./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/elevator_spec3_product21.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/elevator_spec3_product21.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7 --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 5c2801af81eeb5fcd439b1a1907444cd22ba07dc03ae6cb195ad73614e32dad5 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 19:39:22,630 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 19:39:22,633 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 19:39:22,669 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 19:39:22,669 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 19:39:22,671 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 19:39:22,673 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 19:39:22,675 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 19:39:22,677 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 19:39:22,679 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 19:39:22,680 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 19:39:22,682 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 19:39:22,682 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 19:39:22,684 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 19:39:22,685 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 19:39:22,687 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 19:39:22,688 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 19:39:22,689 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 19:39:22,692 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 19:39:22,694 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 19:39:22,696 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 19:39:22,702 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 19:39:22,703 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 19:39:22,705 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 19:39:22,708 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 19:39:22,709 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 19:39:22,709 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 19:39:22,710 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 19:39:22,711 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 19:39:22,712 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 19:39:22,713 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 19:39:22,714 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 19:39:22,715 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 19:39:22,716 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 19:39:22,728 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 19:39:22,728 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 19:39:22,729 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 19:39:22,729 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 19:39:22,730 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 19:39:22,731 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 19:39:22,732 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 19:39:22,733 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 19:39:22,784 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 19:39:22,784 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 19:39:22,785 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 19:39:22,785 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 19:39:22,786 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 19:39:22,787 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 19:39:22,787 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 19:39:22,787 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 19:39:22,787 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 19:39:22,787 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 19:39:22,788 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 19:39:22,789 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 19:39:22,789 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 19:39:22,789 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 19:39:22,789 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 19:39:22,790 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 19:39:22,790 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 19:39:22,790 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 19:39:22,791 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 19:39:22,791 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 19:39:22,791 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 19:39:22,791 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 19:39:22,792 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 19:39:22,792 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 19:39:22,792 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 19:39:22,792 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 19:39:22,794 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 19:39:22,794 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 19:39:22,794 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 19:39:22,795 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 19:39:22,795 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 19:39:22,795 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 19:39:22,796 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:39:22,796 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 19:39:22,796 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 19:39:22,796 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 19:39:22,796 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 19:39:22,797 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 19:39:22,797 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 19:39:22,797 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 19:39:22,797 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 19:39:22,797 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_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5c2801af81eeb5fcd439b1a1907444cd22ba07dc03ae6cb195ad73614e32dad5 [2021-11-25 19:39:23,108 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 19:39:23,130 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 19:39:23,133 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 19:39:23,134 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 19:39:23,135 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 19:39:23,137 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/product-lines/elevator_spec3_product21.cil.c [2021-11-25 19:39:23,200 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/data/44a593c8f/7bfad596e9cd4ed3a02b403034144cee/FLAGbaeb71bd4 [2021-11-25 19:39:23,843 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 19:39:23,844 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/sv-benchmarks/c/product-lines/elevator_spec3_product21.cil.c [2021-11-25 19:39:23,878 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/data/44a593c8f/7bfad596e9cd4ed3a02b403034144cee/FLAGbaeb71bd4 [2021-11-25 19:39:24,064 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/data/44a593c8f/7bfad596e9cd4ed3a02b403034144cee [2021-11-25 19:39:24,066 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 19:39:24,067 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 19:39:24,073 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 19:39:24,073 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 19:39:24,077 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 19:39:24,078 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:39:24" (1/1) ... [2021-11-25 19:39:24,081 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@58986f9f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:39:24, skipping insertion in model container [2021-11-25 19:39:24,082 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:39:24" (1/1) ... [2021-11-25 19:39:24,089 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 19:39:24,197 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 19:39:24,784 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_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/sv-benchmarks/c/product-lines/elevator_spec3_product21.cil.c[62420,62433] [2021-11-25 19:39:24,834 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:39:24,852 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 19:39:25,033 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_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/sv-benchmarks/c/product-lines/elevator_spec3_product21.cil.c[62420,62433] [2021-11-25 19:39:25,055 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:39:25,096 INFO L208 MainTranslator]: Completed translation [2021-11-25 19:39:25,097 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:39:25 WrapperNode [2021-11-25 19:39:25,097 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 19:39:25,098 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 19:39:25,099 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 19:39:25,099 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 19:39:25,107 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:39:25" (1/1) ... [2021-11-25 19:39:25,175 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:39:25" (1/1) ... [2021-11-25 19:39:25,265 INFO L137 Inliner]: procedures = 90, calls = 345, calls flagged for inlining = 24, calls inlined = 21, statements flattened = 884 [2021-11-25 19:39:25,266 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 19:39:25,267 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 19:39:25,268 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 19:39:25,268 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 19:39:25,278 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:39:25" (1/1) ... [2021-11-25 19:39:25,279 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:39:25" (1/1) ... [2021-11-25 19:39:25,297 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:39:25" (1/1) ... [2021-11-25 19:39:25,303 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:39:25" (1/1) ... [2021-11-25 19:39:25,346 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:39:25" (1/1) ... [2021-11-25 19:39:25,390 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:39:25" (1/1) ... [2021-11-25 19:39:25,395 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:39:25" (1/1) ... [2021-11-25 19:39:25,404 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 19:39:25,414 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 19:39:25,414 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 19:39:25,415 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 19:39:25,416 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:39:25" (1/1) ... [2021-11-25 19:39:25,427 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:39:25,440 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:39:25,454 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 19:39:25,467 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 19:39:25,507 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 19:39:25,507 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentHeading [2021-11-25 19:39:25,507 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentHeading [2021-11-25 19:39:25,507 INFO L130 BoogieDeclarations]: Found specification of procedure getWeight [2021-11-25 19:39:25,507 INFO L138 BoogieDeclarations]: Found implementation of procedure getWeight [2021-11-25 19:39:25,508 INFO L130 BoogieDeclarations]: Found specification of procedure enterElevator [2021-11-25 19:39:25,508 INFO L138 BoogieDeclarations]: Found implementation of procedure enterElevator [2021-11-25 19:39:25,508 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection [2021-11-25 19:39:25,508 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection [2021-11-25 19:39:25,508 INFO L130 BoogieDeclarations]: Found specification of procedure bobCall [2021-11-25 19:39:25,508 INFO L138 BoogieDeclarations]: Found implementation of procedure bobCall [2021-11-25 19:39:25,509 INFO L130 BoogieDeclarations]: Found specification of procedure getReverseHeading [2021-11-25 19:39:25,509 INFO L138 BoogieDeclarations]: Found implementation of procedure getReverseHeading [2021-11-25 19:39:25,509 INFO L130 BoogieDeclarations]: Found specification of procedure cleanup [2021-11-25 19:39:25,509 INFO L138 BoogieDeclarations]: Found implementation of procedure cleanup [2021-11-25 19:39:25,509 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift [2021-11-25 19:39:25,509 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift [2021-11-25 19:39:25,509 INFO L130 BoogieDeclarations]: Found specification of procedure __automaton_fail [2021-11-25 19:39:25,510 INFO L138 BoogieDeclarations]: Found implementation of procedure __automaton_fail [2021-11-25 19:39:25,510 INFO L130 BoogieDeclarations]: Found specification of procedure isTopFloor [2021-11-25 19:39:25,510 INFO L138 BoogieDeclarations]: Found implementation of procedure isTopFloor [2021-11-25 19:39:25,510 INFO L130 BoogieDeclarations]: Found specification of procedure getDestination [2021-11-25 19:39:25,510 INFO L138 BoogieDeclarations]: Found implementation of procedure getDestination [2021-11-25 19:39:25,510 INFO L130 BoogieDeclarations]: Found specification of procedure isBlocked [2021-11-25 19:39:25,511 INFO L138 BoogieDeclarations]: Found implementation of procedure isBlocked [2021-11-25 19:39:25,511 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentFloorID [2021-11-25 19:39:25,511 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentFloorID [2021-11-25 19:39:25,511 INFO L130 BoogieDeclarations]: Found specification of procedure initTopDown [2021-11-25 19:39:25,511 INFO L138 BoogieDeclarations]: Found implementation of procedure initTopDown [2021-11-25 19:39:25,511 INFO L130 BoogieDeclarations]: Found specification of procedure resetCallOnFloor [2021-11-25 19:39:25,511 INFO L138 BoogieDeclarations]: Found implementation of procedure resetCallOnFloor [2021-11-25 19:39:25,512 INFO L130 BoogieDeclarations]: Found specification of procedure initFloors [2021-11-25 19:39:25,512 INFO L138 BoogieDeclarations]: Found implementation of procedure initFloors [2021-11-25 19:39:25,512 INFO L130 BoogieDeclarations]: Found specification of procedure initPersonOnFloor [2021-11-25 19:39:25,512 INFO L138 BoogieDeclarations]: Found implementation of procedure initPersonOnFloor [2021-11-25 19:39:25,512 INFO L130 BoogieDeclarations]: Found specification of procedure removePersonFromFloor [2021-11-25 19:39:25,512 INFO L138 BoogieDeclarations]: Found implementation of procedure removePersonFromFloor [2021-11-25 19:39:25,512 INFO L130 BoogieDeclarations]: Found specification of procedure getOrigin [2021-11-25 19:39:25,513 INFO L138 BoogieDeclarations]: Found implementation of procedure getOrigin [2021-11-25 19:39:25,513 INFO L130 BoogieDeclarations]: Found specification of procedure continueInDirection [2021-11-25 19:39:25,513 INFO L138 BoogieDeclarations]: Found implementation of procedure continueInDirection [2021-11-25 19:39:25,513 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 19:39:25,513 INFO L130 BoogieDeclarations]: Found specification of procedure buttonForFloorIsPressed [2021-11-25 19:39:25,513 INFO L138 BoogieDeclarations]: Found implementation of procedure buttonForFloorIsPressed [2021-11-25 19:39:25,513 INFO L130 BoogieDeclarations]: Found specification of procedure pressInLiftFloorButton [2021-11-25 19:39:25,514 INFO L138 BoogieDeclarations]: Found implementation of procedure pressInLiftFloorButton [2021-11-25 19:39:25,514 INFO L130 BoogieDeclarations]: Found specification of procedure leaveElevator [2021-11-25 19:39:25,514 INFO L138 BoogieDeclarations]: Found implementation of procedure leaveElevator [2021-11-25 19:39:25,514 INFO L130 BoogieDeclarations]: Found specification of procedure isPersonOnFloor [2021-11-25 19:39:25,514 INFO L138 BoogieDeclarations]: Found implementation of procedure isPersonOnFloor [2021-11-25 19:39:25,514 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection__wrappee__weight [2021-11-25 19:39:25,514 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection__wrappee__weight [2021-11-25 19:39:25,515 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 19:39:25,515 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 19:39:25,515 INFO L130 BoogieDeclarations]: Found specification of procedure isFloorCalling [2021-11-25 19:39:25,515 INFO L138 BoogieDeclarations]: Found implementation of procedure isFloorCalling [2021-11-25 19:39:25,669 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 19:39:25,671 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 19:39:26,961 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 19:39:27,648 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 19:39:27,648 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-25 19:39:27,653 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:39:27 BoogieIcfgContainer [2021-11-25 19:39:27,654 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 19:39:27,658 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 19:39:27,658 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 19:39:27,663 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 19:39:27,664 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 07:39:24" (1/3) ... [2021-11-25 19:39:27,665 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4189c769 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:39:27, skipping insertion in model container [2021-11-25 19:39:27,665 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:39:25" (2/3) ... [2021-11-25 19:39:27,665 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4189c769 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:39:27, skipping insertion in model container [2021-11-25 19:39:27,666 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:39:27" (3/3) ... [2021-11-25 19:39:27,668 INFO L111 eAbstractionObserver]: Analyzing ICFG elevator_spec3_product21.cil.c [2021-11-25 19:39:27,678 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 19:39:27,679 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 19:39:27,743 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 19:39:27,750 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 [2021-11-25 19:39:27,750 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 19:39:27,783 INFO L276 IsEmpty]: Start isEmpty. Operand has 404 states, 270 states have (on average 1.5740740740740742) internal successors, (425), 288 states have internal predecessors, (425), 106 states have call successors, (106), 26 states have call predecessors, (106), 26 states have return successors, (106), 103 states have call predecessors, (106), 106 states have call successors, (106) [2021-11-25 19:39:27,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-25 19:39:27,816 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:39:27,817 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:39:27,817 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:39:27,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:39:27,823 INFO L85 PathProgramCache]: Analyzing trace with hash 191210052, now seen corresponding path program 1 times [2021-11-25 19:39:27,839 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:39:27,841 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [545092667] [2021-11-25 19:39:27,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:27,843 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:39:28,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:28,469 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:39:28,470 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:39:28,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [545092667] [2021-11-25 19:39:28,470 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [545092667] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:39:28,471 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:39:28,471 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 19:39:28,472 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1894017596] [2021-11-25 19:39:28,473 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:39:28,478 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 19:39:28,478 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:39:28,508 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 19:39:28,509 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:39:28,513 INFO L87 Difference]: Start difference. First operand has 404 states, 270 states have (on average 1.5740740740740742) internal successors, (425), 288 states have internal predecessors, (425), 106 states have call successors, (106), 26 states have call predecessors, (106), 26 states have return successors, (106), 103 states have call predecessors, (106), 106 states have call successors, (106) Second operand has 6 states, 5 states have (on average 9.6) internal successors, (48), 5 states have internal predecessors, (48), 4 states have call successors, (14), 3 states have call predecessors, (14), 3 states have return successors, (12), 5 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-25 19:39:29,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:39:29,704 INFO L93 Difference]: Finished difference Result 1150 states and 1839 transitions. [2021-11-25 19:39:29,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 19:39:29,707 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 9.6) internal successors, (48), 5 states have internal predecessors, (48), 4 states have call successors, (14), 3 states have call predecessors, (14), 3 states have return successors, (12), 5 states have call predecessors, (12), 4 states have call successors, (12) Word has length 75 [2021-11-25 19:39:29,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:39:29,734 INFO L225 Difference]: With dead ends: 1150 [2021-11-25 19:39:29,737 INFO L226 Difference]: Without dead ends: 748 [2021-11-25 19:39:29,756 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-11-25 19:39:29,763 INFO L933 BasicCegarLoop]: 654 mSDtfsCounter, 545 mSDsluCounter, 2489 mSDsCounter, 0 mSdLazyCounter, 769 mSolverCounterSat, 159 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 548 SdHoareTripleChecker+Valid, 2990 SdHoareTripleChecker+Invalid, 928 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 159 IncrementalHoareTripleChecker+Valid, 769 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:39:29,765 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [548 Valid, 2990 Invalid, 928 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [159 Valid, 769 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-25 19:39:29,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 748 states. [2021-11-25 19:39:29,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 748 to 740. [2021-11-25 19:39:29,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 740 states, 497 states have (on average 1.5010060362173039) internal successors, (746), 527 states have internal predecessors, (746), 196 states have call successors, (196), 49 states have call predecessors, (196), 46 states have return successors, (197), 188 states have call predecessors, (197), 192 states have call successors, (197) [2021-11-25 19:39:29,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 740 states to 740 states and 1139 transitions. [2021-11-25 19:39:29,962 INFO L78 Accepts]: Start accepts. Automaton has 740 states and 1139 transitions. Word has length 75 [2021-11-25 19:39:29,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:39:29,970 INFO L470 AbstractCegarLoop]: Abstraction has 740 states and 1139 transitions. [2021-11-25 19:39:29,970 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 9.6) internal successors, (48), 5 states have internal predecessors, (48), 4 states have call successors, (14), 3 states have call predecessors, (14), 3 states have return successors, (12), 5 states have call predecessors, (12), 4 states have call successors, (12) [2021-11-25 19:39:29,972 INFO L276 IsEmpty]: Start isEmpty. Operand 740 states and 1139 transitions. [2021-11-25 19:39:29,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-25 19:39:29,988 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:39:29,988 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:39:29,989 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 19:39:29,990 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:39:29,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:39:29,994 INFO L85 PathProgramCache]: Analyzing trace with hash -1254096571, now seen corresponding path program 1 times [2021-11-25 19:39:29,994 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:39:29,994 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1738466737] [2021-11-25 19:39:29,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:29,995 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:39:30,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:30,242 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:39:30,243 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:39:30,243 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1738466737] [2021-11-25 19:39:30,244 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1738466737] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:39:30,244 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:39:30,244 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-25 19:39:30,244 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [685833712] [2021-11-25 19:39:30,244 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:39:30,246 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 19:39:30,247 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:39:30,247 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 19:39:30,248 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:39:30,248 INFO L87 Difference]: Start difference. First operand 740 states and 1139 transitions. Second operand has 6 states, 5 states have (on average 10.0) internal successors, (50), 5 states have internal predecessors, (50), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (14), 4 states have call predecessors, (14), 3 states have call successors, (14) [2021-11-25 19:39:31,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:39:31,573 INFO L93 Difference]: Finished difference Result 2669 states and 4283 transitions. [2021-11-25 19:39:31,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-25 19:39:31,574 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 10.0) internal successors, (50), 5 states have internal predecessors, (50), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (14), 4 states have call predecessors, (14), 3 states have call successors, (14) Word has length 81 [2021-11-25 19:39:31,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:39:31,595 INFO L225 Difference]: With dead ends: 2669 [2021-11-25 19:39:31,595 INFO L226 Difference]: Without dead ends: 1941 [2021-11-25 19:39:31,604 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-11-25 19:39:31,606 INFO L933 BasicCegarLoop]: 921 mSDtfsCounter, 845 mSDsluCounter, 3257 mSDsCounter, 0 mSdLazyCounter, 751 mSolverCounterSat, 97 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 917 SdHoareTripleChecker+Valid, 4038 SdHoareTripleChecker+Invalid, 848 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 97 IncrementalHoareTripleChecker+Valid, 751 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:39:31,607 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [917 Valid, 4038 Invalid, 848 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [97 Valid, 751 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-25 19:39:31,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1941 states. [2021-11-25 19:39:31,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1941 to 1387. [2021-11-25 19:39:31,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1387 states, 949 states have (on average 1.5047418335089568) internal successors, (1428), 1007 states have internal predecessors, (1428), 351 states have call successors, (351), 91 states have call predecessors, (351), 86 states have return successors, (380), 326 states have call predecessors, (380), 345 states have call successors, (380) [2021-11-25 19:39:31,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1387 states to 1387 states and 2159 transitions. [2021-11-25 19:39:31,799 INFO L78 Accepts]: Start accepts. Automaton has 1387 states and 2159 transitions. Word has length 81 [2021-11-25 19:39:31,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:39:31,800 INFO L470 AbstractCegarLoop]: Abstraction has 1387 states and 2159 transitions. [2021-11-25 19:39:31,800 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 10.0) internal successors, (50), 5 states have internal predecessors, (50), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (14), 4 states have call predecessors, (14), 3 states have call successors, (14) [2021-11-25 19:39:31,800 INFO L276 IsEmpty]: Start isEmpty. Operand 1387 states and 2159 transitions. [2021-11-25 19:39:31,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-25 19:39:31,804 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:39:31,805 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:39:31,805 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 19:39:31,805 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:39:31,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:39:31,806 INFO L85 PathProgramCache]: Analyzing trace with hash -460683102, now seen corresponding path program 1 times [2021-11-25 19:39:31,806 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:39:31,806 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [730065245] [2021-11-25 19:39:31,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:31,807 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:39:31,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:31,950 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:39:31,951 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:39:31,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [730065245] [2021-11-25 19:39:31,951 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [730065245] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:39:31,952 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1195006362] [2021-11-25 19:39:31,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:31,952 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:31,953 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:39:31,954 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:39:31,980 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 19:39:32,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:32,312 INFO L263 TraceCheckSpWp]: Trace formula consists of 1581 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 19:39:32,324 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:39:32,579 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:39:32,581 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:39:32,582 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1195006362] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:39:32,582 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:39:32,583 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-25 19:39:32,583 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [179323154] [2021-11-25 19:39:32,584 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:39:32,588 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:39:32,588 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:39:32,589 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:39:32,589 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-25 19:39:32,590 INFO L87 Difference]: Start difference. First operand 1387 states and 2159 transitions. Second operand has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-25 19:39:32,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:39:32,955 INFO L93 Difference]: Finished difference Result 3959 states and 6319 transitions. [2021-11-25 19:39:32,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:39:32,956 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), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) Word has length 79 [2021-11-25 19:39:32,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:39:32,989 INFO L225 Difference]: With dead ends: 3959 [2021-11-25 19:39:32,989 INFO L226 Difference]: Without dead ends: 2584 [2021-11-25 19:39:33,005 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-25 19:39:33,009 INFO L933 BasicCegarLoop]: 674 mSDtfsCounter, 562 mSDsluCounter, 531 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 562 SdHoareTripleChecker+Valid, 1173 SdHoareTripleChecker+Invalid, 87 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:39:33,011 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [562 Valid, 1173 Invalid, 87 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:39:33,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2584 states. [2021-11-25 19:39:33,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2584 to 2509. [2021-11-25 19:39:33,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2509 states, 1727 states have (on average 1.5176606832657789) internal successors, (2621), 1843 states have internal predecessors, (2621), 620 states have call successors, (620), 162 states have call predecessors, (620), 161 states have return successors, (700), 579 states have call predecessors, (700), 614 states have call successors, (700) [2021-11-25 19:39:33,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2509 states to 2509 states and 3941 transitions. [2021-11-25 19:39:33,206 INFO L78 Accepts]: Start accepts. Automaton has 2509 states and 3941 transitions. Word has length 79 [2021-11-25 19:39:33,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:39:33,208 INFO L470 AbstractCegarLoop]: Abstraction has 2509 states and 3941 transitions. [2021-11-25 19:39:33,208 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), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-25 19:39:33,208 INFO L276 IsEmpty]: Start isEmpty. Operand 2509 states and 3941 transitions. [2021-11-25 19:39:33,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-25 19:39:33,215 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:39:33,215 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:39:33,258 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 19:39:33,428 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:33,428 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:39:33,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:39:33,429 INFO L85 PathProgramCache]: Analyzing trace with hash 2053895846, now seen corresponding path program 1 times [2021-11-25 19:39:33,429 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:39:33,430 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1229415777] [2021-11-25 19:39:33,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:33,430 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:39:33,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:33,632 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 19:39:33,632 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:39:33,633 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1229415777] [2021-11-25 19:39:33,633 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1229415777] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:39:33,633 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1279004477] [2021-11-25 19:39:33,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:33,633 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:33,634 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:39:33,641 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:39:33,649 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 19:39:33,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:33,991 INFO L263 TraceCheckSpWp]: Trace formula consists of 1583 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 19:39:33,998 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:39:34,187 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:39:34,187 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:39:34,187 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1279004477] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:39:34,188 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:39:34,188 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-25 19:39:34,188 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1242226664] [2021-11-25 19:39:34,188 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:39:34,192 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:39:34,193 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:39:34,193 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:39:34,195 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-25 19:39:34,195 INFO L87 Difference]: Start difference. First operand 2509 states and 3941 transitions. Second operand has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-25 19:39:34,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:39:34,671 INFO L93 Difference]: Finished difference Result 5622 states and 8926 transitions. [2021-11-25 19:39:34,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:39:34,672 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), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) Word has length 81 [2021-11-25 19:39:34,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:39:34,708 INFO L225 Difference]: With dead ends: 5622 [2021-11-25 19:39:34,709 INFO L226 Difference]: Without dead ends: 3125 [2021-11-25 19:39:34,736 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-25 19:39:34,739 INFO L933 BasicCegarLoop]: 680 mSDtfsCounter, 559 mSDsluCounter, 528 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 559 SdHoareTripleChecker+Valid, 1176 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:39:34,741 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [559 Valid, 1176 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:39:34,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3125 states. [2021-11-25 19:39:34,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3125 to 3082. [2021-11-25 19:39:34,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3082 states, 2129 states have (on average 1.5274776890558948) internal successors, (3252), 2274 states have internal predecessors, (3252), 755 states have call successors, (755), 196 states have call predecessors, (755), 197 states have return successors, (854), 707 states have call predecessors, (854), 749 states have call successors, (854) [2021-11-25 19:39:34,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3082 states to 3082 states and 4861 transitions. [2021-11-25 19:39:34,989 INFO L78 Accepts]: Start accepts. Automaton has 3082 states and 4861 transitions. Word has length 81 [2021-11-25 19:39:34,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:39:34,990 INFO L470 AbstractCegarLoop]: Abstraction has 3082 states and 4861 transitions. [2021-11-25 19:39:34,990 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), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-25 19:39:34,990 INFO L276 IsEmpty]: Start isEmpty. Operand 3082 states and 4861 transitions. [2021-11-25 19:39:34,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-25 19:39:34,997 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:39:34,997 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:39:35,038 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 19:39:35,211 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2021-11-25 19:39:35,211 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:39:35,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:39:35,212 INFO L85 PathProgramCache]: Analyzing trace with hash -1929571329, now seen corresponding path program 1 times [2021-11-25 19:39:35,212 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:39:35,212 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [618536822] [2021-11-25 19:39:35,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:35,212 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:39:35,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:35,469 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:39:35,469 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:39:35,469 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [618536822] [2021-11-25 19:39:35,469 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [618536822] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:39:35,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1770774212] [2021-11-25 19:39:35,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:35,470 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:35,470 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:39:35,471 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:39:35,492 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 19:39:35,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:35,839 INFO L263 TraceCheckSpWp]: Trace formula consists of 1608 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 19:39:35,845 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:39:36,081 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:39:36,081 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:39:36,082 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1770774212] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:39:36,082 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:39:36,082 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10] total 13 [2021-11-25 19:39:36,082 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1398392007] [2021-11-25 19:39:36,083 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:39:36,083 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 19:39:36,083 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:39:36,084 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 19:39:36,084 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=130, Unknown=0, NotChecked=0, Total=156 [2021-11-25 19:39:36,084 INFO L87 Difference]: Start difference. First operand 3082 states and 4861 transitions. Second operand has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 2 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (15), 2 states have call predecessors, (15), 2 states have call successors, (15) [2021-11-25 19:39:36,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:39:36,624 INFO L93 Difference]: Finished difference Result 6167 states and 9944 transitions. [2021-11-25 19:39:36,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:39:36,625 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 2 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (15), 2 states have call predecessors, (15), 2 states have call successors, (15) Word has length 87 [2021-11-25 19:39:36,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:39:36,666 INFO L225 Difference]: With dead ends: 6167 [2021-11-25 19:39:36,666 INFO L226 Difference]: Without dead ends: 3902 [2021-11-25 19:39:36,690 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=174, Unknown=0, NotChecked=0, Total=210 [2021-11-25 19:39:36,691 INFO L933 BasicCegarLoop]: 650 mSDtfsCounter, 210 mSDsluCounter, 1889 mSDsCounter, 0 mSdLazyCounter, 162 mSolverCounterSat, 135 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 210 SdHoareTripleChecker+Valid, 2430 SdHoareTripleChecker+Invalid, 297 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 135 IncrementalHoareTripleChecker+Valid, 162 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:39:36,691 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [210 Valid, 2430 Invalid, 297 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [135 Valid, 162 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 19:39:36,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3902 states. [2021-11-25 19:39:36,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3902 to 3286. [2021-11-25 19:39:37,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3286 states, 2271 states have (on average 1.520035226772347) internal successors, (3452), 2437 states have internal predecessors, (3452), 814 states have call successors, (814), 196 states have call predecessors, (814), 200 states have return successors, (925), 766 states have call predecessors, (925), 808 states have call successors, (925) [2021-11-25 19:39:37,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3286 states to 3286 states and 5191 transitions. [2021-11-25 19:39:37,045 INFO L78 Accepts]: Start accepts. Automaton has 3286 states and 5191 transitions. Word has length 87 [2021-11-25 19:39:37,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:39:37,046 INFO L470 AbstractCegarLoop]: Abstraction has 3286 states and 5191 transitions. [2021-11-25 19:39:37,046 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 2 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (15), 2 states have call predecessors, (15), 2 states have call successors, (15) [2021-11-25 19:39:37,046 INFO L276 IsEmpty]: Start isEmpty. Operand 3286 states and 5191 transitions. [2021-11-25 19:39:37,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-11-25 19:39:37,055 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:39:37,056 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:39:37,100 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 19:39:37,276 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:37,277 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:39:37,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:39:37,277 INFO L85 PathProgramCache]: Analyzing trace with hash -1888429568, now seen corresponding path program 1 times [2021-11-25 19:39:37,277 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:39:37,277 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [784811515] [2021-11-25 19:39:37,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:37,278 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:39:37,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:37,509 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-25 19:39:37,509 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:39:37,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [784811515] [2021-11-25 19:39:37,509 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [784811515] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:39:37,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1458985021] [2021-11-25 19:39:37,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:37,510 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:37,510 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:39:37,511 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:39:37,516 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 19:39:37,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:37,861 INFO L263 TraceCheckSpWp]: Trace formula consists of 1614 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 19:39:37,869 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:39:38,229 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 19:39:38,229 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:39:38,230 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1458985021] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:39:38,232 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:39:38,232 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [10] total 15 [2021-11-25 19:39:38,233 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1484495577] [2021-11-25 19:39:38,233 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:39:38,234 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 19:39:38,234 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:39:38,235 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 19:39:38,235 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2021-11-25 19:39:38,235 INFO L87 Difference]: Start difference. First operand 3286 states and 5191 transitions. Second operand has 7 states, 7 states have (on average 7.285714285714286) internal successors, (51), 7 states have internal predecessors, (51), 5 states have call successors, (18), 3 states have call predecessors, (18), 4 states have return successors, (16), 4 states have call predecessors, (16), 5 states have call successors, (16) [2021-11-25 19:39:39,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:39:39,383 INFO L93 Difference]: Finished difference Result 5778 states and 9149 transitions. [2021-11-25 19:39:39,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 19:39:39,384 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 7.285714285714286) internal successors, (51), 7 states have internal predecessors, (51), 5 states have call successors, (18), 3 states have call predecessors, (18), 4 states have return successors, (16), 4 states have call predecessors, (16), 5 states have call successors, (16) Word has length 88 [2021-11-25 19:39:39,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:39:39,425 INFO L225 Difference]: With dead ends: 5778 [2021-11-25 19:39:39,426 INFO L226 Difference]: Without dead ends: 3325 [2021-11-25 19:39:39,449 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2021-11-25 19:39:39,451 INFO L933 BasicCegarLoop]: 721 mSDtfsCounter, 520 mSDsluCounter, 1777 mSDsCounter, 0 mSdLazyCounter, 914 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 533 SdHoareTripleChecker+Valid, 2356 SdHoareTripleChecker+Invalid, 929 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 914 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 19:39:39,452 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [533 Valid, 2356 Invalid, 929 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 914 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-25 19:39:39,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3325 states. [2021-11-25 19:39:39,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3325 to 3322. [2021-11-25 19:39:39,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3322 states, 2295 states have (on average 1.5145969498910676) internal successors, (3476), 2457 states have internal predecessors, (3476), 814 states have call successors, (814), 200 states have call predecessors, (814), 212 states have return successors, (941), 778 states have call predecessors, (941), 808 states have call successors, (941) [2021-11-25 19:39:39,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3322 states to 3322 states and 5231 transitions. [2021-11-25 19:39:39,747 INFO L78 Accepts]: Start accepts. Automaton has 3322 states and 5231 transitions. Word has length 88 [2021-11-25 19:39:39,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:39:39,748 INFO L470 AbstractCegarLoop]: Abstraction has 3322 states and 5231 transitions. [2021-11-25 19:39:39,748 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 7.285714285714286) internal successors, (51), 7 states have internal predecessors, (51), 5 states have call successors, (18), 3 states have call predecessors, (18), 4 states have return successors, (16), 4 states have call predecessors, (16), 5 states have call successors, (16) [2021-11-25 19:39:39,748 INFO L276 IsEmpty]: Start isEmpty. Operand 3322 states and 5231 transitions. [2021-11-25 19:39:39,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-11-25 19:39:39,753 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:39:39,753 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:39:39,794 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 19:39:39,972 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:39,972 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:39:39,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:39:39,972 INFO L85 PathProgramCache]: Analyzing trace with hash 1055788230, now seen corresponding path program 1 times [2021-11-25 19:39:39,973 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:39:39,973 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1136184859] [2021-11-25 19:39:39,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:39,973 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:39:40,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:40,215 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-25 19:39:40,216 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:39:40,216 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1136184859] [2021-11-25 19:39:40,216 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1136184859] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:39:40,216 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1932205904] [2021-11-25 19:39:40,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:40,217 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:40,217 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:39:40,218 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:39:40,239 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 19:39:40,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:40,613 INFO L263 TraceCheckSpWp]: Trace formula consists of 1614 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-25 19:39:40,619 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:39:41,083 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 19:39:41,084 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:39:41,557 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 19:39:41,557 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1932205904] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-25 19:39:41,557 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-25 19:39:41,557 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [10, 9] total 20 [2021-11-25 19:39:41,558 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1036879562] [2021-11-25 19:39:41,558 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:39:41,559 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 19:39:41,559 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:39:41,559 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 19:39:41,560 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=328, Unknown=0, NotChecked=0, Total=380 [2021-11-25 19:39:41,560 INFO L87 Difference]: Start difference. First operand 3322 states and 5231 transitions. Second operand has 9 states, 8 states have (on average 6.875) internal successors, (55), 8 states have internal predecessors, (55), 4 states have call successors, (18), 4 states have call predecessors, (18), 4 states have return successors, (16), 4 states have call predecessors, (16), 3 states have call successors, (16) [2021-11-25 19:39:45,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:39:45,801 INFO L93 Difference]: Finished difference Result 8634 states and 14349 transitions. [2021-11-25 19:39:45,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-25 19:39:45,802 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 6.875) internal successors, (55), 8 states have internal predecessors, (55), 4 states have call successors, (18), 4 states have call predecessors, (18), 4 states have return successors, (16), 4 states have call predecessors, (16), 3 states have call successors, (16) Word has length 92 [2021-11-25 19:39:45,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:39:45,881 INFO L225 Difference]: With dead ends: 8634 [2021-11-25 19:39:45,882 INFO L226 Difference]: Without dead ends: 6545 [2021-11-25 19:39:46,003 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 179 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 139 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=160, Invalid=962, Unknown=0, NotChecked=0, Total=1122 [2021-11-25 19:39:46,004 INFO L933 BasicCegarLoop]: 745 mSDtfsCounter, 2354 mSDsluCounter, 2952 mSDsCounter, 0 mSdLazyCounter, 2812 mSolverCounterSat, 1064 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2444 SdHoareTripleChecker+Valid, 3534 SdHoareTripleChecker+Invalid, 3876 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 1064 IncrementalHoareTripleChecker+Valid, 2812 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2021-11-25 19:39:46,004 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2444 Valid, 3534 Invalid, 3876 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [1064 Valid, 2812 Invalid, 0 Unknown, 0 Unchecked, 3.4s Time] [2021-11-25 19:39:46,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6545 states. [2021-11-25 19:39:46,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6545 to 6050. [2021-11-25 19:39:46,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6050 states, 4287 states have (on average 1.5264753907161186) internal successors, (6544), 4523 states have internal predecessors, (6544), 1345 states have call successors, (1345), 378 states have call predecessors, (1345), 417 states have return successors, (1858), 1292 states have call predecessors, (1858), 1337 states have call successors, (1858) [2021-11-25 19:39:46,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6050 states to 6050 states and 9747 transitions. [2021-11-25 19:39:46,602 INFO L78 Accepts]: Start accepts. Automaton has 6050 states and 9747 transitions. Word has length 92 [2021-11-25 19:39:46,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:39:46,604 INFO L470 AbstractCegarLoop]: Abstraction has 6050 states and 9747 transitions. [2021-11-25 19:39:46,605 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 6.875) internal successors, (55), 8 states have internal predecessors, (55), 4 states have call successors, (18), 4 states have call predecessors, (18), 4 states have return successors, (16), 4 states have call predecessors, (16), 3 states have call successors, (16) [2021-11-25 19:39:46,605 INFO L276 IsEmpty]: Start isEmpty. Operand 6050 states and 9747 transitions. [2021-11-25 19:39:46,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-25 19:39:46,610 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:39:46,611 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:39:46,657 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 19:39:46,824 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:46,824 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:39:46,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:39:46,825 INFO L85 PathProgramCache]: Analyzing trace with hash -1957450367, now seen corresponding path program 1 times [2021-11-25 19:39:46,825 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:39:46,825 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1768848582] [2021-11-25 19:39:46,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:46,825 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:39:46,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:47,022 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-25 19:39:47,023 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:39:47,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1768848582] [2021-11-25 19:39:47,023 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1768848582] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:39:47,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [759230382] [2021-11-25 19:39:47,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:47,024 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:47,024 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:39:47,029 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:39:47,052 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 19:39:47,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:47,389 INFO L263 TraceCheckSpWp]: Trace formula consists of 1631 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 19:39:47,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:39:47,708 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 19:39:47,708 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:39:47,709 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [759230382] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:39:47,709 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:39:47,709 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10] total 13 [2021-11-25 19:39:47,709 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1033413967] [2021-11-25 19:39:47,710 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:39:47,710 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 19:39:47,710 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:39:47,711 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 19:39:47,711 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=129, Unknown=0, NotChecked=0, Total=156 [2021-11-25 19:39:47,711 INFO L87 Difference]: Start difference. First operand 6050 states and 9747 transitions. Second operand has 5 states, 5 states have (on average 11.4) internal successors, (57), 5 states have internal predecessors, (57), 4 states have call successors, (19), 3 states have call predecessors, (19), 4 states have return successors, (17), 3 states have call predecessors, (17), 4 states have call successors, (17) [2021-11-25 19:39:48,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:39:48,716 INFO L93 Difference]: Finished difference Result 10883 states and 17626 transitions. [2021-11-25 19:39:48,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 19:39:48,717 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.4) internal successors, (57), 5 states have internal predecessors, (57), 4 states have call successors, (19), 3 states have call predecessors, (19), 4 states have return successors, (17), 3 states have call predecessors, (17), 4 states have call successors, (17) Word has length 96 [2021-11-25 19:39:48,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:39:48,788 INFO L225 Difference]: With dead ends: 10883 [2021-11-25 19:39:48,789 INFO L226 Difference]: Without dead ends: 6066 [2021-11-25 19:39:48,818 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2021-11-25 19:39:48,818 INFO L933 BasicCegarLoop]: 738 mSDtfsCounter, 419 mSDsluCounter, 1981 mSDsCounter, 0 mSdLazyCounter, 369 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 419 SdHoareTripleChecker+Valid, 2610 SdHoareTripleChecker+Invalid, 375 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 369 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:39:48,819 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [419 Valid, 2610 Invalid, 375 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 369 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 19:39:48,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6066 states. [2021-11-25 19:39:49,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6066 to 6050. [2021-11-25 19:39:49,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6050 states, 4287 states have (on average 1.5264753907161186) internal successors, (6544), 4523 states have internal predecessors, (6544), 1345 states have call successors, (1345), 378 states have call predecessors, (1345), 417 states have return successors, (1850), 1292 states have call predecessors, (1850), 1337 states have call successors, (1850) [2021-11-25 19:39:49,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6050 states to 6050 states and 9739 transitions. [2021-11-25 19:39:49,352 INFO L78 Accepts]: Start accepts. Automaton has 6050 states and 9739 transitions. Word has length 96 [2021-11-25 19:39:49,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:39:49,352 INFO L470 AbstractCegarLoop]: Abstraction has 6050 states and 9739 transitions. [2021-11-25 19:39:49,353 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.4) internal successors, (57), 5 states have internal predecessors, (57), 4 states have call successors, (19), 3 states have call predecessors, (19), 4 states have return successors, (17), 3 states have call predecessors, (17), 4 states have call successors, (17) [2021-11-25 19:39:49,353 INFO L276 IsEmpty]: Start isEmpty. Operand 6050 states and 9739 transitions. [2021-11-25 19:39:49,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-25 19:39:49,361 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:39:49,362 INFO L514 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:39:49,405 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 19:39:49,585 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-25 19:39:49,586 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:39:49,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:39:49,586 INFO L85 PathProgramCache]: Analyzing trace with hash -1398097999, now seen corresponding path program 1 times [2021-11-25 19:39:49,586 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:39:49,587 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [711024403] [2021-11-25 19:39:49,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:49,587 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:39:49,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:49,798 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 19:39:49,799 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:39:49,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [711024403] [2021-11-25 19:39:49,799 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [711024403] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:39:49,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [885179024] [2021-11-25 19:39:49,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:49,800 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:49,800 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:39:49,801 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:39:49,820 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 19:39:50,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:50,207 INFO L263 TraceCheckSpWp]: Trace formula consists of 1740 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 19:39:50,211 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:39:50,522 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 19:39:50,522 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:39:50,523 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [885179024] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:39:50,523 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:39:50,523 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [10] total 15 [2021-11-25 19:39:50,523 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1884744138] [2021-11-25 19:39:50,523 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:39:50,524 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 19:39:50,524 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:39:50,524 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 19:39:50,524 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-11-25 19:39:50,525 INFO L87 Difference]: Start difference. First operand 6050 states and 9739 transitions. Second operand has 7 states, 7 states have (on average 10.0) internal successors, (70), 5 states have internal predecessors, (70), 2 states have call successors, (24), 2 states have call predecessors, (24), 4 states have return successors, (22), 4 states have call predecessors, (22), 2 states have call successors, (22) [2021-11-25 19:39:51,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:39:51,163 INFO L93 Difference]: Finished difference Result 11579 states and 19108 transitions. [2021-11-25 19:39:51,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 19:39:51,163 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 10.0) internal successors, (70), 5 states have internal predecessors, (70), 2 states have call successors, (24), 2 states have call predecessors, (24), 4 states have return successors, (22), 4 states have call predecessors, (22), 2 states have call successors, (22) Word has length 121 [2021-11-25 19:39:51,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:39:51,221 INFO L225 Difference]: With dead ends: 11579 [2021-11-25 19:39:51,222 INFO L226 Difference]: Without dead ends: 6374 [2021-11-25 19:39:51,257 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-11-25 19:39:51,258 INFO L933 BasicCegarLoop]: 610 mSDtfsCounter, 13 mSDsluCounter, 3193 mSDsCounter, 0 mSdLazyCounter, 247 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 3620 SdHoareTripleChecker+Invalid, 264 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 247 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:39:51,258 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 3620 Invalid, 264 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 247 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:39:51,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6374 states. [2021-11-25 19:39:51,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6374 to 6222. [2021-11-25 19:39:51,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6222 states, 4403 states have (on average 1.5126050420168067) internal successors, (6660), 4651 states have internal predecessors, (6660), 1345 states have call successors, (1345), 378 states have call predecessors, (1345), 473 states have return successors, (2177), 1336 states have call predecessors, (2177), 1337 states have call successors, (2177) [2021-11-25 19:39:51,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6222 states to 6222 states and 10182 transitions. [2021-11-25 19:39:51,840 INFO L78 Accepts]: Start accepts. Automaton has 6222 states and 10182 transitions. Word has length 121 [2021-11-25 19:39:51,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:39:51,840 INFO L470 AbstractCegarLoop]: Abstraction has 6222 states and 10182 transitions. [2021-11-25 19:39:51,841 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 10.0) internal successors, (70), 5 states have internal predecessors, (70), 2 states have call successors, (24), 2 states have call predecessors, (24), 4 states have return successors, (22), 4 states have call predecessors, (22), 2 states have call successors, (22) [2021-11-25 19:39:51,841 INFO L276 IsEmpty]: Start isEmpty. Operand 6222 states and 10182 transitions. [2021-11-25 19:39:51,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-11-25 19:39:51,848 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:39:51,848 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:39:51,889 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 19:39:52,072 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:52,072 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:39:52,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:39:52,073 INFO L85 PathProgramCache]: Analyzing trace with hash -2005790721, now seen corresponding path program 1 times [2021-11-25 19:39:52,073 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:39:52,073 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [99459925] [2021-11-25 19:39:52,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:52,074 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:39:52,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:52,269 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-25 19:39:52,269 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:39:52,269 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [99459925] [2021-11-25 19:39:52,270 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [99459925] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:39:52,270 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2099842651] [2021-11-25 19:39:52,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:52,271 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:52,271 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:39:52,272 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:39:52,300 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 19:39:52,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:52,587 INFO L263 TraceCheckSpWp]: Trace formula consists of 1741 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 19:39:52,592 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:39:52,854 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 19:39:52,855 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:39:52,855 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2099842651] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:39:52,855 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:39:52,855 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [10] total 15 [2021-11-25 19:39:52,856 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [696569995] [2021-11-25 19:39:52,856 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:39:52,857 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 19:39:52,857 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:39:52,858 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 19:39:52,858 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-11-25 19:39:52,859 INFO L87 Difference]: Start difference. First operand 6222 states and 10182 transitions. Second operand has 7 states, 7 states have (on average 10.142857142857142) internal successors, (71), 5 states have internal predecessors, (71), 2 states have call successors, (24), 2 states have call predecessors, (24), 4 states have return successors, (22), 4 states have call predecessors, (22), 2 states have call successors, (22) [2021-11-25 19:39:53,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:39:53,405 INFO L93 Difference]: Finished difference Result 11859 states and 19745 transitions. [2021-11-25 19:39:53,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 19:39:53,405 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 10.142857142857142) internal successors, (71), 5 states have internal predecessors, (71), 2 states have call successors, (24), 2 states have call predecessors, (24), 4 states have return successors, (22), 4 states have call predecessors, (22), 2 states have call successors, (22) Word has length 122 [2021-11-25 19:39:53,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:39:53,459 INFO L225 Difference]: With dead ends: 11859 [2021-11-25 19:39:53,459 INFO L226 Difference]: Without dead ends: 6490 [2021-11-25 19:39:53,496 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-11-25 19:39:53,497 INFO L933 BasicCegarLoop]: 611 mSDtfsCounter, 13 mSDsluCounter, 3201 mSDsCounter, 0 mSdLazyCounter, 252 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 3625 SdHoareTripleChecker+Invalid, 269 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 252 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:39:53,497 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 3625 Invalid, 269 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 252 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:39:53,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6490 states. [2021-11-25 19:39:53,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6490 to 6250. [2021-11-25 19:39:53,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6250 states, 4431 states have (on average 1.5093658316407133) internal successors, (6688), 4651 states have internal predecessors, (6688), 1345 states have call successors, (1345), 378 states have call predecessors, (1345), 473 states have return successors, (2177), 1364 states have call predecessors, (2177), 1337 states have call successors, (2177) [2021-11-25 19:39:54,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6250 states to 6250 states and 10210 transitions. [2021-11-25 19:39:54,024 INFO L78 Accepts]: Start accepts. Automaton has 6250 states and 10210 transitions. Word has length 122 [2021-11-25 19:39:54,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:39:54,025 INFO L470 AbstractCegarLoop]: Abstraction has 6250 states and 10210 transitions. [2021-11-25 19:39:54,025 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 10.142857142857142) internal successors, (71), 5 states have internal predecessors, (71), 2 states have call successors, (24), 2 states have call predecessors, (24), 4 states have return successors, (22), 4 states have call predecessors, (22), 2 states have call successors, (22) [2021-11-25 19:39:54,025 INFO L276 IsEmpty]: Start isEmpty. Operand 6250 states and 10210 transitions. [2021-11-25 19:39:54,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-11-25 19:39:54,031 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:39:54,032 INFO L514 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:39:54,069 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 19:39:54,248 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-25 19:39:54,248 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:39:54,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:39:54,249 INFO L85 PathProgramCache]: Analyzing trace with hash -494134713, now seen corresponding path program 1 times [2021-11-25 19:39:54,249 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:39:54,249 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1944416581] [2021-11-25 19:39:54,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:54,249 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:39:54,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:54,454 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-25 19:39:54,455 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:39:54,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1944416581] [2021-11-25 19:39:54,455 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1944416581] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:39:54,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1972415547] [2021-11-25 19:39:54,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:54,455 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:54,456 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:39:54,460 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:39:54,466 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 19:39:54,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:54,732 INFO L263 TraceCheckSpWp]: Trace formula consists of 1739 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 19:39:54,736 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:39:55,002 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 19:39:55,002 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:39:55,002 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1972415547] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:39:55,002 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:39:55,002 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [10] total 15 [2021-11-25 19:39:55,003 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [683225542] [2021-11-25 19:39:55,003 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:39:55,003 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 19:39:55,004 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:39:55,004 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 19:39:55,004 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-11-25 19:39:55,004 INFO L87 Difference]: Start difference. First operand 6250 states and 10210 transitions. Second operand has 7 states, 7 states have (on average 10.714285714285714) internal successors, (75), 5 states have internal predecessors, (75), 2 states have call successors, (24), 2 states have call predecessors, (24), 4 states have return successors, (22), 4 states have call predecessors, (22), 2 states have call successors, (22) [2021-11-25 19:39:55,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:39:55,620 INFO L93 Difference]: Finished difference Result 11915 states and 19801 transitions. [2021-11-25 19:39:55,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 19:39:55,620 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 10.714285714285714) internal successors, (75), 5 states have internal predecessors, (75), 2 states have call successors, (24), 2 states have call predecessors, (24), 4 states have return successors, (22), 4 states have call predecessors, (22), 2 states have call successors, (22) Word has length 125 [2021-11-25 19:39:55,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:39:55,669 INFO L225 Difference]: With dead ends: 11915 [2021-11-25 19:39:55,669 INFO L226 Difference]: Without dead ends: 6518 [2021-11-25 19:39:55,704 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 122 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-11-25 19:39:55,705 INFO L933 BasicCegarLoop]: 613 mSDtfsCounter, 13 mSDsluCounter, 3204 mSDsCounter, 0 mSdLazyCounter, 248 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 3634 SdHoareTripleChecker+Invalid, 265 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 248 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:39:55,706 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 3634 Invalid, 265 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 248 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:39:55,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6518 states. [2021-11-25 19:39:56,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6518 to 6278. [2021-11-25 19:39:56,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6278 states, 4459 states have (on average 1.5061673020856694) internal successors, (6716), 4651 states have internal predecessors, (6716), 1345 states have call successors, (1345), 378 states have call predecessors, (1345), 473 states have return successors, (2177), 1392 states have call predecessors, (2177), 1337 states have call successors, (2177) [2021-11-25 19:39:56,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6278 states to 6278 states and 10238 transitions. [2021-11-25 19:39:56,118 INFO L78 Accepts]: Start accepts. Automaton has 6278 states and 10238 transitions. Word has length 125 [2021-11-25 19:39:56,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:39:56,119 INFO L470 AbstractCegarLoop]: Abstraction has 6278 states and 10238 transitions. [2021-11-25 19:39:56,119 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 10.714285714285714) internal successors, (75), 5 states have internal predecessors, (75), 2 states have call successors, (24), 2 states have call predecessors, (24), 4 states have return successors, (22), 4 states have call predecessors, (22), 2 states have call successors, (22) [2021-11-25 19:39:56,120 INFO L276 IsEmpty]: Start isEmpty. Operand 6278 states and 10238 transitions. [2021-11-25 19:39:56,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-11-25 19:39:56,128 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:39:56,128 INFO L514 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:39:56,170 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-25 19:39:56,343 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:56,344 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:39:56,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:39:56,344 INFO L85 PathProgramCache]: Analyzing trace with hash 1137353605, now seen corresponding path program 1 times [2021-11-25 19:39:56,344 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:39:56,344 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [315260617] [2021-11-25 19:39:56,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:56,345 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:39:56,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:56,550 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 19:39:56,551 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:39:56,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [315260617] [2021-11-25 19:39:56,551 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [315260617] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:39:56,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1353015966] [2021-11-25 19:39:56,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:56,552 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:56,552 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:39:56,553 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:39:56,578 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 19:39:56,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:56,896 INFO L263 TraceCheckSpWp]: Trace formula consists of 1746 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-25 19:39:56,900 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:39:57,150 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-25 19:39:57,151 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:39:57,151 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1353015966] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:39:57,151 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:39:57,151 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [10] total 14 [2021-11-25 19:39:57,152 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [265526313] [2021-11-25 19:39:57,152 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:39:57,152 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 19:39:57,152 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:39:57,153 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 19:39:57,153 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=154, Unknown=0, NotChecked=0, Total=182 [2021-11-25 19:39:57,153 INFO L87 Difference]: Start difference. First operand 6278 states and 10238 transitions. Second operand has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 3 states have call successors, (23), 2 states have call predecessors, (23), 4 states have return successors, (21), 3 states have call predecessors, (21), 3 states have call successors, (21) [2021-11-25 19:39:57,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:39:57,760 INFO L93 Difference]: Finished difference Result 13773 states and 23002 transitions. [2021-11-25 19:39:57,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 19:39:57,761 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 3 states have call successors, (23), 2 states have call predecessors, (23), 4 states have return successors, (21), 3 states have call predecessors, (21), 3 states have call successors, (21) Word has length 132 [2021-11-25 19:39:57,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:39:57,833 INFO L225 Difference]: With dead ends: 13773 [2021-11-25 19:39:57,833 INFO L226 Difference]: Without dead ends: 8104 [2021-11-25 19:39:57,875 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=204, Unknown=0, NotChecked=0, Total=240 [2021-11-25 19:39:57,876 INFO L933 BasicCegarLoop]: 617 mSDtfsCounter, 329 mSDsluCounter, 2364 mSDsCounter, 0 mSdLazyCounter, 319 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 343 SdHoareTripleChecker+Valid, 2835 SdHoareTripleChecker+Invalid, 353 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 319 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:39:57,876 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [343 Valid, 2835 Invalid, 353 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 319 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:39:57,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8104 states. [2021-11-25 19:39:58,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8104 to 8104. [2021-11-25 19:39:58,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8104 states, 6022 states have (on average 1.5478246429757556) internal successors, (9321), 6249 states have internal predecessors, (9321), 1545 states have call successors, (1545), 406 states have call predecessors, (1545), 536 states have return successors, (2377), 1592 states have call predecessors, (2377), 1537 states have call successors, (2377) [2021-11-25 19:39:58,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8104 states to 8104 states and 13243 transitions. [2021-11-25 19:39:58,540 INFO L78 Accepts]: Start accepts. Automaton has 8104 states and 13243 transitions. Word has length 132 [2021-11-25 19:39:58,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:39:58,541 INFO L470 AbstractCegarLoop]: Abstraction has 8104 states and 13243 transitions. [2021-11-25 19:39:58,541 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 3 states have call successors, (23), 2 states have call predecessors, (23), 4 states have return successors, (21), 3 states have call predecessors, (21), 3 states have call successors, (21) [2021-11-25 19:39:58,542 INFO L276 IsEmpty]: Start isEmpty. Operand 8104 states and 13243 transitions. [2021-11-25 19:39:58,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2021-11-25 19:39:58,554 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:39:58,554 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-25 19:39:58,594 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 19:39:58,771 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:58,771 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:39:58,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:39:58,772 INFO L85 PathProgramCache]: Analyzing trace with hash 319839567, now seen corresponding path program 1 times [2021-11-25 19:39:58,772 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:39:58,772 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [164585738] [2021-11-25 19:39:58,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:58,773 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:39:58,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:58,956 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 19:39:58,957 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:39:58,957 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [164585738] [2021-11-25 19:39:58,957 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [164585738] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:39:58,957 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [627421113] [2021-11-25 19:39:58,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:58,958 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:58,958 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:39:58,964 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:39:58,985 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-25 19:39:59,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:59,311 INFO L263 TraceCheckSpWp]: Trace formula consists of 1745 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-25 19:39:59,315 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:39:59,593 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 19:39:59,593 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:39:59,594 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [627421113] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:39:59,594 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:39:59,594 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [10] total 14 [2021-11-25 19:39:59,594 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [492882307] [2021-11-25 19:39:59,595 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:39:59,595 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 19:39:59,595 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:39:59,596 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 19:39:59,596 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=154, Unknown=0, NotChecked=0, Total=182 [2021-11-25 19:39:59,597 INFO L87 Difference]: Start difference. First operand 8104 states and 13243 transitions. Second operand has 6 states, 6 states have (on average 14.666666666666666) internal successors, (88), 6 states have internal predecessors, (88), 3 states have call successors, (23), 2 states have call predecessors, (23), 4 states have return successors, (21), 3 states have call predecessors, (21), 3 states have call successors, (21) [2021-11-25 19:40:00,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:40:00,300 INFO L93 Difference]: Finished difference Result 17624 states and 29469 transitions. [2021-11-25 19:40:00,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 19:40:00,301 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 14.666666666666666) internal successors, (88), 6 states have internal predecessors, (88), 3 states have call successors, (23), 2 states have call predecessors, (23), 4 states have return successors, (21), 3 states have call predecessors, (21), 3 states have call successors, (21) Word has length 136 [2021-11-25 19:40:00,302 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:40:00,466 INFO L225 Difference]: With dead ends: 17624 [2021-11-25 19:40:00,466 INFO L226 Difference]: Without dead ends: 7677 [2021-11-25 19:40:00,515 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=204, Unknown=0, NotChecked=0, Total=240 [2021-11-25 19:40:00,516 INFO L933 BasicCegarLoop]: 625 mSDtfsCounter, 255 mSDsluCounter, 2380 mSDsCounter, 0 mSdLazyCounter, 312 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 269 SdHoareTripleChecker+Valid, 2867 SdHoareTripleChecker+Invalid, 338 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 312 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:40:00,516 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [269 Valid, 2867 Invalid, 338 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 312 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:40:00,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7677 states. [2021-11-25 19:40:00,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7677 to 7677. [2021-11-25 19:40:00,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7677 states, 5668 states have (on average 1.5047635850388144) internal successors, (8529), 5891 states have internal predecessors, (8529), 1492 states have call successors, (1492), 400 states have call predecessors, (1492), 516 states have return successors, (2292), 1529 states have call predecessors, (2292), 1484 states have call successors, (2292) [2021-11-25 19:40:00,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7677 states to 7677 states and 12313 transitions. [2021-11-25 19:40:00,980 INFO L78 Accepts]: Start accepts. Automaton has 7677 states and 12313 transitions. Word has length 136 [2021-11-25 19:40:00,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:40:00,981 INFO L470 AbstractCegarLoop]: Abstraction has 7677 states and 12313 transitions. [2021-11-25 19:40:00,981 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 14.666666666666666) internal successors, (88), 6 states have internal predecessors, (88), 3 states have call successors, (23), 2 states have call predecessors, (23), 4 states have return successors, (21), 3 states have call predecessors, (21), 3 states have call successors, (21) [2021-11-25 19:40:00,982 INFO L276 IsEmpty]: Start isEmpty. Operand 7677 states and 12313 transitions. [2021-11-25 19:40:00,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2021-11-25 19:40:00,994 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:40:00,995 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:40:01,034 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-25 19:40:01,208 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:40:01,208 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:40:01,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:40:01,209 INFO L85 PathProgramCache]: Analyzing trace with hash 1970028357, now seen corresponding path program 1 times [2021-11-25 19:40:01,209 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:40:01,209 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1385131800] [2021-11-25 19:40:01,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:40:01,209 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:40:01,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:40:01,376 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-25 19:40:01,377 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:40:01,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1385131800] [2021-11-25 19:40:01,377 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1385131800] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:40:01,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1317844407] [2021-11-25 19:40:01,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:40:01,378 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:40:01,378 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:40:01,379 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:40:01,389 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-25 19:40:01,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:40:01,714 INFO L263 TraceCheckSpWp]: Trace formula consists of 1750 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-25 19:40:01,719 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:40:02,642 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 19:40:02,642 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:40:02,642 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1317844407] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:40:02,643 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:40:02,643 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [10] total 16 [2021-11-25 19:40:02,643 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2123166161] [2021-11-25 19:40:02,644 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:40:02,644 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 19:40:02,644 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:40:02,645 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 19:40:02,645 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2021-11-25 19:40:02,645 INFO L87 Difference]: Start difference. First operand 7677 states and 12313 transitions. Second operand has 8 states, 8 states have (on average 10.75) internal successors, (86), 8 states have internal predecessors, (86), 4 states have call successors, (23), 4 states have call predecessors, (23), 2 states have return successors, (21), 2 states have call predecessors, (21), 4 states have call successors, (21) [2021-11-25 19:40:07,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:40:07,270 INFO L93 Difference]: Finished difference Result 31301 states and 52296 transitions. [2021-11-25 19:40:07,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 19:40:07,270 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 10.75) internal successors, (86), 8 states have internal predecessors, (86), 4 states have call successors, (23), 4 states have call predecessors, (23), 2 states have return successors, (21), 2 states have call predecessors, (21), 4 states have call successors, (21) Word has length 137 [2021-11-25 19:40:07,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:40:07,462 INFO L225 Difference]: With dead ends: 31301 [2021-11-25 19:40:07,462 INFO L226 Difference]: Without dead ends: 23896 [2021-11-25 19:40:07,544 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 133 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=79, Invalid=301, Unknown=0, NotChecked=0, Total=380 [2021-11-25 19:40:07,545 INFO L933 BasicCegarLoop]: 2528 mSDtfsCounter, 2992 mSDsluCounter, 4098 mSDsCounter, 0 mSdLazyCounter, 2480 mSolverCounterSat, 450 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3007 SdHoareTripleChecker+Valid, 6369 SdHoareTripleChecker+Invalid, 2930 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 450 IncrementalHoareTripleChecker+Valid, 2480 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:40:07,545 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3007 Valid, 6369 Invalid, 2930 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [450 Valid, 2480 Invalid, 0 Unknown, 0 Unchecked, 3.1s Time] [2021-11-25 19:40:07,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23896 states. [2021-11-25 19:40:09,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23896 to 20148. [2021-11-25 19:40:09,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20148 states, 15183 states have (on average 1.4774418757821248) internal successors, (22432), 15603 states have internal predecessors, (22432), 3529 states have call successors, (3529), 1080 states have call predecessors, (3529), 1435 states have return successors, (7127), 3656 states have call predecessors, (7127), 3511 states have call successors, (7127) [2021-11-25 19:40:09,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20148 states to 20148 states and 33088 transitions. [2021-11-25 19:40:09,556 INFO L78 Accepts]: Start accepts. Automaton has 20148 states and 33088 transitions. Word has length 137 [2021-11-25 19:40:09,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:40:09,557 INFO L470 AbstractCegarLoop]: Abstraction has 20148 states and 33088 transitions. [2021-11-25 19:40:09,557 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 10.75) internal successors, (86), 8 states have internal predecessors, (86), 4 states have call successors, (23), 4 states have call predecessors, (23), 2 states have return successors, (21), 2 states have call predecessors, (21), 4 states have call successors, (21) [2021-11-25 19:40:09,557 INFO L276 IsEmpty]: Start isEmpty. Operand 20148 states and 33088 transitions. [2021-11-25 19:40:09,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-25 19:40:09,600 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:40:09,600 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:40:09,645 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-25 19:40:09,828 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-25 19:40:09,828 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:40:09,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:40:09,829 INFO L85 PathProgramCache]: Analyzing trace with hash -635319436, now seen corresponding path program 1 times [2021-11-25 19:40:09,829 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:40:09,829 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [137419057] [2021-11-25 19:40:09,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:40:09,829 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:40:09,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:40:09,987 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 20 proven. 2 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-25 19:40:09,987 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:40:09,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [137419057] [2021-11-25 19:40:09,988 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [137419057] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:40:09,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1345316972] [2021-11-25 19:40:09,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:40:09,989 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:40:09,989 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:40:09,990 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:40:10,016 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-25 19:40:10,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:40:10,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 1973 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 19:40:10,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:40:10,767 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 41 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-25 19:40:10,767 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:40:10,767 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1345316972] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:40:10,768 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:40:10,768 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8] total 9 [2021-11-25 19:40:10,768 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1725553188] [2021-11-25 19:40:10,768 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:40:10,769 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:40:10,769 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:40:10,769 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:40:10,769 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-25 19:40:10,770 INFO L87 Difference]: Start difference. First operand 20148 states and 33088 transitions. Second operand has 3 states, 3 states have (on average 28.0) internal successors, (84), 3 states have internal predecessors, (84), 2 states have call successors, (23), 2 states have call predecessors, (23), 2 states have return successors, (21), 2 states have call predecessors, (21), 2 states have call successors, (21) [2021-11-25 19:40:12,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:40:12,148 INFO L93 Difference]: Finished difference Result 40221 states and 68808 transitions. [2021-11-25 19:40:12,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:40:12,149 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.0) internal successors, (84), 3 states have internal predecessors, (84), 2 states have call successors, (23), 2 states have call predecessors, (23), 2 states have return successors, (21), 2 states have call predecessors, (21), 2 states have call successors, (21) Word has length 139 [2021-11-25 19:40:12,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:40:12,326 INFO L225 Difference]: With dead ends: 40221 [2021-11-25 19:40:12,327 INFO L226 Difference]: Without dead ends: 22533 [2021-11-25 19:40:12,587 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 146 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-25 19:40:12,589 INFO L933 BasicCegarLoop]: 765 mSDtfsCounter, 105 mSDsluCounter, 641 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 165 SdHoareTripleChecker+Valid, 1369 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:40:12,589 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [165 Valid, 1369 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:40:12,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22533 states. [2021-11-25 19:40:14,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22533 to 20344. [2021-11-25 19:40:14,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20344 states, 15351 states have (on average 1.4740407791023387) internal successors, (22628), 15771 states have internal predecessors, (22628), 3557 states have call successors, (3557), 1080 states have call predecessors, (3557), 1435 states have return successors, (7155), 3684 states have call predecessors, (7155), 3539 states have call successors, (7155) [2021-11-25 19:40:14,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20344 states to 20344 states and 33340 transitions. [2021-11-25 19:40:14,758 INFO L78 Accepts]: Start accepts. Automaton has 20344 states and 33340 transitions. Word has length 139 [2021-11-25 19:40:14,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:40:14,759 INFO L470 AbstractCegarLoop]: Abstraction has 20344 states and 33340 transitions. [2021-11-25 19:40:14,759 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.0) internal successors, (84), 3 states have internal predecessors, (84), 2 states have call successors, (23), 2 states have call predecessors, (23), 2 states have return successors, (21), 2 states have call predecessors, (21), 2 states have call successors, (21) [2021-11-25 19:40:14,759 INFO L276 IsEmpty]: Start isEmpty. Operand 20344 states and 33340 transitions. [2021-11-25 19:40:14,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2021-11-25 19:40:14,796 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:40:14,796 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-25 19:40:14,840 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-25 19:40:15,024 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-25 19:40:15,024 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:40:15,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:40:15,025 INFO L85 PathProgramCache]: Analyzing trace with hash 1344415957, now seen corresponding path program 1 times [2021-11-25 19:40:15,025 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:40:15,025 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1718371842] [2021-11-25 19:40:15,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:40:15,026 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:40:15,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:40:15,167 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 22 proven. 2 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-25 19:40:15,167 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:40:15,168 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1718371842] [2021-11-25 19:40:15,168 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1718371842] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:40:15,168 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1018952372] [2021-11-25 19:40:15,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:40:15,168 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:40:15,169 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:40:15,170 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:40:15,192 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-25 19:40:15,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:40:15,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 1973 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 19:40:15,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:40:15,906 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 53 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-25 19:40:15,906 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:40:15,907 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1018952372] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:40:15,907 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:40:15,907 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [8] total 14 [2021-11-25 19:40:15,907 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [900221118] [2021-11-25 19:40:15,907 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:40:15,908 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 19:40:15,908 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:40:15,908 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 19:40:15,909 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2021-11-25 19:40:15,909 INFO L87 Difference]: Start difference. First operand 20344 states and 33340 transitions. Second operand has 8 states, 7 states have (on average 12.285714285714286) internal successors, (86), 7 states have internal predecessors, (86), 5 states have call successors, (25), 4 states have call predecessors, (25), 5 states have return successors, (23), 6 states have call predecessors, (23), 5 states have call successors, (23) [2021-11-25 19:40:20,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:40:20,321 INFO L93 Difference]: Finished difference Result 43553 states and 72728 transitions. [2021-11-25 19:40:20,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-25 19:40:20,321 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 12.285714285714286) internal successors, (86), 7 states have internal predecessors, (86), 5 states have call successors, (25), 4 states have call predecessors, (25), 5 states have return successors, (23), 6 states have call predecessors, (23), 5 states have call successors, (23) Word has length 138 [2021-11-25 19:40:20,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:40:20,505 INFO L225 Difference]: With dead ends: 43553 [2021-11-25 19:40:20,505 INFO L226 Difference]: Without dead ends: 22778 [2021-11-25 19:40:20,637 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=96, Invalid=504, Unknown=0, NotChecked=0, Total=600 [2021-11-25 19:40:20,638 INFO L933 BasicCegarLoop]: 664 mSDtfsCounter, 1699 mSDsluCounter, 1481 mSDsCounter, 0 mSdLazyCounter, 3535 mSolverCounterSat, 1128 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1735 SdHoareTripleChecker+Valid, 2005 SdHoareTripleChecker+Invalid, 4663 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1128 IncrementalHoareTripleChecker+Valid, 3535 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2021-11-25 19:40:20,638 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1735 Valid, 2005 Invalid, 4663 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1128 Valid, 3535 Invalid, 0 Unknown, 0 Unchecked, 2.9s Time] [2021-11-25 19:40:20,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22778 states. [2021-11-25 19:40:22,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22778 to 20324. [2021-11-25 19:40:22,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20324 states, 15331 states have (on average 1.4743982779988258) internal successors, (22604), 15751 states have internal predecessors, (22604), 3557 states have call successors, (3557), 1080 states have call predecessors, (3557), 1435 states have return successors, (7155), 3684 states have call predecessors, (7155), 3539 states have call successors, (7155) [2021-11-25 19:40:22,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20324 states to 20324 states and 33316 transitions. [2021-11-25 19:40:22,396 INFO L78 Accepts]: Start accepts. Automaton has 20324 states and 33316 transitions. Word has length 138 [2021-11-25 19:40:22,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:40:22,396 INFO L470 AbstractCegarLoop]: Abstraction has 20324 states and 33316 transitions. [2021-11-25 19:40:22,396 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 12.285714285714286) internal successors, (86), 7 states have internal predecessors, (86), 5 states have call successors, (25), 4 states have call predecessors, (25), 5 states have return successors, (23), 6 states have call predecessors, (23), 5 states have call successors, (23) [2021-11-25 19:40:22,396 INFO L276 IsEmpty]: Start isEmpty. Operand 20324 states and 33316 transitions. [2021-11-25 19:40:22,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-25 19:40:22,429 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:40:22,429 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:40:22,472 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-25 19:40:22,644 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:40:22,644 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:40:22,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:40:22,645 INFO L85 PathProgramCache]: Analyzing trace with hash -1411564986, now seen corresponding path program 1 times [2021-11-25 19:40:22,645 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:40:22,645 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1948978899] [2021-11-25 19:40:22,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:40:22,645 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:40:22,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:40:22,913 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 22 proven. 5 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-25 19:40:22,913 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:40:22,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1948978899] [2021-11-25 19:40:22,914 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1948978899] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:40:22,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1937477366] [2021-11-25 19:40:22,914 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:40:22,914 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:40:22,915 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:40:22,920 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:40:22,927 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-25 19:40:23,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:40:23,312 INFO L263 TraceCheckSpWp]: Trace formula consists of 2000 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 19:40:23,321 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:40:23,563 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 65 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-25 19:40:23,563 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:40:23,563 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1937477366] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:40:23,563 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:40:23,564 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [12] total 13 [2021-11-25 19:40:23,564 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [963427941] [2021-11-25 19:40:23,564 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:40:23,564 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:40:23,565 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:40:23,565 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:40:23,565 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2021-11-25 19:40:23,565 INFO L87 Difference]: Start difference. First operand 20324 states and 33316 transitions. Second operand has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 3 states have internal predecessors, (89), 3 states have call successors, (27), 3 states have call predecessors, (27), 3 states have return successors, (25), 3 states have call predecessors, (25), 3 states have call successors, (25) [2021-11-25 19:40:25,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:40:25,360 INFO L93 Difference]: Finished difference Result 46508 states and 78816 transitions. [2021-11-25 19:40:25,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:40:25,360 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 3 states have internal predecessors, (89), 3 states have call successors, (27), 3 states have call predecessors, (27), 3 states have return successors, (25), 3 states have call predecessors, (25), 3 states have call successors, (25) Word has length 145 [2021-11-25 19:40:25,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:40:25,585 INFO L225 Difference]: With dead ends: 46508 [2021-11-25 19:40:25,585 INFO L226 Difference]: Without dead ends: 26196 [2021-11-25 19:40:25,755 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2021-11-25 19:40:25,756 INFO L933 BasicCegarLoop]: 758 mSDtfsCounter, 486 mSDsluCounter, 599 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 486 SdHoareTripleChecker+Valid, 1323 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:40:25,756 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [486 Valid, 1323 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 92 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:40:25,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26196 states. [2021-11-25 19:40:27,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26196 to 25854. [2021-11-25 19:40:27,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25854 states, 19580 states have (on average 1.4786006128702758) internal successors, (28951), 20110 states have internal predecessors, (28951), 4461 states have call successors, (4461), 1347 states have call predecessors, (4461), 1812 states have return successors, (9194), 4636 states have call predecessors, (9194), 4443 states have call successors, (9194) [2021-11-25 19:40:27,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25854 states to 25854 states and 42606 transitions. [2021-11-25 19:40:27,777 INFO L78 Accepts]: Start accepts. Automaton has 25854 states and 42606 transitions. Word has length 145 [2021-11-25 19:40:27,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:40:27,778 INFO L470 AbstractCegarLoop]: Abstraction has 25854 states and 42606 transitions. [2021-11-25 19:40:27,778 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 3 states have internal predecessors, (89), 3 states have call successors, (27), 3 states have call predecessors, (27), 3 states have return successors, (25), 3 states have call predecessors, (25), 3 states have call successors, (25) [2021-11-25 19:40:27,778 INFO L276 IsEmpty]: Start isEmpty. Operand 25854 states and 42606 transitions. [2021-11-25 19:40:27,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2021-11-25 19:40:27,812 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:40:27,812 INFO L514 BasicCegarLoop]: trace histogram [6, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:40:27,851 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-25 19:40:28,040 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-25 19:40:28,040 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:40:28,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:40:28,041 INFO L85 PathProgramCache]: Analyzing trace with hash 55216469, now seen corresponding path program 1 times [2021-11-25 19:40:28,041 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:40:28,041 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [878589166] [2021-11-25 19:40:28,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:40:28,042 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:40:28,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:40:28,249 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-25 19:40:28,249 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:40:28,250 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [878589166] [2021-11-25 19:40:28,250 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [878589166] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:40:28,250 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1353488977] [2021-11-25 19:40:28,250 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:40:28,250 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:40:28,251 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:40:28,252 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:40:28,260 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-25 19:40:28,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:40:28,603 INFO L263 TraceCheckSpWp]: Trace formula consists of 1830 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 19:40:28,609 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:40:28,932 INFO L134 CoverageAnalysis]: Checked inductivity of 69 backedges. 47 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-25 19:40:28,932 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:40:28,933 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1353488977] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:40:28,933 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:40:28,933 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [10] total 10 [2021-11-25 19:40:28,933 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [970224035] [2021-11-25 19:40:28,934 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:40:28,934 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:40:28,934 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:40:28,935 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:40:28,935 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-11-25 19:40:28,935 INFO L87 Difference]: Start difference. First operand 25854 states and 42606 transitions. Second operand has 3 states, 3 states have (on average 37.0) internal successors, (111), 3 states have internal predecessors, (111), 3 states have call successors, (28), 3 states have call predecessors, (28), 3 states have return successors, (26), 3 states have call predecessors, (26), 3 states have call successors, (26) [2021-11-25 19:40:31,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:40:31,057 INFO L93 Difference]: Finished difference Result 59839 states and 100186 transitions. [2021-11-25 19:40:31,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:40:31,057 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.0) internal successors, (111), 3 states have internal predecessors, (111), 3 states have call successors, (28), 3 states have call predecessors, (28), 3 states have return successors, (26), 3 states have call predecessors, (26), 3 states have call successors, (26) Word has length 172 [2021-11-25 19:40:31,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:40:31,338 INFO L225 Difference]: With dead ends: 59839 [2021-11-25 19:40:31,339 INFO L226 Difference]: Without dead ends: 33973 [2021-11-25 19:40:31,524 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 174 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-11-25 19:40:31,526 INFO L933 BasicCegarLoop]: 735 mSDtfsCounter, 537 mSDsluCounter, 587 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 537 SdHoareTripleChecker+Valid, 1293 SdHoareTripleChecker+Invalid, 88 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:40:31,526 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [537 Valid, 1293 Invalid, 88 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:40:31,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33973 states. [2021-11-25 19:40:33,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33973 to 33731. [2021-11-25 19:40:33,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33731 states, 25445 states have (on average 1.481194733739438) internal successors, (37689), 26223 states have internal predecessors, (37689), 5921 states have call successors, (5921), 1770 states have call predecessors, (5921), 2364 states have return successors, (12338), 6085 states have call predecessors, (12338), 5899 states have call successors, (12338) [2021-11-25 19:40:33,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33731 states to 33731 states and 55948 transitions. [2021-11-25 19:40:33,815 INFO L78 Accepts]: Start accepts. Automaton has 33731 states and 55948 transitions. Word has length 172 [2021-11-25 19:40:33,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:40:33,815 INFO L470 AbstractCegarLoop]: Abstraction has 33731 states and 55948 transitions. [2021-11-25 19:40:33,815 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.0) internal successors, (111), 3 states have internal predecessors, (111), 3 states have call successors, (28), 3 states have call predecessors, (28), 3 states have return successors, (26), 3 states have call predecessors, (26), 3 states have call successors, (26) [2021-11-25 19:40:33,815 INFO L276 IsEmpty]: Start isEmpty. Operand 33731 states and 55948 transitions. [2021-11-25 19:40:33,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2021-11-25 19:40:33,830 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:40:33,830 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:40:33,873 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-25 19:40:34,044 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-25 19:40:34,044 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:40:34,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:40:34,045 INFO L85 PathProgramCache]: Analyzing trace with hash -741429991, now seen corresponding path program 1 times [2021-11-25 19:40:34,045 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:40:34,045 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [552895084] [2021-11-25 19:40:34,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:40:34,045 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:40:34,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:40:34,215 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-25 19:40:34,216 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:40:34,216 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [552895084] [2021-11-25 19:40:34,216 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [552895084] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:40:34,216 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1160357711] [2021-11-25 19:40:34,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:40:34,217 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:40:34,217 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:40:34,218 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:40:34,239 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-25 19:40:34,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:40:34,531 INFO L263 TraceCheckSpWp]: Trace formula consists of 1806 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 19:40:34,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:40:34,891 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 21 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-25 19:40:34,891 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:40:35,533 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-25 19:40:35,533 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1160357711] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:40:35,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [965687726] [2021-11-25 19:40:35,570 INFO L159 IcfgInterpreter]: Started Sifa with 129 locations of interest [2021-11-25 19:40:35,571 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:40:35,580 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:40:35,587 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:40:35,587 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:40:41,818 INFO L197 IcfgInterpreter]: Interpreting procedure timeShift with input of size 572 for LOIs [2021-11-25 19:40:48,228 INFO L197 IcfgInterpreter]: Interpreting procedure buttonForFloorIsPressed with input of size 499 for LOIs [2021-11-25 19:40:48,568 INFO L197 IcfgInterpreter]: Interpreting procedure initTopDown with input of size 599 for LOIs [2021-11-25 19:40:50,458 INFO L197 IcfgInterpreter]: Interpreting procedure initFloors with input of size 573 for LOIs [2021-11-25 19:40:50,629 INFO L197 IcfgInterpreter]: Interpreting procedure getCurrentFloorID with input of size 437 for LOIs [2021-11-25 19:40:50,706 INFO L197 IcfgInterpreter]: Interpreting procedure getCurrentHeading with input of size 437 for LOIs [2021-11-25 19:40:50,784 INFO L197 IcfgInterpreter]: Interpreting procedure bobCall with input of size 573 for LOIs [2021-11-25 19:40:54,283 INFO L197 IcfgInterpreter]: Interpreting procedure initPersonOnFloor with input of size 577 for LOIs [2021-11-25 19:40:54,878 INFO L197 IcfgInterpreter]: Interpreting procedure getOrigin with input of size 505 for LOIs [2021-11-25 19:40:55,017 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:41:21,418 WARN L227 SmtUtils]: Spent 5.54s on a formula simplification. DAG size of input: 645 DAG size of output: 592 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 19:41:27,238 WARN L227 SmtUtils]: Spent 5.54s on a formula simplification. DAG size of input: 645 DAG size of output: 592 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 19:42:37,714 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [965687726] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:42:37,714 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:42:37,714 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [10, 6, 7] total 44 [2021-11-25 19:42:37,715 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [423135829] [2021-11-25 19:42:37,715 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:42:37,716 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-25 19:42:37,716 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:42:37,716 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-25 19:42:37,717 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=1684, Unknown=0, NotChecked=0, Total=1892 [2021-11-25 19:42:37,717 INFO L87 Difference]: Start difference. First operand 33731 states and 55948 transitions. Second operand has 29 states, 21 states have (on average 4.238095238095238) internal successors, (89), 17 states have internal predecessors, (89), 11 states have call successors, (26), 8 states have call predecessors, (26), 9 states have return successors, (24), 10 states have call predecessors, (24), 10 states have call successors, (24) [2021-11-25 19:43:35,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:43:35,889 INFO L93 Difference]: Finished difference Result 67583 states and 112075 transitions. [2021-11-25 19:43:35,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-25 19:43:35,890 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 21 states have (on average 4.238095238095238) internal successors, (89), 17 states have internal predecessors, (89), 11 states have call successors, (26), 8 states have call predecessors, (26), 9 states have return successors, (24), 10 states have call predecessors, (24), 10 states have call successors, (24) Word has length 156 [2021-11-25 19:43:35,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:43:36,191 INFO L225 Difference]: With dead ends: 67583 [2021-11-25 19:43:36,191 INFO L226 Difference]: Without dead ends: 33864 [2021-11-25 19:43:36,488 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 483 GetRequests, 426 SyntacticMatches, 9 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 516 ImplicationChecksByTransitivity, 131.4s TimeCoverageRelationStatistics Valid=256, Invalid=2194, Unknown=0, NotChecked=0, Total=2450 [2021-11-25 19:43:36,489 INFO L933 BasicCegarLoop]: 658 mSDtfsCounter, 300 mSDsluCounter, 4109 mSDsCounter, 0 mSdLazyCounter, 6111 mSolverCounterSat, 97 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 25.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 317 SdHoareTripleChecker+Valid, 4677 SdHoareTripleChecker+Invalid, 6208 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 97 IncrementalHoareTripleChecker+Valid, 6111 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 27.7s IncrementalHoareTripleChecker+Time [2021-11-25 19:43:36,492 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [317 Valid, 4677 Invalid, 6208 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [97 Valid, 6111 Invalid, 0 Unknown, 0 Unchecked, 27.7s Time] [2021-11-25 19:43:36,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33864 states. [2021-11-25 19:43:38,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33864 to 33785. [2021-11-25 19:43:38,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33785 states, 25485 states have (on average 1.4806356680400234) internal successors, (37734), 26262 states have internal predecessors, (37734), 5930 states have call successors, (5930), 1776 states have call predecessors, (5930), 2369 states have return successors, (12347), 6094 states have call predecessors, (12347), 5908 states have call successors, (12347) [2021-11-25 19:43:38,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33785 states to 33785 states and 56011 transitions. [2021-11-25 19:43:38,842 INFO L78 Accepts]: Start accepts. Automaton has 33785 states and 56011 transitions. Word has length 156 [2021-11-25 19:43:38,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:43:38,842 INFO L470 AbstractCegarLoop]: Abstraction has 33785 states and 56011 transitions. [2021-11-25 19:43:38,843 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 21 states have (on average 4.238095238095238) internal successors, (89), 17 states have internal predecessors, (89), 11 states have call successors, (26), 8 states have call predecessors, (26), 9 states have return successors, (24), 10 states have call predecessors, (24), 10 states have call successors, (24) [2021-11-25 19:43:38,843 INFO L276 IsEmpty]: Start isEmpty. Operand 33785 states and 56011 transitions. [2021-11-25 19:43:38,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2021-11-25 19:43:38,857 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:43:38,857 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:43:38,884 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-25 19:43:39,059 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:43:39,059 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:43:39,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:43:39,060 INFO L85 PathProgramCache]: Analyzing trace with hash -22829771, now seen corresponding path program 1 times [2021-11-25 19:43:39,060 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:43:39,060 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [313748507] [2021-11-25 19:43:39,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:43:39,060 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:43:39,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:43:39,461 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-25 19:43:39,462 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:43:39,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [313748507] [2021-11-25 19:43:39,462 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [313748507] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:43:39,462 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:43:39,462 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-25 19:43:39,463 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1071499170] [2021-11-25 19:43:39,463 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:43:39,464 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 19:43:39,464 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:43:39,465 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 19:43:39,466 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-25 19:43:39,467 INFO L87 Difference]: Start difference. First operand 33785 states and 56011 transitions. Second operand has 7 states, 7 states have (on average 13.571428571428571) internal successors, (95), 5 states have internal predecessors, (95), 2 states have call successors, (27), 2 states have call predecessors, (27), 3 states have return successors, (26), 4 states have call predecessors, (26), 2 states have call successors, (26) [2021-11-25 19:43:41,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:43:41,364 INFO L93 Difference]: Finished difference Result 66543 states and 112523 transitions. [2021-11-25 19:43:41,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 19:43:41,365 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 13.571428571428571) internal successors, (95), 5 states have internal predecessors, (95), 2 states have call successors, (27), 2 states have call predecessors, (27), 3 states have return successors, (26), 4 states have call predecessors, (26), 2 states have call successors, (26) Word has length 162 [2021-11-25 19:43:41,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:43:41,637 INFO L225 Difference]: With dead ends: 66543 [2021-11-25 19:43:41,637 INFO L226 Difference]: Without dead ends: 35641 [2021-11-25 19:43:42,257 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-25 19:43:42,262 INFO L933 BasicCegarLoop]: 600 mSDtfsCounter, 13 mSDsluCounter, 3149 mSDsCounter, 0 mSdLazyCounter, 266 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 3562 SdHoareTripleChecker+Invalid, 268 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 266 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:43:42,263 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 3562 Invalid, 268 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 266 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:43:42,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35641 states. [2021-11-25 19:43:44,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35641 to 34885. [2021-11-25 19:43:44,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34885 states, 26197 states have (on average 1.4675726228194068) internal successors, (38446), 27130 states have internal predecessors, (38446), 5934 states have call successors, (5934), 1776 states have call predecessors, (5934), 2753 states have return successors, (12923), 6326 states have call predecessors, (12923), 5912 states have call successors, (12923) [2021-11-25 19:43:44,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34885 states to 34885 states and 57303 transitions. [2021-11-25 19:43:44,514 INFO L78 Accepts]: Start accepts. Automaton has 34885 states and 57303 transitions. Word has length 162 [2021-11-25 19:43:44,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:43:44,515 INFO L470 AbstractCegarLoop]: Abstraction has 34885 states and 57303 transitions. [2021-11-25 19:43:44,515 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 13.571428571428571) internal successors, (95), 5 states have internal predecessors, (95), 2 states have call successors, (27), 2 states have call predecessors, (27), 3 states have return successors, (26), 4 states have call predecessors, (26), 2 states have call successors, (26) [2021-11-25 19:43:44,516 INFO L276 IsEmpty]: Start isEmpty. Operand 34885 states and 57303 transitions. [2021-11-25 19:43:44,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2021-11-25 19:43:44,529 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:43:44,529 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:43:44,529 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-11-25 19:43:44,530 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:43:44,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:43:44,530 INFO L85 PathProgramCache]: Analyzing trace with hash 1718046903, now seen corresponding path program 1 times [2021-11-25 19:43:44,531 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:43:44,531 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [914309024] [2021-11-25 19:43:44,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:43:44,531 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:43:44,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:43:44,699 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 12 proven. 1 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-25 19:43:44,699 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:43:44,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [914309024] [2021-11-25 19:43:44,699 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [914309024] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:43:44,700 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2056281872] [2021-11-25 19:43:44,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:43:44,700 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:43:44,700 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:43:44,701 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:43:44,712 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-25 19:43:45,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:43:45,069 INFO L263 TraceCheckSpWp]: Trace formula consists of 1822 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-25 19:43:45,077 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:43:45,609 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 26 proven. 3 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-25 19:43:45,610 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:43:47,819 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-25 19:43:47,819 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2056281872] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:43:47,819 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1230204025] [2021-11-25 19:43:47,825 INFO L159 IcfgInterpreter]: Started Sifa with 133 locations of interest [2021-11-25 19:43:47,825 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:43:47,826 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:43:47,826 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:43:47,827 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:43:51,856 INFO L197 IcfgInterpreter]: Interpreting procedure timeShift with input of size 572 for LOIs [2021-11-25 19:43:59,860 INFO L197 IcfgInterpreter]: Interpreting procedure buttonForFloorIsPressed with input of size 60 for LOIs [2021-11-25 19:43:59,875 INFO L197 IcfgInterpreter]: Interpreting procedure initTopDown with input of size 599 for LOIs [2021-11-25 19:44:01,800 INFO L197 IcfgInterpreter]: Interpreting procedure initFloors with input of size 573 for LOIs [2021-11-25 19:44:01,977 INFO L197 IcfgInterpreter]: Interpreting procedure getCurrentFloorID with input of size 437 for LOIs [2021-11-25 19:44:02,052 INFO L197 IcfgInterpreter]: Interpreting procedure getCurrentHeading with input of size 437 for LOIs [2021-11-25 19:44:02,127 INFO L197 IcfgInterpreter]: Interpreting procedure bobCall with input of size 573 for LOIs [2021-11-25 19:44:05,526 INFO L197 IcfgInterpreter]: Interpreting procedure initPersonOnFloor with input of size 577 for LOIs [2021-11-25 19:44:06,074 INFO L197 IcfgInterpreter]: Interpreting procedure getOrigin with input of size 505 for LOIs [2021-11-25 19:44:06,215 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:44:33,419 WARN L227 SmtUtils]: Spent 5.74s on a formula simplification. DAG size of input: 645 DAG size of output: 592 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 19:44:39,284 WARN L227 SmtUtils]: Spent 5.51s on a formula simplification. DAG size of input: 645 DAG size of output: 592 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 19:45:48,009 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1230204025] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:45:48,009 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:45:48,009 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [30] imperfect sequences [10, 9, 10] total 53 [2021-11-25 19:45:48,010 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [737444933] [2021-11-25 19:45:48,010 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:45:48,010 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-25 19:45:48,010 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:45:48,011 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-25 19:45:48,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=256, Invalid=2500, Unknown=0, NotChecked=0, Total=2756 [2021-11-25 19:45:48,012 INFO L87 Difference]: Start difference. First operand 34885 states and 57303 transitions. Second operand has 31 states, 23 states have (on average 4.043478260869565) internal successors, (93), 18 states have internal predecessors, (93), 12 states have call successors, (27), 8 states have call predecessors, (27), 9 states have return successors, (25), 11 states have call predecessors, (25), 11 states have call successors, (25) [2021-11-25 19:46:45,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:46:45,810 INFO L93 Difference]: Finished difference Result 69761 states and 114623 transitions. [2021-11-25 19:46:45,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-25 19:46:45,811 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 23 states have (on average 4.043478260869565) internal successors, (93), 18 states have internal predecessors, (93), 12 states have call successors, (27), 8 states have call predecessors, (27), 9 states have return successors, (25), 11 states have call predecessors, (25), 11 states have call successors, (25) Word has length 166 [2021-11-25 19:46:45,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:46:46,056 INFO L225 Difference]: With dead ends: 69761 [2021-11-25 19:46:46,057 INFO L226 Difference]: Without dead ends: 34954 [2021-11-25 19:46:46,280 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 513 GetRequests, 445 SyntacticMatches, 11 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 973 ImplicationChecksByTransitivity, 127.8s TimeCoverageRelationStatistics Valid=302, Invalid=3120, Unknown=0, NotChecked=0, Total=3422 [2021-11-25 19:46:46,283 INFO L933 BasicCegarLoop]: 655 mSDtfsCounter, 182 mSDsluCounter, 6541 mSDsCounter, 0 mSdLazyCounter, 8159 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 28.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 199 SdHoareTripleChecker+Valid, 7054 SdHoareTripleChecker+Invalid, 8224 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 8159 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 30.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:46:46,283 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [199 Valid, 7054 Invalid, 8224 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [65 Valid, 8159 Invalid, 0 Unknown, 0 Unchecked, 30.2s Time] [2021-11-25 19:46:46,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34954 states. [2021-11-25 19:46:47,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34954 to 34887. [2021-11-25 19:46:47,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34887 states, 26198 states have (on average 1.4675166043209404) internal successors, (38446), 27131 states have internal predecessors, (38446), 5934 states have call successors, (5934), 1777 states have call predecessors, (5934), 2754 states have return successors, (12923), 6326 states have call predecessors, (12923), 5912 states have call successors, (12923) [2021-11-25 19:46:47,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34887 states to 34887 states and 57303 transitions. [2021-11-25 19:46:47,972 INFO L78 Accepts]: Start accepts. Automaton has 34887 states and 57303 transitions. Word has length 166 [2021-11-25 19:46:47,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:46:47,972 INFO L470 AbstractCegarLoop]: Abstraction has 34887 states and 57303 transitions. [2021-11-25 19:46:47,973 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 23 states have (on average 4.043478260869565) internal successors, (93), 18 states have internal predecessors, (93), 12 states have call successors, (27), 8 states have call predecessors, (27), 9 states have return successors, (25), 11 states have call predecessors, (25), 11 states have call successors, (25) [2021-11-25 19:46:47,973 INFO L276 IsEmpty]: Start isEmpty. Operand 34887 states and 57303 transitions. [2021-11-25 19:46:47,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2021-11-25 19:46:47,992 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:46:47,993 INFO L514 BasicCegarLoop]: trace histogram [7, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:46:48,021 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2021-11-25 19:46:48,200 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-11-25 19:46:48,201 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:46:48,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:46:48,201 INFO L85 PathProgramCache]: Analyzing trace with hash 2025481213, now seen corresponding path program 1 times [2021-11-25 19:46:48,201 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:46:48,201 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [170071412] [2021-11-25 19:46:48,201 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:46:48,202 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:46:48,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:46:48,693 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 21 proven. 5 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-11-25 19:46:48,693 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:46:48,693 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [170071412] [2021-11-25 19:46:48,693 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [170071412] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:46:48,693 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [290719441] [2021-11-25 19:46:48,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:46:48,694 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:46:48,694 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:46:48,695 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:46:48,720 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-25 19:46:49,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:46:49,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 2032 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 19:46:49,033 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:46:49,286 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 65 proven. 1 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-25 19:46:49,286 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:46:49,638 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 26 proven. 1 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2021-11-25 19:46:49,638 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [290719441] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:46:49,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1148823507] [2021-11-25 19:46:49,642 INFO L159 IcfgInterpreter]: Started Sifa with 101 locations of interest [2021-11-25 19:46:49,642 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:46:49,643 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:46:49,644 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:46:49,644 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:46:57,586 INFO L197 IcfgInterpreter]: Interpreting procedure timeShift with input of size 92 for LOIs [2021-11-25 19:47:03,010 INFO L197 IcfgInterpreter]: Interpreting procedure __automaton_fail with input of size 36 for LOIs [2021-11-25 19:47:03,013 INFO L197 IcfgInterpreter]: Interpreting procedure stopRequestedInDirection with input of size 46 for LOIs [2021-11-25 19:47:03,370 INFO L197 IcfgInterpreter]: Interpreting procedure stopRequestedInDirection__wrappee__weight with input of size 62 for LOIs [2021-11-25 19:47:03,536 INFO L197 IcfgInterpreter]: Interpreting procedure isFloorCalling with input of size 59 for LOIs [2021-11-25 19:47:03,548 INFO L197 IcfgInterpreter]: Interpreting procedure buttonForFloorIsPressed with input of size 58 for LOIs [2021-11-25 19:47:03,565 INFO L197 IcfgInterpreter]: Interpreting procedure initTopDown with input of size 599 for LOIs [2021-11-25 19:47:05,364 INFO L197 IcfgInterpreter]: Interpreting procedure initFloors with input of size 573 for LOIs [2021-11-25 19:47:05,530 INFO L197 IcfgInterpreter]: Interpreting procedure getCurrentFloorID with input of size 71 for LOIs [2021-11-25 19:47:05,545 INFO L197 IcfgInterpreter]: Interpreting procedure continueInDirection with input of size 45 for LOIs [2021-11-25 19:47:05,562 INFO L197 IcfgInterpreter]: Interpreting procedure getCurrentHeading with input of size 48 for LOIs [2021-11-25 19:47:05,570 INFO L197 IcfgInterpreter]: Interpreting procedure bobCall with input of size 573 for LOIs [2021-11-25 19:47:08,863 INFO L197 IcfgInterpreter]: Interpreting procedure initPersonOnFloor with input of size 577 for LOIs [2021-11-25 19:47:09,406 INFO L197 IcfgInterpreter]: Interpreting procedure getOrigin with input of size 505 for LOIs [2021-11-25 19:47:09,542 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:47:35,515 WARN L227 SmtUtils]: Spent 5.51s on a formula simplification. DAG size of input: 645 DAG size of output: 592 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 19:47:41,276 WARN L227 SmtUtils]: Spent 5.44s on a formula simplification. DAG size of input: 645 DAG size of output: 592 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 19:48:21,164 WARN L227 SmtUtils]: Spent 7.52s on a formula simplification. DAG size of input: 454 DAG size of output: 443 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-25 19:48:25,988 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1157303#(and (= ~currentHeading~0 0) (= ~head~0.offset 0) (<= ~floorButtons_0~0 2147483647) (= ~expectedDirection~0 1) (= ~head~0.base 0) (= |#NULL.offset| 0) (<= 0 (+ ~floorButtons_0~0 2147483648)) (not (= ~doorState~0 1)) (not (= (+ ~currentFloorID~0 1) 0)) (<= 0 |#StackHeapBarrier|) (= ~maximumWeight~0 100) (= ~cleanupTimeShifts~0 12) (= |#NULL.base| 0))' at error location [2021-11-25 19:48:25,988 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:48:25,989 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:48:25,989 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 6, 7] total 26 [2021-11-25 19:48:25,989 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [919958805] [2021-11-25 19:48:25,989 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:48:25,990 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-25 19:48:25,990 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:48:25,990 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-25 19:48:25,993 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=883, Invalid=11327, Unknown=0, NotChecked=0, Total=12210 [2021-11-25 19:48:25,993 INFO L87 Difference]: Start difference. First operand 34887 states and 57303 transitions. Second operand has 26 states, 18 states have (on average 9.11111111111111) internal successors, (164), 22 states have internal predecessors, (164), 13 states have call successors, (58), 5 states have call predecessors, (58), 14 states have return successors, (60), 16 states have call predecessors, (60), 13 states have call successors, (60) [2021-11-25 19:48:41,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:48:41,618 INFO L93 Difference]: Finished difference Result 94394 states and 171824 transitions. [2021-11-25 19:48:41,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-11-25 19:48:41,621 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 18 states have (on average 9.11111111111111) internal successors, (164), 22 states have internal predecessors, (164), 13 states have call successors, (58), 5 states have call predecessors, (58), 14 states have return successors, (60), 16 states have call predecessors, (60), 13 states have call successors, (60) Word has length 158 [2021-11-25 19:48:41,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:48:42,031 INFO L225 Difference]: With dead ends: 94394 [2021-11-25 19:48:42,031 INFO L226 Difference]: Without dead ends: 62247 [2021-11-25 19:48:42,474 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 572 GetRequests, 399 SyntacticMatches, 9 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10808 ImplicationChecksByTransitivity, 78.4s TimeCoverageRelationStatistics Valid=1916, Invalid=25474, Unknown=0, NotChecked=0, Total=27390 [2021-11-25 19:48:42,475 INFO L933 BasicCegarLoop]: 955 mSDtfsCounter, 6506 mSDsluCounter, 6596 mSDsCounter, 0 mSdLazyCounter, 20174 mSolverCounterSat, 4143 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6506 SdHoareTripleChecker+Valid, 6973 SdHoareTripleChecker+Invalid, 24317 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 4143 IncrementalHoareTripleChecker+Valid, 20174 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:48:42,475 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6506 Valid, 6973 Invalid, 24317 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [4143 Valid, 20174 Invalid, 0 Unknown, 0 Unchecked, 10.1s Time] [2021-11-25 19:48:42,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62247 states. [2021-11-25 19:48:46,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62247 to 58199. [2021-11-25 19:48:46,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58199 states, 41514 states have (on average 1.4091872621284387) internal successors, (58501), 43753 states have internal predecessors, (58501), 11541 states have call successors, (11541), 3719 states have call predecessors, (11541), 5143 states have return successors, (25571), 11602 states have call predecessors, (25571), 11501 states have call successors, (25571) [2021-11-25 19:48:47,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58199 states to 58199 states and 95613 transitions. [2021-11-25 19:48:47,036 INFO L78 Accepts]: Start accepts. Automaton has 58199 states and 95613 transitions. Word has length 158 [2021-11-25 19:48:47,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:48:47,036 INFO L470 AbstractCegarLoop]: Abstraction has 58199 states and 95613 transitions. [2021-11-25 19:48:47,037 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 18 states have (on average 9.11111111111111) internal successors, (164), 22 states have internal predecessors, (164), 13 states have call successors, (58), 5 states have call predecessors, (58), 14 states have return successors, (60), 16 states have call predecessors, (60), 13 states have call successors, (60) [2021-11-25 19:48:47,037 INFO L276 IsEmpty]: Start isEmpty. Operand 58199 states and 95613 transitions. [2021-11-25 19:48:47,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2021-11-25 19:48:47,048 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:48:47,048 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:48:47,090 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-25 19:48:47,276 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:48:47,277 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:48:47,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:48:47,278 INFO L85 PathProgramCache]: Analyzing trace with hash 587769514, now seen corresponding path program 1 times [2021-11-25 19:48:47,278 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:48:47,278 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [981115127] [2021-11-25 19:48:47,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:48:47,278 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:48:47,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:48:47,439 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 20 proven. 1 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-11-25 19:48:47,439 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:48:47,439 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [981115127] [2021-11-25 19:48:47,440 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [981115127] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:48:47,440 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1485263226] [2021-11-25 19:48:47,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:48:47,440 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:48:47,440 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:48:47,441 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:48:47,472 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4d1bcd49-e314-4d22-8090-bd0bc6bd1bfd/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-25 19:48:47,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:48:47,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 1859 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-25 19:48:47,825 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:48:48,364 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 43 proven. 3 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-25 19:48:48,364 INFO L328 TraceCheckSpWp]: Computing backward predicates...