./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/elevator_spec9_product32.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/elevator_spec9_product32.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V --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 6f20249a191004f50add5285446ee5ffba043f1ff9b40e0e115c641082e595e2 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 03:53:52,629 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 03:53:52,631 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 03:53:52,692 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 03:53:52,693 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 03:53:52,697 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 03:53:52,700 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 03:53:52,704 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 03:53:52,706 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 03:53:52,711 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 03:53:52,712 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 03:53:52,714 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 03:53:52,715 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 03:53:52,717 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 03:53:52,719 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 03:53:52,723 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 03:53:52,725 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 03:53:52,726 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 03:53:52,728 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 03:53:52,738 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 03:53:52,740 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 03:53:52,741 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 03:53:52,744 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 03:53:52,745 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 03:53:52,748 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 03:53:52,749 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 03:53:52,749 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 03:53:52,751 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 03:53:52,751 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 03:53:52,753 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 03:53:52,753 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 03:53:52,754 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 03:53:52,756 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 03:53:52,757 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 03:53:52,758 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 03:53:52,758 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 03:53:52,759 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 03:53:52,759 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 03:53:52,759 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 03:53:52,760 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 03:53:52,761 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 03:53:52,761 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 03:53:52,807 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 03:53:52,807 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 03:53:52,808 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 03:53:52,808 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 03:53:52,809 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 03:53:52,815 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 03:53:52,815 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 03:53:52,816 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 03:53:52,816 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 03:53:52,816 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 03:53:52,817 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 03:53:52,817 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 03:53:52,817 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 03:53:52,818 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 03:53:52,818 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 03:53:52,818 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 03:53:52,818 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 03:53:52,818 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 03:53:52,819 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 03:53:52,819 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 03:53:52,820 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 03:53:52,820 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 03:53:52,820 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 03:53:52,820 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 03:53:52,820 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 03:53:52,820 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 03:53:52,822 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 03:53:52,822 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 03:53:52,822 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 03:53:52,823 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 03:53:52,823 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 03:53:52,823 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 03:53:52,823 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:53:52,824 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 03:53:52,824 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 03:53:52,824 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 03:53:52,824 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 03:53:52,824 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 03:53:52,825 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 03:53:52,825 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 03:53:52,825 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 03:53:52,825 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_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 6f20249a191004f50add5285446ee5ffba043f1ff9b40e0e115c641082e595e2 [2021-11-23 03:53:53,123 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 03:53:53,161 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 03:53:53,164 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 03:53:53,165 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 03:53:53,166 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 03:53:53,167 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/product-lines/elevator_spec9_product32.cil.c [2021-11-23 03:53:53,238 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/data/93ef90328/7438c98340be40bbad5435dd2abd805c/FLAGf87022146 [2021-11-23 03:53:53,929 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 03:53:53,930 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/sv-benchmarks/c/product-lines/elevator_spec9_product32.cil.c [2021-11-23 03:53:53,961 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/data/93ef90328/7438c98340be40bbad5435dd2abd805c/FLAGf87022146 [2021-11-23 03:53:54,156 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/data/93ef90328/7438c98340be40bbad5435dd2abd805c [2021-11-23 03:53:54,158 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 03:53:54,159 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 03:53:54,161 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 03:53:54,161 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 03:53:54,164 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 03:53:54,165 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:53:54" (1/1) ... [2021-11-23 03:53:54,166 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@68ed40d6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:53:54, skipping insertion in model container [2021-11-23 03:53:54,166 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:53:54" (1/1) ... [2021-11-23 03:53:54,188 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 03:53:54,279 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 03:53:54,562 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_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/sv-benchmarks/c/product-lines/elevator_spec9_product32.cil.c[17414,17427] [2021-11-23 03:53:54,889 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:53:54,904 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 03:53:54,957 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_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/sv-benchmarks/c/product-lines/elevator_spec9_product32.cil.c[17414,17427] [2021-11-23 03:53:55,071 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:53:55,101 INFO L208 MainTranslator]: Completed translation [2021-11-23 03:53:55,102 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:53:55 WrapperNode [2021-11-23 03:53:55,102 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 03:53:55,103 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 03:53:55,103 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 03:53:55,103 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 03:53:55,111 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:53:55" (1/1) ... [2021-11-23 03:53:55,139 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:53:55" (1/1) ... [2021-11-23 03:53:55,207 INFO L137 Inliner]: procedures = 99, calls = 352, calls flagged for inlining = 28, calls inlined = 24, statements flattened = 934 [2021-11-23 03:53:55,207 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 03:53:55,208 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 03:53:55,208 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 03:53:55,208 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 03:53:55,216 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:53:55" (1/1) ... [2021-11-23 03:53:55,217 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:53:55" (1/1) ... [2021-11-23 03:53:55,222 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:53:55" (1/1) ... [2021-11-23 03:53:55,222 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:53:55" (1/1) ... [2021-11-23 03:53:55,248 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:53:55" (1/1) ... [2021-11-23 03:53:55,264 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:53:55" (1/1) ... [2021-11-23 03:53:55,272 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:53:55" (1/1) ... [2021-11-23 03:53:55,285 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 03:53:55,286 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 03:53:55,286 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 03:53:55,286 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 03:53:55,287 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:53:55" (1/1) ... [2021-11-23 03:53:55,295 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:53:55,308 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:53:55,332 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 03:53:55,349 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 03:53:55,371 INFO L130 BoogieDeclarations]: Found specification of procedure bigMacCall [2021-11-23 03:53:55,371 INFO L138 BoogieDeclarations]: Found implementation of procedure bigMacCall [2021-11-23 03:53:55,371 INFO L130 BoogieDeclarations]: Found specification of procedure enterElevator [2021-11-23 03:53:55,372 INFO L138 BoogieDeclarations]: Found implementation of procedure enterElevator [2021-11-23 03:53:55,372 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection [2021-11-23 03:53:55,372 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection [2021-11-23 03:53:55,372 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection__wrappee__empty [2021-11-23 03:53:55,372 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection__wrappee__empty [2021-11-23 03:53:55,373 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift [2021-11-23 03:53:55,373 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift [2021-11-23 03:53:55,373 INFO L130 BoogieDeclarations]: Found specification of procedure getDestination [2021-11-23 03:53:55,373 INFO L138 BoogieDeclarations]: Found implementation of procedure getDestination [2021-11-23 03:53:55,373 INFO L130 BoogieDeclarations]: Found specification of procedure isBlocked [2021-11-23 03:53:55,373 INFO L138 BoogieDeclarations]: Found implementation of procedure isBlocked [2021-11-23 03:53:55,374 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentFloorID [2021-11-23 03:53:55,374 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentFloorID [2021-11-23 03:53:55,374 INFO L130 BoogieDeclarations]: Found specification of procedure buttonForFloorIsPressed [2021-11-23 03:53:55,374 INFO L138 BoogieDeclarations]: Found implementation of procedure buttonForFloorIsPressed [2021-11-23 03:53:55,374 INFO L130 BoogieDeclarations]: Found specification of procedure pressInLiftFloorButton [2021-11-23 03:53:55,374 INFO L138 BoogieDeclarations]: Found implementation of procedure pressInLiftFloorButton [2021-11-23 03:53:55,375 INFO L130 BoogieDeclarations]: Found specification of procedure leaveElevator [2021-11-23 03:53:55,375 INFO L138 BoogieDeclarations]: Found implementation of procedure leaveElevator [2021-11-23 03:53:55,375 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 03:53:55,375 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedAtCurrentFloor__wrappee__twothirdsfull [2021-11-23 03:53:55,375 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedAtCurrentFloor__wrappee__twothirdsfull [2021-11-23 03:53:55,376 INFO L130 BoogieDeclarations]: Found specification of procedure getWeight [2021-11-23 03:53:55,376 INFO L138 BoogieDeclarations]: Found implementation of procedure getWeight [2021-11-23 03:53:55,376 INFO L130 BoogieDeclarations]: Found specification of procedure isExecutiveFloorCalling [2021-11-23 03:53:55,376 INFO L138 BoogieDeclarations]: Found implementation of procedure isExecutiveFloorCalling [2021-11-23 03:53:55,376 INFO L130 BoogieDeclarations]: Found specification of procedure getReverseHeading [2021-11-23 03:53:55,376 INFO L138 BoogieDeclarations]: Found implementation of procedure getReverseHeading [2021-11-23 03:53:55,377 INFO L130 BoogieDeclarations]: Found specification of procedure cleanup [2021-11-23 03:53:55,377 INFO L138 BoogieDeclarations]: Found implementation of procedure cleanup [2021-11-23 03:53:55,377 INFO L130 BoogieDeclarations]: Found specification of procedure areDoorsOpen [2021-11-23 03:53:55,377 INFO L138 BoogieDeclarations]: Found implementation of procedure areDoorsOpen [2021-11-23 03:53:55,377 INFO L130 BoogieDeclarations]: Found specification of procedure __automaton_fail [2021-11-23 03:53:55,377 INFO L138 BoogieDeclarations]: Found implementation of procedure __automaton_fail [2021-11-23 03:53:55,378 INFO L130 BoogieDeclarations]: Found specification of procedure isTopFloor [2021-11-23 03:53:55,378 INFO L138 BoogieDeclarations]: Found implementation of procedure isTopFloor [2021-11-23 03:53:55,378 INFO L130 BoogieDeclarations]: Found specification of procedure resetCallOnFloor [2021-11-23 03:53:55,378 INFO L138 BoogieDeclarations]: Found implementation of procedure resetCallOnFloor [2021-11-23 03:53:55,378 INFO L130 BoogieDeclarations]: Found specification of procedure initPersonOnFloor [2021-11-23 03:53:55,378 INFO L138 BoogieDeclarations]: Found implementation of procedure initPersonOnFloor [2021-11-23 03:53:55,379 INFO L130 BoogieDeclarations]: Found specification of procedure removePersonFromFloor [2021-11-23 03:53:55,379 INFO L138 BoogieDeclarations]: Found implementation of procedure removePersonFromFloor [2021-11-23 03:53:55,379 INFO L130 BoogieDeclarations]: Found specification of procedure getOrigin [2021-11-23 03:53:55,379 INFO L138 BoogieDeclarations]: Found implementation of procedure getOrigin [2021-11-23 03:53:55,379 INFO L130 BoogieDeclarations]: Found specification of procedure continueInDirection [2021-11-23 03:53:55,379 INFO L138 BoogieDeclarations]: Found implementation of procedure continueInDirection [2021-11-23 03:53:55,380 INFO L130 BoogieDeclarations]: Found specification of procedure isEmpty [2021-11-23 03:53:55,380 INFO L138 BoogieDeclarations]: Found implementation of procedure isEmpty [2021-11-23 03:53:55,380 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 03:53:55,380 INFO L130 BoogieDeclarations]: Found specification of procedure isPersonOnFloor [2021-11-23 03:53:55,380 INFO L138 BoogieDeclarations]: Found implementation of procedure isPersonOnFloor [2021-11-23 03:53:55,381 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 03:53:55,381 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 03:53:55,381 INFO L130 BoogieDeclarations]: Found specification of procedure isFloorCalling [2021-11-23 03:53:55,381 INFO L138 BoogieDeclarations]: Found implementation of procedure isFloorCalling [2021-11-23 03:53:55,381 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift__wrappee__executivefloor [2021-11-23 03:53:55,381 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift__wrappee__executivefloor [2021-11-23 03:53:55,528 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 03:53:55,530 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 03:53:56,741 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 03:53:57,399 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 03:53:57,399 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 03:53:57,404 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:53:57 BoogieIcfgContainer [2021-11-23 03:53:57,404 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 03:53:57,406 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 03:53:57,406 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 03:53:57,409 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 03:53:57,409 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 03:53:54" (1/3) ... [2021-11-23 03:53:57,410 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1d8c63cc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:53:57, skipping insertion in model container [2021-11-23 03:53:57,410 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:53:55" (2/3) ... [2021-11-23 03:53:57,411 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1d8c63cc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:53:57, skipping insertion in model container [2021-11-23 03:53:57,411 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:53:57" (3/3) ... [2021-11-23 03:53:57,445 INFO L111 eAbstractionObserver]: Analyzing ICFG elevator_spec9_product32.cil.c [2021-11-23 03:53:57,450 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 03:53:57,451 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 03:53:57,521 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 03:53:57,530 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 [2021-11-23 03:53:57,531 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 03:53:57,583 INFO L276 IsEmpty]: Start isEmpty. Operand has 401 states, 268 states have (on average 1.5671641791044777) internal successors, (420), 291 states have internal predecessors, (420), 103 states have call successors, (103), 28 states have call predecessors, (103), 28 states have return successors, (103), 96 states have call predecessors, (103), 103 states have call successors, (103) [2021-11-23 03:53:57,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-23 03:53:57,595 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:53:57,596 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:53:57,596 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:53:57,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:53:57,600 INFO L85 PathProgramCache]: Analyzing trace with hash 1796047711, now seen corresponding path program 1 times [2021-11-23 03:53:57,609 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:53:57,609 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [48912138] [2021-11-23 03:53:57,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:53:57,610 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:53:57,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:53:58,024 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:53:58,025 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:53:58,025 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [48912138] [2021-11-23 03:53:58,026 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [48912138] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:53:58,026 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:53:58,027 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 03:53:58,028 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [476853884] [2021-11-23 03:53:58,029 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:53:58,033 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-23 03:53:58,034 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:53:58,060 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-23 03:53:58,061 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 03:53:58,065 INFO L87 Difference]: Start difference. First operand has 401 states, 268 states have (on average 1.5671641791044777) internal successors, (420), 291 states have internal predecessors, (420), 103 states have call successors, (103), 28 states have call predecessors, (103), 28 states have return successors, (103), 96 states have call predecessors, (103), 103 states have call successors, (103) Second operand has 2 states, 2 states have (on average 13.0) internal successors, (26), 2 states have internal predecessors, (26), 2 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 1 states have call successors, (8) [2021-11-23 03:53:58,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:53:58,207 INFO L93 Difference]: Finished difference Result 419 states and 653 transitions. [2021-11-23 03:53:58,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-23 03:53:58,212 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 13.0) internal successors, (26), 2 states have internal predecessors, (26), 2 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 1 states have call successors, (8) Word has length 43 [2021-11-23 03:53:58,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:53:58,232 INFO L225 Difference]: With dead ends: 419 [2021-11-23 03:53:58,232 INFO L226 Difference]: Without dead ends: 397 [2021-11-23 03:53:58,236 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 03:53:58,239 INFO L933 BasicCegarLoop]: 579 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 579 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:53:58,240 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 579 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:53:58,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 397 states. [2021-11-23 03:53:58,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 397 to 397. [2021-11-23 03:53:58,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 397 states, 266 states have (on average 1.556390977443609) internal successors, (414), 287 states have internal predecessors, (414), 103 states have call successors, (103), 28 states have call predecessors, (103), 27 states have return successors, (98), 95 states have call predecessors, (98), 98 states have call successors, (98) [2021-11-23 03:53:58,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 397 states to 397 states and 615 transitions. [2021-11-23 03:53:58,329 INFO L78 Accepts]: Start accepts. Automaton has 397 states and 615 transitions. Word has length 43 [2021-11-23 03:53:58,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:53:58,331 INFO L470 AbstractCegarLoop]: Abstraction has 397 states and 615 transitions. [2021-11-23 03:53:58,331 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 13.0) internal successors, (26), 2 states have internal predecessors, (26), 2 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 1 states have call successors, (8) [2021-11-23 03:53:58,332 INFO L276 IsEmpty]: Start isEmpty. Operand 397 states and 615 transitions. [2021-11-23 03:53:58,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-23 03:53:58,335 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:53:58,336 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:53:58,336 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 03:53:58,336 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:53:58,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:53:58,341 INFO L85 PathProgramCache]: Analyzing trace with hash 1427098797, now seen corresponding path program 1 times [2021-11-23 03:53:58,341 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:53:58,341 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [570227941] [2021-11-23 03:53:58,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:53:58,342 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:53:58,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:53:58,597 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:53:58,598 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:53:58,598 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [570227941] [2021-11-23 03:53:58,599 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [570227941] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:53:58,599 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:53:58,600 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 03:53:58,600 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1851778213] [2021-11-23 03:53:58,600 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:53:58,602 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 03:53:58,603 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:53:58,603 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 03:53:58,604 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:53:58,604 INFO L87 Difference]: Start difference. First operand 397 states and 615 transitions. Second operand has 6 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 6 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-23 03:54:00,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:54:00,913 INFO L93 Difference]: Finished difference Result 1279 states and 2019 transitions. [2021-11-23 03:54:00,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 03:54:00,914 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 6 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) Word has length 44 [2021-11-23 03:54:00,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:54:00,923 INFO L225 Difference]: With dead ends: 1279 [2021-11-23 03:54:00,923 INFO L226 Difference]: Without dead ends: 898 [2021-11-23 03:54:00,928 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-23 03:54:00,930 INFO L933 BasicCegarLoop]: 581 mSDtfsCounter, 2009 mSDsluCounter, 520 mSDsCounter, 0 mSdLazyCounter, 1274 mSolverCounterSat, 828 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2080 SdHoareTripleChecker+Valid, 1074 SdHoareTripleChecker+Invalid, 2102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 828 IncrementalHoareTripleChecker+Valid, 1274 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:54:00,931 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2080 Valid, 1074 Invalid, 2102 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [828 Valid, 1274 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2021-11-23 03:54:00,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 898 states. [2021-11-23 03:54:01,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 898 to 801. [2021-11-23 03:54:01,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 801 states, 556 states have (on average 1.5719424460431655) internal successors, (874), 586 states have internal predecessors, (874), 193 states have call successors, (193), 50 states have call predecessors, (193), 51 states have return successors, (195), 177 states have call predecessors, (195), 188 states have call successors, (195) [2021-11-23 03:54:01,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 801 states to 801 states and 1262 transitions. [2021-11-23 03:54:01,019 INFO L78 Accepts]: Start accepts. Automaton has 801 states and 1262 transitions. Word has length 44 [2021-11-23 03:54:01,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:54:01,019 INFO L470 AbstractCegarLoop]: Abstraction has 801 states and 1262 transitions. [2021-11-23 03:54:01,020 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 6 states have call successors, (9), 4 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-23 03:54:01,020 INFO L276 IsEmpty]: Start isEmpty. Operand 801 states and 1262 transitions. [2021-11-23 03:54:01,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-23 03:54:01,029 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:54:01,030 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:54:01,030 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 03:54:01,031 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:54:01,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:54:01,031 INFO L85 PathProgramCache]: Analyzing trace with hash 442798330, now seen corresponding path program 1 times [2021-11-23 03:54:01,032 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:54:01,032 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2039609378] [2021-11-23 03:54:01,032 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:54:01,032 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:54:01,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:54:01,259 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 03:54:01,259 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:54:01,259 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2039609378] [2021-11-23 03:54:01,259 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2039609378] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:54:01,260 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:54:01,260 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-11-23 03:54:01,260 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [358513957] [2021-11-23 03:54:01,260 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:54:01,261 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-23 03:54:01,261 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:54:01,261 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-23 03:54:01,262 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-23 03:54:01,262 INFO L87 Difference]: Start difference. First operand 801 states and 1262 transitions. Second operand has 9 states, 7 states have (on average 6.714285714285714) internal successors, (47), 8 states have internal predecessors, (47), 5 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 5 states have call predecessors, (16), 4 states have call successors, (16) [2021-11-23 03:54:04,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:54:04,339 INFO L93 Difference]: Finished difference Result 2368 states and 3741 transitions. [2021-11-23 03:54:04,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 03:54:04,340 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 6.714285714285714) internal successors, (47), 8 states have internal predecessors, (47), 5 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 5 states have call predecessors, (16), 4 states have call successors, (16) Word has length 87 [2021-11-23 03:54:04,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:54:04,352 INFO L225 Difference]: With dead ends: 2368 [2021-11-23 03:54:04,352 INFO L226 Difference]: Without dead ends: 1583 [2021-11-23 03:54:04,357 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=90, Invalid=416, Unknown=0, NotChecked=0, Total=506 [2021-11-23 03:54:04,359 INFO L933 BasicCegarLoop]: 963 mSDtfsCounter, 989 mSDsluCounter, 2147 mSDsCounter, 0 mSdLazyCounter, 4739 mSolverCounterSat, 404 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1060 SdHoareTripleChecker+Valid, 2998 SdHoareTripleChecker+Invalid, 5143 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 404 IncrementalHoareTripleChecker+Valid, 4739 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2021-11-23 03:54:04,359 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1060 Valid, 2998 Invalid, 5143 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [404 Valid, 4739 Invalid, 0 Unknown, 0 Unchecked, 2.7s Time] [2021-11-23 03:54:04,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1583 states. [2021-11-23 03:54:04,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1583 to 1555. [2021-11-23 03:54:04,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1555 states, 1075 states have (on average 1.5562790697674418) internal successors, (1673), 1126 states have internal predecessors, (1673), 378 states have call successors, (378), 90 states have call predecessors, (378), 101 states have return successors, (397), 360 states have call predecessors, (397), 373 states have call successors, (397) [2021-11-23 03:54:04,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1555 states to 1555 states and 2448 transitions. [2021-11-23 03:54:04,475 INFO L78 Accepts]: Start accepts. Automaton has 1555 states and 2448 transitions. Word has length 87 [2021-11-23 03:54:04,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:54:04,476 INFO L470 AbstractCegarLoop]: Abstraction has 1555 states and 2448 transitions. [2021-11-23 03:54:04,476 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 6.714285714285714) internal successors, (47), 8 states have internal predecessors, (47), 5 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 5 states have call predecessors, (16), 4 states have call successors, (16) [2021-11-23 03:54:04,477 INFO L276 IsEmpty]: Start isEmpty. Operand 1555 states and 2448 transitions. [2021-11-23 03:54:04,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-11-23 03:54:04,480 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:54:04,481 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:54:04,481 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-23 03:54:04,481 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:54:04,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:54:04,482 INFO L85 PathProgramCache]: Analyzing trace with hash 96065586, now seen corresponding path program 1 times [2021-11-23 03:54:04,483 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:54:04,483 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1970163545] [2021-11-23 03:54:04,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:54:04,483 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:54:04,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:54:04,617 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 03:54:04,617 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:54:04,618 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1970163545] [2021-11-23 03:54:04,618 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1970163545] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:54:04,618 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:54:04,618 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-23 03:54:04,619 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [145637590] [2021-11-23 03:54:04,619 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:54:04,620 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 03:54:04,621 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:54:04,622 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 03:54:04,622 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:54:04,626 INFO L87 Difference]: Start difference. First operand 1555 states and 2448 transitions. Second operand has 7 states, 7 states have (on average 6.857142857142857) internal successors, (48), 7 states have internal predecessors, (48), 5 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 5 states have call predecessors, (16), 4 states have call successors, (16) [2021-11-23 03:54:06,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:54:06,665 INFO L93 Difference]: Finished difference Result 4007 states and 6318 transitions. [2021-11-23 03:54:06,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 03:54:06,666 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 6.857142857142857) internal successors, (48), 7 states have internal predecessors, (48), 5 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 5 states have call predecessors, (16), 4 states have call successors, (16) Word has length 88 [2021-11-23 03:54:06,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:54:06,686 INFO L225 Difference]: With dead ends: 4007 [2021-11-23 03:54:06,687 INFO L226 Difference]: Without dead ends: 2470 [2021-11-23 03:54:06,696 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2021-11-23 03:54:06,697 INFO L933 BasicCegarLoop]: 601 mSDtfsCounter, 1166 mSDsluCounter, 1242 mSDsCounter, 0 mSdLazyCounter, 2358 mSolverCounterSat, 476 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1243 SdHoareTripleChecker+Valid, 1768 SdHoareTripleChecker+Invalid, 2834 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 476 IncrementalHoareTripleChecker+Valid, 2358 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2021-11-23 03:54:06,698 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1243 Valid, 1768 Invalid, 2834 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [476 Valid, 2358 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2021-11-23 03:54:06,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2470 states. [2021-11-23 03:54:06,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2470 to 2397. [2021-11-23 03:54:06,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2397 states, 1667 states have (on average 1.5590881823635272) internal successors, (2599), 1745 states have internal predecessors, (2599), 563 states have call successors, (563), 147 states have call predecessors, (563), 166 states have return successors, (608), 537 states have call predecessors, (608), 558 states have call successors, (608) [2021-11-23 03:54:06,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2397 states to 2397 states and 3770 transitions. [2021-11-23 03:54:06,871 INFO L78 Accepts]: Start accepts. Automaton has 2397 states and 3770 transitions. Word has length 88 [2021-11-23 03:54:06,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:54:06,872 INFO L470 AbstractCegarLoop]: Abstraction has 2397 states and 3770 transitions. [2021-11-23 03:54:06,872 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 6.857142857142857) internal successors, (48), 7 states have internal predecessors, (48), 5 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (16), 5 states have call predecessors, (16), 4 states have call successors, (16) [2021-11-23 03:54:06,873 INFO L276 IsEmpty]: Start isEmpty. Operand 2397 states and 3770 transitions. [2021-11-23 03:54:06,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-11-23 03:54:06,876 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:54:06,876 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:54:06,877 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-23 03:54:06,877 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:54:06,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:54:06,878 INFO L85 PathProgramCache]: Analyzing trace with hash 763407716, now seen corresponding path program 1 times [2021-11-23 03:54:06,878 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:54:06,878 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1607323511] [2021-11-23 03:54:06,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:54:06,879 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:54:06,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:54:07,005 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 03:54:07,005 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:54:07,005 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1607323511] [2021-11-23 03:54:07,006 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1607323511] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:54:07,006 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:54:07,006 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:54:07,006 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1254467581] [2021-11-23 03:54:07,007 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:54:07,007 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:54:07,007 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:54:07,008 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:54:07,008 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:54:07,008 INFO L87 Difference]: Start difference. First operand 2397 states and 3770 transitions. Second operand has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-23 03:54:07,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:54:07,311 INFO L93 Difference]: Finished difference Result 6096 states and 9653 transitions. [2021-11-23 03:54:07,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:54:07,312 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) Word has length 92 [2021-11-23 03:54:07,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:54:07,345 INFO L225 Difference]: With dead ends: 6096 [2021-11-23 03:54:07,345 INFO L226 Difference]: Without dead ends: 3715 [2021-11-23 03:54:07,359 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:54:07,361 INFO L933 BasicCegarLoop]: 702 mSDtfsCounter, 579 mSDsluCounter, 591 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 579 SdHoareTripleChecker+Valid, 1260 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:54:07,361 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [579 Valid, 1260 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:54:07,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3715 states. [2021-11-23 03:54:07,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3715 to 3675. [2021-11-23 03:54:07,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3675 states, 2563 states have (on average 1.554818571985954) internal successors, (3985), 2688 states have internal predecessors, (3985), 857 states have call successors, (857), 221 states have call predecessors, (857), 254 states have return successors, (956), 813 states have call predecessors, (956), 852 states have call successors, (956) [2021-11-23 03:54:07,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3675 states to 3675 states and 5798 transitions. [2021-11-23 03:54:07,673 INFO L78 Accepts]: Start accepts. Automaton has 3675 states and 5798 transitions. Word has length 92 [2021-11-23 03:54:07,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:54:07,674 INFO L470 AbstractCegarLoop]: Abstraction has 3675 states and 5798 transitions. [2021-11-23 03:54:07,675 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-23 03:54:07,675 INFO L276 IsEmpty]: Start isEmpty. Operand 3675 states and 5798 transitions. [2021-11-23 03:54:07,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-11-23 03:54:07,679 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:54:07,679 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:54:07,679 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-23 03:54:07,680 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:54:07,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:54:07,680 INFO L85 PathProgramCache]: Analyzing trace with hash -2104452940, now seen corresponding path program 1 times [2021-11-23 03:54:07,681 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:54:07,681 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [831086283] [2021-11-23 03:54:07,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:54:07,681 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:54:07,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:54:07,787 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 03:54:07,788 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:54:07,788 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [831086283] [2021-11-23 03:54:07,788 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [831086283] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:54:07,789 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:54:07,789 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:54:07,789 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [21847581] [2021-11-23 03:54:07,789 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:54:07,790 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:54:07,790 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:54:07,790 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:54:07,791 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:54:07,791 INFO L87 Difference]: Start difference. First operand 3675 states and 5798 transitions. Second operand has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-23 03:54:08,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:54:08,188 INFO L93 Difference]: Finished difference Result 9931 states and 15810 transitions. [2021-11-23 03:54:08,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:54:08,189 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) Word has length 93 [2021-11-23 03:54:08,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:54:08,292 INFO L225 Difference]: With dead ends: 9931 [2021-11-23 03:54:08,293 INFO L226 Difference]: Without dead ends: 6273 [2021-11-23 03:54:08,313 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:54:08,314 INFO L933 BasicCegarLoop]: 705 mSDtfsCounter, 578 mSDsluCounter, 594 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 578 SdHoareTripleChecker+Valid, 1266 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:54:08,315 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [578 Valid, 1266 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:54:08,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6273 states. [2021-11-23 03:54:08,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6273 to 6232. [2021-11-23 03:54:08,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6232 states, 4356 states have (on average 1.5509641873278237) internal successors, (6756), 4575 states have internal predecessors, (6756), 1445 states have call successors, (1445), 369 states have call predecessors, (1445), 430 states have return successors, (1690), 1365 states have call predecessors, (1690), 1440 states have call successors, (1690) [2021-11-23 03:54:08,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6232 states to 6232 states and 9891 transitions. [2021-11-23 03:54:08,748 INFO L78 Accepts]: Start accepts. Automaton has 6232 states and 9891 transitions. Word has length 93 [2021-11-23 03:54:08,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:54:08,749 INFO L470 AbstractCegarLoop]: Abstraction has 6232 states and 9891 transitions. [2021-11-23 03:54:08,749 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-23 03:54:08,749 INFO L276 IsEmpty]: Start isEmpty. Operand 6232 states and 9891 transitions. [2021-11-23 03:54:08,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-23 03:54:08,753 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:54:08,753 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:54:08,753 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-23 03:54:08,754 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:54:08,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:54:08,754 INFO L85 PathProgramCache]: Analyzing trace with hash -813816154, now seen corresponding path program 1 times [2021-11-23 03:54:08,755 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:54:08,755 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1931008318] [2021-11-23 03:54:08,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:54:08,755 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:54:08,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:54:08,894 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 03:54:08,895 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:54:08,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1931008318] [2021-11-23 03:54:08,895 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1931008318] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:54:08,895 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:54:08,896 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:54:08,897 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1930374297] [2021-11-23 03:54:08,899 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:54:08,899 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:54:08,900 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:54:08,900 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:54:08,900 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:54:08,901 INFO L87 Difference]: Start difference. First operand 6232 states and 9891 transitions. Second operand has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-23 03:54:09,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:54:09,581 INFO L93 Difference]: Finished difference Result 17602 states and 28334 transitions. [2021-11-23 03:54:09,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:54:09,582 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) Word has length 94 [2021-11-23 03:54:09,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:54:09,689 INFO L225 Difference]: With dead ends: 17602 [2021-11-23 03:54:09,689 INFO L226 Difference]: Without dead ends: 11389 [2021-11-23 03:54:09,729 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:54:09,730 INFO L933 BasicCegarLoop]: 708 mSDtfsCounter, 577 mSDsluCounter, 597 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 577 SdHoareTripleChecker+Valid, 1272 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:54:09,731 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [577 Valid, 1272 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:54:09,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11389 states. [2021-11-23 03:54:10,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11389 to 11347. [2021-11-23 03:54:10,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11347 states, 7943 states have (on average 1.547022535565907) internal successors, (12288), 8350 states have internal predecessors, (12288), 2621 states have call successors, (2621), 665 states have call predecessors, (2621), 782 states have return successors, (3314), 2469 states have call predecessors, (3314), 2616 states have call successors, (3314) [2021-11-23 03:54:10,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11347 states to 11347 states and 18223 transitions. [2021-11-23 03:54:10,673 INFO L78 Accepts]: Start accepts. Automaton has 11347 states and 18223 transitions. Word has length 94 [2021-11-23 03:54:10,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:54:10,673 INFO L470 AbstractCegarLoop]: Abstraction has 11347 states and 18223 transitions. [2021-11-23 03:54:10,674 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.333333333333332) internal successors, (52), 3 states have internal predecessors, (52), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-23 03:54:10,675 INFO L276 IsEmpty]: Start isEmpty. Operand 11347 states and 18223 transitions. [2021-11-23 03:54:10,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-23 03:54:10,679 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:54:10,679 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:54:10,679 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-23 03:54:10,679 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:54:10,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:54:10,681 INFO L85 PathProgramCache]: Analyzing trace with hash 541222454, now seen corresponding path program 1 times [2021-11-23 03:54:10,681 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:54:10,681 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [496992763] [2021-11-23 03:54:10,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:54:10,682 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:54:10,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:54:10,792 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 03:54:10,793 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:54:10,793 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [496992763] [2021-11-23 03:54:10,793 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [496992763] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:54:10,793 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:54:10,794 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:54:10,794 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [485923292] [2021-11-23 03:54:10,794 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:54:10,794 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:54:10,795 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:54:10,795 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:54:10,795 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:54:10,795 INFO L87 Difference]: Start difference. First operand 11347 states and 18223 transitions. Second operand has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-23 03:54:11,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:54:11,884 INFO L93 Difference]: Finished difference Result 32945 states and 54147 transitions. [2021-11-23 03:54:11,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:54:11,885 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) Word has length 95 [2021-11-23 03:54:11,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:54:12,043 INFO L225 Difference]: With dead ends: 32945 [2021-11-23 03:54:12,043 INFO L226 Difference]: Without dead ends: 21621 [2021-11-23 03:54:12,101 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:54:12,102 INFO L933 BasicCegarLoop]: 711 mSDtfsCounter, 576 mSDsluCounter, 600 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 576 SdHoareTripleChecker+Valid, 1278 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:54:12,102 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [576 Valid, 1278 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:54:12,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21621 states. [2021-11-23 03:54:13,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21621 to 21578. [2021-11-23 03:54:13,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21578 states, 15118 states have (on average 1.5427966662256913) internal successors, (23324), 15901 states have internal predecessors, (23324), 4973 states have call successors, (4973), 1257 states have call predecessors, (4973), 1486 states have return successors, (7126), 4677 states have call predecessors, (7126), 4968 states have call successors, (7126) [2021-11-23 03:54:13,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21578 states to 21578 states and 35423 transitions. [2021-11-23 03:54:13,778 INFO L78 Accepts]: Start accepts. Automaton has 21578 states and 35423 transitions. Word has length 95 [2021-11-23 03:54:13,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:54:13,779 INFO L470 AbstractCegarLoop]: Abstraction has 21578 states and 35423 transitions. [2021-11-23 03:54:13,779 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-23 03:54:13,780 INFO L276 IsEmpty]: Start isEmpty. Operand 21578 states and 35423 transitions. [2021-11-23 03:54:13,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-23 03:54:13,784 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:54:13,784 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:54:13,785 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-23 03:54:13,785 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:54:13,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:54:13,786 INFO L85 PathProgramCache]: Analyzing trace with hash -402249752, now seen corresponding path program 1 times [2021-11-23 03:54:13,786 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:54:13,786 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1718252891] [2021-11-23 03:54:13,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:54:13,787 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:54:13,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:54:13,887 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 03:54:13,888 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:54:13,888 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1718252891] [2021-11-23 03:54:13,888 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1718252891] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:54:13,888 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:54:13,888 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:54:13,889 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [832489323] [2021-11-23 03:54:13,889 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:54:13,890 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:54:13,890 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:54:13,890 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:54:13,891 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:54:13,891 INFO L87 Difference]: Start difference. First operand 21578 states and 35423 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-23 03:54:14,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:54:14,893 INFO L93 Difference]: Finished difference Result 22901 states and 37759 transitions. [2021-11-23 03:54:14,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:54:14,894 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) Word has length 96 [2021-11-23 03:54:14,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:54:15,035 INFO L225 Difference]: With dead ends: 22901 [2021-11-23 03:54:15,035 INFO L226 Difference]: Without dead ends: 22890 [2021-11-23 03:54:15,046 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:54:15,047 INFO L933 BasicCegarLoop]: 704 mSDtfsCounter, 562 mSDsluCounter, 604 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 562 SdHoareTripleChecker+Valid, 1276 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:54:15,048 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [562 Valid, 1276 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:54:15,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22890 states. [2021-11-23 03:54:16,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22890 to 22852. [2021-11-23 03:54:16,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22852 states, 16011 states have (on average 1.5406907750921242) internal successors, (24668), 16841 states have internal predecessors, (24668), 5267 states have call successors, (5267), 1331 states have call predecessors, (5267), 1573 states have return successors, (7740), 4952 states have call predecessors, (7740), 5262 states have call successors, (7740) [2021-11-23 03:54:16,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22852 states to 22852 states and 37675 transitions. [2021-11-23 03:54:16,584 INFO L78 Accepts]: Start accepts. Automaton has 22852 states and 37675 transitions. Word has length 96 [2021-11-23 03:54:16,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:54:16,584 INFO L470 AbstractCegarLoop]: Abstraction has 22852 states and 37675 transitions. [2021-11-23 03:54:16,585 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (17), 2 states have call predecessors, (17), 1 states have call successors, (17) [2021-11-23 03:54:16,585 INFO L276 IsEmpty]: Start isEmpty. Operand 22852 states and 37675 transitions. [2021-11-23 03:54:16,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-11-23 03:54:16,596 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:54:16,597 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:54:16,597 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-23 03:54:16,597 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:54:16,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:54:16,598 INFO L85 PathProgramCache]: Analyzing trace with hash 829380609, now seen corresponding path program 1 times [2021-11-23 03:54:16,599 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:54:16,599 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1186285643] [2021-11-23 03:54:16,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:54:16,599 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:54:16,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:54:16,718 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-11-23 03:54:16,718 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:54:16,719 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1186285643] [2021-11-23 03:54:16,719 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1186285643] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:54:16,719 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:54:16,719 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:54:16,719 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1097584825] [2021-11-23 03:54:16,720 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:54:16,720 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:54:16,720 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:54:16,721 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:54:16,721 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:54:16,722 INFO L87 Difference]: Start difference. First operand 22852 states and 37675 transitions. Second operand has 4 states, 4 states have (on average 18.25) internal successors, (73), 4 states have internal predecessors, (73), 2 states have call successors, (27), 2 states have call predecessors, (27), 2 states have return successors, (26), 2 states have call predecessors, (26), 2 states have call successors, (26) [2021-11-23 03:54:18,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:54:18,287 INFO L93 Difference]: Finished difference Result 46569 states and 78641 transitions. [2021-11-23 03:54:18,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:54:18,288 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.25) internal successors, (73), 4 states have internal predecessors, (73), 2 states have call successors, (27), 2 states have call predecessors, (27), 2 states have return successors, (26), 2 states have call predecessors, (26), 2 states have call successors, (26) Word has length 149 [2021-11-23 03:54:18,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:54:18,431 INFO L225 Difference]: With dead ends: 46569 [2021-11-23 03:54:18,431 INFO L226 Difference]: Without dead ends: 23734 [2021-11-23 03:54:18,526 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:54:18,527 INFO L933 BasicCegarLoop]: 584 mSDtfsCounter, 30 mSDsluCounter, 1208 mSDsCounter, 0 mSdLazyCounter, 121 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 1717 SdHoareTripleChecker+Invalid, 136 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 121 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:54:18,529 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 1717 Invalid, 136 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 121 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 03:54:18,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23734 states. [2021-11-23 03:54:19,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23734 to 22960. [2021-11-23 03:54:19,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22960 states, 16119 states have (on average 1.537068056331038) internal successors, (24776), 16949 states have internal predecessors, (24776), 5267 states have call successors, (5267), 1331 states have call predecessors, (5267), 1573 states have return successors, (7740), 4952 states have call predecessors, (7740), 5262 states have call successors, (7740) [2021-11-23 03:54:20,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22960 states to 22960 states and 37783 transitions. [2021-11-23 03:54:20,055 INFO L78 Accepts]: Start accepts. Automaton has 22960 states and 37783 transitions. Word has length 149 [2021-11-23 03:54:20,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:54:20,056 INFO L470 AbstractCegarLoop]: Abstraction has 22960 states and 37783 transitions. [2021-11-23 03:54:20,056 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.25) internal successors, (73), 4 states have internal predecessors, (73), 2 states have call successors, (27), 2 states have call predecessors, (27), 2 states have return successors, (26), 2 states have call predecessors, (26), 2 states have call successors, (26) [2021-11-23 03:54:20,056 INFO L276 IsEmpty]: Start isEmpty. Operand 22960 states and 37783 transitions. [2021-11-23 03:54:20,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2021-11-23 03:54:20,069 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:54:20,070 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:54:20,070 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-23 03:54:20,070 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:54:20,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:54:20,071 INFO L85 PathProgramCache]: Analyzing trace with hash -1275500057, now seen corresponding path program 1 times [2021-11-23 03:54:20,071 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:54:20,071 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [345353395] [2021-11-23 03:54:20,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:54:20,072 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:54:20,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:54:20,245 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 4 proven. 16 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2021-11-23 03:54:20,246 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:54:20,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [345353395] [2021-11-23 03:54:20,246 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [345353395] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:54:20,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1029395141] [2021-11-23 03:54:20,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:54:20,247 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:54:20,247 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:54:20,253 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:54:20,274 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 03:54:20,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:54:20,722 INFO L263 TraceCheckSpWp]: Trace formula consists of 2102 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 03:54:20,737 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:54:21,021 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 46 proven. 0 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-23 03:54:21,022 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:54:21,022 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1029395141] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:54:21,022 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:54:21,022 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 7 [2021-11-23 03:54:21,023 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1521683927] [2021-11-23 03:54:21,023 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:54:21,024 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:54:21,024 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:54:21,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:54:21,024 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:54:21,025 INFO L87 Difference]: Start difference. First operand 22960 states and 37783 transitions. Second operand has 4 states, 4 states have (on average 21.75) internal successors, (87), 4 states have internal predecessors, (87), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-23 03:54:22,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:54:22,707 INFO L93 Difference]: Finished difference Result 47307 states and 80480 transitions. [2021-11-23 03:54:22,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:54:22,708 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 21.75) internal successors, (87), 4 states have internal predecessors, (87), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) Word has length 156 [2021-11-23 03:54:22,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:54:22,856 INFO L225 Difference]: With dead ends: 47307 [2021-11-23 03:54:22,857 INFO L226 Difference]: Without dead ends: 24364 [2021-11-23 03:54:22,957 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 158 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-23 03:54:22,958 INFO L933 BasicCegarLoop]: 510 mSDtfsCounter, 213 mSDsluCounter, 1072 mSDsCounter, 0 mSdLazyCounter, 260 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 213 SdHoareTripleChecker+Valid, 1506 SdHoareTripleChecker+Invalid, 269 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 260 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:54:22,959 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [213 Valid, 1506 Invalid, 269 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 260 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:54:22,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24364 states. [2021-11-23 03:54:24,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24364 to 24364. [2021-11-23 03:54:24,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24364 states, 17487 states have (on average 1.5671069937667983) internal successors, (27404), 18317 states have internal predecessors, (27404), 5267 states have call successors, (5267), 1367 states have call predecessors, (5267), 1609 states have return successors, (7740), 4952 states have call predecessors, (7740), 5262 states have call successors, (7740) [2021-11-23 03:54:24,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24364 states to 24364 states and 40411 transitions. [2021-11-23 03:54:24,441 INFO L78 Accepts]: Start accepts. Automaton has 24364 states and 40411 transitions. Word has length 156 [2021-11-23 03:54:24,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:54:24,441 INFO L470 AbstractCegarLoop]: Abstraction has 24364 states and 40411 transitions. [2021-11-23 03:54:24,442 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 21.75) internal successors, (87), 4 states have internal predecessors, (87), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-23 03:54:24,442 INFO L276 IsEmpty]: Start isEmpty. Operand 24364 states and 40411 transitions. [2021-11-23 03:54:24,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2021-11-23 03:54:24,454 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:54:24,454 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:54:24,497 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-23 03:54:24,676 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-23 03:54:24,676 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:54:24,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:54:24,677 INFO L85 PathProgramCache]: Analyzing trace with hash -403579044, now seen corresponding path program 1 times [2021-11-23 03:54:24,677 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:54:24,677 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [682589607] [2021-11-23 03:54:24,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:54:24,678 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:54:24,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:54:24,840 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 9 proven. 15 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2021-11-23 03:54:24,840 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:54:24,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [682589607] [2021-11-23 03:54:24,841 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [682589607] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:54:24,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [850456522] [2021-11-23 03:54:24,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:54:24,842 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:54:24,842 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:54:24,843 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:54:24,845 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 03:54:25,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:54:25,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 2107 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 03:54:25,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:54:25,517 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 64 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-23 03:54:25,518 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:54:25,518 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [850456522] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:54:25,518 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:54:25,518 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2021-11-23 03:54:25,519 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1650578723] [2021-11-23 03:54:25,519 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:54:25,520 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:54:25,520 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:54:25,520 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:54:25,520 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:54:25,521 INFO L87 Difference]: Start difference. First operand 24364 states and 40411 transitions. Second operand has 4 states, 4 states have (on average 23.0) internal successors, (92), 4 states have internal predecessors, (92), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-23 03:54:26,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:54:26,966 INFO L93 Difference]: Finished difference Result 50115 states and 85631 transitions. [2021-11-23 03:54:26,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:54:26,967 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 23.0) internal successors, (92), 4 states have internal predecessors, (92), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) Word has length 161 [2021-11-23 03:54:26,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:54:27,129 INFO L225 Difference]: With dead ends: 50115 [2021-11-23 03:54:27,129 INFO L226 Difference]: Without dead ends: 25768 [2021-11-23 03:54:27,239 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 161 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:54:27,241 INFO L933 BasicCegarLoop]: 510 mSDtfsCounter, 211 mSDsluCounter, 1072 mSDsCounter, 0 mSdLazyCounter, 254 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 211 SdHoareTripleChecker+Valid, 1506 SdHoareTripleChecker+Invalid, 268 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 254 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:54:27,241 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [211 Valid, 1506 Invalid, 268 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 254 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:54:27,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25768 states. [2021-11-23 03:54:28,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25768 to 25768. [2021-11-23 03:54:28,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25768 states, 18855 states have (on average 1.5927870591355078) internal successors, (30032), 19685 states have internal predecessors, (30032), 5267 states have call successors, (5267), 1403 states have call predecessors, (5267), 1645 states have return successors, (7740), 4952 states have call predecessors, (7740), 5262 states have call successors, (7740) [2021-11-23 03:54:28,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25768 states to 25768 states and 43039 transitions. [2021-11-23 03:54:28,545 INFO L78 Accepts]: Start accepts. Automaton has 25768 states and 43039 transitions. Word has length 161 [2021-11-23 03:54:28,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:54:28,546 INFO L470 AbstractCegarLoop]: Abstraction has 25768 states and 43039 transitions. [2021-11-23 03:54:28,546 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 23.0) internal successors, (92), 4 states have internal predecessors, (92), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-23 03:54:28,546 INFO L276 IsEmpty]: Start isEmpty. Operand 25768 states and 43039 transitions. [2021-11-23 03:54:28,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2021-11-23 03:54:28,566 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:54:28,567 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:54:28,609 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 03:54:28,785 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:54:28,785 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:54:28,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:54:28,786 INFO L85 PathProgramCache]: Analyzing trace with hash 144039148, now seen corresponding path program 1 times [2021-11-23 03:54:28,786 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:54:28,786 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [400674494] [2021-11-23 03:54:28,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:54:28,786 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:54:28,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:54:28,909 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 15 proven. 12 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-11-23 03:54:28,909 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:54:28,909 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [400674494] [2021-11-23 03:54:28,909 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [400674494] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:54:28,910 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1083180042] [2021-11-23 03:54:28,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:54:28,910 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:54:28,910 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:54:28,911 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:54:28,932 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 03:54:29,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:54:29,310 INFO L263 TraceCheckSpWp]: Trace formula consists of 2111 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 03:54:29,315 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:54:29,583 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 69 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 03:54:29,583 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:54:29,583 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1083180042] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:54:29,584 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:54:29,584 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2021-11-23 03:54:29,584 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2051120143] [2021-11-23 03:54:29,584 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:54:29,585 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:54:29,585 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:54:29,585 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:54:29,586 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:54:29,586 INFO L87 Difference]: Start difference. First operand 25768 states and 43039 transitions. Second operand has 4 states, 4 states have (on average 24.0) internal successors, (96), 4 states have internal predecessors, (96), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-23 03:54:30,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:54:30,876 INFO L93 Difference]: Finished difference Result 52923 states and 90782 transitions. [2021-11-23 03:54:30,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:54:30,876 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 24.0) internal successors, (96), 4 states have internal predecessors, (96), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) Word has length 165 [2021-11-23 03:54:30,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:54:31,071 INFO L225 Difference]: With dead ends: 52923 [2021-11-23 03:54:31,072 INFO L226 Difference]: Without dead ends: 27172 [2021-11-23 03:54:31,204 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 165 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:54:31,205 INFO L933 BasicCegarLoop]: 510 mSDtfsCounter, 209 mSDsluCounter, 1072 mSDsCounter, 0 mSdLazyCounter, 248 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 209 SdHoareTripleChecker+Valid, 1506 SdHoareTripleChecker+Invalid, 267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 248 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:54:31,205 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [209 Valid, 1506 Invalid, 267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 248 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:54:31,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27172 states. [2021-11-23 03:54:32,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27172 to 27172. [2021-11-23 03:54:32,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27172 states, 20223 states have (on average 1.614992829946101) internal successors, (32660), 21053 states have internal predecessors, (32660), 5267 states have call successors, (5267), 1439 states have call predecessors, (5267), 1681 states have return successors, (7740), 4952 states have call predecessors, (7740), 5262 states have call successors, (7740) [2021-11-23 03:54:32,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27172 states to 27172 states and 45667 transitions. [2021-11-23 03:54:32,671 INFO L78 Accepts]: Start accepts. Automaton has 27172 states and 45667 transitions. Word has length 165 [2021-11-23 03:54:32,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:54:32,672 INFO L470 AbstractCegarLoop]: Abstraction has 27172 states and 45667 transitions. [2021-11-23 03:54:32,672 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 24.0) internal successors, (96), 4 states have internal predecessors, (96), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-23 03:54:32,672 INFO L276 IsEmpty]: Start isEmpty. Operand 27172 states and 45667 transitions. [2021-11-23 03:54:32,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2021-11-23 03:54:32,682 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:54:32,682 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:54:32,722 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 03:54:32,897 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:54:32,897 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:54:32,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:54:32,898 INFO L85 PathProgramCache]: Analyzing trace with hash -372693039, now seen corresponding path program 1 times [2021-11-23 03:54:32,898 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:54:32,898 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [898801056] [2021-11-23 03:54:32,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:54:32,898 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:54:32,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:54:33,021 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 22 proven. 7 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2021-11-23 03:54:33,021 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:54:33,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [898801056] [2021-11-23 03:54:33,021 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [898801056] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:54:33,022 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2024563582] [2021-11-23 03:54:33,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:54:33,022 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:54:33,022 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:54:33,024 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:54:33,043 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 03:54:33,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:54:33,379 INFO L263 TraceCheckSpWp]: Trace formula consists of 2114 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 03:54:33,385 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:54:33,658 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 60 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 03:54:33,659 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:54:33,659 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2024563582] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:54:33,659 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:54:33,659 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2021-11-23 03:54:33,660 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [825196739] [2021-11-23 03:54:33,660 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:54:33,660 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:54:33,661 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:54:33,661 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:54:33,661 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:54:33,662 INFO L87 Difference]: Start difference. First operand 27172 states and 45667 transitions. Second operand has 4 states, 4 states have (on average 25.0) internal successors, (100), 4 states have internal predecessors, (100), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-23 03:54:34,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:54:34,724 INFO L93 Difference]: Finished difference Result 55731 states and 95933 transitions. [2021-11-23 03:54:34,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:54:34,725 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 25.0) internal successors, (100), 4 states have internal predecessors, (100), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) Word has length 168 [2021-11-23 03:54:34,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:54:34,834 INFO L225 Difference]: With dead ends: 55731 [2021-11-23 03:54:34,834 INFO L226 Difference]: Without dead ends: 28576 [2021-11-23 03:54:34,923 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 168 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:54:34,923 INFO L933 BasicCegarLoop]: 510 mSDtfsCounter, 207 mSDsluCounter, 1072 mSDsCounter, 0 mSdLazyCounter, 242 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 207 SdHoareTripleChecker+Valid, 1506 SdHoareTripleChecker+Invalid, 266 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 242 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:54:34,924 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [207 Valid, 1506 Invalid, 266 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 242 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:54:34,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28576 states. [2021-11-23 03:54:36,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28576 to 28576. [2021-11-23 03:54:36,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28576 states, 21591 states have (on average 1.6343846973275902) internal successors, (35288), 22421 states have internal predecessors, (35288), 5267 states have call successors, (5267), 1475 states have call predecessors, (5267), 1717 states have return successors, (7740), 4952 states have call predecessors, (7740), 5262 states have call successors, (7740) [2021-11-23 03:54:36,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28576 states to 28576 states and 48295 transitions. [2021-11-23 03:54:36,160 INFO L78 Accepts]: Start accepts. Automaton has 28576 states and 48295 transitions. Word has length 168 [2021-11-23 03:54:36,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:54:36,160 INFO L470 AbstractCegarLoop]: Abstraction has 28576 states and 48295 transitions. [2021-11-23 03:54:36,161 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 25.0) internal successors, (100), 4 states have internal predecessors, (100), 2 states have call successors, (28), 2 states have call predecessors, (28), 3 states have return successors, (27), 2 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-23 03:54:36,161 INFO L276 IsEmpty]: Start isEmpty. Operand 28576 states and 48295 transitions. [2021-11-23 03:54:36,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2021-11-23 03:54:36,173 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:54:36,174 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:54:36,214 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 03:54:36,389 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-23 03:54:36,389 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:54:36,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:54:36,390 INFO L85 PathProgramCache]: Analyzing trace with hash 1320601603, now seen corresponding path program 1 times [2021-11-23 03:54:36,390 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:54:36,390 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1379293183] [2021-11-23 03:54:36,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:54:36,390 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:54:36,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:54:36,589 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2021-11-23 03:54:36,589 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:54:36,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1379293183] [2021-11-23 03:54:36,590 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1379293183] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:54:36,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2094520142] [2021-11-23 03:54:36,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:54:36,591 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:54:36,591 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:54:36,592 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:54:36,809 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 03:54:37,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:54:37,157 INFO L263 TraceCheckSpWp]: Trace formula consists of 2110 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 03:54:37,163 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:54:37,515 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 79 trivial. 0 not checked. [2021-11-23 03:54:37,515 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:54:37,515 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2094520142] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:54:37,515 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:54:37,516 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [8] total 12 [2021-11-23 03:54:37,516 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [487930797] [2021-11-23 03:54:37,516 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:54:37,517 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 03:54:37,517 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:54:37,517 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 03:54:37,517 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2021-11-23 03:54:37,518 INFO L87 Difference]: Start difference. First operand 28576 states and 48295 transitions. Second operand has 6 states, 5 states have (on average 18.2) internal successors, (91), 5 states have internal predecessors, (91), 3 states have call successors, (28), 3 states have call predecessors, (28), 4 states have return successors, (27), 4 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-23 03:54:39,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:54:39,027 INFO L93 Difference]: Finished difference Result 58999 states and 100141 transitions. [2021-11-23 03:54:39,027 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 03:54:39,027 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 18.2) internal successors, (91), 5 states have internal predecessors, (91), 3 states have call successors, (28), 3 states have call predecessors, (28), 4 states have return successors, (27), 4 states have call predecessors, (27), 2 states have call successors, (27) Word has length 170 [2021-11-23 03:54:39,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:54:39,127 INFO L225 Difference]: With dead ends: 58999 [2021-11-23 03:54:39,127 INFO L226 Difference]: Without dead ends: 30455 [2021-11-23 03:54:39,184 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 171 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=152, Unknown=0, NotChecked=0, Total=182 [2021-11-23 03:54:39,185 INFO L933 BasicCegarLoop]: 659 mSDtfsCounter, 336 mSDsluCounter, 1996 mSDsCounter, 0 mSdLazyCounter, 360 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 338 SdHoareTripleChecker+Valid, 2520 SdHoareTripleChecker+Invalid, 362 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 360 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:54:39,186 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [338 Valid, 2520 Invalid, 362 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 360 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:54:39,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30455 states. [2021-11-23 03:54:40,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30455 to 30255. [2021-11-23 03:54:40,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30255 states, 22705 states have (on average 1.6165602290244439) internal successors, (36704), 23577 states have internal predecessors, (36704), 5634 states have call successors, (5634), 1685 states have call predecessors, (5634), 1915 states have return successors, (8955), 5265 states have call predecessors, (8955), 5629 states have call successors, (8955) [2021-11-23 03:54:40,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30255 states to 30255 states and 51293 transitions. [2021-11-23 03:54:40,348 INFO L78 Accepts]: Start accepts. Automaton has 30255 states and 51293 transitions. Word has length 170 [2021-11-23 03:54:40,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:54:40,348 INFO L470 AbstractCegarLoop]: Abstraction has 30255 states and 51293 transitions. [2021-11-23 03:54:40,348 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 18.2) internal successors, (91), 5 states have internal predecessors, (91), 3 states have call successors, (28), 3 states have call predecessors, (28), 4 states have return successors, (27), 4 states have call predecessors, (27), 2 states have call successors, (27) [2021-11-23 03:54:40,349 INFO L276 IsEmpty]: Start isEmpty. Operand 30255 states and 51293 transitions. [2021-11-23 03:54:40,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2021-11-23 03:54:40,359 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:54:40,360 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:54:40,397 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-11-23 03:54:40,572 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-23 03:54:40,573 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:54:40,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:54:40,573 INFO L85 PathProgramCache]: Analyzing trace with hash 1424808555, now seen corresponding path program 1 times [2021-11-23 03:54:40,574 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:54:40,574 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [605279729] [2021-11-23 03:54:40,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:54:40,574 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:54:40,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:54:40,741 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2021-11-23 03:54:40,742 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:54:40,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [605279729] [2021-11-23 03:54:40,742 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [605279729] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:54:40,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [579371894] [2021-11-23 03:54:40,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:54:40,743 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:54:40,743 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:54:40,744 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:54:40,767 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 03:54:41,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:54:41,144 INFO L263 TraceCheckSpWp]: Trace formula consists of 2115 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-23 03:54:41,157 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:54:41,615 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-11-23 03:54:41,615 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:54:41,616 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [579371894] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:54:41,616 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:54:41,616 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [8] total 14 [2021-11-23 03:54:41,616 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1393743007] [2021-11-23 03:54:41,616 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:54:41,617 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 03:54:41,617 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:54:41,618 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 03:54:41,618 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2021-11-23 03:54:41,618 INFO L87 Difference]: Start difference. First operand 30255 states and 51293 transitions. Second operand has 8 states, 7 states have (on average 13.285714285714286) internal successors, (93), 7 states have internal predecessors, (93), 5 states have call successors, (28), 4 states have call predecessors, (28), 5 states have return successors, (27), 7 states have call predecessors, (27), 4 states have call successors, (27) [2021-11-23 03:54:45,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:54:45,546 INFO L93 Difference]: Finished difference Result 58433 states and 99393 transitions. [2021-11-23 03:54:45,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 03:54:45,547 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 13.285714285714286) internal successors, (93), 7 states have internal predecessors, (93), 5 states have call successors, (28), 4 states have call predecessors, (28), 5 states have return successors, (27), 7 states have call predecessors, (27), 4 states have call successors, (27) Word has length 173 [2021-11-23 03:54:45,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:54:45,707 INFO L225 Difference]: With dead ends: 58433 [2021-11-23 03:54:45,707 INFO L226 Difference]: Without dead ends: 28196 [2021-11-23 03:54:45,835 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 173 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=71, Invalid=349, Unknown=0, NotChecked=0, Total=420 [2021-11-23 03:54:45,837 INFO L933 BasicCegarLoop]: 574 mSDtfsCounter, 996 mSDsluCounter, 1047 mSDsCounter, 0 mSdLazyCounter, 3509 mSolverCounterSat, 490 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1074 SdHoareTripleChecker+Valid, 1544 SdHoareTripleChecker+Invalid, 3999 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 490 IncrementalHoareTripleChecker+Valid, 3509 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:54:45,840 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1074 Valid, 1544 Invalid, 3999 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [490 Valid, 3509 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 03:54:45,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28196 states. [2021-11-23 03:54:46,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28196 to 27027. [2021-11-23 03:54:46,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27027 states, 19880 states have (on average 1.533400402414487) internal successors, (30484), 20603 states have internal predecessors, (30484), 5114 states have call successors, (5114), 1781 states have call predecessors, (5114), 2032 states have return successors, (8436), 4845 states have call predecessors, (8436), 5109 states have call successors, (8436) [2021-11-23 03:54:47,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27027 states to 27027 states and 44034 transitions. [2021-11-23 03:54:47,122 INFO L78 Accepts]: Start accepts. Automaton has 27027 states and 44034 transitions. Word has length 173 [2021-11-23 03:54:47,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:54:47,122 INFO L470 AbstractCegarLoop]: Abstraction has 27027 states and 44034 transitions. [2021-11-23 03:54:47,123 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 13.285714285714286) internal successors, (93), 7 states have internal predecessors, (93), 5 states have call successors, (28), 4 states have call predecessors, (28), 5 states have return successors, (27), 7 states have call predecessors, (27), 4 states have call successors, (27) [2021-11-23 03:54:47,123 INFO L276 IsEmpty]: Start isEmpty. Operand 27027 states and 44034 transitions. [2021-11-23 03:54:47,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2021-11-23 03:54:47,134 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:54:47,134 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:54:47,171 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2021-11-23 03:54:47,349 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:54:47,349 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:54:47,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:54:47,350 INFO L85 PathProgramCache]: Analyzing trace with hash -1626646630, now seen corresponding path program 1 times [2021-11-23 03:54:47,350 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:54:47,350 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [13810875] [2021-11-23 03:54:47,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:54:47,350 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:54:47,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:54:47,527 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2021-11-23 03:54:47,527 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:54:47,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [13810875] [2021-11-23 03:54:47,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [13810875] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:54:47,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1333860690] [2021-11-23 03:54:47,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:54:47,528 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:54:47,529 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:54:47,533 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:54:47,552 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 03:54:47,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:54:47,929 INFO L263 TraceCheckSpWp]: Trace formula consists of 2116 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 03:54:47,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:54:48,530 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-11-23 03:54:48,530 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:54:48,530 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1333860690] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:54:48,531 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:54:48,531 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [8] total 11 [2021-11-23 03:54:48,531 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1985134994] [2021-11-23 03:54:48,531 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:54:48,532 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 03:54:48,532 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:54:48,532 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 03:54:48,533 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-11-23 03:54:48,533 INFO L87 Difference]: Start difference. First operand 27027 states and 44034 transitions. Second operand has 5 states, 5 states have (on average 18.6) internal successors, (93), 4 states have internal predecessors, (93), 2 states have call successors, (28), 2 states have call predecessors, (28), 2 states have return successors, (27), 2 states have call predecessors, (27), 1 states have call successors, (27) [2021-11-23 03:54:49,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:54:49,818 INFO L93 Difference]: Finished difference Result 27220 states and 44397 transitions. [2021-11-23 03:54:49,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:54:49,819 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 18.6) internal successors, (93), 4 states have internal predecessors, (93), 2 states have call successors, (28), 2 states have call predecessors, (28), 2 states have return successors, (27), 2 states have call predecessors, (27), 1 states have call successors, (27) Word has length 173 [2021-11-23 03:54:49,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:54:49,966 INFO L225 Difference]: With dead ends: 27220 [2021-11-23 03:54:49,967 INFO L226 Difference]: Without dead ends: 27201 [2021-11-23 03:54:49,982 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 175 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2021-11-23 03:54:49,982 INFO L933 BasicCegarLoop]: 575 mSDtfsCounter, 544 mSDsluCounter, 814 mSDsCounter, 0 mSdLazyCounter, 534 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 552 SdHoareTripleChecker+Valid, 1317 SdHoareTripleChecker+Invalid, 542 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 534 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 03:54:49,983 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [552 Valid, 1317 Invalid, 542 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 534 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 03:54:50,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27201 states. [2021-11-23 03:54:51,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27201 to 27031. [2021-11-23 03:54:51,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27031 states, 19884 states have (on average 1.5332930999798833) internal successors, (30488), 20607 states have internal predecessors, (30488), 5114 states have call successors, (5114), 1781 states have call predecessors, (5114), 2032 states have return successors, (8436), 4845 states have call predecessors, (8436), 5109 states have call successors, (8436) [2021-11-23 03:54:51,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27031 states to 27031 states and 44038 transitions. [2021-11-23 03:54:51,306 INFO L78 Accepts]: Start accepts. Automaton has 27031 states and 44038 transitions. Word has length 173 [2021-11-23 03:54:51,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:54:51,307 INFO L470 AbstractCegarLoop]: Abstraction has 27031 states and 44038 transitions. [2021-11-23 03:54:51,307 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 18.6) internal successors, (93), 4 states have internal predecessors, (93), 2 states have call successors, (28), 2 states have call predecessors, (28), 2 states have return successors, (27), 2 states have call predecessors, (27), 1 states have call successors, (27) [2021-11-23 03:54:51,307 INFO L276 IsEmpty]: Start isEmpty. Operand 27031 states and 44038 transitions. [2021-11-23 03:54:51,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2021-11-23 03:54:51,315 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:54:51,315 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:54:51,344 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2021-11-23 03:54:51,525 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-23 03:54:51,525 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:54:51,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:54:51,526 INFO L85 PathProgramCache]: Analyzing trace with hash -1872040340, now seen corresponding path program 1 times [2021-11-23 03:54:51,526 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:54:51,526 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1611630084] [2021-11-23 03:54:51,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:54:51,526 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:54:51,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:54:51,685 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2021-11-23 03:54:51,686 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:54:51,686 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1611630084] [2021-11-23 03:54:51,686 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1611630084] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:54:51,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [998069939] [2021-11-23 03:54:51,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:54:51,687 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:54:51,687 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:54:51,688 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:54:51,693 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 03:54:52,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:54:52,036 INFO L263 TraceCheckSpWp]: Trace formula consists of 2131 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 03:54:52,041 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:54:52,403 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 79 trivial. 0 not checked. [2021-11-23 03:54:52,403 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:54:52,404 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [998069939] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:54:52,404 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:54:52,404 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [8] total 12 [2021-11-23 03:54:52,404 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1884062913] [2021-11-23 03:54:52,404 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:54:52,405 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 03:54:52,405 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:54:52,406 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 03:54:52,406 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2021-11-23 03:54:52,406 INFO L87 Difference]: Start difference. First operand 27031 states and 44038 transitions. Second operand has 6 states, 5 states have (on average 19.4) internal successors, (97), 5 states have internal predecessors, (97), 3 states have call successors, (29), 3 states have call predecessors, (29), 4 states have return successors, (28), 4 states have call predecessors, (28), 2 states have call successors, (28) [2021-11-23 03:54:53,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:54:53,584 INFO L93 Difference]: Finished difference Result 28773 states and 47258 transitions. [2021-11-23 03:54:53,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 03:54:53,585 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 19.4) internal successors, (97), 5 states have internal predecessors, (97), 3 states have call successors, (29), 3 states have call predecessors, (29), 4 states have return successors, (28), 4 states have call predecessors, (28), 2 states have call successors, (28) Word has length 178 [2021-11-23 03:54:53,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:54:53,701 INFO L225 Difference]: With dead ends: 28773 [2021-11-23 03:54:53,702 INFO L226 Difference]: Without dead ends: 28687 [2021-11-23 03:54:53,726 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 179 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=173, Unknown=0, NotChecked=0, Total=210 [2021-11-23 03:54:53,727 INFO L933 BasicCegarLoop]: 587 mSDtfsCounter, 519 mSDsluCounter, 1755 mSDsCounter, 0 mSdLazyCounter, 392 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 521 SdHoareTripleChecker+Valid, 2223 SdHoareTripleChecker+Invalid, 411 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 392 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:54:53,728 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [521 Valid, 2223 Invalid, 411 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 392 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:54:53,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28687 states. [2021-11-23 03:54:54,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28687 to 28082. [2021-11-23 03:54:54,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28082 states, 20662 states have (on average 1.5279256606330462) internal successors, (31570), 21401 states have internal predecessors, (31570), 5274 states have call successors, (5274), 1878 states have call predecessors, (5274), 2145 states have return successors, (9480), 5005 states have call predecessors, (9480), 5269 states have call successors, (9480) [2021-11-23 03:54:55,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28082 states to 28082 states and 46324 transitions. [2021-11-23 03:54:55,057 INFO L78 Accepts]: Start accepts. Automaton has 28082 states and 46324 transitions. Word has length 178 [2021-11-23 03:54:55,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:54:55,058 INFO L470 AbstractCegarLoop]: Abstraction has 28082 states and 46324 transitions. [2021-11-23 03:54:55,058 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 19.4) internal successors, (97), 5 states have internal predecessors, (97), 3 states have call successors, (29), 3 states have call predecessors, (29), 4 states have return successors, (28), 4 states have call predecessors, (28), 2 states have call successors, (28) [2021-11-23 03:54:55,058 INFO L276 IsEmpty]: Start isEmpty. Operand 28082 states and 46324 transitions. [2021-11-23 03:54:55,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2021-11-23 03:54:55,066 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:54:55,066 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:54:55,089 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 03:54:55,268 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-23 03:54:55,268 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:54:55,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:54:55,268 INFO L85 PathProgramCache]: Analyzing trace with hash 796773575, now seen corresponding path program 1 times [2021-11-23 03:54:55,269 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:54:55,269 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [681173908] [2021-11-23 03:54:55,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:54:55,269 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:54:55,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:54:55,413 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2021-11-23 03:54:55,413 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:54:55,414 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [681173908] [2021-11-23 03:54:55,414 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [681173908] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:54:55,414 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1668028148] [2021-11-23 03:54:55,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:54:55,414 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:54:55,415 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:54:55,426 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:54:55,444 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 03:54:55,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:54:55,769 INFO L263 TraceCheckSpWp]: Trace formula consists of 2161 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 03:54:55,774 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:54:56,032 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 85 trivial. 0 not checked. [2021-11-23 03:54:56,032 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:54:56,033 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1668028148] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:54:56,033 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:54:56,033 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [8] total 10 [2021-11-23 03:54:56,033 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220886886] [2021-11-23 03:54:56,033 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:54:56,034 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:54:56,034 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:54:56,035 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:54:56,035 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2021-11-23 03:54:56,035 INFO L87 Difference]: Start difference. First operand 28082 states and 46324 transitions. Second operand has 4 states, 4 states have (on average 25.0) internal successors, (100), 4 states have internal predecessors, (100), 2 states have call successors, (30), 2 states have call predecessors, (30), 2 states have return successors, (29), 2 states have call predecessors, (29), 1 states have call successors, (29) [2021-11-23 03:54:57,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:54:57,228 INFO L93 Difference]: Finished difference Result 29046 states and 51201 transitions. [2021-11-23 03:54:57,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:54:57,228 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 25.0) internal successors, (100), 4 states have internal predecessors, (100), 2 states have call successors, (30), 2 states have call predecessors, (30), 2 states have return successors, (29), 2 states have call predecessors, (29), 1 states have call successors, (29) Word has length 185 [2021-11-23 03:54:57,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:54:57,364 INFO L225 Difference]: With dead ends: 29046 [2021-11-23 03:54:57,365 INFO L226 Difference]: Without dead ends: 28960 [2021-11-23 03:54:57,384 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 189 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2021-11-23 03:54:57,384 INFO L933 BasicCegarLoop]: 612 mSDtfsCounter, 47 mSDsluCounter, 1244 mSDsCounter, 0 mSdLazyCounter, 126 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 1783 SdHoareTripleChecker+Invalid, 138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:54:57,385 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 1783 Invalid, 138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 126 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:54:57,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28960 states. [2021-11-23 03:54:58,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28960 to 28218. [2021-11-23 03:54:58,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28218 states, 20798 states have (on average 1.5244735070679873) internal successors, (31706), 21537 states have internal predecessors, (31706), 5274 states have call successors, (5274), 1878 states have call predecessors, (5274), 2145 states have return successors, (9480), 5005 states have call predecessors, (9480), 5269 states have call successors, (9480) [2021-11-23 03:54:58,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28218 states to 28218 states and 46460 transitions. [2021-11-23 03:54:58,874 INFO L78 Accepts]: Start accepts. Automaton has 28218 states and 46460 transitions. Word has length 185 [2021-11-23 03:54:58,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:54:58,875 INFO L470 AbstractCegarLoop]: Abstraction has 28218 states and 46460 transitions. [2021-11-23 03:54:58,875 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 25.0) internal successors, (100), 4 states have internal predecessors, (100), 2 states have call successors, (30), 2 states have call predecessors, (30), 2 states have return successors, (29), 2 states have call predecessors, (29), 1 states have call successors, (29) [2021-11-23 03:54:58,875 INFO L276 IsEmpty]: Start isEmpty. Operand 28218 states and 46460 transitions. [2021-11-23 03:54:58,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 309 [2021-11-23 03:54:58,884 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:54:58,885 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 8, 6, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:54:58,910 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-23 03:54:59,085 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:54:59,086 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:54:59,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:54:59,086 INFO L85 PathProgramCache]: Analyzing trace with hash 1273015513, now seen corresponding path program 1 times [2021-11-23 03:54:59,087 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:54:59,087 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [274190343] [2021-11-23 03:54:59,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:54:59,087 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:54:59,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:54:59,278 INFO L134 CoverageAnalysis]: Checked inductivity of 445 backedges. 12 proven. 87 refuted. 0 times theorem prover too weak. 346 trivial. 0 not checked. [2021-11-23 03:54:59,278 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:54:59,279 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [274190343] [2021-11-23 03:54:59,279 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [274190343] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:54:59,279 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1719497718] [2021-11-23 03:54:59,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:54:59,279 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:54:59,280 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:54:59,280 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:54:59,303 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5ec23228-97cc-4bbe-ac6a-f862afa0b6a4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 03:54:59,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:54:59,718 INFO L263 TraceCheckSpWp]: Trace formula consists of 2965 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:54:59,736 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:55:00,412 INFO L134 CoverageAnalysis]: Checked inductivity of 445 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 443 trivial. 0 not checked. [2021-11-23 03:55:00,412 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:55:01,229 INFO L134 CoverageAnalysis]: Checked inductivity of 445 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 443 trivial. 0 not checked. [2021-11-23 03:55:01,229 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1719497718] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:55:01,229 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1123505196] [2021-11-23 03:55:01,254 INFO L159 IcfgInterpreter]: Started Sifa with 149 locations of interest [2021-11-23 03:55:01,254 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:55:01,260 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:55:01,265 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:55:01,266 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:55:12,220 INFO L197 IcfgInterpreter]: Interpreting procedure __automaton_fail with input of size 422 for LOIs [2021-11-23 03:55:12,314 INFO L197 IcfgInterpreter]: Interpreting procedure cleanup with input of size 598 for LOIs