./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/eca-rers2012/Problem03_label02.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_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/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_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/eca-rers2012/Problem03_label02.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/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_f953eb42-685d-44cf-aa70-c99e0d570420/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 940f009ebef4e6f688860c69fe317a06471b0d96e24220f1e9007ff15bc7124f --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 19:46:22,621 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 19:46:22,623 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 19:46:22,660 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 19:46:22,660 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 19:46:22,662 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 19:46:22,663 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 19:46:22,666 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 19:46:22,668 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 19:46:22,669 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 19:46:22,671 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 19:46:22,672 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 19:46:22,673 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 19:46:22,674 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 19:46:22,676 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 19:46:22,678 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 19:46:22,679 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 19:46:22,682 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 19:46:22,684 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 19:46:22,688 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 19:46:22,694 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 19:46:22,699 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 19:46:22,700 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 19:46:22,702 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 19:46:22,707 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 19:46:22,711 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 19:46:22,712 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 19:46:22,713 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 19:46:22,714 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 19:46:22,716 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 19:46:22,717 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 19:46:22,718 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 19:46:22,719 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 19:46:22,721 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 19:46:22,722 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 19:46:22,722 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 19:46:22,723 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 19:46:22,723 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 19:46:22,724 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 19:46:22,725 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 19:46:22,725 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 19:46:22,726 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 19:46:22,776 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 19:46:22,779 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 19:46:22,779 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 19:46:22,780 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 19:46:22,786 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 19:46:22,787 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 19:46:22,787 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 19:46:22,787 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 19:46:22,787 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 19:46:22,788 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 19:46:22,789 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 19:46:22,789 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 19:46:22,789 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 19:46:22,789 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 19:46:22,790 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 19:46:22,790 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 19:46:22,790 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 19:46:22,790 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 19:46:22,791 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 19:46:22,791 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 19:46:22,791 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 19:46:22,792 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 19:46:22,792 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 19:46:22,792 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 19:46:22,792 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 19:46:22,793 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 19:46:22,793 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 19:46:22,793 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 19:46:22,793 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 19:46:22,794 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 19:46:22,794 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 19:46:22,794 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 19:46:22,794 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:46:22,795 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 19:46:22,795 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 19:46:22,795 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 19:46:22,795 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 19:46:22,796 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 19:46:22,796 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 19:46:22,796 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 19:46:22,796 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 19:46:22,797 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_f953eb42-685d-44cf-aa70-c99e0d570420/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 940f009ebef4e6f688860c69fe317a06471b0d96e24220f1e9007ff15bc7124f [2021-11-25 19:46:23,052 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 19:46:23,078 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 19:46:23,081 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 19:46:23,082 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 19:46:23,083 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 19:46:23,084 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/eca-rers2012/Problem03_label02.c [2021-11-25 19:46:23,151 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/data/304d7ba98/4320f6180e644d98aa1e3a167242d53d/FLAG20e972be6 [2021-11-25 19:46:23,954 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 19:46:23,955 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/sv-benchmarks/c/eca-rers2012/Problem03_label02.c [2021-11-25 19:46:23,971 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/data/304d7ba98/4320f6180e644d98aa1e3a167242d53d/FLAG20e972be6 [2021-11-25 19:46:24,169 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/data/304d7ba98/4320f6180e644d98aa1e3a167242d53d [2021-11-25 19:46:24,171 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 19:46:24,172 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 19:46:24,174 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 19:46:24,174 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 19:46:24,189 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 19:46:24,189 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:46:24" (1/1) ... [2021-11-25 19:46:24,190 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1af67325 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:46:24, skipping insertion in model container [2021-11-25 19:46:24,190 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:46:24" (1/1) ... [2021-11-25 19:46:24,197 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 19:46:24,289 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 19:46:25,008 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/sv-benchmarks/c/eca-rers2012/Problem03_label02.c[61770,61783] [2021-11-25 19:46:25,033 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:46:25,042 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 19:46:25,405 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_f953eb42-685d-44cf-aa70-c99e0d570420/sv-benchmarks/c/eca-rers2012/Problem03_label02.c[61770,61783] [2021-11-25 19:46:25,410 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:46:25,429 INFO L208 MainTranslator]: Completed translation [2021-11-25 19:46:25,429 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:46:25 WrapperNode [2021-11-25 19:46:25,430 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 19:46:25,431 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 19:46:25,431 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 19:46:25,431 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 19:46:25,438 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:46:25" (1/1) ... [2021-11-25 19:46:25,487 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:46:25" (1/1) ... [2021-11-25 19:46:25,592 INFO L137 Inliner]: procedures = 14, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 1771 [2021-11-25 19:46:25,592 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 19:46:25,593 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 19:46:25,594 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 19:46:25,594 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 19:46:25,602 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:46:25" (1/1) ... [2021-11-25 19:46:25,602 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:46:25" (1/1) ... [2021-11-25 19:46:25,610 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:46:25" (1/1) ... [2021-11-25 19:46:25,611 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:46:25" (1/1) ... [2021-11-25 19:46:25,656 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:46:25" (1/1) ... [2021-11-25 19:46:25,686 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:46:25" (1/1) ... [2021-11-25 19:46:25,696 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:46:25" (1/1) ... [2021-11-25 19:46:25,716 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 19:46:25,717 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 19:46:25,717 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 19:46:25,717 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 19:46:25,718 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:46:25" (1/1) ... [2021-11-25 19:46:25,725 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:46:25,734 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:46:25,743 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 19:46:25,750 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 19:46:25,791 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 19:46:25,791 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 19:46:25,791 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 19:46:25,791 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 19:46:25,910 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 19:46:25,912 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 19:46:27,451 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 19:46:27,749 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 19:46:27,749 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-25 19:46:27,753 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:46:27 BoogieIcfgContainer [2021-11-25 19:46:27,753 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 19:46:27,755 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 19:46:27,755 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 19:46:27,758 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 19:46:27,758 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 07:46:24" (1/3) ... [2021-11-25 19:46:27,759 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5a4e1b48 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:46:27, skipping insertion in model container [2021-11-25 19:46:27,759 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:46:25" (2/3) ... [2021-11-25 19:46:27,759 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5a4e1b48 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:46:27, skipping insertion in model container [2021-11-25 19:46:27,759 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:46:27" (3/3) ... [2021-11-25 19:46:27,761 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem03_label02.c [2021-11-25 19:46:27,766 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 19:46:27,766 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 19:46:27,826 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 19:46:27,835 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 19:46:27,835 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 19:46:27,865 INFO L276 IsEmpty]: Start isEmpty. Operand has 148 states, 146 states have (on average 1.9726027397260273) internal successors, (288), 147 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:27,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-25 19:46:27,886 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:46:27,887 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 19:46:27,888 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:46:27,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:46:27,893 INFO L85 PathProgramCache]: Analyzing trace with hash 209358141, now seen corresponding path program 1 times [2021-11-25 19:46:27,904 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:46:27,905 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1705859710] [2021-11-25 19:46:27,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:46:27,907 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:46:28,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:46:28,577 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:46:28,578 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:46:28,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1705859710] [2021-11-25 19:46:28,579 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1705859710] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:46:28,579 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:46:28,579 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 19:46:28,580 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1063301375] [2021-11-25 19:46:28,581 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:46:28,587 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:46:28,587 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:46:28,617 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:46:28,618 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:46:28,623 INFO L87 Difference]: Start difference. First operand has 148 states, 146 states have (on average 1.9726027397260273) internal successors, (288), 147 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:29,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:46:29,542 INFO L93 Difference]: Finished difference Result 440 states and 860 transitions. [2021-11-25 19:46:29,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:46:29,544 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 143 [2021-11-25 19:46:29,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:46:29,561 INFO L225 Difference]: With dead ends: 440 [2021-11-25 19:46:29,562 INFO L226 Difference]: Without dead ends: 289 [2021-11-25 19:46:29,565 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:46:29,569 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 38 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 506 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 576 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 506 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 19:46:29,570 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 49 Invalid, 576 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 506 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-25 19:46:29,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2021-11-25 19:46:29,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 289. [2021-11-25 19:46:29,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 289 states, 288 states have (on average 1.8055555555555556) internal successors, (520), 288 states have internal predecessors, (520), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:29,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 520 transitions. [2021-11-25 19:46:29,631 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 520 transitions. Word has length 143 [2021-11-25 19:46:29,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:46:29,632 INFO L470 AbstractCegarLoop]: Abstraction has 289 states and 520 transitions. [2021-11-25 19:46:29,633 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:29,633 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 520 transitions. [2021-11-25 19:46:29,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2021-11-25 19:46:29,637 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:46:29,637 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 19:46:29,638 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 19:46:29,638 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:46:29,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:46:29,639 INFO L85 PathProgramCache]: Analyzing trace with hash 1322634023, now seen corresponding path program 1 times [2021-11-25 19:46:29,639 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:46:29,640 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1306958448] [2021-11-25 19:46:29,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:46:29,640 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:46:29,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:46:29,755 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:46:29,755 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:46:29,756 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1306958448] [2021-11-25 19:46:29,756 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1306958448] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:46:29,756 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:46:29,756 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 19:46:29,757 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1406686568] [2021-11-25 19:46:29,757 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:46:29,758 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:46:29,759 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:46:29,759 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:46:29,759 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:46:29,760 INFO L87 Difference]: Start difference. First operand 289 states and 520 transitions. Second operand has 3 states, 3 states have (on average 49.333333333333336) internal successors, (148), 2 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:30,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:46:30,495 INFO L93 Difference]: Finished difference Result 863 states and 1557 transitions. [2021-11-25 19:46:30,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:46:30,496 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 49.333333333333336) internal successors, (148), 2 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 148 [2021-11-25 19:46:30,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:46:30,501 INFO L225 Difference]: With dead ends: 863 [2021-11-25 19:46:30,501 INFO L226 Difference]: Without dead ends: 575 [2021-11-25 19:46:30,503 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:46:30,505 INFO L933 BasicCegarLoop]: 65 mSDtfsCounter, 164 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 502 mSolverCounterSat, 92 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 164 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 594 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 92 IncrementalHoareTripleChecker+Valid, 502 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 19:46:30,505 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [164 Valid, 70 Invalid, 594 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [92 Valid, 502 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 19:46:30,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 575 states. [2021-11-25 19:46:30,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 575 to 575. [2021-11-25 19:46:30,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 575 states, 574 states have (on average 1.6724738675958188) internal successors, (960), 574 states have internal predecessors, (960), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:30,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 575 states to 575 states and 960 transitions. [2021-11-25 19:46:30,539 INFO L78 Accepts]: Start accepts. Automaton has 575 states and 960 transitions. Word has length 148 [2021-11-25 19:46:30,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:46:30,540 INFO L470 AbstractCegarLoop]: Abstraction has 575 states and 960 transitions. [2021-11-25 19:46:30,540 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 49.333333333333336) internal successors, (148), 2 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:30,540 INFO L276 IsEmpty]: Start isEmpty. Operand 575 states and 960 transitions. [2021-11-25 19:46:30,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2021-11-25 19:46:30,546 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:46:30,547 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 19:46:30,547 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 19:46:30,547 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:46:30,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:46:30,548 INFO L85 PathProgramCache]: Analyzing trace with hash 1094398428, now seen corresponding path program 1 times [2021-11-25 19:46:30,548 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:46:30,549 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2137004757] [2021-11-25 19:46:30,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:46:30,549 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:46:30,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:46:30,635 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:46:30,635 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:46:30,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2137004757] [2021-11-25 19:46:30,636 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2137004757] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:46:30,636 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:46:30,636 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 19:46:30,637 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [647031501] [2021-11-25 19:46:30,637 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:46:30,638 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:46:30,638 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:46:30,638 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:46:30,639 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:46:30,639 INFO L87 Difference]: Start difference. First operand 575 states and 960 transitions. Second operand has 3 states, 3 states have (on average 50.333333333333336) internal successors, (151), 2 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:31,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:46:31,362 INFO L93 Difference]: Finished difference Result 1721 states and 2877 transitions. [2021-11-25 19:46:31,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:46:31,363 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 50.333333333333336) internal successors, (151), 2 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 151 [2021-11-25 19:46:31,363 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:46:31,370 INFO L225 Difference]: With dead ends: 1721 [2021-11-25 19:46:31,370 INFO L226 Difference]: Without dead ends: 1147 [2021-11-25 19:46:31,373 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:46:31,374 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 157 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 450 mSolverCounterSat, 170 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 157 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 620 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 170 IncrementalHoareTripleChecker+Valid, 450 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 19:46:31,375 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [157 Valid, 27 Invalid, 620 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [170 Valid, 450 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 19:46:31,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1147 states. [2021-11-25 19:46:31,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1147 to 1147. [2021-11-25 19:46:31,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1147 states, 1146 states have (on average 1.62565445026178) internal successors, (1863), 1146 states have internal predecessors, (1863), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:31,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1147 states to 1147 states and 1863 transitions. [2021-11-25 19:46:31,413 INFO L78 Accepts]: Start accepts. Automaton has 1147 states and 1863 transitions. Word has length 151 [2021-11-25 19:46:31,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:46:31,413 INFO L470 AbstractCegarLoop]: Abstraction has 1147 states and 1863 transitions. [2021-11-25 19:46:31,413 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 50.333333333333336) internal successors, (151), 2 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:31,414 INFO L276 IsEmpty]: Start isEmpty. Operand 1147 states and 1863 transitions. [2021-11-25 19:46:31,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2021-11-25 19:46:31,417 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:46:31,417 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:46:31,418 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-25 19:46:31,418 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:46:31,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:46:31,419 INFO L85 PathProgramCache]: Analyzing trace with hash -1051089021, now seen corresponding path program 1 times [2021-11-25 19:46:31,419 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:46:31,419 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [561236311] [2021-11-25 19:46:31,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:46:31,420 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:46:31,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:46:31,523 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 28 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 19:46:31,523 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:46:31,523 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [561236311] [2021-11-25 19:46:31,524 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [561236311] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:46:31,524 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:46:31,524 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:46:31,524 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1653500194] [2021-11-25 19:46:31,524 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:46:31,525 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:46:31,525 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:46:31,526 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:46:31,526 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:46:31,526 INFO L87 Difference]: Start difference. First operand 1147 states and 1863 transitions. Second operand has 3 states, 3 states have (on average 52.666666666666664) internal successors, (158), 3 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:32,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:46:32,264 INFO L93 Difference]: Finished difference Result 3437 states and 5586 transitions. [2021-11-25 19:46:32,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:46:32,266 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 52.666666666666664) internal successors, (158), 3 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 163 [2021-11-25 19:46:32,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:46:32,279 INFO L225 Difference]: With dead ends: 3437 [2021-11-25 19:46:32,279 INFO L226 Difference]: Without dead ends: 2291 [2021-11-25 19:46:32,281 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:46:32,283 INFO L933 BasicCegarLoop]: 258 mSDtfsCounter, 152 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 410 mSolverCounterSat, 162 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 152 SdHoareTripleChecker+Valid, 262 SdHoareTripleChecker+Invalid, 572 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 162 IncrementalHoareTripleChecker+Valid, 410 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 19:46:32,283 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [152 Valid, 262 Invalid, 572 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [162 Valid, 410 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 19:46:32,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2291 states. [2021-11-25 19:46:32,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2291 to 2291. [2021-11-25 19:46:32,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2291 states, 2290 states have (on average 1.4017467248908297) internal successors, (3210), 2290 states have internal predecessors, (3210), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:32,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2291 states to 2291 states and 3210 transitions. [2021-11-25 19:46:32,345 INFO L78 Accepts]: Start accepts. Automaton has 2291 states and 3210 transitions. Word has length 163 [2021-11-25 19:46:32,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:46:32,346 INFO L470 AbstractCegarLoop]: Abstraction has 2291 states and 3210 transitions. [2021-11-25 19:46:32,346 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 52.666666666666664) internal successors, (158), 3 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:32,346 INFO L276 IsEmpty]: Start isEmpty. Operand 2291 states and 3210 transitions. [2021-11-25 19:46:32,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2021-11-25 19:46:32,352 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:46:32,352 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:46:32,352 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-25 19:46:32,353 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:46:32,353 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:46:32,353 INFO L85 PathProgramCache]: Analyzing trace with hash 102985989, now seen corresponding path program 1 times [2021-11-25 19:46:32,354 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:46:32,354 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1639257129] [2021-11-25 19:46:32,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:46:32,354 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:46:32,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:46:32,462 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 46 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 19:46:32,462 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:46:32,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1639257129] [2021-11-25 19:46:32,463 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1639257129] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:46:32,463 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:46:32,463 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:46:32,463 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1755757663] [2021-11-25 19:46:32,464 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:46:32,464 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:46:32,464 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:46:32,465 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:46:32,465 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:46:32,465 INFO L87 Difference]: Start difference. First operand 2291 states and 3210 transitions. Second operand has 3 states, 3 states have (on average 57.0) internal successors, (171), 3 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:33,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:46:33,211 INFO L93 Difference]: Finished difference Result 5725 states and 7992 transitions. [2021-11-25 19:46:33,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:46:33,211 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 57.0) internal successors, (171), 3 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 176 [2021-11-25 19:46:33,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:46:33,230 INFO L225 Difference]: With dead ends: 5725 [2021-11-25 19:46:33,230 INFO L226 Difference]: Without dead ends: 3435 [2021-11-25 19:46:33,233 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:46:33,234 INFO L933 BasicCegarLoop]: 264 mSDtfsCounter, 129 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 477 mSolverCounterSat, 108 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 129 SdHoareTripleChecker+Valid, 269 SdHoareTripleChecker+Invalid, 585 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 108 IncrementalHoareTripleChecker+Valid, 477 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 19:46:33,235 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [129 Valid, 269 Invalid, 585 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [108 Valid, 477 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 19:46:33,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3435 states. [2021-11-25 19:46:33,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3435 to 3435. [2021-11-25 19:46:33,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3435 states, 3434 states have (on average 1.3453698311007571) internal successors, (4620), 3434 states have internal predecessors, (4620), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:33,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3435 states to 3435 states and 4620 transitions. [2021-11-25 19:46:33,320 INFO L78 Accepts]: Start accepts. Automaton has 3435 states and 4620 transitions. Word has length 176 [2021-11-25 19:46:33,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:46:33,321 INFO L470 AbstractCegarLoop]: Abstraction has 3435 states and 4620 transitions. [2021-11-25 19:46:33,321 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 57.0) internal successors, (171), 3 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:33,321 INFO L276 IsEmpty]: Start isEmpty. Operand 3435 states and 4620 transitions. [2021-11-25 19:46:33,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2021-11-25 19:46:33,329 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:46:33,329 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 19:46:33,329 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-25 19:46:33,330 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:46:33,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:46:33,330 INFO L85 PathProgramCache]: Analyzing trace with hash 1441049025, now seen corresponding path program 1 times [2021-11-25 19:46:33,331 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:46:33,331 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [43340016] [2021-11-25 19:46:33,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:46:33,331 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:46:33,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:46:33,442 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 37 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:46:33,443 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:46:33,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [43340016] [2021-11-25 19:46:33,443 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [43340016] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:46:33,443 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1621942428] [2021-11-25 19:46:33,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:46:33,444 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:46:33,444 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:46:33,446 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:46:33,461 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 19:46:33,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:46:33,628 INFO L263 TraceCheckSpWp]: Trace formula consists of 450 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 19:46:33,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:46:34,114 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 37 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 19:46:34,115 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:46:34,115 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1621942428] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:46:34,115 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:46:34,115 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-25 19:46:34,116 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [83700828] [2021-11-25 19:46:34,116 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:46:34,116 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:46:34,117 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:46:34,117 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:46:34,117 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:46:34,118 INFO L87 Difference]: Start difference. First operand 3435 states and 4620 transitions. Second operand has 3 states, 3 states have (on average 58.666666666666664) internal successors, (176), 3 states have internal predecessors, (176), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:34,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:46:34,929 INFO L93 Difference]: Finished difference Result 10301 states and 13857 transitions. [2021-11-25 19:46:34,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:46:34,930 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 58.666666666666664) internal successors, (176), 3 states have internal predecessors, (176), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 181 [2021-11-25 19:46:34,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:46:34,969 INFO L225 Difference]: With dead ends: 10301 [2021-11-25 19:46:34,970 INFO L226 Difference]: Without dead ends: 6867 [2021-11-25 19:46:34,977 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 180 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:46:34,981 INFO L933 BasicCegarLoop]: 281 mSDtfsCounter, 5 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 437 mSolverCounterSat, 124 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 298 SdHoareTripleChecker+Invalid, 561 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 124 IncrementalHoareTripleChecker+Valid, 437 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 19:46:34,981 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 298 Invalid, 561 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [124 Valid, 437 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 19:46:34,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6867 states. [2021-11-25 19:46:35,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6867 to 6867. [2021-11-25 19:46:35,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6867 states, 6866 states have (on average 1.324206233614914) internal successors, (9092), 6866 states have internal predecessors, (9092), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:35,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6867 states to 6867 states and 9092 transitions. [2021-11-25 19:46:35,162 INFO L78 Accepts]: Start accepts. Automaton has 6867 states and 9092 transitions. Word has length 181 [2021-11-25 19:46:35,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:46:35,164 INFO L470 AbstractCegarLoop]: Abstraction has 6867 states and 9092 transitions. [2021-11-25 19:46:35,164 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 58.666666666666664) internal successors, (176), 3 states have internal predecessors, (176), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:35,164 INFO L276 IsEmpty]: Start isEmpty. Operand 6867 states and 9092 transitions. [2021-11-25 19:46:35,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2021-11-25 19:46:35,178 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:46:35,178 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 19:46:35,216 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 19:46:35,404 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-25 19:46:35,404 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:46:35,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:46:35,405 INFO L85 PathProgramCache]: Analyzing trace with hash -2067543450, now seen corresponding path program 1 times [2021-11-25 19:46:35,405 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:46:35,405 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1720923464] [2021-11-25 19:46:35,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:46:35,406 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:46:35,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:46:35,538 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 40 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:46:35,538 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:46:35,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1720923464] [2021-11-25 19:46:35,539 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1720923464] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:46:35,539 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:46:35,539 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 19:46:35,539 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1413230538] [2021-11-25 19:46:35,539 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:46:35,540 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:46:35,540 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:46:35,541 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:46:35,543 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:46:35,543 INFO L87 Difference]: Start difference. First operand 6867 states and 9092 transitions. Second operand has 3 states, 3 states have (on average 61.333333333333336) internal successors, (184), 2 states have internal predecessors, (184), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:36,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:46:36,386 INFO L93 Difference]: Finished difference Result 16021 states and 21314 transitions. [2021-11-25 19:46:36,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:46:36,386 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 61.333333333333336) internal successors, (184), 2 states have internal predecessors, (184), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 184 [2021-11-25 19:46:36,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:46:36,435 INFO L225 Difference]: With dead ends: 16021 [2021-11-25 19:46:36,435 INFO L226 Difference]: Without dead ends: 9155 [2021-11-25 19:46:36,443 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:46:36,444 INFO L933 BasicCegarLoop]: 81 mSDtfsCounter, 116 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 579 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 614 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 579 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 19:46:36,445 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [116 Valid, 86 Invalid, 614 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 579 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 19:46:36,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9155 states. [2021-11-25 19:46:36,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9155 to 9155. [2021-11-25 19:46:36,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9155 states, 9154 states have (on average 1.3209525890321172) internal successors, (12092), 9154 states have internal predecessors, (12092), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:36,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9155 states to 9155 states and 12092 transitions. [2021-11-25 19:46:36,685 INFO L78 Accepts]: Start accepts. Automaton has 9155 states and 12092 transitions. Word has length 184 [2021-11-25 19:46:36,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:46:36,686 INFO L470 AbstractCegarLoop]: Abstraction has 9155 states and 12092 transitions. [2021-11-25 19:46:36,686 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 61.333333333333336) internal successors, (184), 2 states have internal predecessors, (184), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:36,686 INFO L276 IsEmpty]: Start isEmpty. Operand 9155 states and 12092 transitions. [2021-11-25 19:46:36,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2021-11-25 19:46:36,703 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:46:36,703 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-25 19:46:36,704 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-25 19:46:36,704 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:46:36,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:46:36,704 INFO L85 PathProgramCache]: Analyzing trace with hash -1304618623, now seen corresponding path program 1 times [2021-11-25 19:46:36,705 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:46:36,705 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1022186091] [2021-11-25 19:46:36,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:46:36,705 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:46:36,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:46:36,865 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 47 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:46:36,866 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:46:36,866 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1022186091] [2021-11-25 19:46:36,866 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1022186091] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:46:36,866 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2055370457] [2021-11-25 19:46:36,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:46:36,868 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:46:36,871 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:46:36,872 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:46:36,894 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 19:46:37,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:46:37,042 INFO L263 TraceCheckSpWp]: Trace formula consists of 458 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 19:46:37,053 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:46:37,461 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 47 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 19:46:37,461 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:46:37,462 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2055370457] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:46:37,463 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:46:37,464 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-25 19:46:37,464 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1200511042] [2021-11-25 19:46:37,464 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:46:37,465 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:46:37,465 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:46:37,466 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:46:37,466 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:46:37,466 INFO L87 Difference]: Start difference. First operand 9155 states and 12092 transitions. Second operand has 3 states, 3 states have (on average 62.0) internal successors, (186), 3 states have internal predecessors, (186), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:38,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:46:38,226 INFO L93 Difference]: Finished difference Result 20740 states and 27888 transitions. [2021-11-25 19:46:38,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:46:38,227 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 62.0) internal successors, (186), 3 states have internal predecessors, (186), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 191 [2021-11-25 19:46:38,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:46:38,277 INFO L225 Difference]: With dead ends: 20740 [2021-11-25 19:46:38,277 INFO L226 Difference]: Without dead ends: 11872 [2021-11-25 19:46:38,290 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 190 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:46:38,290 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 47 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 490 mSolverCounterSat, 96 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 586 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 96 IncrementalHoareTripleChecker+Valid, 490 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 19:46:38,291 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [47 Valid, 24 Invalid, 586 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [96 Valid, 490 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 19:46:38,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11872 states. [2021-11-25 19:46:38,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11872 to 11872. [2021-11-25 19:46:38,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11872 states, 11871 states have (on average 1.3515289360626737) internal successors, (16044), 11871 states have internal predecessors, (16044), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:38,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11872 states to 11872 states and 16044 transitions. [2021-11-25 19:46:38,567 INFO L78 Accepts]: Start accepts. Automaton has 11872 states and 16044 transitions. Word has length 191 [2021-11-25 19:46:38,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:46:38,568 INFO L470 AbstractCegarLoop]: Abstraction has 11872 states and 16044 transitions. [2021-11-25 19:46:38,569 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 62.0) internal successors, (186), 3 states have internal predecessors, (186), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:38,569 INFO L276 IsEmpty]: Start isEmpty. Operand 11872 states and 16044 transitions. [2021-11-25 19:46:38,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 253 [2021-11-25 19:46:38,593 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:46:38,594 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-25 19:46:38,629 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 19:46:38,810 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:46:38,811 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:46:38,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:46:38,811 INFO L85 PathProgramCache]: Analyzing trace with hash -1816281591, now seen corresponding path program 1 times [2021-11-25 19:46:38,812 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:46:38,812 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2062216438] [2021-11-25 19:46:38,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:46:38,812 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:46:38,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:46:38,962 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 94 proven. 6 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2021-11-25 19:46:38,963 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:46:38,963 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2062216438] [2021-11-25 19:46:38,963 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2062216438] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:46:38,963 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [625564219] [2021-11-25 19:46:38,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:46:38,964 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:46:38,964 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:46:38,965 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:46:38,981 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 19:46:39,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:46:39,156 INFO L263 TraceCheckSpWp]: Trace formula consists of 560 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 19:46:39,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:46:39,525 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 155 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 19:46:39,526 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:46:39,526 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [625564219] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:46:39,526 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:46:39,526 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-25 19:46:39,527 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1494196530] [2021-11-25 19:46:39,527 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:46:39,528 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:46:39,528 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:46:39,528 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:46:39,528 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:46:39,529 INFO L87 Difference]: Start difference. First operand 11872 states and 16044 transitions. Second operand has 3 states, 3 states have (on average 82.33333333333333) internal successors, (247), 3 states have internal predecessors, (247), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:40,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:46:40,323 INFO L93 Difference]: Finished difference Result 27604 states and 37808 transitions. [2021-11-25 19:46:40,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:46:40,324 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 82.33333333333333) internal successors, (247), 3 states have internal predecessors, (247), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 252 [2021-11-25 19:46:40,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:46:40,358 INFO L225 Difference]: With dead ends: 27604 [2021-11-25 19:46:40,358 INFO L226 Difference]: Without dead ends: 15876 [2021-11-25 19:46:40,372 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 251 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:46:40,378 INFO L933 BasicCegarLoop]: 83 mSDtfsCounter, 99 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 398 mSolverCounterSat, 189 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 99 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 587 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 189 IncrementalHoareTripleChecker+Valid, 398 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 19:46:40,378 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [99 Valid, 87 Invalid, 587 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [189 Valid, 398 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 19:46:40,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15876 states. [2021-11-25 19:46:40,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15876 to 15876. [2021-11-25 19:46:40,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15876 states, 15875 states have (on average 1.2959370078740158) internal successors, (20573), 15875 states have internal predecessors, (20573), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:40,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15876 states to 15876 states and 20573 transitions. [2021-11-25 19:46:40,753 INFO L78 Accepts]: Start accepts. Automaton has 15876 states and 20573 transitions. Word has length 252 [2021-11-25 19:46:40,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:46:40,754 INFO L470 AbstractCegarLoop]: Abstraction has 15876 states and 20573 transitions. [2021-11-25 19:46:40,754 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 82.33333333333333) internal successors, (247), 3 states have internal predecessors, (247), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:40,754 INFO L276 IsEmpty]: Start isEmpty. Operand 15876 states and 20573 transitions. [2021-11-25 19:46:40,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 254 [2021-11-25 19:46:40,782 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:46:40,782 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-25 19:46:40,823 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 19:46:40,999 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:46:40,999 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:46:40,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:46:40,999 INFO L85 PathProgramCache]: Analyzing trace with hash -101137184, now seen corresponding path program 1 times [2021-11-25 19:46:41,000 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:46:41,000 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1143373978] [2021-11-25 19:46:41,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:46:41,000 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:46:41,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:46:41,117 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 113 proven. 0 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2021-11-25 19:46:41,118 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:46:41,118 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1143373978] [2021-11-25 19:46:41,118 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1143373978] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:46:41,118 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:46:41,118 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:46:41,119 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1242333577] [2021-11-25 19:46:41,119 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:46:41,119 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:46:41,120 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:46:41,120 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:46:41,120 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:46:41,120 INFO L87 Difference]: Start difference. First operand 15876 states and 20573 transitions. Second operand has 4 states, 4 states have (on average 48.25) internal successors, (193), 3 states have internal predecessors, (193), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:42,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:46:42,294 INFO L93 Difference]: Finished difference Result 33181 states and 43235 transitions. [2021-11-25 19:46:42,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:46:42,295 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 48.25) internal successors, (193), 3 states have internal predecessors, (193), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 253 [2021-11-25 19:46:42,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:46:42,326 INFO L225 Difference]: With dead ends: 33181 [2021-11-25 19:46:42,327 INFO L226 Difference]: Without dead ends: 17449 [2021-11-25 19:46:42,342 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:46:42,343 INFO L933 BasicCegarLoop]: 104 mSDtfsCounter, 245 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 1010 mSolverCounterSat, 173 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 245 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 1183 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 173 IncrementalHoareTripleChecker+Valid, 1010 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:46:42,344 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [245 Valid, 115 Invalid, 1183 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [173 Valid, 1010 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-25 19:46:42,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17449 states. [2021-11-25 19:46:42,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17449 to 15876. [2021-11-25 19:46:42,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15876 states, 15875 states have (on average 1.2959370078740158) internal successors, (20573), 15875 states have internal predecessors, (20573), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:42,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15876 states to 15876 states and 20573 transitions. [2021-11-25 19:46:42,694 INFO L78 Accepts]: Start accepts. Automaton has 15876 states and 20573 transitions. Word has length 253 [2021-11-25 19:46:42,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:46:42,696 INFO L470 AbstractCegarLoop]: Abstraction has 15876 states and 20573 transitions. [2021-11-25 19:46:42,696 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 48.25) internal successors, (193), 3 states have internal predecessors, (193), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:42,696 INFO L276 IsEmpty]: Start isEmpty. Operand 15876 states and 20573 transitions. [2021-11-25 19:46:42,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 261 [2021-11-25 19:46:42,729 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:46:42,729 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-25 19:46:42,729 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-25 19:46:42,730 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:46:42,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:46:42,730 INFO L85 PathProgramCache]: Analyzing trace with hash -711260507, now seen corresponding path program 1 times [2021-11-25 19:46:42,730 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:46:42,731 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1965448243] [2021-11-25 19:46:42,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:46:42,732 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:46:42,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:46:42,958 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 98 proven. 6 refuted. 0 times theorem prover too weak. 97 trivial. 0 not checked. [2021-11-25 19:46:42,958 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:46:42,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1965448243] [2021-11-25 19:46:42,959 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1965448243] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:46:42,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1725073689] [2021-11-25 19:46:42,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:46:42,959 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:46:42,960 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:46:42,967 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:46:42,989 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 19:46:43,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:46:43,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 596 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 19:46:43,148 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:46:43,488 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 110 proven. 0 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-25 19:46:43,488 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:46:43,489 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1725073689] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:46:43,489 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:46:43,489 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [3] total 4 [2021-11-25 19:46:43,489 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2085876423] [2021-11-25 19:46:43,489 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:46:43,490 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:46:43,490 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:46:43,491 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:46:43,491 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:46:43,491 INFO L87 Difference]: Start difference. First operand 15876 states and 20573 transitions. Second operand has 3 states, 3 states have (on average 59.333333333333336) internal successors, (178), 2 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:44,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:46:44,002 INFO L93 Difference]: Finished difference Result 29320 states and 38057 transitions. [2021-11-25 19:46:44,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:46:44,003 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 59.333333333333336) internal successors, (178), 2 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 260 [2021-11-25 19:46:44,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:46:44,029 INFO L225 Difference]: With dead ends: 29320 [2021-11-25 19:46:44,029 INFO L226 Difference]: Without dead ends: 13588 [2021-11-25 19:46:44,041 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 262 GetRequests, 259 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:46:44,041 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 227 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 264 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 227 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 287 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 264 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:46:44,042 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [227 Valid, 5 Invalid, 287 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 264 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 19:46:44,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13588 states. [2021-11-25 19:46:44,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13588 to 13588. [2021-11-25 19:46:44,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13588 states, 13587 states have (on average 1.2768087142121145) internal successors, (17348), 13587 states have internal predecessors, (17348), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:44,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13588 states to 13588 states and 17348 transitions. [2021-11-25 19:46:44,375 INFO L78 Accepts]: Start accepts. Automaton has 13588 states and 17348 transitions. Word has length 260 [2021-11-25 19:46:44,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:46:44,375 INFO L470 AbstractCegarLoop]: Abstraction has 13588 states and 17348 transitions. [2021-11-25 19:46:44,375 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 59.333333333333336) internal successors, (178), 2 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:44,376 INFO L276 IsEmpty]: Start isEmpty. Operand 13588 states and 17348 transitions. [2021-11-25 19:46:44,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 268 [2021-11-25 19:46:44,394 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:46:44,396 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:46:44,433 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 19:46:44,611 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:46:44,611 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:46:44,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:46:44,611 INFO L85 PathProgramCache]: Analyzing trace with hash -945825850, now seen corresponding path program 1 times [2021-11-25 19:46:44,611 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:46:44,612 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [850775892] [2021-11-25 19:46:44,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:46:44,612 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:46:44,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:46:44,791 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 123 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:46:44,791 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:46:44,792 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [850775892] [2021-11-25 19:46:44,792 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [850775892] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:46:44,792 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:46:44,792 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 19:46:44,794 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [707310314] [2021-11-25 19:46:44,794 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:46:44,795 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:46:44,795 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:46:44,796 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:46:44,796 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:46:44,796 INFO L87 Difference]: Start difference. First operand 13588 states and 17348 transitions. Second operand has 3 states, 3 states have (on average 89.0) internal successors, (267), 2 states have internal predecessors, (267), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:45,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:46:45,518 INFO L93 Difference]: Finished difference Result 30464 states and 38991 transitions. [2021-11-25 19:46:45,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:46:45,519 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 89.0) internal successors, (267), 2 states have internal predecessors, (267), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 267 [2021-11-25 19:46:45,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:46:45,541 INFO L225 Difference]: With dead ends: 30464 [2021-11-25 19:46:45,541 INFO L226 Difference]: Without dead ends: 17020 [2021-11-25 19:46:45,556 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:46:45,557 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 41 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 437 mSolverCounterSat, 129 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 566 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 129 IncrementalHoareTripleChecker+Valid, 437 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 19:46:45,557 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [41 Valid, 33 Invalid, 566 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [129 Valid, 437 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 19:46:45,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17020 states. [2021-11-25 19:46:45,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17020 to 16734. [2021-11-25 19:46:45,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16734 states, 16733 states have (on average 1.262236299527879) internal successors, (21121), 16733 states have internal predecessors, (21121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:45,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16734 states to 16734 states and 21121 transitions. [2021-11-25 19:46:45,820 INFO L78 Accepts]: Start accepts. Automaton has 16734 states and 21121 transitions. Word has length 267 [2021-11-25 19:46:45,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:46:45,820 INFO L470 AbstractCegarLoop]: Abstraction has 16734 states and 21121 transitions. [2021-11-25 19:46:45,821 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 89.0) internal successors, (267), 2 states have internal predecessors, (267), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:45,821 INFO L276 IsEmpty]: Start isEmpty. Operand 16734 states and 21121 transitions. [2021-11-25 19:46:45,842 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 275 [2021-11-25 19:46:45,842 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:46:45,842 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-25 19:46:45,842 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-25 19:46:45,843 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:46:45,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:46:45,843 INFO L85 PathProgramCache]: Analyzing trace with hash 2073369803, now seen corresponding path program 1 times [2021-11-25 19:46:45,843 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:46:45,843 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [845562522] [2021-11-25 19:46:45,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:46:45,844 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:46:45,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:46:46,240 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 130 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:46:46,240 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:46:46,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [845562522] [2021-11-25 19:46:46,240 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [845562522] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:46:46,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [58740227] [2021-11-25 19:46:46,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:46:46,240 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:46:46,241 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:46:46,241 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:46:46,242 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 19:46:46,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:46:46,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 522 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 19:46:46,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:46:48,031 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 130 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 19:46:48,031 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:46:48,031 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [58740227] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:46:48,031 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:46:48,032 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 6 [2021-11-25 19:46:48,032 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2143957640] [2021-11-25 19:46:48,032 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:46:48,033 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:46:48,033 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:46:48,033 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:46:48,033 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:46:48,034 INFO L87 Difference]: Start difference. First operand 16734 states and 21121 transitions. Second operand has 3 states, 3 states have (on average 89.66666666666667) internal successors, (269), 3 states have internal predecessors, (269), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:48,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:46:48,827 INFO L93 Difference]: Finished difference Result 37471 states and 47462 transitions. [2021-11-25 19:46:48,827 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:46:48,828 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 89.66666666666667) internal successors, (269), 3 states have internal predecessors, (269), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 274 [2021-11-25 19:46:48,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:46:48,849 INFO L225 Difference]: With dead ends: 37471 [2021-11-25 19:46:48,850 INFO L226 Difference]: Without dead ends: 20881 [2021-11-25 19:46:48,861 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 273 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:46:48,862 INFO L933 BasicCegarLoop]: 91 mSDtfsCounter, 8 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 507 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 578 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 507 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 19:46:48,862 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 96 Invalid, 578 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 507 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 19:46:48,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20881 states. [2021-11-25 19:46:49,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20881 to 20881. [2021-11-25 19:46:49,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20881 states, 20880 states have (on average 1.2365900383141764) internal successors, (25820), 20880 states have internal predecessors, (25820), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:49,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20881 states to 20881 states and 25820 transitions. [2021-11-25 19:46:49,275 INFO L78 Accepts]: Start accepts. Automaton has 20881 states and 25820 transitions. Word has length 274 [2021-11-25 19:46:49,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:46:49,276 INFO L470 AbstractCegarLoop]: Abstraction has 20881 states and 25820 transitions. [2021-11-25 19:46:49,276 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 89.66666666666667) internal successors, (269), 3 states have internal predecessors, (269), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:49,276 INFO L276 IsEmpty]: Start isEmpty. Operand 20881 states and 25820 transitions. [2021-11-25 19:46:49,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 280 [2021-11-25 19:46:49,303 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:46:49,304 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-25 19:46:49,339 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 19:46:49,529 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-25 19:46:49,530 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:46:49,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:46:49,531 INFO L85 PathProgramCache]: Analyzing trace with hash 489621198, now seen corresponding path program 1 times [2021-11-25 19:46:49,531 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:46:49,531 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [588868197] [2021-11-25 19:46:49,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:46:49,531 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:46:49,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:46:49,774 INFO L134 CoverageAnalysis]: Checked inductivity of 195 backedges. 134 proven. 0 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2021-11-25 19:46:49,774 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:46:49,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [588868197] [2021-11-25 19:46:49,774 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [588868197] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:46:49,774 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:46:49,775 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 19:46:49,775 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [818182558] [2021-11-25 19:46:49,775 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:46:49,776 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:46:49,776 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:46:49,777 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:46:49,777 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:46:49,777 INFO L87 Difference]: Start difference. First operand 20881 states and 25820 transitions. Second operand has 3 states, 3 states have (on average 73.0) internal successors, (219), 2 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:50,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:46:50,698 INFO L93 Difference]: Finished difference Result 46480 states and 57442 transitions. [2021-11-25 19:46:50,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:46:50,700 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 73.0) internal successors, (219), 2 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 279 [2021-11-25 19:46:50,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:46:50,745 INFO L225 Difference]: With dead ends: 46480 [2021-11-25 19:46:50,753 INFO L226 Difference]: Without dead ends: 25743 [2021-11-25 19:46:50,768 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:46:50,768 INFO L933 BasicCegarLoop]: 66 mSDtfsCounter, 84 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 518 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 528 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 518 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 19:46:50,769 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [84 Valid, 79 Invalid, 528 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 518 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 19:46:50,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25743 states. [2021-11-25 19:46:51,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25743 to 24742. [2021-11-25 19:46:51,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24742 states, 24741 states have (on average 1.2400468857362272) internal successors, (30680), 24741 states have internal predecessors, (30680), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:51,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24742 states to 24742 states and 30680 transitions. [2021-11-25 19:46:51,294 INFO L78 Accepts]: Start accepts. Automaton has 24742 states and 30680 transitions. Word has length 279 [2021-11-25 19:46:51,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:46:51,295 INFO L470 AbstractCegarLoop]: Abstraction has 24742 states and 30680 transitions. [2021-11-25 19:46:51,295 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 73.0) internal successors, (219), 2 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:51,295 INFO L276 IsEmpty]: Start isEmpty. Operand 24742 states and 30680 transitions. [2021-11-25 19:46:51,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 301 [2021-11-25 19:46:51,359 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:46:51,360 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-25 19:46:51,360 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-25 19:46:51,360 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:46:51,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:46:51,361 INFO L85 PathProgramCache]: Analyzing trace with hash -1144939048, now seen corresponding path program 1 times [2021-11-25 19:46:51,361 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:46:51,361 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [451500989] [2021-11-25 19:46:51,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:46:51,362 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:46:51,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:46:51,565 INFO L134 CoverageAnalysis]: Checked inductivity of 216 backedges. 216 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:46:51,565 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:46:51,566 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [451500989] [2021-11-25 19:46:51,566 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [451500989] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:46:51,566 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:46:51,566 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:46:51,566 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1119106041] [2021-11-25 19:46:51,567 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:46:51,567 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:46:51,568 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:46:51,568 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:46:51,568 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:46:51,568 INFO L87 Difference]: Start difference. First operand 24742 states and 30680 transitions. Second operand has 3 states, 3 states have (on average 100.0) internal successors, (300), 3 states have internal predecessors, (300), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:52,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:46:52,402 INFO L93 Difference]: Finished difference Result 54345 states and 67522 transitions. [2021-11-25 19:46:52,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:46:52,403 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 100.0) internal successors, (300), 3 states have internal predecessors, (300), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 300 [2021-11-25 19:46:52,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:46:52,432 INFO L225 Difference]: With dead ends: 54345 [2021-11-25 19:46:52,432 INFO L226 Difference]: Without dead ends: 29747 [2021-11-25 19:46:52,449 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:46:52,450 INFO L933 BasicCegarLoop]: 230 mSDtfsCounter, 111 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 404 mSolverCounterSat, 138 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 111 SdHoareTripleChecker+Valid, 234 SdHoareTripleChecker+Invalid, 542 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 138 IncrementalHoareTripleChecker+Valid, 404 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 19:46:52,450 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [111 Valid, 234 Invalid, 542 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [138 Valid, 404 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 19:46:52,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29747 states. [2021-11-25 19:46:52,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29747 to 26744. [2021-11-25 19:46:52,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26744 states, 26743 states have (on average 1.1999775642224133) internal successors, (32091), 26743 states have internal predecessors, (32091), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:52,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26744 states to 26744 states and 32091 transitions. [2021-11-25 19:46:52,936 INFO L78 Accepts]: Start accepts. Automaton has 26744 states and 32091 transitions. Word has length 300 [2021-11-25 19:46:52,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:46:52,936 INFO L470 AbstractCegarLoop]: Abstraction has 26744 states and 32091 transitions. [2021-11-25 19:46:52,936 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 100.0) internal successors, (300), 3 states have internal predecessors, (300), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:46:52,936 INFO L276 IsEmpty]: Start isEmpty. Operand 26744 states and 32091 transitions. [2021-11-25 19:46:52,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 333 [2021-11-25 19:46:52,960 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:46:52,961 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-25 19:46:52,961 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-25 19:46:52,961 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:46:52,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:46:52,962 INFO L85 PathProgramCache]: Analyzing trace with hash 131618665, now seen corresponding path program 1 times [2021-11-25 19:46:52,962 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:46:52,962 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [683897209] [2021-11-25 19:46:52,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:46:52,963 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:46:53,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:46:53,351 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 188 proven. 73 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 19:46:53,352 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:46:53,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [683897209] [2021-11-25 19:46:53,352 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [683897209] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:46:53,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1706422593] [2021-11-25 19:46:53,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:46:53,353 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:46:53,353 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:46:53,354 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:46:53,379 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 19:46:53,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:46:53,578 INFO L263 TraceCheckSpWp]: Trace formula consists of 632 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 19:46:53,586 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:46:54,174 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 188 proven. 67 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 19:46:54,174 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:46:54,787 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 188 proven. 67 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 19:46:54,787 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1706422593] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:46:54,787 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [750233203] [2021-11-25 19:46:54,814 INFO L159 IcfgInterpreter]: Started Sifa with 145 locations of interest [2021-11-25 19:46:54,814 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:46:54,818 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:46:54,823 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:46:54,823 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:53:49,049 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 62 [2021-11-25 19:53:50,041 WARN L176 XnfTransformerHelper]: Simplifying disjunction of 52752 conjuctions. This might take some time... [2021-11-25 19:53:53,470 INFO L192 XnfTransformerHelper]: Simplified to disjunction of 272 conjuctions. [2021-11-25 19:53:53,483 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 62 [2021-11-25 19:53:54,257 WARN L176 XnfTransformerHelper]: Simplifying disjunction of 52752 conjuctions. This might take some time... [2021-11-25 19:53:57,403 INFO L192 XnfTransformerHelper]: Simplified to disjunction of 272 conjuctions. [2021-11-25 19:53:57,967 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 62 [2021-11-25 19:53:58,827 WARN L176 XnfTransformerHelper]: Simplifying disjunction of 52752 conjuctions. This might take some time... [2021-11-25 19:54:01,954 INFO L192 XnfTransformerHelper]: Simplified to disjunction of 272 conjuctions. [2021-11-25 19:54:33,628 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:54:58,955 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [750233203] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:54:58,955 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:54:58,955 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [4, 3, 3] total 12 [2021-11-25 19:54:58,956 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [964048593] [2021-11-25 19:54:58,956 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:54:58,957 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 19:54:58,957 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:54:58,957 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 19:54:58,957 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2021-11-25 19:54:58,958 INFO L87 Difference]: Start difference. First operand 26744 states and 32091 transitions. Second operand has 7 states, 7 states have (on average 21.0) internal successors, (147), 6 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:03,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:55:03,229 INFO L93 Difference]: Finished difference Result 56801 states and 68489 transitions. [2021-11-25 19:55:03,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 19:55:03,230 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 21.0) internal successors, (147), 6 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 332 [2021-11-25 19:55:03,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:55:03,255 INFO L225 Difference]: With dead ends: 56801 [2021-11-25 19:55:03,255 INFO L226 Difference]: Without dead ends: 30201 [2021-11-25 19:55:03,274 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1001 GetRequests, 687 SyntacticMatches, 300 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2134 ImplicationChecksByTransitivity, 27.2s TimeCoverageRelationStatistics Valid=66, Invalid=174, Unknown=0, NotChecked=0, Total=240 [2021-11-25 19:55:03,275 INFO L933 BasicCegarLoop]: 82 mSDtfsCounter, 420 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 1247 mSolverCounterSat, 120 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 420 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 1367 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 120 IncrementalHoareTripleChecker+Valid, 1247 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:55:03,275 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [420 Valid, 90 Invalid, 1367 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [120 Valid, 1247 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2021-11-25 19:55:03,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30201 states. [2021-11-25 19:55:03,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30201 to 29791. [2021-11-25 19:55:03,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29791 states, 29790 states have (on average 1.202954011413226) internal successors, (35836), 29790 states have internal predecessors, (35836), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:03,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29791 states to 29791 states and 35836 transitions. [2021-11-25 19:55:03,729 INFO L78 Accepts]: Start accepts. Automaton has 29791 states and 35836 transitions. Word has length 332 [2021-11-25 19:55:03,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:55:03,730 INFO L470 AbstractCegarLoop]: Abstraction has 29791 states and 35836 transitions. [2021-11-25 19:55:03,730 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 21.0) internal successors, (147), 6 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:03,730 INFO L276 IsEmpty]: Start isEmpty. Operand 29791 states and 35836 transitions. [2021-11-25 19:55:03,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 336 [2021-11-25 19:55:03,751 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:55:03,752 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-25 19:55:03,775 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2021-11-25 19:55:03,953 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-25 19:55:03,954 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:55:03,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:55:03,955 INFO L85 PathProgramCache]: Analyzing trace with hash 1589698303, now seen corresponding path program 1 times [2021-11-25 19:55:03,955 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:55:03,955 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [926473758] [2021-11-25 19:55:03,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:55:03,955 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:55:04,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:55:04,279 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 197 proven. 6 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2021-11-25 19:55:04,279 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:55:04,279 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [926473758] [2021-11-25 19:55:04,280 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [926473758] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:55:04,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1711417222] [2021-11-25 19:55:04,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:55:04,280 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:55:04,280 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:55:04,283 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:55:04,305 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 19:55:04,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:55:04,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 624 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 19:55:04,512 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:55:05,170 INFO L134 CoverageAnalysis]: Checked inductivity of 264 backedges. 258 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-25 19:55:05,170 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:55:05,170 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1711417222] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:55:05,170 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:55:05,171 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 6 [2021-11-25 19:55:05,172 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1685540614] [2021-11-25 19:55:05,172 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:55:05,173 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:55:05,173 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:55:05,174 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:55:05,174 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:55:05,174 INFO L87 Difference]: Start difference. First operand 29791 states and 35836 transitions. Second operand has 3 states, 3 states have (on average 110.0) internal successors, (330), 3 states have internal predecessors, (330), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:05,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:55:05,853 INFO L93 Difference]: Finished difference Result 63255 states and 75900 transitions. [2021-11-25 19:55:05,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:55:05,853 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 110.0) internal successors, (330), 3 states have internal predecessors, (330), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 335 [2021-11-25 19:55:05,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:55:05,882 INFO L225 Difference]: With dead ends: 63255 [2021-11-25 19:55:05,883 INFO L226 Difference]: Without dead ends: 36655 [2021-11-25 19:55:05,900 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 334 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:55:05,900 INFO L933 BasicCegarLoop]: 224 mSDtfsCounter, 121 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 447 mSolverCounterSat, 106 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 121 SdHoareTripleChecker+Valid, 228 SdHoareTripleChecker+Invalid, 553 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 106 IncrementalHoareTripleChecker+Valid, 447 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:55:05,901 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [121 Valid, 228 Invalid, 553 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [106 Valid, 447 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 19:55:05,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36655 states. [2021-11-25 19:55:06,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36655 to 36655. [2021-11-25 19:55:06,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36655 states, 36654 states have (on average 1.1953129262836253) internal successors, (43813), 36654 states have internal predecessors, (43813), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:06,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36655 states to 36655 states and 43813 transitions. [2021-11-25 19:55:06,312 INFO L78 Accepts]: Start accepts. Automaton has 36655 states and 43813 transitions. Word has length 335 [2021-11-25 19:55:06,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:55:06,312 INFO L470 AbstractCegarLoop]: Abstraction has 36655 states and 43813 transitions. [2021-11-25 19:55:06,313 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 110.0) internal successors, (330), 3 states have internal predecessors, (330), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:06,313 INFO L276 IsEmpty]: Start isEmpty. Operand 36655 states and 43813 transitions. [2021-11-25 19:55:06,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 354 [2021-11-25 19:55:06,339 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:55:06,339 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:55:06,360 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 19:55:06,540 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-25 19:55:06,540 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:55:06,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:55:06,541 INFO L85 PathProgramCache]: Analyzing trace with hash -2032795178, now seen corresponding path program 1 times [2021-11-25 19:55:06,541 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:55:06,541 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [220451437] [2021-11-25 19:55:06,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:55:06,541 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:55:06,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:55:06,775 INFO L134 CoverageAnalysis]: Checked inductivity of 304 backedges. 223 proven. 12 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2021-11-25 19:55:06,775 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:55:06,775 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [220451437] [2021-11-25 19:55:06,775 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [220451437] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:55:06,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [610725188] [2021-11-25 19:55:06,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:55:06,776 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:55:06,776 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:55:06,777 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:55:06,797 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 19:55:06,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:55:06,999 INFO L263 TraceCheckSpWp]: Trace formula consists of 700 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 19:55:07,004 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:55:08,093 INFO L134 CoverageAnalysis]: Checked inductivity of 304 backedges. 235 proven. 0 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2021-11-25 19:55:08,093 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:55:08,094 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [610725188] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:55:08,094 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:55:08,094 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 4 [2021-11-25 19:55:08,094 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1850628508] [2021-11-25 19:55:08,095 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:55:08,095 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:55:08,095 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:55:08,096 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:55:08,096 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:55:08,096 INFO L87 Difference]: Start difference. First operand 36655 states and 43813 transitions. Second operand has 4 states, 4 states have (on average 71.5) internal successors, (286), 3 states have internal predecessors, (286), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:08,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:55:08,947 INFO L93 Difference]: Finished difference Result 100008 states and 119082 transitions. [2021-11-25 19:55:08,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:55:08,948 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 71.5) internal successors, (286), 3 states have internal predecessors, (286), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 353 [2021-11-25 19:55:08,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:55:09,005 INFO L225 Difference]: With dead ends: 100008 [2021-11-25 19:55:09,005 INFO L226 Difference]: Without dead ends: 66544 [2021-11-25 19:55:09,026 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 355 GetRequests, 352 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:55:09,027 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 564 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 513 mSolverCounterSat, 103 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 564 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 616 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 103 IncrementalHoareTripleChecker+Valid, 513 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:55:09,027 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [564 Valid, 10 Invalid, 616 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [103 Valid, 513 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 19:55:09,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66544 states. [2021-11-25 19:55:09,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66544 to 65107. [2021-11-25 19:55:09,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65107 states, 65106 states have (on average 1.1898903326882315) internal successors, (77469), 65106 states have internal predecessors, (77469), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:10,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65107 states to 65107 states and 77469 transitions. [2021-11-25 19:55:10,061 INFO L78 Accepts]: Start accepts. Automaton has 65107 states and 77469 transitions. Word has length 353 [2021-11-25 19:55:10,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:55:10,061 INFO L470 AbstractCegarLoop]: Abstraction has 65107 states and 77469 transitions. [2021-11-25 19:55:10,062 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 71.5) internal successors, (286), 3 states have internal predecessors, (286), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:10,062 INFO L276 IsEmpty]: Start isEmpty. Operand 65107 states and 77469 transitions. [2021-11-25 19:55:10,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 355 [2021-11-25 19:55:10,094 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:55:10,094 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-25 19:55:10,118 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 19:55:10,296 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-25 19:55:10,296 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:55:10,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:55:10,296 INFO L85 PathProgramCache]: Analyzing trace with hash 1367953479, now seen corresponding path program 1 times [2021-11-25 19:55:10,297 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:55:10,297 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1137704425] [2021-11-25 19:55:10,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:55:10,297 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:55:10,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:55:10,446 INFO L134 CoverageAnalysis]: Checked inductivity of 387 backedges. 222 proven. 6 refuted. 0 times theorem prover too weak. 159 trivial. 0 not checked. [2021-11-25 19:55:10,446 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:55:10,447 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1137704425] [2021-11-25 19:55:10,447 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1137704425] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:55:10,447 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1914898014] [2021-11-25 19:55:10,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:55:10,447 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:55:10,448 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:55:10,448 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:55:10,459 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 19:55:10,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:55:10,662 INFO L263 TraceCheckSpWp]: Trace formula consists of 690 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 19:55:10,666 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:55:11,112 INFO L134 CoverageAnalysis]: Checked inductivity of 387 backedges. 332 proven. 0 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-25 19:55:11,112 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:55:11,113 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1914898014] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:55:11,113 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:55:11,113 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-25 19:55:11,113 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1093678331] [2021-11-25 19:55:11,113 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:55:11,114 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:55:11,114 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:55:11,114 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:55:11,114 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:55:11,114 INFO L87 Difference]: Start difference. First operand 65107 states and 77469 transitions. Second operand has 3 states, 3 states have (on average 100.33333333333333) internal successors, (301), 3 states have internal predecessors, (301), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:12,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:55:12,002 INFO L93 Difference]: Finished difference Result 159043 states and 190379 transitions. [2021-11-25 19:55:12,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:55:12,002 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 100.33333333333333) internal successors, (301), 3 states have internal predecessors, (301), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 354 [2021-11-25 19:55:12,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:55:12,089 INFO L225 Difference]: With dead ends: 159043 [2021-11-25 19:55:12,089 INFO L226 Difference]: Without dead ends: 94758 [2021-11-25 19:55:12,121 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 356 GetRequests, 353 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-25 19:55:12,122 INFO L933 BasicCegarLoop]: 74 mSDtfsCounter, 114 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 475 mSolverCounterSat, 66 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 541 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 475 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:55:12,122 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [114 Valid, 79 Invalid, 541 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 475 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 19:55:12,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94758 states. [2021-11-25 19:55:13,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94758 to 92108. [2021-11-25 19:55:13,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92108 states, 92107 states have (on average 1.1789874819503403) internal successors, (108593), 92107 states have internal predecessors, (108593), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:13,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92108 states to 92108 states and 108593 transitions. [2021-11-25 19:55:13,202 INFO L78 Accepts]: Start accepts. Automaton has 92108 states and 108593 transitions. Word has length 354 [2021-11-25 19:55:13,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:55:13,202 INFO L470 AbstractCegarLoop]: Abstraction has 92108 states and 108593 transitions. [2021-11-25 19:55:13,203 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 100.33333333333333) internal successors, (301), 3 states have internal predecessors, (301), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:13,203 INFO L276 IsEmpty]: Start isEmpty. Operand 92108 states and 108593 transitions. [2021-11-25 19:55:13,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 377 [2021-11-25 19:55:13,258 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:55:13,258 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-25 19:55:13,282 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-25 19:55:13,458 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:55:13,459 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:55:13,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:55:13,459 INFO L85 PathProgramCache]: Analyzing trace with hash 834430758, now seen corresponding path program 1 times [2021-11-25 19:55:13,459 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:55:13,459 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1361161270] [2021-11-25 19:55:13,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:55:13,459 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:55:13,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:55:13,608 INFO L134 CoverageAnalysis]: Checked inductivity of 469 backedges. 310 proven. 0 refuted. 0 times theorem prover too weak. 159 trivial. 0 not checked. [2021-11-25 19:55:13,608 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:55:13,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1361161270] [2021-11-25 19:55:13,609 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1361161270] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:55:13,609 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:55:13,609 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:55:13,609 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [637397176] [2021-11-25 19:55:13,609 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:55:13,610 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:55:13,610 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:55:13,610 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:55:13,611 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:55:13,611 INFO L87 Difference]: Start difference. First operand 92108 states and 108593 transitions. Second operand has 3 states, 3 states have (on average 89.33333333333333) internal successors, (268), 3 states have internal predecessors, (268), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:15,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:55:15,721 INFO L93 Difference]: Finished difference Result 184059 states and 216463 transitions. [2021-11-25 19:55:15,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:55:15,722 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 89.33333333333333) internal successors, (268), 3 states have internal predecessors, (268), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 376 [2021-11-25 19:55:15,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:55:15,813 INFO L225 Difference]: With dead ends: 184059 [2021-11-25 19:55:15,813 INFO L226 Difference]: Without dead ends: 95826 [2021-11-25 19:55:15,941 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:55:15,943 INFO L933 BasicCegarLoop]: 228 mSDtfsCounter, 135 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 422 mSolverCounterSat, 121 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 135 SdHoareTripleChecker+Valid, 232 SdHoareTripleChecker+Invalid, 543 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 121 IncrementalHoareTripleChecker+Valid, 422 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:55:15,944 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [135 Valid, 232 Invalid, 543 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [121 Valid, 422 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 19:55:16,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95826 states. [2021-11-25 19:55:17,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95826 to 92108. [2021-11-25 19:55:17,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92108 states, 92107 states have (on average 1.1500537418437253) internal successors, (105928), 92107 states have internal predecessors, (105928), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:17,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92108 states to 92108 states and 105928 transitions. [2021-11-25 19:55:17,594 INFO L78 Accepts]: Start accepts. Automaton has 92108 states and 105928 transitions. Word has length 376 [2021-11-25 19:55:17,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:55:17,594 INFO L470 AbstractCegarLoop]: Abstraction has 92108 states and 105928 transitions. [2021-11-25 19:55:17,595 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 89.33333333333333) internal successors, (268), 3 states have internal predecessors, (268), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:17,595 INFO L276 IsEmpty]: Start isEmpty. Operand 92108 states and 105928 transitions. [2021-11-25 19:55:17,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 397 [2021-11-25 19:55:17,717 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:55:17,718 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-25 19:55:17,718 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-11-25 19:55:17,718 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:55:17,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:55:17,719 INFO L85 PathProgramCache]: Analyzing trace with hash -324741067, now seen corresponding path program 1 times [2021-11-25 19:55:17,719 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:55:17,719 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [168336793] [2021-11-25 19:55:17,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:55:17,720 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:55:17,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:55:17,984 INFO L134 CoverageAnalysis]: Checked inductivity of 474 backedges. 401 proven. 0 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2021-11-25 19:55:17,985 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:55:17,985 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [168336793] [2021-11-25 19:55:17,985 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [168336793] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:55:17,985 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:55:17,985 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:55:17,986 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [444717654] [2021-11-25 19:55:17,986 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:55:17,987 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:55:17,987 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:55:17,987 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:55:17,987 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:55:17,988 INFO L87 Difference]: Start difference. First operand 92108 states and 105928 transitions. Second operand has 3 states, 3 states have (on average 110.66666666666667) internal successors, (332), 3 states have internal predecessors, (332), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:19,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:55:19,286 INFO L93 Difference]: Finished difference Result 187098 states and 215395 transitions. [2021-11-25 19:55:19,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:55:19,287 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 110.66666666666667) internal successors, (332), 3 states have internal predecessors, (332), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 396 [2021-11-25 19:55:19,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:55:19,372 INFO L225 Difference]: With dead ends: 187098 [2021-11-25 19:55:19,372 INFO L226 Difference]: Without dead ends: 95669 [2021-11-25 19:55:19,400 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:55:19,401 INFO L933 BasicCegarLoop]: 76 mSDtfsCounter, 106 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 452 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 539 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 452 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-25 19:55:19,402 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [106 Valid, 81 Invalid, 539 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 452 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-25 19:55:19,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95669 states. [2021-11-25 19:55:20,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95669 to 67448. [2021-11-25 19:55:20,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67448 states, 67447 states have (on average 1.1388497635180215) internal successors, (76812), 67447 states have internal predecessors, (76812), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:20,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67448 states to 67448 states and 76812 transitions. [2021-11-25 19:55:20,977 INFO L78 Accepts]: Start accepts. Automaton has 67448 states and 76812 transitions. Word has length 396 [2021-11-25 19:55:20,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:55:20,978 INFO L470 AbstractCegarLoop]: Abstraction has 67448 states and 76812 transitions. [2021-11-25 19:55:20,978 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 110.66666666666667) internal successors, (332), 3 states have internal predecessors, (332), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:20,978 INFO L276 IsEmpty]: Start isEmpty. Operand 67448 states and 76812 transitions. [2021-11-25 19:55:21,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 409 [2021-11-25 19:55:21,024 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:55:21,025 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-25 19:55:21,025 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-11-25 19:55:21,025 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:55:21,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:55:21,025 INFO L85 PathProgramCache]: Analyzing trace with hash 187909943, now seen corresponding path program 1 times [2021-11-25 19:55:21,026 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:55:21,026 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [179373352] [2021-11-25 19:55:21,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:55:21,026 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:55:21,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:55:21,230 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 422 proven. 18 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2021-11-25 19:55:21,230 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:55:21,231 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [179373352] [2021-11-25 19:55:21,231 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [179373352] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:55:21,231 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1978471064] [2021-11-25 19:55:21,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:55:21,231 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:55:21,232 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:55:21,232 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:55:21,253 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 19:55:21,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:55:21,464 INFO L263 TraceCheckSpWp]: Trace formula consists of 786 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 19:55:21,477 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:55:22,188 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 461 proven. 0 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2021-11-25 19:55:22,188 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:55:22,188 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1978471064] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:55:22,188 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:55:22,188 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2021-11-25 19:55:22,188 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482131195] [2021-11-25 19:55:22,188 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:55:22,189 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:55:22,189 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:55:22,189 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:55:22,189 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:55:22,189 INFO L87 Difference]: Start difference. First operand 67448 states and 76812 transitions. Second operand has 4 states, 4 states have (on average 85.75) internal successors, (343), 4 states have internal predecessors, (343), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:23,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:55:23,481 INFO L93 Difference]: Finished difference Result 143699 states and 162975 transitions. [2021-11-25 19:55:23,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:55:23,484 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 85.75) internal successors, (343), 4 states have internal predecessors, (343), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 408 [2021-11-25 19:55:23,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:55:23,553 INFO L225 Difference]: With dead ends: 143699 [2021-11-25 19:55:23,553 INFO L226 Difference]: Without dead ends: 76930 [2021-11-25 19:55:23,582 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 411 GetRequests, 407 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:55:23,583 INFO L933 BasicCegarLoop]: 193 mSDtfsCounter, 260 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 879 mSolverCounterSat, 203 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 260 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 1082 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 203 IncrementalHoareTripleChecker+Valid, 879 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 19:55:23,583 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [260 Valid, 202 Invalid, 1082 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [203 Valid, 879 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 19:55:23,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76930 states. [2021-11-25 19:55:24,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76930 to 74192. [2021-11-25 19:55:24,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74192 states, 74191 states have (on average 1.128303972179914) internal successors, (83710), 74191 states have internal predecessors, (83710), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:24,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74192 states to 74192 states and 83710 transitions. [2021-11-25 19:55:24,884 INFO L78 Accepts]: Start accepts. Automaton has 74192 states and 83710 transitions. Word has length 408 [2021-11-25 19:55:24,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:55:24,885 INFO L470 AbstractCegarLoop]: Abstraction has 74192 states and 83710 transitions. [2021-11-25 19:55:24,885 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 85.75) internal successors, (343), 4 states have internal predecessors, (343), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:24,885 INFO L276 IsEmpty]: Start isEmpty. Operand 74192 states and 83710 transitions. [2021-11-25 19:55:24,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 412 [2021-11-25 19:55:24,948 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:55:24,948 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-25 19:55:24,971 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 19:55:25,148 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:55:25,149 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:55:25,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:55:25,149 INFO L85 PathProgramCache]: Analyzing trace with hash 1494115597, now seen corresponding path program 1 times [2021-11-25 19:55:25,149 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:55:25,150 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [43914442] [2021-11-25 19:55:25,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:55:25,150 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:55:25,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:55:25,369 INFO L134 CoverageAnalysis]: Checked inductivity of 540 backedges. 339 proven. 36 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2021-11-25 19:55:25,369 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:55:25,369 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [43914442] [2021-11-25 19:55:25,369 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [43914442] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:55:25,369 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1433303034] [2021-11-25 19:55:25,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:55:25,370 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:55:25,370 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:55:25,392 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:55:25,410 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-25 19:55:25,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:55:25,655 INFO L263 TraceCheckSpWp]: Trace formula consists of 773 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 19:55:25,663 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:55:26,452 INFO L134 CoverageAnalysis]: Checked inductivity of 540 backedges. 479 proven. 0 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2021-11-25 19:55:26,452 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:55:26,453 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1433303034] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:55:26,453 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:55:26,453 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [3] total 7 [2021-11-25 19:55:26,453 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1159955470] [2021-11-25 19:55:26,454 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:55:26,454 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 19:55:26,455 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:55:26,455 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 19:55:26,455 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-25 19:55:26,455 INFO L87 Difference]: Start difference. First operand 74192 states and 83710 transitions. Second operand has 5 states, 5 states have (on average 70.2) internal successors, (351), 5 states have internal predecessors, (351), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:28,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:55:28,281 INFO L93 Difference]: Finished difference Result 222916 states and 250853 transitions. [2021-11-25 19:55:28,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-25 19:55:28,281 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 70.2) internal successors, (351), 5 states have internal predecessors, (351), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 411 [2021-11-25 19:55:28,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:55:28,743 INFO L225 Difference]: With dead ends: 222916 [2021-11-25 19:55:28,743 INFO L226 Difference]: Without dead ends: 151271 [2021-11-25 19:55:28,774 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 413 GetRequests, 408 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-25 19:55:28,775 INFO L933 BasicCegarLoop]: 156 mSDtfsCounter, 339 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 1072 mSolverCounterSat, 146 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 339 SdHoareTripleChecker+Valid, 345 SdHoareTripleChecker+Invalid, 1218 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 146 IncrementalHoareTripleChecker+Valid, 1072 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:55:28,775 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [339 Valid, 345 Invalid, 1218 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [146 Valid, 1072 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2021-11-25 19:55:28,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151271 states. [2021-11-25 19:55:30,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151271 to 139829. [2021-11-25 19:55:30,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 139829 states, 139828 states have (on average 1.123079783734302) internal successors, (157038), 139828 states have internal predecessors, (157038), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:30,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139829 states to 139829 states and 157038 transitions. [2021-11-25 19:55:30,979 INFO L78 Accepts]: Start accepts. Automaton has 139829 states and 157038 transitions. Word has length 411 [2021-11-25 19:55:30,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:55:30,979 INFO L470 AbstractCegarLoop]: Abstraction has 139829 states and 157038 transitions. [2021-11-25 19:55:30,979 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 70.2) internal successors, (351), 5 states have internal predecessors, (351), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:30,979 INFO L276 IsEmpty]: Start isEmpty. Operand 139829 states and 157038 transitions. [2021-11-25 19:55:31,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 415 [2021-11-25 19:55:31,059 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:55:31,059 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-25 19:55:31,080 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2021-11-25 19:55:31,259 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-25 19:55:31,260 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:55:31,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:55:31,261 INFO L85 PathProgramCache]: Analyzing trace with hash -58937673, now seen corresponding path program 1 times [2021-11-25 19:55:31,261 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:55:31,261 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1532117403] [2021-11-25 19:55:31,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:55:31,261 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:55:31,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:55:32,009 INFO L134 CoverageAnalysis]: Checked inductivity of 543 backedges. 288 proven. 6 refuted. 0 times theorem prover too weak. 249 trivial. 0 not checked. [2021-11-25 19:55:32,010 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:55:32,010 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1532117403] [2021-11-25 19:55:32,010 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1532117403] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:55:32,010 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1762023920] [2021-11-25 19:55:32,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:55:32,010 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:55:32,010 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:55:32,035 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:55:32,103 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-25 19:55:32,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:55:32,428 INFO L263 TraceCheckSpWp]: Trace formula consists of 765 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 19:55:32,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:55:33,035 INFO L134 CoverageAnalysis]: Checked inductivity of 543 backedges. 378 proven. 0 refuted. 0 times theorem prover too weak. 165 trivial. 0 not checked. [2021-11-25 19:55:33,035 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 19:55:33,035 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1762023920] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:55:33,036 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 19:55:33,036 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 6 [2021-11-25 19:55:33,036 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1691598241] [2021-11-25 19:55:33,036 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:55:33,036 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:55:33,036 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:55:33,037 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:55:33,037 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:55:33,037 INFO L87 Difference]: Start difference. First operand 139829 states and 157038 transitions. Second operand has 3 states, 3 states have (on average 100.33333333333333) internal successors, (301), 3 states have internal predecessors, (301), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:34,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:55:34,520 INFO L93 Difference]: Finished difference Result 279113 states and 313293 transitions. [2021-11-25 19:55:34,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:55:34,521 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 100.33333333333333) internal successors, (301), 3 states have internal predecessors, (301), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 414 [2021-11-25 19:55:34,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:55:34,642 INFO L225 Difference]: With dead ends: 279113 [2021-11-25 19:55:34,643 INFO L226 Difference]: Without dead ends: 141831 [2021-11-25 19:55:34,680 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 417 GetRequests, 413 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-25 19:55:34,680 INFO L933 BasicCegarLoop]: 218 mSDtfsCounter, 137 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 426 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 137 SdHoareTripleChecker+Valid, 222 SdHoareTripleChecker+Invalid, 513 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 426 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-25 19:55:34,681 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [137 Valid, 222 Invalid, 513 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 426 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-25 19:55:34,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141831 states. [2021-11-25 19:55:36,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141831 to 141831. [2021-11-25 19:55:36,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141831 states, 141830 states have (on average 1.1224705633504901) internal successors, (159200), 141830 states have internal predecessors, (159200), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:37,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141831 states to 141831 states and 159200 transitions. [2021-11-25 19:55:37,055 INFO L78 Accepts]: Start accepts. Automaton has 141831 states and 159200 transitions. Word has length 414 [2021-11-25 19:55:37,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:55:37,055 INFO L470 AbstractCegarLoop]: Abstraction has 141831 states and 159200 transitions. [2021-11-25 19:55:37,055 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 100.33333333333333) internal successors, (301), 3 states have internal predecessors, (301), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:37,055 INFO L276 IsEmpty]: Start isEmpty. Operand 141831 states and 159200 transitions. [2021-11-25 19:55:37,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 441 [2021-11-25 19:55:37,145 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:55:37,145 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-25 19:55:37,169 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-25 19:55:37,351 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f953eb42-685d-44cf-aa70-c99e0d570420/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-25 19:55:37,351 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:55:37,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:55:37,352 INFO L85 PathProgramCache]: Analyzing trace with hash 568785222, now seen corresponding path program 1 times [2021-11-25 19:55:37,352 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:55:37,352 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2069557227] [2021-11-25 19:55:37,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:55:37,352 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:55:37,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:55:37,544 INFO L134 CoverageAnalysis]: Checked inductivity of 618 backedges. 354 proven. 0 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked. [2021-11-25 19:55:37,545 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:55:37,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2069557227] [2021-11-25 19:55:37,545 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2069557227] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:55:37,545 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:55:37,545 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 19:55:37,546 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1379884906] [2021-11-25 19:55:37,546 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:55:37,547 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 19:55:37,547 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:55:37,547 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 19:55:37,547 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:55:37,548 INFO L87 Difference]: Start difference. First operand 141831 states and 159200 transitions. Second operand has 4 states, 4 states have (on average 63.5) internal successors, (254), 3 states have internal predecessors, (254), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:55:40,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:55:40,189 INFO L93 Difference]: Finished difference Result 378355 states and 422311 transitions. [2021-11-25 19:55:40,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 19:55:40,190 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 63.5) internal successors, (254), 3 states have internal predecessors, (254), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 440 [2021-11-25 19:55:40,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:55:40,446 INFO L225 Difference]: With dead ends: 378355 [2021-11-25 19:55:40,446 INFO L226 Difference]: Without dead ends: 239071 [2021-11-25 19:55:40,495 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 19:55:40,496 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 380 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 578 mSolverCounterSat, 152 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 380 SdHoareTripleChecker+Valid, 222 SdHoareTripleChecker+Invalid, 730 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 152 IncrementalHoareTripleChecker+Valid, 578 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:55:40,496 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [380 Valid, 222 Invalid, 730 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [152 Valid, 578 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-25 19:55:40,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239071 states.