator]: Completed translation [2021-11-21 01:06:36,900 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:06:36 WrapperNode [2021-11-21 01:06:36,900 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 01:06:36,901 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 01:06:36,901 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 01:06:36,901 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 01:06:36,907 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:06:36" (1/1) ... [2021-11-21 01:06:36,941 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:06:36" (1/1) ... [2021-11-21 01:06:37,015 INFO L137 Inliner]: procedures = 86, calls = 334, calls flagged for inlining = 21, calls inlined = 18, statements flattened = 750 [2021-11-21 01:06:37,025 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 01:06:37,026 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 01:06:37,026 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 01:06:37,026 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 01:06:37,035 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:06:36" (1/1) ... [2021-11-21 01:06:37,035 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:06:36" (1/1) ... [2021-11-21 01:06:37,043 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:06:36" (1/1) ... [2021-11-21 01:06:37,044 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:06:36" (1/1) ... [2021-11-21 01:06:37,064 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:06:36" (1/1) ... [2021-11-21 01:06:37,080 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:06:36" (1/1) ... [2021-11-21 01:06:37,085 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:06:36" (1/1) ... [2021-11-21 01:06:37,093 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 01:06:37,094 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 01:06:37,095 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 01:06:37,095 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 01:06:37,110 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:06:36" (1/1) ... [2021-11-21 01:06:37,117 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:06:37,146 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:06:37,166 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 01:06:37,181 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 01:06:37,221 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 01:06:37,223 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentHeading [2021-11-21 01:06:37,223 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentHeading [2021-11-21 01:06:37,223 INFO L130 BoogieDeclarations]: Found specification of procedure enterElevator [2021-11-21 01:06:37,223 INFO L138 BoogieDeclarations]: Found implementation of procedure enterElevator [2021-11-21 01:06:37,223 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection [2021-11-21 01:06:37,224 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection [2021-11-21 01:06:37,224 INFO L130 BoogieDeclarations]: Found specification of procedure bobCall [2021-11-21 01:06:37,224 INFO L138 BoogieDeclarations]: Found implementation of procedure bobCall [2021-11-21 01:06:37,224 INFO L130 BoogieDeclarations]: Found specification of procedure getReverseHeading [2021-11-21 01:06:37,224 INFO L138 BoogieDeclarations]: Found implementation of procedure getReverseHeading [2021-11-21 01:06:37,224 INFO L130 BoogieDeclarations]: Found specification of procedure cleanup [2021-11-21 01:06:37,224 INFO L138 BoogieDeclarations]: Found implementation of procedure cleanup [2021-11-21 01:06:37,224 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift [2021-11-21 01:06:37,225 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift [2021-11-21 01:06:37,225 INFO L130 BoogieDeclarations]: Found specification of procedure __automaton_fail [2021-11-21 01:06:37,225 INFO L138 BoogieDeclarations]: Found implementation of procedure __automaton_fail [2021-11-21 01:06:37,225 INFO L130 BoogieDeclarations]: Found specification of procedure isTopFloor [2021-11-21 01:06:37,225 INFO L138 BoogieDeclarations]: Found implementation of procedure isTopFloor [2021-11-21 01:06:37,225 INFO L130 BoogieDeclarations]: Found specification of procedure getDestination [2021-11-21 01:06:37,225 INFO L138 BoogieDeclarations]: Found implementation of procedure getDestination [2021-11-21 01:06:37,225 INFO L130 BoogieDeclarations]: Found specification of procedure isBlocked [2021-11-21 01:06:37,226 INFO L138 BoogieDeclarations]: Found implementation of procedure isBlocked [2021-11-21 01:06:37,226 INFO L130 BoogieDeclarations]: Found specification of procedure initTopDown [2021-11-21 01:06:37,226 INFO L138 BoogieDeclarations]: Found implementation of procedure initTopDown [2021-11-21 01:06:37,226 INFO L130 BoogieDeclarations]: Found specification of procedure resetCallOnFloor [2021-11-21 01:06:37,226 INFO L138 BoogieDeclarations]: Found implementation of procedure resetCallOnFloor [2021-11-21 01:06:37,227 INFO L130 BoogieDeclarations]: Found specification of procedure initFloors [2021-11-21 01:06:37,227 INFO L138 BoogieDeclarations]: Found implementation of procedure initFloors [2021-11-21 01:06:37,227 INFO L130 BoogieDeclarations]: Found specification of procedure initPersonOnFloor [2021-11-21 01:06:37,227 INFO L138 BoogieDeclarations]: Found implementation of procedure initPersonOnFloor [2021-11-21 01:06:37,227 INFO L130 BoogieDeclarations]: Found specification of procedure removePersonFromFloor [2021-11-21 01:06:37,227 INFO L138 BoogieDeclarations]: Found implementation of procedure removePersonFromFloor [2021-11-21 01:06:37,227 INFO L130 BoogieDeclarations]: Found specification of procedure getOrigin [2021-11-21 01:06:37,227 INFO L138 BoogieDeclarations]: Found implementation of procedure getOrigin [2021-11-21 01:06:37,228 INFO L130 BoogieDeclarations]: Found specification of procedure continueInDirection [2021-11-21 01:06:37,228 INFO L138 BoogieDeclarations]: Found implementation of procedure continueInDirection [2021-11-21 01:06:37,228 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 01:06:37,228 INFO L130 BoogieDeclarations]: Found specification of procedure buttonForFloorIsPressed [2021-11-21 01:06:37,228 INFO L138 BoogieDeclarations]: Found implementation of procedure buttonForFloorIsPressed [2021-11-21 01:06:37,228 INFO L130 BoogieDeclarations]: Found specification of procedure pressInLiftFloorButton [2021-11-21 01:06:37,228 INFO L138 BoogieDeclarations]: Found implementation of procedure pressInLiftFloorButton [2021-11-21 01:06:37,228 INFO L130 BoogieDeclarations]: Found specification of procedure leaveElevator [2021-11-21 01:06:37,229 INFO L138 BoogieDeclarations]: Found implementation of procedure leaveElevator [2021-11-21 01:06:37,229 INFO L130 BoogieDeclarations]: Found specification of procedure isPersonOnFloor [2021-11-21 01:06:37,229 INFO L138 BoogieDeclarations]: Found implementation of procedure isPersonOnFloor [2021-11-21 01:06:37,230 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 01:06:37,231 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 01:06:37,231 INFO L130 BoogieDeclarations]: Found specification of procedure isFloorCalling [2021-11-21 01:06:37,231 INFO L138 BoogieDeclarations]: Found implementation of procedure isFloorCalling [2021-11-21 01:06:37,390 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 01:06:37,393 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 01:06:38,436 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 01:06:39,056 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 01:06:39,057 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-21 01:06:39,061 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:06:39 BoogieIcfgContainer [2021-11-21 01:06:39,062 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 01:06:39,064 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 01:06:39,064 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 01:06:39,069 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 01:06:39,069 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 01:06:35" (1/3) ... [2021-11-21 01:06:39,070 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2ec83d8d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:06:39, skipping insertion in model container [2021-11-21 01:06:39,070 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:06:36" (2/3) ... [2021-11-21 01:06:39,071 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2ec83d8d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:06:39, skipping insertion in model container [2021-11-21 01:06:39,071 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:06:39" (3/3) ... [2021-11-21 01:06:39,072 INFO L111 eAbstractionObserver]: Analyzing ICFG elevator_spec3_product01.cil.c [2021-11-21 01:06:39,081 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 01:06:39,081 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 01:06:39,146 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 01:06:39,155 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-21 01:06:39,155 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 01:06:39,197 INFO L276 IsEmpty]: Start isEmpty. Operand has 377 states, 254 states have (on average 1.5984251968503937) internal successors, (406), 272 states have internal predecessors, (406), 98 states have call successors, (98), 23 states have call predecessors, (98), 23 states have return successors, (98), 95 states have call predecessors, (98), 98 states have call successors, (98) [2021-11-21 01:06:39,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-21 01:06:39,227 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:06:39,228 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-21 01:06:39,228 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:06:39,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:06:39,235 INFO L85 PathProgramCache]: Analyzing trace with hash 1523319636, now seen corresponding path program 1 times [2021-11-21 01:06:39,245 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:06:39,245 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1753191779] [2021-11-21 01:06:39,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:06:39,247 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:06:39,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:39,868 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:06:39,868 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:06:39,868 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1753191779] [2021-11-21 01:06:39,869 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1753191779] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:06:39,870 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1606478411] [2021-11-21 01:06:39,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:06:39,870 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:06:39,870 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:06:39,872 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:06:39,897 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 01:06:40,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:40,287 INFO L263 TraceCheckSpWp]: Trace formula consists of 1504 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 01:06:40,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:06:40,513 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:06:40,513 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:06:40,513 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1606478411] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:06:40,513 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:06:40,514 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-21 01:06:40,516 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [480175882] [2021-11-21 01:06:40,516 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:06:40,521 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:06:40,521 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:06:40,546 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:06:40,547 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-21 01:06:40,550 INFO L87 Difference]: Start difference. First operand has 377 states, 254 states have (on average 1.5984251968503937) internal successors, (406), 272 states have internal predecessors, (406), 98 states have call successors, (98), 23 states have call predecessors, (98), 23 states have return successors, (98), 95 states have call predecessors, (98), 98 states have call successors, (98) Second operand has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-21 01:06:40,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:06:40,919 INFO L93 Difference]: Finished difference Result 1056 states and 1713 transitions. [2021-11-21 01:06:40,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:06:40,922 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 63 [2021-11-21 01:06:40,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:06:40,953 INFO L225 Difference]: With dead ends: 1056 [2021-11-21 01:06:40,954 INFO L226 Difference]: Without dead ends: 681 [2021-11-21 01:06:40,965 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-21 01:06:40,971 INFO L933 BasicCegarLoop]: 643 mSDtfsCounter, 552 mSDsluCounter, 507 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 552 SdHoareTripleChecker+Valid, 1121 SdHoareTripleChecker+Invalid, 85 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:06:40,972 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [552 Valid, 1121 Invalid, 85 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:06:41,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 681 states. [2021-11-21 01:06:41,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 681 to 669. [2021-11-21 01:06:41,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 669 states, 456 states have (on average 1.5921052631578947) internal successors, (726), 487 states have internal predecessors, (726), 172 states have call successors, (172), 41 states have call predecessors, (172), 40 states have return successors, (174), 166 states have call predecessors, (174), 169 states have call successors, (174) [2021-11-21 01:06:41,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 669 states to 669 states and 1072 transitions. [2021-11-21 01:06:41,134 INFO L78 Accepts]: Start accepts. Automaton has 669 states and 1072 transitions. Word has length 63 [2021-11-21 01:06:41,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:06:41,135 INFO L470 AbstractCegarLoop]: Abstraction has 669 states and 1072 transitions. [2021-11-21 01:06:41,135 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.666666666666666) internal successors, (41), 3 states have internal predecessors, (41), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-21 01:06:41,135 INFO L276 IsEmpty]: Start isEmpty. Operand 669 states and 1072 transitions. [2021-11-21 01:06:41,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-21 01:06:41,141 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:06:41,142 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-21 01:06:41,179 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 01:06:41,360 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2021-11-21 01:06:41,360 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:06:41,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:06:41,361 INFO L85 PathProgramCache]: Analyzing trace with hash -594469980, now seen corresponding path program 1 times [2021-11-21 01:06:41,361 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:06:41,362 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [593690496] [2021-11-21 01:06:41,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:06:41,362 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:06:41,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:41,569 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:06:41,570 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:06:41,573 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [593690496] [2021-11-21 01:06:41,575 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [593690496] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:06:41,576 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [528073271] [2021-11-21 01:06:41,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:06:41,576 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:06:41,576 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:06:41,582 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:06:41,600 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 01:06:41,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:41,913 INFO L263 TraceCheckSpWp]: Trace formula consists of 1515 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 01:06:41,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:06:42,094 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:06:42,095 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:06:42,095 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [528073271] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:06:42,095 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:06:42,095 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8] total 9 [2021-11-21 01:06:42,096 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1977805047] [2021-11-21 01:06:42,096 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:06:42,097 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:06:42,097 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:06:42,097 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:06:42,098 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-21 01:06:42,098 INFO L87 Difference]: Start difference. First operand 669 states and 1072 transitions. Second operand has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 3 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 2 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-21 01:06:42,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:06:42,401 INFO L93 Difference]: Finished difference Result 1905 states and 3088 transitions. [2021-11-21 01:06:42,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:06:42,402 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 3 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 2 states have call predecessors, (11), 3 states have call successors, (11) Word has length 64 [2021-11-21 01:06:42,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:06:42,417 INFO L225 Difference]: With dead ends: 1905 [2021-11-21 01:06:42,417 INFO L226 Difference]: Without dead ends: 1248 [2021-11-21 01:06:42,423 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-21 01:06:42,426 INFO L933 BasicCegarLoop]: 670 mSDtfsCounter, 474 mSDsluCounter, 511 mSDsCounter, 0 mSdLazyCounter, 151 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 474 SdHoareTripleChecker+Valid, 1156 SdHoareTripleChecker+Invalid, 172 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 151 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:06:42,427 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [474 Valid, 1156 Invalid, 172 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 151 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:06:42,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1248 states. [2021-11-21 01:06:42,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1248 to 1228. [2021-11-21 01:06:42,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1228 states, 833 states have (on average 1.547418967587035) internal successors, (1289), 893 states have internal predecessors, (1289), 321 states have call successors, (321), 76 states have call predecessors, (321), 73 states have return successors, (340), 308 states have call predecessors, (340), 317 states have call successors, (340) [2021-11-21 01:06:42,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1228 states to 1228 states and 1950 transitions. [2021-11-21 01:06:42,597 INFO L78 Accepts]: Start accepts. Automaton has 1228 states and 1950 transitions. Word has length 64 [2021-11-21 01:06:42,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:06:42,598 INFO L470 AbstractCegarLoop]: Abstraction has 1228 states and 1950 transitions. [2021-11-21 01:06:42,598 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.333333333333334) internal successors, (40), 3 states have internal predecessors, (40), 3 states have call successors, (13), 3 states have call predecessors, (13), 2 states have return successors, (11), 2 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-21 01:06:42,598 INFO L276 IsEmpty]: Start isEmpty. Operand 1228 states and 1950 transitions. [2021-11-21 01:06:42,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-21 01:06:42,602 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:06:42,602 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-21 01:06:42,641 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 01:06:42,822 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:06:42,822 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:06:42,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:06:42,823 INFO L85 PathProgramCache]: Analyzing trace with hash 1764450137, now seen corresponding path program 1 times [2021-11-21 01:06:42,823 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:06:42,824 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [59024654] [2021-11-21 01:06:42,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:06:42,824 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:06:42,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:43,042 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:06:43,042 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:06:43,043 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [59024654] [2021-11-21 01:06:43,046 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [59024654] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:06:43,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1259393521] [2021-11-21 01:06:43,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:06:43,046 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:06:43,047 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:06:43,049 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:06:43,073 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 01:06:43,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:43,369 INFO L263 TraceCheckSpWp]: Trace formula consists of 1531 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 01:06:43,374 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:06:43,511 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:06:43,511 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:06:43,511 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1259393521] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:06:43,511 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:06:43,512 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [8] total 10 [2021-11-21 01:06:43,513 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1018107688] [2021-11-21 01:06:43,513 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:06:43,513 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:06:43,514 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:06:43,514 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:06:43,515 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-11-21 01:06:43,515 INFO L87 Difference]: Start difference. First operand 1228 states and 1950 transitions. Second operand has 4 states, 4 states have (on average 10.5) internal successors, (42), 4 states have internal predecessors, (42), 2 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2021-11-21 01:06:43,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:06:43,867 INFO L93 Difference]: Finished difference Result 2375 states and 3847 transitions. [2021-11-21 01:06:43,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 01:06:43,868 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 10.5) internal successors, (42), 4 states have internal predecessors, (42), 2 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) Word has length 68 [2021-11-21 01:06:43,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:06:43,882 INFO L225 Difference]: With dead ends: 2375 [2021-11-21 01:06:43,882 INFO L226 Difference]: Without dead ends: 1594 [2021-11-21 01:06:43,888 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-11-21 01:06:43,889 INFO L933 BasicCegarLoop]: 620 mSDtfsCounter, 139 mSDsluCounter, 1190 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 90 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 1747 SdHoareTripleChecker+Invalid, 196 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 90 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:06:43,890 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [139 Valid, 1747 Invalid, 196 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [90 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:06:43,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1594 states. [2021-11-21 01:06:43,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1594 to 1414. [2021-11-21 01:06:43,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1414 states, 929 states have (on average 1.534983853606028) internal successors, (1426), 1015 states have internal predecessors, (1426), 409 states have call successors, (409), 76 states have call predecessors, (409), 75 states have return successors, (436), 396 states have call predecessors, (436), 405 states have call successors, (436) [2021-11-21 01:06:43,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1414 states to 1414 states and 2271 transitions. [2021-11-21 01:06:43,997 INFO L78 Accepts]: Start accepts. Automaton has 1414 states and 2271 transitions. Word has length 68 [2021-11-21 01:06:43,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:06:43,998 INFO L470 AbstractCegarLoop]: Abstraction has 1414 states and 2271 transitions. [2021-11-21 01:06:43,998 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 10.5) internal successors, (42), 4 states have internal predecessors, (42), 2 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2021-11-21 01:06:43,998 INFO L276 IsEmpty]: Start isEmpty. Operand 1414 states and 2271 transitions. [2021-11-21 01:06:44,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-21 01:06:44,001 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:06:44,001 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-21 01:06:44,040 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 01:06:44,225 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:06:44,225 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:06:44,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:06:44,226 INFO L85 PathProgramCache]: Analyzing trace with hash 1396583808, now seen corresponding path program 1 times [2021-11-21 01:06:44,226 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:06:44,226 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1382894795] [2021-11-21 01:06:44,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:06:44,227 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:06:44,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:44,389 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-21 01:06:44,390 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:06:44,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1382894795] [2021-11-21 01:06:44,390 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1382894795] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:06:44,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [399985921] [2021-11-21 01:06:44,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:06:44,391 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:06:44,391 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:06:44,392 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:06:44,411 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 01:06:44,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:44,713 INFO L263 TraceCheckSpWp]: Trace formula consists of 1542 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 01:06:44,717 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:06:44,938 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:06:44,938 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:06:44,938 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [399985921] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:06:44,938 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:06:44,939 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2021-11-21 01:06:44,939 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1731322734] [2021-11-21 01:06:44,939 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:06:44,940 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:06:44,940 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:06:44,940 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:06:44,940 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-11-21 01:06:44,941 INFO L87 Difference]: Start difference. First operand 1414 states and 2271 transitions. Second operand has 5 states, 5 states have (on average 8.6) internal successors, (43), 5 states have internal predecessors, (43), 4 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) [2021-11-21 01:06:45,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:06:45,564 INFO L93 Difference]: Finished difference Result 2533 states and 4052 transitions. [2021-11-21 01:06:45,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:06:45,564 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 8.6) internal successors, (43), 5 states have internal predecessors, (43), 4 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) Word has length 72 [2021-11-21 01:06:45,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:06:45,581 INFO L225 Difference]: With dead ends: 2533 [2021-11-21 01:06:45,582 INFO L226 Difference]: Without dead ends: 1572 [2021-11-21 01:06:45,590 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-11-21 01:06:45,591 INFO L933 BasicCegarLoop]: 699 mSDtfsCounter, 527 mSDsluCounter, 1400 mSDsCounter, 0 mSdLazyCounter, 501 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 535 SdHoareTripleChecker+Valid, 2013 SdHoareTripleChecker+Invalid, 507 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 501 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 01:06:45,592 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [535 Valid, 2013 Invalid, 507 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 501 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 01:06:45,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1572 states. [2021-11-21 01:06:45,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1572 to 1558. [2021-11-21 01:06:45,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1558 states, 1045 states have (on average 1.5196172248803828) internal successors, (1588), 1133 states have internal predecessors, (1588), 427 states have call successors, (427), 84 states have call predecessors, (427), 85 states have return successors, (456), 414 states have call predecessors, (456), 423 states have call successors, (456) [2021-11-21 01:06:45,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1558 states to 1558 states and 2471 transitions. [2021-11-21 01:06:45,724 INFO L78 Accepts]: Start accepts. Automaton has 1558 states and 2471 transitions. Word has length 72 [2021-11-21 01:06:45,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:06:45,725 INFO L470 AbstractCegarLoop]: Abstraction has 1558 states and 2471 transitions. [2021-11-21 01:06:45,725 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 8.6) internal successors, (43), 5 states have internal predecessors, (43), 4 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) [2021-11-21 01:06:45,726 INFO L276 IsEmpty]: Start isEmpty. Operand 1558 states and 2471 transitions. [2021-11-21 01:06:45,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-11-21 01:06:45,728 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:06:45,729 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-21 01:06:45,768 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 01:06:45,949 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:06:45,949 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:06:45,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:06:45,950 INFO L85 PathProgramCache]: Analyzing trace with hash -592867885, now seen corresponding path program 1 times [2021-11-21 01:06:45,950 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:06:45,950 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1649276974] [2021-11-21 01:06:45,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:06:45,950 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:06:45,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:46,054 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-21 01:06:46,054 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:06:46,054 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1649276974] [2021-11-21 01:06:46,054 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1649276974] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:06:46,054 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [44741617] [2021-11-21 01:06:46,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:06:46,055 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:06:46,055 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:06:46,056 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:06:46,061 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 01:06:46,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:46,360 INFO L263 TraceCheckSpWp]: Trace formula consists of 1531 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 01:06:46,364 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:06:46,537 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:06:46,538 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:06:46,538 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [44741617] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:06:46,538 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:06:46,538 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2021-11-21 01:06:46,538 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1891352717] [2021-11-21 01:06:46,539 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:06:46,539 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:06:46,539 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:06:46,540 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:06:46,540 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-21 01:06:46,540 INFO L87 Difference]: Start difference. First operand 1558 states and 2471 transitions. Second operand has 4 states, 4 states have (on average 11.5) internal successors, (46), 4 states have internal predecessors, (46), 2 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2021-11-21 01:06:46,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:06:46,861 INFO L93 Difference]: Finished difference Result 2921 states and 4685 transitions. [2021-11-21 01:06:46,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 01:06:46,862 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), 2 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) Word has length 73 [2021-11-21 01:06:46,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:06:46,896 INFO L225 Difference]: With dead ends: 2921 [2021-11-21 01:06:46,896 INFO L226 Difference]: Without dead ends: 1558 [2021-11-21 01:06:46,906 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-11-21 01:06:46,907 INFO L933 BasicCegarLoop]: 590 mSDtfsCounter, 279 mSDsluCounter, 1008 mSDsCounter, 0 mSdLazyCounter, 158 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 290 SdHoareTripleChecker+Valid, 1534 SdHoareTripleChecker+Invalid, 184 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 158 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:06:46,908 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [290 Valid, 1534 Invalid, 184 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 158 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:06:46,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1558 states. [2021-11-21 01:06:47,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1558 to 1558. [2021-11-21 01:06:47,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1558 states, 1045 states have (on average 1.4851674641148325) internal successors, (1552), 1133 states have internal predecessors, (1552), 427 states have call successors, (427), 84 states have call predecessors, (427), 85 states have return successors, (456), 414 states have call predecessors, (456), 423 states have call successors, (456) [2021-11-21 01:06:47,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1558 states to 1558 states and 2435 transitions. [2021-11-21 01:06:47,033 INFO L78 Accepts]: Start accepts. Automaton has 1558 states and 2435 transitions. Word has length 73 [2021-11-21 01:06:47,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:06:47,033 INFO L470 AbstractCegarLoop]: Abstraction has 1558 states and 2435 transitions. [2021-11-21 01:06:47,034 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), 2 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2021-11-21 01:06:47,034 INFO L276 IsEmpty]: Start isEmpty. Operand 1558 states and 2435 transitions. [2021-11-21 01:06:47,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-21 01:06:47,037 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:06:47,037 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-21 01:06:47,074 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 01:06:47,253 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:06:47,253 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:06:47,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:06:47,254 INFO L85 PathProgramCache]: Analyzing trace with hash -301825873, now seen corresponding path program 1 times [2021-11-21 01:06:47,254 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:06:47,254 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [88564218] [2021-11-21 01:06:47,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:06:47,254 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:06:47,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:47,365 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-21 01:06:47,366 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:06:47,366 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [88564218] [2021-11-21 01:06:47,366 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [88564218] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:06:47,366 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [723169699] [2021-11-21 01:06:47,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:06:47,367 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:06:47,367 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:06:47,368 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:06:47,387 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 01:06:47,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:47,663 INFO L263 TraceCheckSpWp]: Trace formula consists of 1541 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-21 01:06:47,668 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:06:47,982 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:06:47,982 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:06:48,387 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-21 01:06:48,388 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [723169699] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-21 01:06:48,388 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-21 01:06:48,388 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [6, 9] total 16 [2021-11-21 01:06:48,388 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [238270452] [2021-11-21 01:06:48,388 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:06:48,389 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-21 01:06:48,389 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:06:48,389 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-21 01:06:48,390 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=203, Unknown=0, NotChecked=0, Total=240 [2021-11-21 01:06:48,390 INFO L87 Difference]: Start difference. First operand 1558 states and 2435 transitions. Second operand has 9 states, 8 states have (on average 5.625) internal successors, (45), 8 states have internal predecessors, (45), 4 states have call successors, (15), 4 states have call predecessors, (15), 4 states have return successors, (13), 4 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-21 01:06:51,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:06:51,667 INFO L93 Difference]: Finished difference Result 3843 states and 6232 transitions. [2021-11-21 01:06:51,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-21 01:06:51,668 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 5.625) internal successors, (45), 8 states have internal predecessors, (45), 4 states have call successors, (15), 4 states have call predecessors, (15), 4 states have return successors, (13), 4 states have call predecessors, (13), 3 states have call successors, (13) Word has length 75 [2021-11-21 01:06:51,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:06:51,694 INFO L225 Difference]: With dead ends: 3843 [2021-11-21 01:06:51,695 INFO L226 Difference]: Without dead ends: 2883 [2021-11-21 01:06:51,706 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=145, Invalid=725, Unknown=0, NotChecked=0, Total=870 [2021-11-21 01:06:51,708 INFO L933 BasicCegarLoop]: 698 mSDtfsCounter, 2253 mSDsluCounter, 2775 mSDsCounter, 0 mSdLazyCounter, 2629 mSolverCounterSat, 1023 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2332 SdHoareTripleChecker+Valid, 3323 SdHoareTripleChecker+Invalid, 3652 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1023 IncrementalHoareTripleChecker+Valid, 2629 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2021-11-21 01:06:51,709 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2332 Valid, 3323 Invalid, 3652 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1023 Valid, 2629 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2021-11-21 01:06:51,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2883 states. [2021-11-21 01:06:51,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2883 to 2419. [2021-11-21 01:06:51,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2419 states, 1720 states have (on average 1.4924418604651162) internal successors, (2567), 1815 states have internal predecessors, (2567), 548 states have call successors, (548), 145 states have call predecessors, (548), 150 states have return successors, (656), 530 states have call predecessors, (656), 543 states have call successors, (656) [2021-11-21 01:06:51,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2419 states to 2419 states and 3771 transitions. [2021-11-21 01:06:51,941 INFO L78 Accepts]: Start accepts. Automaton has 2419 states and 3771 transitions. Word has length 75 [2021-11-21 01:06:51,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:06:51,942 INFO L470 AbstractCegarLoop]: Abstraction has 2419 states and 3771 transitions. [2021-11-21 01:06:51,942 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 5.625) internal successors, (45), 8 states have internal predecessors, (45), 4 states have call successors, (15), 4 states have call predecessors, (15), 4 states have return successors, (13), 4 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-21 01:06:51,942 INFO L276 IsEmpty]: Start isEmpty. Operand 2419 states and 3771 transitions. [2021-11-21 01:06:51,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-21 01:06:51,945 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:06:51,946 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:06:51,985 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 01:06:52,161 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:06:52,161 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:06:52,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:06:52,162 INFO L85 PathProgramCache]: Analyzing trace with hash -1898010201, now seen corresponding path program 1 times [2021-11-21 01:06:52,162 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:06:52,162 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [155646337] [2021-11-21 01:06:52,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:06:52,162 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:06:52,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:52,262 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-21 01:06:52,262 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:06:52,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [155646337] [2021-11-21 01:06:52,263 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [155646337] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:06:52,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [865365843] [2021-11-21 01:06:52,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:06:52,263 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:06:52,263 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:06:52,264 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:06:52,270 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 01:06:52,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:52,566 INFO L263 TraceCheckSpWp]: Trace formula consists of 1531 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 01:06:52,570 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:06:52,703 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:06:52,704 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:06:52,704 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [865365843] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:06:52,704 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:06:52,704 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-21 01:06:52,704 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1106218485] [2021-11-21 01:06:52,705 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:06:52,706 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:06:52,706 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:06:52,706 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:06:52,706 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-21 01:06:52,707 INFO L87 Difference]: Start difference. First operand 2419 states and 3771 transitions. Second operand has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 3 states have call successors, (14), 3 states have call predecessors, (14), 3 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2021-11-21 01:06:53,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:06:53,076 INFO L93 Difference]: Finished difference Result 5980 states and 9479 transitions. [2021-11-21 01:06:53,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:06:53,077 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 3 states have call successors, (14), 3 states have call predecessors, (14), 3 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) Word has length 75 [2021-11-21 01:06:53,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:06:53,116 INFO L225 Difference]: With dead ends: 5980 [2021-11-21 01:06:53,117 INFO L226 Difference]: Without dead ends: 3573 [2021-11-21 01:06:53,137 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-21 01:06:53,138 INFO L933 BasicCegarLoop]: 818 mSDtfsCounter, 522 mSDsluCounter, 489 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 522 SdHoareTripleChecker+Valid, 1280 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:06:53,139 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [522 Valid, 1280 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:06:53,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3573 states. [2021-11-21 01:06:53,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3573 to 3505. [2021-11-21 01:06:53,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3505 states, 2502 states have (on average 1.4900079936051158) internal successors, (3728), 2645 states have internal predecessors, (3728), 784 states have call successors, (784), 207 states have call predecessors, (784), 218 states have return successors, (955), 760 states have call predecessors, (955), 779 states have call successors, (955) [2021-11-21 01:06:53,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3505 states to 3505 states and 5467 transitions. [2021-11-21 01:06:53,419 INFO L78 Accepts]: Start accepts. Automaton has 3505 states and 5467 transitions. Word has length 75 [2021-11-21 01:06:53,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:06:53,420 INFO L470 AbstractCegarLoop]: Abstraction has 3505 states and 5467 transitions. [2021-11-21 01:06:53,420 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 3 states have call successors, (14), 3 states have call predecessors, (14), 3 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2021-11-21 01:06:53,420 INFO L276 IsEmpty]: Start isEmpty. Operand 3505 states and 5467 transitions. [2021-11-21 01:06:53,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-21 01:06:53,427 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:06:53,427 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-21 01:06:53,472 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 01:06:53,641 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:06:53,641 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:06:53,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:06:53,642 INFO L85 PathProgramCache]: Analyzing trace with hash 1427051107, now seen corresponding path program 1 times [2021-11-21 01:06:53,642 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:06:53,642 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [600730640] [2021-11-21 01:06:53,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:06:53,642 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:06:53,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:53,781 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-21 01:06:53,781 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:06:53,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [600730640] [2021-11-21 01:06:53,782 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [600730640] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:06:53,782 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [251233109] [2021-11-21 01:06:53,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:06:53,782 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:06:53,782 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:06:53,785 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:06:53,790 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 01:06:54,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:54,112 INFO L263 TraceCheckSpWp]: Trace formula consists of 1543 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-21 01:06:54,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:06:54,265 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:06:54,266 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:06:54,266 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [251233109] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:06:54,266 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:06:54,266 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2021-11-21 01:06:54,269 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1751898545] [2021-11-21 01:06:54,269 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:06:54,270 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:06:54,270 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:06:54,270 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:06:54,271 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-21 01:06:54,271 INFO L87 Difference]: Start difference. First operand 3505 states and 5467 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), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) [2021-11-21 01:06:54,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:06:54,900 INFO L93 Difference]: Finished difference Result 7281 states and 11525 transitions. [2021-11-21 01:06:54,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:06:54,900 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), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) Word has length 76 [2021-11-21 01:06:54,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:06:54,938 INFO L225 Difference]: With dead ends: 7281 [2021-11-21 01:06:54,972 INFO L226 Difference]: Without dead ends: 3788 [2021-11-21 01:06:54,997 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-11-21 01:06:54,998 INFO L933 BasicCegarLoop]: 692 mSDtfsCounter, 569 mSDsluCounter, 1253 mSDsCounter, 0 mSdLazyCounter, 306 mSolverCounterSat, 134 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 624 SdHoareTripleChecker+Valid, 1885 SdHoareTripleChecker+Invalid, 440 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 134 IncrementalHoareTripleChecker+Valid, 306 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:06:54,998 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [624 Valid, 1885 Invalid, 440 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [134 Valid, 306 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:06:55,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3788 states. [2021-11-21 01:06:55,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3788 to 3420. [2021-11-21 01:06:55,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3420 states, 2429 states have (on average 1.4804446274186909) internal successors, (3596), 2574 states have internal predecessors, (3596), 784 states have call successors, (784), 193 states have call predecessors, (784), 206 states have return successors, (1017), 748 states have call predecessors, (1017), 779 states have call successors, (1017) [2021-11-21 01:06:55,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3420 states to 3420 states and 5397 transitions. [2021-11-21 01:06:55,260 INFO L78 Accepts]: Start accepts. Automaton has 3420 states and 5397 transitions. Word has length 76 [2021-11-21 01:06:55,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:06:55,262 INFO L470 AbstractCegarLoop]: Abstraction has 3420 states and 5397 transitions. [2021-11-21 01:06:55,263 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), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) [2021-11-21 01:06:55,263 INFO L276 IsEmpty]: Start isEmpty. Operand 3420 states and 5397 transitions. [2021-11-21 01:06:55,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-21 01:06:55,266 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:06:55,266 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-21 01:06:55,305 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-21 01:06:55,485 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:06:55,485 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:06:55,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:06:55,486 INFO L85 PathProgramCache]: Analyzing trace with hash -1900902815, now seen corresponding path program 1 times [2021-11-21 01:06:55,486 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:06:55,486 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [15840045] [2021-11-21 01:06:55,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:06:55,486 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:06:55,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:55,578 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-21 01:06:55,579 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:06:55,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [15840045] [2021-11-21 01:06:55,579 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [15840045] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:06:55,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1268360337] [2021-11-21 01:06:55,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:06:55,580 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:06:55,580 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:06:55,581 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:06:55,603 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-21 01:06:55,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:55,878 INFO L263 TraceCheckSpWp]: Trace formula consists of 1558 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-21 01:06:55,882 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:06:56,125 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:06:56,125 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:06:56,125 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1268360337] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:06:56,125 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:06:56,125 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2021-11-21 01:06:56,126 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1456451205] [2021-11-21 01:06:56,126 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:06:56,126 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:06:56,126 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:06:56,126 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:06:56,127 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-21 01:06:56,127 INFO L87 Difference]: Start difference. First operand 3420 states and 5397 transitions. Second operand has 5 states, 5 states have (on average 9.4) internal successors, (47), 5 states have internal predecessors, (47), 4 states have call successors, (16), 3 states have call predecessors, (16), 4 states have return successors, (14), 3 states have call predecessors, (14), 4 states have call successors, (14) [2021-11-21 01:06:56,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:06:56,755 INFO L93 Difference]: Finished difference Result 6280 states and 9942 transitions. [2021-11-21 01:06:56,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:06:56,756 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 9.4) internal successors, (47), 5 states have internal predecessors, (47), 4 states have call successors, (16), 3 states have call predecessors, (16), 4 states have return successors, (14), 3 states have call predecessors, (14), 4 states have call successors, (14) Word has length 79 [2021-11-21 01:06:56,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:06:56,790 INFO L225 Difference]: With dead ends: 6280 [2021-11-21 01:06:56,790 INFO L226 Difference]: Without dead ends: 3441 [2021-11-21 01:06:56,813 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2021-11-21 01:06:56,816 INFO L933 BasicCegarLoop]: 724 mSDtfsCounter, 407 mSDsluCounter, 1916 mSDsCounter, 0 mSdLazyCounter, 347 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 407 SdHoareTripleChecker+Valid, 2539 SdHoareTripleChecker+Invalid, 353 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 347 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:06:56,816 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [407 Valid, 2539 Invalid, 353 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 347 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:06:56,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3441 states. [2021-11-21 01:06:57,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3441 to 3424. [2021-11-21 01:06:57,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3424 states, 2429 states have (on average 1.4804446274186909) internal successors, (3596), 2578 states have internal predecessors, (3596), 788 states have call successors, (788), 193 states have call predecessors, (788), 206 states have return successors, (1021), 748 states have call predecessors, (1021), 783 states have call successors, (1021) [2021-11-21 01:06:57,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3424 states to 3424 states and 5405 transitions. [2021-11-21 01:06:57,127 INFO L78 Accepts]: Start accepts. Automaton has 3424 states and 5405 transitions. Word has length 79 [2021-11-21 01:06:57,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:06:57,128 INFO L470 AbstractCegarLoop]: Abstraction has 3424 states and 5405 transitions. [2021-11-21 01:06:57,128 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 9.4) internal successors, (47), 5 states have internal predecessors, (47), 4 states have call successors, (16), 3 states have call predecessors, (16), 4 states have return successors, (14), 3 states have call predecessors, (14), 4 states have call successors, (14) [2021-11-21 01:06:57,129 INFO L276 IsEmpty]: Start isEmpty. Operand 3424 states and 5405 transitions. [2021-11-21 01:06:57,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-21 01:06:57,134 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:06:57,134 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-21 01:06:57,176 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-21 01:06:57,357 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-21 01:06:57,357 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:06:57,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:06:57,358 INFO L85 PathProgramCache]: Analyzing trace with hash -839992010, now seen corresponding path program 1 times [2021-11-21 01:06:57,358 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:06:57,358 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2031164614] [2021-11-21 01:06:57,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:06:57,358 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:06:57,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:57,471 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-21 01:06:57,471 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:06:57,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2031164614] [2021-11-21 01:06:57,471 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2031164614] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:06:57,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1738543584] [2021-11-21 01:06:57,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:06:57,472 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:06:57,472 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:06:57,473 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:06:57,499 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-21 01:06:57,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:57,782 INFO L263 TraceCheckSpWp]: Trace formula consists of 1630 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-21 01:06:57,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:06:57,968 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-21 01:06:57,968 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:06:57,969 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1738543584] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:06:57,969 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:06:57,969 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2021-11-21 01:06:57,970 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2072753013] [2021-11-21 01:06:57,970 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:06:57,971 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 01:06:57,971 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:06:57,971 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 01:06:57,971 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-21 01:06:57,972 INFO L87 Difference]: Start difference. First operand 3424 states and 5405 transitions. Second operand has 5 states, 5 states have (on average 11.4) internal successors, (57), 4 states have internal predecessors, (57), 2 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (18), 3 states have call predecessors, (18), 2 states have call successors, (18) [2021-11-21 01:06:58,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:06:58,266 INFO L93 Difference]: Finished difference Result 6597 states and 10654 transitions. [2021-11-21 01:06:58,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:06:58,267 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.4) internal successors, (57), 4 states have internal predecessors, (57), 2 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (18), 3 states have call predecessors, (18), 2 states have call successors, (18) Word has length 99 [2021-11-21 01:06:58,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:06:58,379 INFO L225 Difference]: With dead ends: 6597 [2021-11-21 01:06:58,379 INFO L226 Difference]: Without dead ends: 3615 [2021-11-21 01:06:58,399 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-21 01:06:58,399 INFO L933 BasicCegarLoop]: 561 mSDtfsCounter, 13 mSDsluCounter, 1749 mSDsCounter, 0 mSdLazyCounter, 143 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 2214 SdHoareTripleChecker+Invalid, 160 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 143 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:06:58,400 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 2214 Invalid, 160 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 143 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:06:58,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3615 states. [2021-11-21 01:06:58,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3615 to 3498. [2021-11-21 01:06:58,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3498 states, 2479 states have (on average 1.4707543364259783) internal successors, (3646), 2637 states have internal predecessors, (3646), 792 states have call successors, (792), 193 states have call predecessors, (792), 226 states have return successors, (1143), 763 states have call predecessors, (1143), 787 states have call successors, (1143) [2021-11-21 01:06:58,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3498 states to 3498 states and 5581 transitions. [2021-11-21 01:06:58,670 INFO L78 Accepts]: Start accepts. Automaton has 3498 states and 5581 transitions. Word has length 99 [2021-11-21 01:06:58,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:06:58,671 INFO L470 AbstractCegarLoop]: Abstraction has 3498 states and 5581 transitions. [2021-11-21 01:06:58,671 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.4) internal successors, (57), 4 states have internal predecessors, (57), 2 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (18), 3 states have call predecessors, (18), 2 states have call successors, (18) [2021-11-21 01:06:58,671 INFO L276 IsEmpty]: Start isEmpty. Operand 3498 states and 5581 transitions. [2021-11-21 01:06:58,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-11-21 01:06:58,681 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:06:58,681 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:06:58,720 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-21 01:06:58,905 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:06:58,905 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:06:58,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:06:58,906 INFO L85 PathProgramCache]: Analyzing trace with hash 1317662866, now seen corresponding path program 1 times [2021-11-21 01:06:58,906 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:06:58,906 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [679598285] [2021-11-21 01:06:58,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:06:58,906 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:06:58,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:59,026 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 18 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-21 01:06:59,026 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:06:59,026 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [679598285] [2021-11-21 01:06:59,027 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [679598285] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:06:59,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1000472842] [2021-11-21 01:06:59,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:06:59,027 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:06:59,027 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:06:59,028 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:06:59,048 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-21 01:06:59,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:59,374 INFO L263 TraceCheckSpWp]: Trace formula consists of 1863 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-21 01:06:59,379 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:06:59,684 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 39 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-21 01:06:59,684 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:06:59,684 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1000472842] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:06:59,684 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:06:59,684 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [8] total 14 [2021-11-21 01:06:59,685 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1273743354] [2021-11-21 01:06:59,685 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:06:59,685 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-21 01:06:59,686 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:06:59,686 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-21 01:06:59,686 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2021-11-21 01:06:59,718 INFO L87 Difference]: Start difference. First operand 3498 states and 5581 transitions. Second operand has 8 states, 7 states have (on average 10.571428571428571) internal successors, (74), 7 states have internal predecessors, (74), 5 states have call successors, (21), 4 states have call predecessors, (21), 5 states have return successors, (19), 5 states have call predecessors, (19), 5 states have call successors, (19) [2021-11-21 01:07:03,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:07:03,039 INFO L93 Difference]: Finished difference Result 7783 states and 12613 transitions. [2021-11-21 01:07:03,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-21 01:07:03,040 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 10.571428571428571) internal successors, (74), 7 states have internal predecessors, (74), 5 states have call successors, (21), 4 states have call predecessors, (21), 5 states have return successors, (19), 5 states have call predecessors, (19), 5 states have call successors, (19) Word has length 117 [2021-11-21 01:07:03,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:07:03,079 INFO L225 Difference]: With dead ends: 7783 [2021-11-21 01:07:03,079 INFO L226 Difference]: Without dead ends: 4181 [2021-11-21 01:07:03,097 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=96, Invalid=504, Unknown=0, NotChecked=0, Total=600 [2021-11-21 01:07:03,098 INFO L933 BasicCegarLoop]: 641 mSDtfsCounter, 1612 mSDsluCounter, 1266 mSDsCounter, 0 mSdLazyCounter, 3379 mSolverCounterSat, 1076 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1643 SdHoareTripleChecker+Valid, 1787 SdHoareTripleChecker+Invalid, 4455 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1076 IncrementalHoareTripleChecker+Valid, 3379 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2021-11-21 01:07:03,098 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1643 Valid, 1787 Invalid, 4455 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1076 Valid, 3379 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2021-11-21 01:07:03,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4181 states. [2021-11-21 01:07:03,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4181 to 3493. [2021-11-21 01:07:03,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3493 states, 2474 states have (on average 1.471301535974131) internal successors, (3640), 2632 states have internal predecessors, (3640), 792 states have call successors, (792), 193 states have call predecessors, (792), 226 states have return successors, (1143), 763 states have call predecessors, (1143), 787 states have call successors, (1143) [2021-11-21 01:07:03,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3493 states to 3493 states and 5575 transitions. [2021-11-21 01:07:03,434 INFO L78 Accepts]: Start accepts. Automaton has 3493 states and 5575 transitions. Word has length 117 [2021-11-21 01:07:03,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:07:03,434 INFO L470 AbstractCegarLoop]: Abstraction has 3493 states and 5575 transitions. [2021-11-21 01:07:03,435 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 10.571428571428571) internal successors, (74), 7 states have internal predecessors, (74), 5 states have call successors, (21), 4 states have call predecessors, (21), 5 states have return successors, (19), 5 states have call predecessors, (19), 5 states have call successors, (19) [2021-11-21 01:07:03,435 INFO L276 IsEmpty]: Start isEmpty. Operand 3493 states and 5575 transitions. [2021-11-21 01:07:03,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-11-21 01:07:03,444 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:07:03,444 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:07:03,486 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-21 01:07:03,665 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-21 01:07:03,665 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:07:03,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:07:03,666 INFO L85 PathProgramCache]: Analyzing trace with hash 2095557858, now seen corresponding path program 1 times [2021-11-21 01:07:03,666 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:07:03,666 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1315075046] [2021-11-21 01:07:03,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:07:03,667 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:07:03,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:07:03,868 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 22 proven. 3 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-21 01:07:03,868 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:07:03,868 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1315075046] [2021-11-21 01:07:03,868 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1315075046] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:07:03,868 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [170613502] [2021-11-21 01:07:03,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:07:03,869 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:07:03,869 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:07:03,870 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:07:03,890 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-21 01:07:04,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:07:04,202 INFO L263 TraceCheckSpWp]: Trace formula consists of 1874 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 01:07:04,206 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:07:04,453 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 49 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-21 01:07:04,454 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:07:04,454 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [170613502] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:07:04,454 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:07:04,454 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8] total 9 [2021-11-21 01:07:04,456 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1800373015] [2021-11-21 01:07:04,456 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:07:04,457 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:07:04,457 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:07:04,457 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:07:04,457 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-21 01:07:04,458 INFO L87 Difference]: Start difference. First operand 3493 states and 5575 transitions. Second operand has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 states have internal predecessors, (73), 3 states have call successors, (22), 3 states have call predecessors, (22), 3 states have return successors, (20), 3 states have call predecessors, (20), 3 states have call successors, (20) [2021-11-21 01:07:04,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:07:04,901 INFO L93 Difference]: Finished difference Result 8154 states and 13245 transitions. [2021-11-21 01:07:04,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:07:04,902 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 states have internal predecessors, (73), 3 states have call successors, (22), 3 states have call predecessors, (22), 3 states have return successors, (20), 3 states have call predecessors, (20), 3 states have call successors, (20) Word has length 118 [2021-11-21 01:07:04,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:07:04,950 INFO L225 Difference]: With dead ends: 8154 [2021-11-21 01:07:04,950 INFO L226 Difference]: Without dead ends: 4673 [2021-11-21 01:07:04,970 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-21 01:07:04,971 INFO L933 BasicCegarLoop]: 772 mSDtfsCounter, 459 mSDsluCounter, 562 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 459 SdHoareTripleChecker+Valid, 1305 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:07:04,971 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [459 Valid, 1305 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:07:04,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4673 states. [2021-11-21 01:07:05,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4673 to 4605. [2021-11-21 01:07:05,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4605 states, 3272 states have (on average 1.4734107579462103) internal successors, (4821), 3486 states have internal predecessors, (4821), 1033 states have call successors, (1033), 252 states have call predecessors, (1033), 299 states have return successors, (1482), 998 states have call predecessors, (1482), 1028 states have call successors, (1482) [2021-11-21 01:07:05,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4605 states to 4605 states and 7336 transitions. [2021-11-21 01:07:05,348 INFO L78 Accepts]: Start accepts. Automaton has 4605 states and 7336 transitions. Word has length 118 [2021-11-21 01:07:05,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:07:05,349 INFO L470 AbstractCegarLoop]: Abstraction has 4605 states and 7336 transitions. [2021-11-21 01:07:05,350 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 states have internal predecessors, (73), 3 states have call successors, (22), 3 states have call predecessors, (22), 3 states have return successors, (20), 3 states have call predecessors, (20), 3 states have call successors, (20) [2021-11-21 01:07:05,350 INFO L276 IsEmpty]: Start isEmpty. Operand 4605 states and 7336 transitions. [2021-11-21 01:07:05,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-11-21 01:07:05,363 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:07:05,363 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:07:05,403 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-21 01:07:05,585 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-21 01:07:05,585 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:07:05,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:07:05,586 INFO L85 PathProgramCache]: Analyzing trace with hash -31349416, now seen corresponding path program 1 times [2021-11-21 01:07:05,586 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:07:05,586 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [306305464] [2021-11-21 01:07:05,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:07:05,586 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:07:05,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:07:05,722 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 25 proven. 3 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-21 01:07:05,723 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:07:05,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [306305464] [2021-11-21 01:07:05,723 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [306305464] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:07:05,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [529483673] [2021-11-21 01:07:05,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:07:05,724 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:07:05,724 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:07:05,725 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:07:05,729 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-21 01:07:06,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:07:06,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 1889 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 01:07:06,069 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:07:06,344 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 51 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-21 01:07:06,344 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:07:06,344 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [529483673] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:07:06,345 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:07:06,345 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [8] total 10 [2021-11-21 01:07:06,345 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [651766117] [2021-11-21 01:07:06,346 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:07:06,346 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:07:06,346 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:07:06,347 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:07:06,347 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2021-11-21 01:07:06,347 INFO L87 Difference]: Start difference. First operand 4605 states and 7336 transitions. Second operand has 4 states, 4 states have (on average 18.5) internal successors, (74), 4 states have internal predecessors, (74), 4 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (21), 4 states have call predecessors, (21), 4 states have call successors, (21) [2021-11-21 01:07:07,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:07:07,494 INFO L93 Difference]: Finished difference Result 9235 states and 15075 transitions. [2021-11-21 01:07:07,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:07:07,495 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), 4 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (21), 4 states have call predecessors, (21), 4 states have call successors, (21) Word has length 123 [2021-11-21 01:07:07,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:07:07,536 INFO L225 Difference]: With dead ends: 9235 [2021-11-21 01:07:07,536 INFO L226 Difference]: Without dead ends: 5475 [2021-11-21 01:07:07,561 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2021-11-21 01:07:07,562 INFO L933 BasicCegarLoop]: 598 mSDtfsCounter, 671 mSDsluCounter, 627 mSDsCounter, 0 mSdLazyCounter, 604 mSolverCounterSat, 162 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 726 SdHoareTripleChecker+Valid, 1172 SdHoareTripleChecker+Invalid, 766 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 162 IncrementalHoareTripleChecker+Valid, 604 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-21 01:07:07,562 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [726 Valid, 1172 Invalid, 766 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [162 Valid, 604 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-21 01:07:07,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5475 states. [2021-11-21 01:07:07,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5475 to 5359. [2021-11-21 01:07:07,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5359 states, 3708 states have (on average 1.4684466019417475) internal successors, (5445), 3968 states have internal predecessors, (5445), 1288 states have call successors, (1288), 324 states have call predecessors, (1288), 362 states have return successors, (1784), 1246 states have call predecessors, (1784), 1281 states have call successors, (1784) [2021-11-21 01:07:08,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5359 states to 5359 states and 8517 transitions. [2021-11-21 01:07:08,014 INFO L78 Accepts]: Start accepts. Automaton has 5359 states and 8517 transitions. Word has length 123 [2021-11-21 01:07:08,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:07:08,014 INFO L470 AbstractCegarLoop]: Abstraction has 5359 states and 8517 transitions. [2021-11-21 01:07:08,015 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), 4 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (21), 4 states have call predecessors, (21), 4 states have call successors, (21) [2021-11-21 01:07:08,015 INFO L276 IsEmpty]: Start isEmpty. Operand 5359 states and 8517 transitions. [2021-11-21 01:07:08,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-21 01:07:08,027 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:07:08,027 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:07:08,066 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-21 01:07:08,241 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:07:08,241 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:07:08,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:07:08,242 INFO L85 PathProgramCache]: Analyzing trace with hash 1200837506, now seen corresponding path program 1 times [2021-11-21 01:07:08,242 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:07:08,242 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1430149129] [2021-11-21 01:07:08,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:07:08,242 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:07:08,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:07:08,367 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 19 proven. 3 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-21 01:07:08,368 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:07:08,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1430149129] [2021-11-21 01:07:08,368 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1430149129] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:07:08,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [135577401] [2021-11-21 01:07:08,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:07:08,369 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:07:08,370 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:07:08,371 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:07:08,389 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-21 01:07:08,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:07:08,667 INFO L263 TraceCheckSpWp]: Trace formula consists of 1891 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 01:07:08,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:07:08,949 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 45 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-21 01:07:08,949 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:07:08,949 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [135577401] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:07:08,949 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:07:08,949 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [8] total 10 [2021-11-21 01:07:08,949 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1308230669] [2021-11-21 01:07:08,949 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:07:08,950 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:07:08,950 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:07:08,951 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:07:08,951 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2021-11-21 01:07:08,951 INFO L87 Difference]: Start difference. First operand 5359 states and 8517 transitions. Second operand has 4 states, 4 states have (on average 18.75) internal successors, (75), 4 states have internal predecessors, (75), 4 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (21), 4 states have call predecessors, (21), 4 states have call successors, (21) [2021-11-21 01:07:10,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:07:10,291 INFO L93 Difference]: Finished difference Result 12851 states and 20864 transitions. [2021-11-21 01:07:10,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 01:07:10,292 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.75) internal successors, (75), 4 states have internal predecessors, (75), 4 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (21), 4 states have call predecessors, (21), 4 states have call successors, (21) Word has length 124 [2021-11-21 01:07:10,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:07:10,361 INFO L225 Difference]: With dead ends: 12851 [2021-11-21 01:07:10,361 INFO L226 Difference]: Without dead ends: 8315 [2021-11-21 01:07:10,403 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2021-11-21 01:07:10,404 INFO L933 BasicCegarLoop]: 851 mSDtfsCounter, 551 mSDsluCounter, 826 mSDsCounter, 0 mSdLazyCounter, 729 mSolverCounterSat, 151 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 611 SdHoareTripleChecker+Valid, 1609 SdHoareTripleChecker+Invalid, 880 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 151 IncrementalHoareTripleChecker+Valid, 729 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-21 01:07:10,405 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [611 Valid, 1609 Invalid, 880 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [151 Valid, 729 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-21 01:07:10,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8315 states. [2021-11-21 01:07:10,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8315 to 8297. [2021-11-21 01:07:11,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8297 states, 5632 states have (on average 1.4723011363636365) internal successors, (8292), 6066 states have internal predecessors, (8292), 2106 states have call successors, (2106), 518 states have call predecessors, (2106), 558 states have return successors, (2790), 2036 states have call predecessors, (2790), 2095 states have call successors, (2790) [2021-11-21 01:07:11,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8297 states to 8297 states and 13188 transitions. [2021-11-21 01:07:11,124 INFO L78 Accepts]: Start accepts. Automaton has 8297 states and 13188 transitions. Word has length 124 [2021-11-21 01:07:11,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:07:11,127 INFO L470 AbstractCegarLoop]: Abstraction has 8297 states and 13188 transitions. [2021-11-21 01:07:11,128 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.75) internal successors, (75), 4 states have internal predecessors, (75), 4 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (21), 4 states have call predecessors, (21), 4 states have call successors, (21) [2021-11-21 01:07:11,128 INFO L276 IsEmpty]: Start isEmpty. Operand 8297 states and 13188 transitions. [2021-11-21 01:07:11,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-11-21 01:07:11,145 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:07:11,145 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:07:11,187 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-21 01:07:11,360 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-21 01:07:11,360 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:07:11,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:07:11,361 INFO L85 PathProgramCache]: Analyzing trace with hash -796407116, now seen corresponding path program 1 times [2021-11-21 01:07:11,361 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:07:11,361 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [187460701] [2021-11-21 01:07:11,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:07:11,361 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:07:11,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:07:11,479 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 19 proven. 3 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-21 01:07:11,480 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:07:11,480 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [187460701] [2021-11-21 01:07:11,480 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [187460701] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:07:11,480 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1876022449] [2021-11-21 01:07:11,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:07:11,481 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:07:11,481 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:07:11,482 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:07:11,506 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-21 01:07:11,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:07:11,805 INFO L263 TraceCheckSpWp]: Trace formula consists of 1892 conjuncts, 23 conjunts are in the unsatisfiable core [2021-11-21 01:07:11,810 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:07:12,141 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 51 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-21 01:07:12,141 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:07:12,143 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1876022449] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:07:12,143 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:07:12,143 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [8] total 15 [2021-11-21 01:07:12,143 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1632493123] [2021-11-21 01:07:12,144 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:07:12,144 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-21 01:07:12,144 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:07:12,145 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-21 01:07:12,145 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=181, Unknown=0, NotChecked=0, Total=210 [2021-11-21 01:07:12,145 INFO L87 Difference]: Start difference. First operand 8297 states and 13188 transitions. Second operand has 9 states, 7 states have (on average 11.142857142857142) internal successors, (78), 7 states have internal predecessors, (78), 3 states have call successors, (23), 3 states have call predecessors, (23), 5 states have return successors, (21), 5 states have call predecessors, (21), 3 states have call successors, (21) [2021-11-21 01:07:13,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:07:13,696 INFO L93 Difference]: Finished difference Result 20700 states and 33321 transitions. [2021-11-21 01:07:13,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-21 01:07:13,697 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 11.142857142857142) internal successors, (78), 7 states have internal predecessors, (78), 3 states have call successors, (23), 3 states have call predecessors, (23), 5 states have return successors, (21), 5 states have call predecessors, (21), 3 states have call successors, (21) Word has length 125 [2021-11-21 01:07:13,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:07:13,801 INFO L225 Difference]: With dead ends: 20700 [2021-11-21 01:07:13,801 INFO L226 Difference]: Without dead ends: 13248 [2021-11-21 01:07:13,851 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2021-11-21 01:07:13,853 INFO L933 BasicCegarLoop]: 687 mSDtfsCounter, 653 mSDsluCounter, 4213 mSDsCounter, 0 mSdLazyCounter, 1176 mSolverCounterSat, 135 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 712 SdHoareTripleChecker+Valid, 4673 SdHoareTripleChecker+Invalid, 1311 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 135 IncrementalHoareTripleChecker+Valid, 1176 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-21 01:07:13,853 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [712 Valid, 4673 Invalid, 1311 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [135 Valid, 1176 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-21 01:07:13,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13248 states. [2021-11-21 01:07:14,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13248 to 11769. [2021-11-21 01:07:14,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11769 states, 7932 states have (on average 1.4747856782652546) internal successors, (11698), 8561 states have internal predecessors, (11698), 3063 states have call successors, (3063), 720 states have call predecessors, (3063), 773 states have return successors, (4197), 2979 states have call predecessors, (4197), 3046 states have call successors, (4197) [2021-11-21 01:07:14,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11769 states to 11769 states and 18958 transitions. [2021-11-21 01:07:14,896 INFO L78 Accepts]: Start accepts. Automaton has 11769 states and 18958 transitions. Word has length 125 [2021-11-21 01:07:14,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:07:14,896 INFO L470 AbstractCegarLoop]: Abstraction has 11769 states and 18958 transitions. [2021-11-21 01:07:14,897 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 11.142857142857142) internal successors, (78), 7 states have internal predecessors, (78), 3 states have call successors, (23), 3 states have call predecessors, (23), 5 states have return successors, (21), 5 states have call predecessors, (21), 3 states have call successors, (21) [2021-11-21 01:07:14,897 INFO L276 IsEmpty]: Start isEmpty. Operand 11769 states and 18958 transitions. [2021-11-21 01:07:14,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-11-21 01:07:14,915 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:07:14,915 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:07:14,955 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-21 01:07:15,141 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-21 01:07:15,141 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:07:15,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:07:15,142 INFO L85 PathProgramCache]: Analyzing trace with hash -684200179, now seen corresponding path program 1 times [2021-11-21 01:07:15,142 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:07:15,142 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1980076937] [2021-11-21 01:07:15,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:07:15,143 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:07:15,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:07:15,285 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 25 proven. 3 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-21 01:07:15,285 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:07:15,285 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1980076937] [2021-11-21 01:07:15,286 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1980076937] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:07:15,286 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [548393354] [2021-11-21 01:07:15,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:07:15,286 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:07:15,286 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:07:15,289 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:07:15,310 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-21 01:07:15,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:07:15,652 INFO L263 TraceCheckSpWp]: Trace formula consists of 1905 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-21 01:07:15,659 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:07:16,069 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 55 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-21 01:07:16,070 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:07:16,545 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 29 proven. 2 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-21 01:07:16,546 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [548393354] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:07:16,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [39803221] [2021-11-21 01:07:16,573 INFO L159 IcfgInterpreter]: Started Sifa with 79 locations of interest [2021-11-21 01:07:16,573 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:07:16,578 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:07:16,585 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:07:16,585 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:08:42,447 INFO L197 IcfgInterpreter]: Interpreting procedure timeShift with input of size 676 for LOIs [2021-11-21 01:13:37,449 INFO L197 IcfgInterpreter]: Interpreting procedure __automaton_fail with input of size 38 for LOIs [2021-11-21 01:13:37,501 INFO L197 IcfgInterpreter]: Interpreting procedure stopRequestedInDirection with input of size 42 for LOIs [2021-11-21 01:13:40,213 INFO L197 IcfgInterpreter]: Interpreting procedure isTopFloor with input of size 36 for LOIs [2021-11-21 01:13:40,312 INFO L197 IcfgInterpreter]: Interpreting procedure isFloorCalling with input of size 448 for LOIs [2021-11-21 01:13:44,410 INFO L197 IcfgInterpreter]: Interpreting procedure buttonForFloorIsPressed with input of size 445 for LOIs [2021-11-21 01:13:47,480 INFO L197 IcfgInterpreter]: Interpreting procedure initTopDown with input of size 595 for LOIs [2021-11-21 01:14:25,824 INFO L197 IcfgInterpreter]: Interpreting procedure initFloors with input of size 569 for LOIs [2021-11-21 01:14:30,271 INFO L197 IcfgInterpreter]: Interpreting procedure continueInDirection with input of size 50 for LOIs [2021-11-21 01:14:30,577 INFO L197 IcfgInterpreter]: Interpreting procedure getCurrentHeading with input of size 30 for LOIs [2021-11-21 01:14:30,625 INFO L197 IcfgInterpreter]: Interpreting procedure bobCall with input of size 569 for LOIs [2021-11-21 01:15:34,008 INFO L197 IcfgInterpreter]: Interpreting procedure initPersonOnFloor with input of size 590 for LOIs [2021-11-21 01:15:41,450 INFO L197 IcfgInterpreter]: Interpreting procedure getOrigin with input of size 501 for LOIs [2021-11-21 01:15:44,443 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:16:08,687 WARN L227 SmtUtils]: Spent 5.81s on a formula simplification. DAG size of input: 641 DAG size of output: 588 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 01:16:34,861 WARN L227 SmtUtils]: Spent 12.59s on a formula simplification. DAG size of input: 676 DAG size of output: 584 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 01:16:40,918 WARN L227 SmtUtils]: Spent 5.33s on a formula simplification that was a NOOP. DAG size: 596 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 01:16:54,923 WARN L227 SmtUtils]: Spent 12.70s on a formula simplification. DAG size of input: 636 DAG size of output: 599 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 01:17:02,672 WARN L227 SmtUtils]: Spent 6.63s on a formula simplification that was a NOOP. DAG size: 598 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 01:17:09,785 WARN L227 SmtUtils]: Spent 5.90s on a formula simplification that was a NOOP. DAG size: 594 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 01:17:26,837 WARN L227 SmtUtils]: Spent 11.74s on a formula simplification. DAG size of input: 633 DAG size of output: 597 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 01:17:33,478 WARN L227 SmtUtils]: Spent 5.53s on a formula simplification that was a NOOP. DAG size: 596 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 01:18:05,652 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:18:05,652 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:18:05,652 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 19 [2021-11-21 01:18:05,652 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1016267552] [2021-11-21 01:18:05,652 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:18:05,653 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-21 01:18:05,654 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:18:05,654 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-21 01:18:05,656 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=508, Invalid=5344, Unknown=0, NotChecked=0, Total=5852 [2021-11-21 01:18:05,657 INFO L87 Difference]: Start difference. First operand 11769 states and 18958 transitions. Second operand has 19 states, 16 states have (on average 7.875) internal successors, (126), 16 states have internal predecessors, (126), 8 states have call successors, (49), 4 states have call predecessors, (49), 10 states have return successors, (48), 11 states have call predecessors, (48), 8 states have call successors, (48) [2021-11-21 01:18:23,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:18:23,426 INFO L93 Difference]: Finished difference Result 55866 states and 98541 transitions. [2021-11-21 01:18:23,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2021-11-21 01:18:23,426 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 16 states have (on average 7.875) internal successors, (126), 16 states have internal predecessors, (126), 8 states have call successors, (49), 4 states have call predecessors, (49), 10 states have return successors, (48), 11 states have call predecessors, (48), 8 states have call successors, (48) Word has length 127 [2021-11-21 01:18:23,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:18:23,762 INFO L225 Difference]: With dead ends: 55866 [2021-11-21 01:18:23,762 INFO L226 Difference]: Without dead ends: 39176 [2021-11-21 01:18:24,022 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 512 GetRequests, 337 SyntacticMatches, 9 SemanticMatches, 166 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11467 ImplicationChecksByTransitivity, 143.7s TimeCoverageRelationStatistics Valid=1606, Invalid=26450, Unknown=0, NotChecked=0, Total=28056 [2021-11-21 01:18:24,023 INFO L933 BasicCegarLoop]: 1252 mSDtfsCounter, 6028 mSDsluCounter, 7875 mSDsCounter, 0 mSdLazyCounter, 19532 mSolverCounterSat, 4008 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6180 SdHoareTripleChecker+Valid, 8674 SdHoareTripleChecker+Invalid, 23540 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 4008 IncrementalHoareTripleChecker+Valid, 19532 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:18:24,024 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6180 Valid, 8674 Invalid, 23540 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [4008 Valid, 19532 Invalid, 0 Unknown, 0 Unchecked, 12.3s Time] [2021-11-21 01:18:24,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39176 states. [2021-11-21 01:18:27,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39176 to 30596. [2021-11-21 01:18:27,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30596 states, 20767 states have (on average 1.4646313863340876) internal successors, (30416), 22626 states have internal predecessors, (30416), 7923 states have call successors, (7923), 1659 states have call predecessors, (7923), 1905 states have return successors, (12987), 7322 states have call predecessors, (12987), 7895 states have call successors, (12987) [2021-11-21 01:18:27,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30596 states to 30596 states and 51326 transitions. [2021-11-21 01:18:27,869 INFO L78 Accepts]: Start accepts. Automaton has 30596 states and 51326 transitions. Word has length 127 [2021-11-21 01:18:27,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:18:27,870 INFO L470 AbstractCegarLoop]: Abstraction has 30596 states and 51326 transitions. [2021-11-21 01:18:27,870 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 16 states have (on average 7.875) internal successors, (126), 16 states have internal predecessors, (126), 8 states have call successors, (49), 4 states have call predecessors, (49), 10 states have return successors, (48), 11 states have call predecessors, (48), 8 states have call successors, (48) [2021-11-21 01:18:27,870 INFO L276 IsEmpty]: Start isEmpty. Operand 30596 states and 51326 transitions. [2021-11-21 01:18:27,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-21 01:18:27,895 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:18:27,895 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:18:27,944 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-21 01:18:28,121 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-21 01:18:28,121 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:18:28,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:18:28,122 INFO L85 PathProgramCache]: Analyzing trace with hash 796176557, now seen corresponding path program 1 times [2021-11-21 01:18:28,122 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:18:28,122 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [490174254] [2021-11-21 01:18:28,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:18:28,122 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:18:28,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:18:28,345 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-21 01:18:28,345 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:18:28,346 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [490174254] [2021-11-21 01:18:28,346 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [490174254] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:18:28,346 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1828367082] [2021-11-21 01:18:28,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:18:28,347 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:18:28,347 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:18:28,349 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:18:28,377 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-21 01:18:28,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:18:28,736 INFO L263 TraceCheckSpWp]: Trace formula consists of 1708 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 01:18:28,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:18:29,041 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-21 01:18:29,041 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:18:29,041 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1828367082] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:18:29,041 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:18:29,041 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [10] total 12 [2021-11-21 01:18:29,041 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [196850699] [2021-11-21 01:18:29,042 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:18:29,042 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:18:29,042 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:18:29,043 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:18:29,043 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2021-11-21 01:18:29,044 INFO L87 Difference]: Start difference. First operand 30596 states and 51326 transitions. Second operand has 4 states, 4 states have (on average 20.5) internal successors, (82), 4 states have internal predecessors, (82), 4 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (22), 4 states have call predecessors, (22), 4 states have call successors, (22) [2021-11-21 01:18:32,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:18:32,048 INFO L93 Difference]: Finished difference Result 61840 states and 106531 transitions. [2021-11-21 01:18:32,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 01:18:32,049 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), 4 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (22), 4 states have call predecessors, (22), 4 states have call successors, (22) Word has length 136 [2021-11-21 01:18:32,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:18:32,310 INFO L225 Difference]: With dead ends: 61840 [2021-11-21 01:18:32,310 INFO L226 Difference]: Without dead ends: 28547 [2021-11-21 01:18:32,828 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2021-11-21 01:18:32,828 INFO L933 BasicCegarLoop]: 607 mSDtfsCounter, 180 mSDsluCounter, 1006 mSDsCounter, 0 mSdLazyCounter, 157 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 190 SdHoareTripleChecker+Valid, 1551 SdHoareTripleChecker+Invalid, 178 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:18:32,829 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [190 Valid, 1551 Invalid, 178 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 157 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:18:32,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28547 states. [2021-11-21 01:18:35,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28547 to 28490. [2021-11-21 01:18:35,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28490 states, 19021 states have (on average 1.4515535460806477) internal successors, (27610), 20855 states have internal predecessors, (27610), 7636 states have call successors, (7636), 1614 states have call predecessors, (7636), 1832 states have return successors, (12346), 7032 states have call predecessors, (12346), 7608 states have call successors, (12346) [2021-11-21 01:18:35,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28490 states to 28490 states and 47592 transitions. [2021-11-21 01:18:35,716 INFO L78 Accepts]: Start accepts. Automaton has 28490 states and 47592 transitions. Word has length 136 [2021-11-21 01:18:35,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:18:35,717 INFO L470 AbstractCegarLoop]: Abstraction has 28490 states and 47592 transitions. [2021-11-21 01:18:35,717 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), 4 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (22), 4 states have call predecessors, (22), 4 states have call successors, (22) [2021-11-21 01:18:35,717 INFO L276 IsEmpty]: Start isEmpty. Operand 28490 states and 47592 transitions. [2021-11-21 01:18:35,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-21 01:18:35,753 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:18:35,753 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:18:35,804 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-21 01:18:35,981 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-21 01:18:35,981 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:18:35,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:18:35,982 INFO L85 PathProgramCache]: Analyzing trace with hash -1304544567, now seen corresponding path program 1 times [2021-11-21 01:18:35,982 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:18:35,982 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1514305434] [2021-11-21 01:18:35,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:18:35,983 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:18:36,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:18:36,206 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-21 01:18:36,206 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:18:36,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1514305434] [2021-11-21 01:18:36,207 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1514305434] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:18:36,207 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [866821337] [2021-11-21 01:18:36,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:18:36,208 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:18:36,208 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:18:36,213 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:18:36,236 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e0372017-af22-43c9-8e38-f91363ca6a57/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-21 01:18:36,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:18:36,621 INFO L263 TraceCheckSpWp]: Trace formula consists of 1712 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-21 01:18:36,632 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:18:37,188 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 20 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 01:18:37,189 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:18:38,070 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-21 01:18:38,070 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [866821337] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:18:38,071 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1502433245] [2021-11-21 01:18:38,083 INFO L159 IcfgInterpreter]: Started Sifa with 119 locations of interest [2021-11-21 01:18:38,083 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:18:38,084 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:18:38,085 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:18:38,085 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs