./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label44+token_ring.11.cil-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label44+token_ring.11.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 7c713aa7938ec5ae1ba06a0e41e275f2f1d72befd88a887a14dfcd6cc53c5088 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:03:24,840 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:03:24,844 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:03:24,910 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:03:24,911 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:03:24,913 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:03:24,915 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:03:24,918 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:03:24,921 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:03:24,922 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:03:24,924 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:03:24,926 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:03:24,926 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:03:24,928 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:03:24,930 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:03:24,933 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:03:24,934 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:03:24,936 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:03:24,939 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:03:24,942 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:03:24,945 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:03:24,947 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:03:24,949 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:03:24,951 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:03:24,956 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:03:24,957 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:03:24,958 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:03:24,959 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:03:24,960 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:03:24,962 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:03:24,963 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:03:24,964 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:03:24,966 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:03:24,967 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:03:24,969 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:03:24,970 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:03:24,971 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:03:24,972 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:03:24,972 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:03:24,974 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:03:24,975 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:03:24,976 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 02:03:25,011 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:03:25,011 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:03:25,012 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:03:25,012 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:03:25,013 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:03:25,013 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:03:25,014 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:03:25,014 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:03:25,014 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:03:25,015 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:03:25,015 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:03:25,015 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:03:25,016 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:03:25,016 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:03:25,016 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:03:25,017 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:03:25,017 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:03:25,017 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:03:25,018 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:03:25,019 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:03:25,019 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:03:25,019 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:03:25,019 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:03:25,020 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:03:25,020 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:03:25,020 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:03:25,021 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:03:25,021 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:03:25,021 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:03:25,022 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:03:25,022 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:03:25,022 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:03:25,023 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:03:25,023 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:03:25,023 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:03:25,024 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:03:25,024 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:03:25,024 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:03:25,025 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:03:25,025 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:03:25,025 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:03:25,025 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_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 7c713aa7938ec5ae1ba06a0e41e275f2f1d72befd88a887a14dfcd6cc53c5088 [2021-11-23 02:03:25,326 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:03:25,349 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:03:25,352 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:03:25,353 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:03:25,354 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:03:25,356 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/combinations/Problem05_label44+token_ring.11.cil-2.c [2021-11-23 02:03:25,438 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/data/028bdafb5/73e77812029c40b4a98c1b0cd5295017/FLAGad1fdace3 [2021-11-23 02:03:26,652 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:03:26,653 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/sv-benchmarks/c/combinations/Problem05_label44+token_ring.11.cil-2.c [2021-11-23 02:03:26,726 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/data/028bdafb5/73e77812029c40b4a98c1b0cd5295017/FLAGad1fdace3 [2021-11-23 02:03:26,827 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/data/028bdafb5/73e77812029c40b4a98c1b0cd5295017 [2021-11-23 02:03:26,831 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:03:26,833 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:03:26,835 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:03:26,835 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:03:26,839 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:03:26,840 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:03:26" (1/1) ... [2021-11-23 02:03:26,842 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@652675ca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:03:26, skipping insertion in model container [2021-11-23 02:03:26,843 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:03:26" (1/1) ... [2021-11-23 02:03:26,851 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:03:27,113 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:03:29,717 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_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/sv-benchmarks/c/combinations/Problem05_label44+token_ring.11.cil-2.c[377340,377353] [2021-11-23 02:03:29,756 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_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/sv-benchmarks/c/combinations/Problem05_label44+token_ring.11.cil-2.c[383339,383352] [2021-11-23 02:03:30,176 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:03:30,186 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:03:31,437 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_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/sv-benchmarks/c/combinations/Problem05_label44+token_ring.11.cil-2.c[377340,377353] [2021-11-23 02:03:31,447 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_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/sv-benchmarks/c/combinations/Problem05_label44+token_ring.11.cil-2.c[383339,383352] [2021-11-23 02:03:31,481 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:03:31,551 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:03:31,551 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:03:31 WrapperNode [2021-11-23 02:03:31,551 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:03:31,552 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:03:31,552 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:03:31,553 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:03:31,561 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:03:31" (1/1) ... [2021-11-23 02:03:31,671 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:03:31" (1/1) ... [2021-11-23 02:03:32,332 INFO L137 Inliner]: procedures = 66, calls = 74, calls flagged for inlining = 44, calls inlined = 44, statements flattened = 13141 [2021-11-23 02:03:32,332 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:03:32,334 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:03:32,334 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:03:32,334 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:03:32,344 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:03:31" (1/1) ... [2021-11-23 02:03:32,345 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:03:31" (1/1) ... [2021-11-23 02:03:32,451 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:03:31" (1/1) ... [2021-11-23 02:03:32,452 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:03:31" (1/1) ... [2021-11-23 02:03:32,784 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:03:31" (1/1) ... [2021-11-23 02:03:32,877 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:03:31" (1/1) ... [2021-11-23 02:03:32,905 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:03:31" (1/1) ... [2021-11-23 02:03:32,960 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:03:32,962 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:03:32,962 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:03:32,962 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:03:32,963 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:03:31" (1/1) ... [2021-11-23 02:03:32,970 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:03:32,981 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:03:32,999 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:03:33,017 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:03:33,053 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:03:33,053 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2021-11-23 02:03:33,053 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2021-11-23 02:03:33,053 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-23 02:03:33,054 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-23 02:03:33,054 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2021-11-23 02:03:33,054 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2021-11-23 02:03:33,054 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2021-11-23 02:03:33,054 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2021-11-23 02:03:33,054 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2021-11-23 02:03:33,054 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2021-11-23 02:03:33,054 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2021-11-23 02:03:33,055 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2021-11-23 02:03:33,055 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:03:33,055 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:03:33,055 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:03:33,358 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:03:33,368 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:03:41,400 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:03:44,496 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:03:44,496 INFO L301 CfgBuilder]: Removed 15 assume(true) statements. [2021-11-23 02:03:44,502 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:03:44 BoogieIcfgContainer [2021-11-23 02:03:44,503 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:03:44,505 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:03:44,505 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:03:44,509 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:03:44,510 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:03:26" (1/3) ... [2021-11-23 02:03:44,511 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@681b2668 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:03:44, skipping insertion in model container [2021-11-23 02:03:44,511 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:03:31" (2/3) ... [2021-11-23 02:03:44,511 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@681b2668 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:03:44, skipping insertion in model container [2021-11-23 02:03:44,512 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:03:44" (3/3) ... [2021-11-23 02:03:44,513 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem05_label44+token_ring.11.cil-2.c [2021-11-23 02:03:44,520 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:03:44,520 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-23 02:03:44,584 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:03:44,592 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 02:03:44,592 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-23 02:03:44,662 INFO L276 IsEmpty]: Start isEmpty. Operand has 1820 states, 1786 states have (on average 1.958006718924972) internal successors, (3497), 1789 states have internal predecessors, (3497), 25 states have call successors, (25), 6 states have call predecessors, (25), 6 states have return successors, (25), 25 states have call predecessors, (25), 25 states have call successors, (25) [2021-11-23 02:03:44,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-11-23 02:03:44,674 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:03:44,675 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] [2021-11-23 02:03:44,676 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:03:44,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:03:44,682 INFO L85 PathProgramCache]: Analyzing trace with hash -449936355, now seen corresponding path program 1 times [2021-11-23 02:03:44,692 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:03:44,693 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [552729559] [2021-11-23 02:03:44,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:03:44,694 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:03:44,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:03:45,171 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:03:45,172 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:03:45,172 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [552729559] [2021-11-23 02:03:45,173 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [552729559] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:03:45,173 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:03:45,174 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 02:03:45,175 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1680762912] [2021-11-23 02:03:45,176 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:03:45,180 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:03:45,180 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:03:45,256 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:03:45,257 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:03:45,266 INFO L87 Difference]: Start difference. First operand has 1820 states, 1786 states have (on average 1.958006718924972) internal successors, (3497), 1789 states have internal predecessors, (3497), 25 states have call successors, (25), 6 states have call predecessors, (25), 6 states have return successors, (25), 25 states have call predecessors, (25), 25 states have call successors, (25) Second operand has 4 states, 4 states have (on average 13.5) internal successors, (54), 4 states have internal predecessors, (54), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-23 02:03:46,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:03:46,477 INFO L93 Difference]: Finished difference Result 3800 states and 7371 transitions. [2021-11-23 02:03:46,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:03:46,480 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.5) internal successors, (54), 4 states have internal predecessors, (54), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 64 [2021-11-23 02:03:46,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:03:46,518 INFO L225 Difference]: With dead ends: 3800 [2021-11-23 02:03:46,519 INFO L226 Difference]: Without dead ends: 1979 [2021-11-23 02:03:46,535 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:03:46,539 INFO L933 BasicCegarLoop]: 3481 mSDtfsCounter, 3746 mSDsluCounter, 3689 mSDsCounter, 0 mSdLazyCounter, 710 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3746 SdHoareTripleChecker+Valid, 6868 SdHoareTripleChecker+Invalid, 724 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 710 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:03:46,540 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3746 Valid, 6868 Invalid, 724 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 710 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 02:03:46,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1979 states. [2021-11-23 02:03:46,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1979 to 1978. [2021-11-23 02:03:46,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1978 states, 1918 states have (on average 1.9228362877997915) internal successors, (3688), 1921 states have internal predecessors, (3688), 46 states have call successors, (46), 12 states have call predecessors, (46), 12 states have return successors, (46), 45 states have call predecessors, (46), 46 states have call successors, (46) [2021-11-23 02:03:46,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1978 states to 1978 states and 3780 transitions. [2021-11-23 02:03:46,833 INFO L78 Accepts]: Start accepts. Automaton has 1978 states and 3780 transitions. Word has length 64 [2021-11-23 02:03:46,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:03:46,834 INFO L470 AbstractCegarLoop]: Abstraction has 1978 states and 3780 transitions. [2021-11-23 02:03:46,834 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.5) internal successors, (54), 4 states have internal predecessors, (54), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-23 02:03:46,834 INFO L276 IsEmpty]: Start isEmpty. Operand 1978 states and 3780 transitions. [2021-11-23 02:03:46,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-11-23 02:03:46,846 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:03:46,847 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:03:46,847 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:03:46,848 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:03:46,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:03:46,849 INFO L85 PathProgramCache]: Analyzing trace with hash -863626105, now seen corresponding path program 1 times [2021-11-23 02:03:46,850 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:03:46,852 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [498066753] [2021-11-23 02:03:46,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:03:46,853 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:03:46,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:03:47,130 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:03:47,132 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:03:47,132 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [498066753] [2021-11-23 02:03:47,132 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [498066753] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:03:47,133 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2050753571] [2021-11-23 02:03:47,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:03:47,134 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:03:47,135 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:03:47,137 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:03:47,164 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:03:47,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:03:47,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 978 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:03:47,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:03:47,691 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 02:03:47,692 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:03:47,692 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2050753571] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:03:47,692 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:03:47,692 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 02:03:47,693 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2012909982] [2021-11-23 02:03:47,694 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:03:47,695 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:03:47,695 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:03:47,696 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:03:47,696 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:03:47,697 INFO L87 Difference]: Start difference. First operand 1978 states and 3780 transitions. Second operand has 3 states, 3 states have (on average 29.0) internal successors, (87), 2 states have internal predecessors, (87), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:03:48,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:03:48,233 INFO L93 Difference]: Finished difference Result 2635 states and 4805 transitions. [2021-11-23 02:03:48,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:03:48,234 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 2 states have internal predecessors, (87), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 129 [2021-11-23 02:03:48,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:03:48,263 INFO L225 Difference]: With dead ends: 2635 [2021-11-23 02:03:48,263 INFO L226 Difference]: Without dead ends: 2303 [2021-11-23 02:03:48,269 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:03:48,272 INFO L933 BasicCegarLoop]: 3326 mSDtfsCounter, 3501 mSDsluCounter, 250 mSDsCounter, 0 mSdLazyCounter, 310 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3501 SdHoareTripleChecker+Valid, 3536 SdHoareTripleChecker+Invalid, 312 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 310 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:03:48,274 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3501 Valid, 3536 Invalid, 312 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 310 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:03:48,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2303 states. [2021-11-23 02:03:48,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2303 to 2299. [2021-11-23 02:03:48,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2299 states, 2187 states have (on average 1.8715134887974394) internal successors, (4093), 2191 states have internal predecessors, (4093), 86 states have call successors, (86), 24 states have call predecessors, (86), 24 states have return successors, (86), 84 states have call predecessors, (86), 86 states have call successors, (86) [2021-11-23 02:03:48,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2299 states to 2299 states and 4265 transitions. [2021-11-23 02:03:48,425 INFO L78 Accepts]: Start accepts. Automaton has 2299 states and 4265 transitions. Word has length 129 [2021-11-23 02:03:48,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:03:48,427 INFO L470 AbstractCegarLoop]: Abstraction has 2299 states and 4265 transitions. [2021-11-23 02:03:48,428 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 2 states have internal predecessors, (87), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:03:48,428 INFO L276 IsEmpty]: Start isEmpty. Operand 2299 states and 4265 transitions. [2021-11-23 02:03:48,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-11-23 02:03:48,447 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:03:48,447 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:03:48,489 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:03:48,664 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:03:48,665 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:03:48,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:03:48,666 INFO L85 PathProgramCache]: Analyzing trace with hash -1375009719, now seen corresponding path program 1 times [2021-11-23 02:03:48,666 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:03:48,666 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2134032903] [2021-11-23 02:03:48,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:03:48,666 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:03:48,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:03:48,778 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:03:48,778 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:03:48,778 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2134032903] [2021-11-23 02:03:48,781 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2134032903] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:03:48,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1303556968] [2021-11-23 02:03:48,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:03:48,784 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:03:48,784 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:03:48,789 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:03:48,808 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:03:49,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:03:49,017 INFO L263 TraceCheckSpWp]: Trace formula consists of 972 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:03:49,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:03:49,281 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-23 02:03:49,282 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:03:49,282 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1303556968] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:03:49,282 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:03:49,283 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 02:03:49,283 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [565748466] [2021-11-23 02:03:49,283 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:03:49,284 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:03:49,284 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:03:49,285 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:03:49,285 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:03:49,285 INFO L87 Difference]: Start difference. First operand 2299 states and 4265 transitions. Second operand has 3 states, 3 states have (on average 27.0) internal successors, (81), 2 states have internal predecessors, (81), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:03:49,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:03:49,821 INFO L93 Difference]: Finished difference Result 3592 states and 6276 transitions. [2021-11-23 02:03:49,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:03:49,822 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 2 states have internal predecessors, (81), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 129 [2021-11-23 02:03:49,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:03:49,846 INFO L225 Difference]: With dead ends: 3592 [2021-11-23 02:03:49,847 INFO L226 Difference]: Without dead ends: 2939 [2021-11-23 02:03:49,852 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:03:49,855 INFO L933 BasicCegarLoop]: 3325 mSDtfsCounter, 3507 mSDsluCounter, 250 mSDsCounter, 0 mSdLazyCounter, 310 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3507 SdHoareTripleChecker+Valid, 3535 SdHoareTripleChecker+Invalid, 312 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 310 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:03:49,857 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3507 Valid, 3535 Invalid, 312 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 310 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:03:49,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2939 states. [2021-11-23 02:03:49,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2939 to 2933. [2021-11-23 02:03:49,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2933 states, 2719 states have (on average 1.7988230967267378) internal successors, (4891), 2725 states have internal predecessors, (4891), 164 states have call successors, (164), 48 states have call predecessors, (164), 48 states have return successors, (164), 160 states have call predecessors, (164), 164 states have call successors, (164) [2021-11-23 02:03:50,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2933 states to 2933 states and 5219 transitions. [2021-11-23 02:03:50,012 INFO L78 Accepts]: Start accepts. Automaton has 2933 states and 5219 transitions. Word has length 129 [2021-11-23 02:03:50,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:03:50,014 INFO L470 AbstractCegarLoop]: Abstraction has 2933 states and 5219 transitions. [2021-11-23 02:03:50,014 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.0) internal successors, (81), 2 states have internal predecessors, (81), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:03:50,014 INFO L276 IsEmpty]: Start isEmpty. Operand 2933 states and 5219 transitions. [2021-11-23 02:03:50,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-11-23 02:03:50,022 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:03:50,024 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:03:50,062 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 02:03:50,240 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:03:50,241 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:03:50,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:03:50,241 INFO L85 PathProgramCache]: Analyzing trace with hash 847221387, now seen corresponding path program 1 times [2021-11-23 02:03:50,242 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:03:50,242 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1227543106] [2021-11-23 02:03:50,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:03:50,242 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:03:50,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:03:50,327 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:03:50,327 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:03:50,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1227543106] [2021-11-23 02:03:50,328 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1227543106] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:03:50,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1604970785] [2021-11-23 02:03:50,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:03:50,329 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:03:50,329 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:03:50,330 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:03:50,347 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:03:50,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:03:50,560 INFO L263 TraceCheckSpWp]: Trace formula consists of 966 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:03:50,568 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:03:50,825 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-23 02:03:50,825 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:03:50,825 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1604970785] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:03:50,826 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:03:50,826 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 02:03:50,826 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1336673968] [2021-11-23 02:03:50,826 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:03:50,827 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:03:50,827 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:03:50,827 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:03:50,828 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:03:50,828 INFO L87 Difference]: Start difference. First operand 2933 states and 5219 transitions. Second operand has 3 states, 3 states have (on average 26.0) internal successors, (78), 2 states have internal predecessors, (78), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:03:51,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:03:51,399 INFO L93 Difference]: Finished difference Result 5482 states and 9168 transitions. [2021-11-23 02:03:51,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:03:51,400 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.0) internal successors, (78), 2 states have internal predecessors, (78), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 129 [2021-11-23 02:03:51,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:03:51,431 INFO L225 Difference]: With dead ends: 5482 [2021-11-23 02:03:51,431 INFO L226 Difference]: Without dead ends: 4195 [2021-11-23 02:03:51,439 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:03:51,440 INFO L933 BasicCegarLoop]: 3294 mSDtfsCounter, 3510 mSDsluCounter, 250 mSDsCounter, 0 mSdLazyCounter, 307 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3510 SdHoareTripleChecker+Valid, 3504 SdHoareTripleChecker+Invalid, 309 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 307 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:03:51,441 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3510 Valid, 3504 Invalid, 309 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 307 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:03:51,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4195 states. [2021-11-23 02:03:51,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4195 to 4185. [2021-11-23 02:03:51,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4185 states, 3771 states have (on average 1.7138690002651817) internal successors, (6463), 3781 states have internal predecessors, (6463), 316 states have call successors, (316), 96 states have call predecessors, (316), 96 states have return successors, (316), 308 states have call predecessors, (316), 316 states have call successors, (316) [2021-11-23 02:03:51,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4185 states to 4185 states and 7095 transitions. [2021-11-23 02:03:51,635 INFO L78 Accepts]: Start accepts. Automaton has 4185 states and 7095 transitions. Word has length 129 [2021-11-23 02:03:51,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:03:51,636 INFO L470 AbstractCegarLoop]: Abstraction has 4185 states and 7095 transitions. [2021-11-23 02:03:51,636 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.0) internal successors, (78), 2 states have internal predecessors, (78), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:03:51,636 INFO L276 IsEmpty]: Start isEmpty. Operand 4185 states and 7095 transitions. [2021-11-23 02:03:51,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-11-23 02:03:51,645 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:03:51,645 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:03:51,684 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 02:03:51,872 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:03:51,873 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:03:51,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:03:51,873 INFO L85 PathProgramCache]: Analyzing trace with hash 708199689, now seen corresponding path program 1 times [2021-11-23 02:03:51,873 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:03:51,874 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1623546754] [2021-11-23 02:03:51,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:03:51,874 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:03:51,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:03:51,960 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:03:51,960 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:03:51,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1623546754] [2021-11-23 02:03:51,960 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1623546754] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:03:51,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1517560514] [2021-11-23 02:03:51,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:03:51,961 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:03:51,961 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:03:51,962 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:03:51,968 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 02:03:52,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:03:52,245 INFO L263 TraceCheckSpWp]: Trace formula consists of 960 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:03:52,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:03:52,492 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 02:03:52,492 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:03:52,492 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1517560514] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:03:52,492 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:03:52,493 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 02:03:52,493 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1492865865] [2021-11-23 02:03:52,493 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:03:52,494 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:03:52,494 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:03:52,494 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:03:52,495 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:03:52,495 INFO L87 Difference]: Start difference. First operand 4185 states and 7095 transitions. Second operand has 3 states, 3 states have (on average 33.0) internal successors, (99), 2 states have internal predecessors, (99), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:03:53,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:03:53,287 INFO L93 Difference]: Finished difference Result 9214 states and 14852 transitions. [2021-11-23 02:03:53,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:03:53,288 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.0) internal successors, (99), 2 states have internal predecessors, (99), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 129 [2021-11-23 02:03:53,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:03:53,344 INFO L225 Difference]: With dead ends: 9214 [2021-11-23 02:03:53,345 INFO L226 Difference]: Without dead ends: 6675 [2021-11-23 02:03:53,360 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:03:53,363 INFO L933 BasicCegarLoop]: 3294 mSDtfsCounter, 3489 mSDsluCounter, 250 mSDsCounter, 0 mSdLazyCounter, 307 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3489 SdHoareTripleChecker+Valid, 3504 SdHoareTripleChecker+Invalid, 309 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 307 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:03:53,364 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3489 Valid, 3504 Invalid, 309 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 307 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:03:53,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6675 states. [2021-11-23 02:03:53,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6675 to 6657. [2021-11-23 02:03:53,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6657 states, 5851 states have (on average 1.6337378225944283) internal successors, (9559), 5869 states have internal predecessors, (9559), 612 states have call successors, (612), 192 states have call predecessors, (612), 192 states have return successors, (612), 596 states have call predecessors, (612), 612 states have call successors, (612) [2021-11-23 02:03:53,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6657 states to 6657 states and 10783 transitions. [2021-11-23 02:03:53,827 INFO L78 Accepts]: Start accepts. Automaton has 6657 states and 10783 transitions. Word has length 129 [2021-11-23 02:03:53,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:03:53,828 INFO L470 AbstractCegarLoop]: Abstraction has 6657 states and 10783 transitions. [2021-11-23 02:03:53,829 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.0) internal successors, (99), 2 states have internal predecessors, (99), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:03:53,829 INFO L276 IsEmpty]: Start isEmpty. Operand 6657 states and 10783 transitions. [2021-11-23 02:03:53,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-11-23 02:03:53,847 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:03:53,847 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:03:53,886 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 02:03:54,072 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:03:54,073 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:03:54,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:03:54,073 INFO L85 PathProgramCache]: Analyzing trace with hash 672612299, now seen corresponding path program 1 times [2021-11-23 02:03:54,073 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:03:54,073 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1965227123] [2021-11-23 02:03:54,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:03:54,074 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:03:54,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:03:54,187 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:03:54,188 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:03:54,188 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1965227123] [2021-11-23 02:03:54,188 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1965227123] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:03:54,189 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [393415016] [2021-11-23 02:03:54,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:03:54,189 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:03:54,189 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:03:54,190 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:03:54,208 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 02:03:54,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:03:54,416 INFO L263 TraceCheckSpWp]: Trace formula consists of 954 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:03:54,421 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:03:54,669 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 02:03:54,669 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:03:54,669 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [393415016] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:03:54,670 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:03:54,670 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 02:03:54,670 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1331684429] [2021-11-23 02:03:54,671 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:03:54,672 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:03:54,672 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:03:54,672 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:03:54,673 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:03:54,673 INFO L87 Difference]: Start difference. First operand 6657 states and 10783 transitions. Second operand has 3 states, 3 states have (on average 35.0) internal successors, (105), 2 states have internal predecessors, (105), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:03:55,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:03:55,543 INFO L93 Difference]: Finished difference Result 16582 states and 26020 transitions. [2021-11-23 02:03:55,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:03:55,544 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.0) internal successors, (105), 2 states have internal predecessors, (105), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 129 [2021-11-23 02:03:55,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:03:55,649 INFO L225 Difference]: With dead ends: 16582 [2021-11-23 02:03:55,650 INFO L226 Difference]: Without dead ends: 11571 [2021-11-23 02:03:55,675 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:03:55,679 INFO L933 BasicCegarLoop]: 3294 mSDtfsCounter, 3483 mSDsluCounter, 250 mSDsCounter, 0 mSdLazyCounter, 307 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3483 SdHoareTripleChecker+Valid, 3504 SdHoareTripleChecker+Invalid, 309 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 307 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:03:55,679 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3483 Valid, 3504 Invalid, 309 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 307 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:03:55,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11571 states. [2021-11-23 02:03:56,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11571 to 11537. [2021-11-23 02:03:56,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11537 states, 9963 states have (on average 1.571313861286761) internal successors, (15655), 9997 states have internal predecessors, (15655), 1188 states have call successors, (1188), 384 states have call predecessors, (1188), 384 states have return successors, (1188), 1156 states have call predecessors, (1188), 1188 states have call successors, (1188) [2021-11-23 02:03:56,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11537 states to 11537 states and 18031 transitions. [2021-11-23 02:03:56,299 INFO L78 Accepts]: Start accepts. Automaton has 11537 states and 18031 transitions. Word has length 129 [2021-11-23 02:03:56,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:03:56,300 INFO L470 AbstractCegarLoop]: Abstraction has 11537 states and 18031 transitions. [2021-11-23 02:03:56,302 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.0) internal successors, (105), 2 states have internal predecessors, (105), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:03:56,302 INFO L276 IsEmpty]: Start isEmpty. Operand 11537 states and 18031 transitions. [2021-11-23 02:03:56,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-11-23 02:03:56,331 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:03:56,332 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:03:56,371 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 02:03:56,556 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-23 02:03:56,557 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:03:56,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:03:56,557 INFO L85 PathProgramCache]: Analyzing trace with hash 1978921997, now seen corresponding path program 1 times [2021-11-23 02:03:56,558 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:03:56,558 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1570028570] [2021-11-23 02:03:56,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:03:56,558 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:03:56,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:03:56,660 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 02:03:56,661 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:03:56,661 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1570028570] [2021-11-23 02:03:56,661 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1570028570] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:03:56,661 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1137365767] [2021-11-23 02:03:56,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:03:56,662 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:03:56,662 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:03:56,663 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:03:56,684 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 02:03:56,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:03:56,888 INFO L263 TraceCheckSpWp]: Trace formula consists of 948 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:03:56,892 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:03:57,148 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 02:03:57,149 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:03:57,149 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1137365767] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:03:57,149 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:03:57,149 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 02:03:57,150 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1714398479] [2021-11-23 02:03:57,150 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:03:57,151 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:03:57,151 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:03:57,152 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:03:57,152 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:03:57,152 INFO L87 Difference]: Start difference. First operand 11537 states and 18031 transitions. Second operand has 3 states, 3 states have (on average 31.0) internal successors, (93), 2 states have internal predecessors, (93), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:03:58,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:03:58,334 INFO L93 Difference]: Finished difference Result 31126 states and 47956 transitions. [2021-11-23 02:03:58,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:03:58,335 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 2 states have internal predecessors, (93), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 129 [2021-11-23 02:03:58,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:03:58,439 INFO L225 Difference]: With dead ends: 31126 [2021-11-23 02:03:58,439 INFO L226 Difference]: Without dead ends: 21235 [2021-11-23 02:03:58,488 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:03:58,489 INFO L933 BasicCegarLoop]: 3294 mSDtfsCounter, 3495 mSDsluCounter, 250 mSDsCounter, 0 mSdLazyCounter, 307 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3495 SdHoareTripleChecker+Valid, 3504 SdHoareTripleChecker+Invalid, 309 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 307 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:03:58,489 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3495 Valid, 3504 Invalid, 309 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 307 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:03:58,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21235 states. [2021-11-23 02:03:59,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21235 to 21169. [2021-11-23 02:03:59,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21169 states, 18091 states have (on average 1.5286606599966834) internal successors, (27655), 18157 states have internal predecessors, (27655), 2308 states have call successors, (2308), 768 states have call predecessors, (2308), 768 states have return successors, (2308), 2244 states have call predecessors, (2308), 2308 states have call successors, (2308) [2021-11-23 02:03:59,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21169 states to 21169 states and 32271 transitions. [2021-11-23 02:03:59,459 INFO L78 Accepts]: Start accepts. Automaton has 21169 states and 32271 transitions. Word has length 129 [2021-11-23 02:03:59,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:03:59,460 INFO L470 AbstractCegarLoop]: Abstraction has 21169 states and 32271 transitions. [2021-11-23 02:03:59,460 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 2 states have internal predecessors, (93), 2 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 02:03:59,461 INFO L276 IsEmpty]: Start isEmpty. Operand 21169 states and 32271 transitions. [2021-11-23 02:03:59,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-11-23 02:03:59,500 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:03:59,501 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:03:59,539 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 02:03:59,724 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca6451f8-bda4-44ec-885b-8dbe5000a6aa/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-23 02:03:59,725 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:03:59,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:03:59,725 INFO L85 PathProgramCache]: Analyzing trace with hash 2016040271, now seen corresponding path program 1 times [2021-11-23 02:03:59,725 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:03:59,725 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1155453200] [2021-11-23 02:03:59,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:03:59,726 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:03:59,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:03:59,851 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 02:03:59,851 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:03:59,852 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1155453200] [2021-11-23 02:03:59,852 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1155453200] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:03:59,852 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:03:59,852 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:03:59,853 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [28105471] [2021-11-23 02:03:59,853 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:03:59,853 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:03:59,854 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:03:59,854 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:03:59,854 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:03:59,854 INFO L87 Difference]: Start difference. First operand 21169 states and 32271 transitions. Second operand has 6 states, 6 states have (on average 12.5) internal successors, (75), 6 states have internal predecessors, (75), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 02:04:02,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:04:02,339 INFO L93 Difference]: Finished difference Result 66869 states and 100498 transitions. [2021-11-23 02:04:02,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 02:04:02,340 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.5) internal successors, (75), 6 states have internal predecessors, (75), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 129 [2021-11-23 02:04:02,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:04:02,876 INFO L225 Difference]: With dead ends: 66869 [2021-11-23 02:04:02,876 INFO L226 Difference]: Without dead ends: 47347 [2021-11-23 02:04:02,936 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-23 02:04:02,937 INFO L933 BasicCegarLoop]: 3306 mSDtfsCounter, 4189 mSDsluCounter, 7037 mSDsCounter, 0 mSdLazyCounter, 916 mSolverCounterSat, 140 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4209 SdHoareTripleChecker+Valid, 9835 SdHoareTripleChecker+Invalid, 1056 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 140 IncrementalHoareTripleChecker+Valid, 916 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:04:02,938 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4209 Valid, 9835 Invalid, 1056 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [140 Valid, 916 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 02:04:02,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47347 states. [2021-11-23 02:04:05,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47347 to 39921. [2021-11-23 02:04:05,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39921 states, 33899 states have (on average 1.5011357267176022) internal successors, (50887), 34029 states have internal predecessors, (50887), 4484 states have call successors, (4484), 1536 states have call predecessors, (4484), 1536 states have return successors, (4484), 4356 states have call predecessors, (4484), 4484 states have call successors, (4484) [2021-11-23 02:04:05,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39921 states to 39921 states and 59855 transitions. [2021-11-23 02:04:05,468 INFO L78 Accepts]: Start accepts. Automaton has 39921 states and 59855 transitions. Word has length 129 [2021-11-23 02:04:05,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:04:05,470 INFO L470 AbstractCegarLoop]: Abstraction has 39921 states and 59855 transitions. [2021-11-23 02:04:05,470 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.5) internal successors, (75), 6 states have internal predecessors, (75), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 02:04:05,471 INFO L276 IsEmpty]: Start isEmpty. Operand 39921 states and 59855 transitions. [2021-11-23 02:04:05,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-23 02:04:05,546 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:04:05,547 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:04:05,547 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-23 02:04:05,547 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:04:05,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:04:05,548 INFO L85 PathProgramCache]: Analyzing trace with hash -1258941252, now seen corresponding path program 1 times [2021-11-23 02:04:05,548 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:04:05,548 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [736198789] [2021-11-23 02:04:05,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:05,549 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:04:05,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:05,688 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 02:04:05,688 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:04:05,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [736198789] [2021-11-23 02:04:05,688 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [736198789] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:04:05,688 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:04:05,689 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:04:05,689 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1070465567] [2021-11-23 02:04:05,689 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:04:05,689 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:04:05,690 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:04:05,690 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:04:05,690 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:04:05,691 INFO L87 Difference]: Start difference. First operand 39921 states and 59855 transitions. Second operand has 6 states, 6 states have (on average 12.666666666666666) internal successors, (76), 6 states have internal predecessors, (76), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 02:04:09,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:04:09,358 INFO L93 Difference]: Finished difference Result 125941 states and 187986 transitions. [2021-11-23 02:04:09,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 02:04:09,358 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.666666666666666) internal successors, (76), 6 states have internal predecessors, (76), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 130 [2021-11-23 02:04:09,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:04:10,132 INFO L225 Difference]: With dead ends: 125941 [2021-11-23 02:04:10,132 INFO L226 Difference]: Without dead ends: 87667 [2021-11-23 02:04:10,232 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-23 02:04:10,235 INFO L933 BasicCegarLoop]: 3276 mSDtfsCounter, 4123 mSDsluCounter, 10400 mSDsCounter, 0 mSdLazyCounter, 1190 mSolverCounterSat, 152 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4143 SdHoareTripleChecker+Valid, 12934 SdHoareTripleChecker+Invalid, 1342 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 152 IncrementalHoareTripleChecker+Valid, 1190 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:04:10,236 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4143 Valid, 12934 Invalid, 1342 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [152 Valid, 1190 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-23 02:04:10,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87667 states. [2021-11-23 02:04:13,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87667 to 76657. [2021-11-23 02:04:13,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76657 states, 64875 states have (on average 1.4828362235067438) internal successors, (96199), 65133 states have internal predecessors, (96199), 8708 states have call successors, (8708), 3072 states have call predecessors, (8708), 3072 states have return successors, (8708), 8452 states have call predecessors, (8708), 8708 states have call successors, (8708) [2021-11-23 02:04:14,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76657 states to 76657 states and 113615 transitions. [2021-11-23 02:04:14,459 INFO L78 Accepts]: Start accepts. Automaton has 76657 states and 113615 transitions. Word has length 130 [2021-11-23 02:04:14,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:04:14,460 INFO L470 AbstractCegarLoop]: Abstraction has 76657 states and 113615 transitions. [2021-11-23 02:04:14,460 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.666666666666666) internal successors, (76), 6 states have internal predecessors, (76), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 02:04:14,460 INFO L276 IsEmpty]: Start isEmpty. Operand 76657 states and 113615 transitions. [2021-11-23 02:04:14,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2021-11-23 02:04:14,576 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:04:14,576 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:04:14,577 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-23 02:04:14,577 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:04:14,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:04:14,577 INFO L85 PathProgramCache]: Analyzing trace with hash -1866644625, now seen corresponding path program 1 times [2021-11-23 02:04:14,578 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:04:14,578 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1794645926] [2021-11-23 02:04:14,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:14,578 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:04:14,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:14,707 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 02:04:14,707 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:04:14,708 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1794645926] [2021-11-23 02:04:14,708 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1794645926] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:04:14,708 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:04:14,708 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:04:14,710 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1321082089] [2021-11-23 02:04:14,711 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:04:14,711 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:04:14,711 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:04:14,712 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:04:14,712 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:04:14,712 INFO L87 Difference]: Start difference. First operand 76657 states and 113615 transitions. Second operand has 6 states, 6 states have (on average 12.833333333333334) internal successors, (77), 6 states have internal predecessors, (77), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 02:04:22,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:04:22,121 INFO L93 Difference]: Finished difference Result 264565 states and 390098 transitions. [2021-11-23 02:04:22,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 02:04:22,121 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.833333333333334) internal successors, (77), 6 states have internal predecessors, (77), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 131 [2021-11-23 02:04:22,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:04:22,986 INFO L225 Difference]: With dead ends: 264565 [2021-11-23 02:04:22,986 INFO L226 Difference]: Without dead ends: 189555 [2021-11-23 02:04:23,219 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=69, Unknown=0, NotChecked=0, Total=110 [2021-11-23 02:04:23,220 INFO L933 BasicCegarLoop]: 3296 mSDtfsCounter, 4247 mSDsluCounter, 10463 mSDsCounter, 0 mSdLazyCounter, 1210 mSolverCounterSat, 140 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4267 SdHoareTripleChecker+Valid, 13006 SdHoareTripleChecker+Invalid, 1350 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 140 IncrementalHoareTripleChecker+Valid, 1210 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:04:23,222 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4267 Valid, 13006 Invalid, 1350 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [140 Valid, 1210 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-23 02:04:23,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189555 states. [2021-11-23 02:04:30,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189555 to 148593. [2021-11-23 02:04:30,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148593 states, 125547 states have (on average 1.4697205030785283) internal successors, (184519), 126061 states have internal predecessors, (184519), 16900 states have call successors, (16900), 6144 states have call predecessors, (16900), 6144 states have return successors, (16900), 16388 states have call predecessors, (16900), 16900 states have call successors, (16900) [2021-11-23 02:04:30,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148593 states to 148593 states and 218319 transitions. [2021-11-23 02:04:30,872 INFO L78 Accepts]: Start accepts. Automaton has 148593 states and 218319 transitions. Word has length 131 [2021-11-23 02:04:30,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:04:30,873 INFO L470 AbstractCegarLoop]: Abstraction has 148593 states and 218319 transitions. [2021-11-23 02:04:30,873 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.833333333333334) internal successors, (77), 6 states have internal predecessors, (77), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 02:04:30,874 INFO L276 IsEmpty]: Start isEmpty. Operand 148593 states and 218319 transitions. [2021-11-23 02:04:31,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-11-23 02:04:31,064 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:04:31,065 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:04:31,065 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-23 02:04:31,065 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:04:31,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:04:31,066 INFO L85 PathProgramCache]: Analyzing trace with hash 1499485720, now seen corresponding path program 1 times [2021-11-23 02:04:31,066 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:04:31,066 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [376136905] [2021-11-23 02:04:31,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:31,067 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:04:31,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:31,217 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2021-11-23 02:04:31,217 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:04:31,217 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [376136905] [2021-11-23 02:04:31,217 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [376136905] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:04:31,218 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:04:31,218 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-23 02:04:31,218 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [879817272] [2021-11-23 02:04:31,218 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:04:31,219 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 02:04:31,219 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:04:31,220 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 02:04:31,220 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:04:31,220 INFO L87 Difference]: Start difference. First operand 148593 states and 218319 transitions. Second operand has 6 states, 6 states have (on average 13.0) internal successors, (78), 6 states have internal predecessors, (78), 4 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8)