./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/Problem05_label40+token_ring.04.cil-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/Problem05_label40+token_ring.04.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash f360dda009e25a73435ad605bf6b2f1b0f95e4925e3a6f627d3b33f05412514d --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 00:39:57,120 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 00:39:57,123 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 00:39:57,177 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 00:39:57,178 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 00:39:57,183 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 00:39:57,186 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 00:39:57,191 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 00:39:57,195 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 00:39:57,201 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 00:39:57,202 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 00:39:57,205 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 00:39:57,205 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 00:39:57,208 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 00:39:57,211 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 00:39:57,230 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 00:39:57,232 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 00:39:57,233 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 00:39:57,238 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 00:39:57,246 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 00:39:57,249 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 00:39:57,250 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 00:39:57,254 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 00:39:57,255 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 00:39:57,264 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 00:39:57,265 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 00:39:57,265 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 00:39:57,267 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 00:39:57,268 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 00:39:57,269 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 00:39:57,270 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 00:39:57,278 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 00:39:57,281 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 00:39:57,282 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 00:39:57,283 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 00:39:57,284 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 00:39:57,284 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 00:39:57,285 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 00:39:57,285 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 00:39:57,286 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 00:39:57,286 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 00:39:57,287 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 00:39:57,330 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 00:39:57,331 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 00:39:57,331 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 00:39:57,331 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 00:39:57,335 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 00:39:57,335 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 00:39:57,335 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 00:39:57,335 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 00:39:57,336 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 00:39:57,336 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 00:39:57,337 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 00:39:57,337 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 00:39:57,337 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 00:39:57,337 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 00:39:57,338 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 00:39:57,338 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 00:39:57,338 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 00:39:57,338 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 00:39:57,339 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 00:39:57,339 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 00:39:57,339 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 00:39:57,340 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 00:39:57,340 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 00:39:57,340 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 00:39:57,340 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 00:39:57,341 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 00:39:57,341 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 00:39:57,341 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 00:39:57,341 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 00:39:57,341 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 00:39:57,342 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 00:39:57,342 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 00:39:57,342 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:39:57,342 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 00:39:57,343 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 00:39:57,343 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 00:39:57,343 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 00:39:57,343 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 00:39:57,343 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 00:39:57,343 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 00:39:57,344 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 00:39:57,344 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_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> f360dda009e25a73435ad605bf6b2f1b0f95e4925e3a6f627d3b33f05412514d [2021-11-21 00:39:57,678 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 00:39:57,702 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 00:39:57,705 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 00:39:57,707 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 00:39:57,708 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 00:39:57,710 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/combinations/Problem05_label40+token_ring.04.cil-1.c [2021-11-21 00:39:57,796 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/data/4014f6b85/379438129a7440809e4f95607e4c83b5/FLAG2cae34833 [2021-11-21 00:39:59,259 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 00:39:59,260 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/sv-benchmarks/c/combinations/Problem05_label40+token_ring.04.cil-1.c [2021-11-21 00:39:59,353 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/data/4014f6b85/379438129a7440809e4f95607e4c83b5/FLAG2cae34833 [2021-11-21 00:39:59,774 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/data/4014f6b85/379438129a7440809e4f95607e4c83b5 [2021-11-21 00:39:59,778 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 00:39:59,781 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 00:39:59,786 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 00:39:59,787 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 00:39:59,791 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 00:39:59,793 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:39:59" (1/1) ... [2021-11-21 00:39:59,794 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6947a08f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:39:59, skipping insertion in model container [2021-11-21 00:39:59,795 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:39:59" (1/1) ... [2021-11-21 00:39:59,804 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 00:40:00,092 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 00:40:02,758 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_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/sv-benchmarks/c/combinations/Problem05_label40+token_ring.04.cil-1.c[377069,377082] [2021-11-21 00:40:02,827 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_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/sv-benchmarks/c/combinations/Problem05_label40+token_ring.04.cil-1.c[383339,383352] [2021-11-21 00:40:03,031 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:40:03,046 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 00:40:04,427 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_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/sv-benchmarks/c/combinations/Problem05_label40+token_ring.04.cil-1.c[377069,377082] [2021-11-21 00:40:04,440 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_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/sv-benchmarks/c/combinations/Problem05_label40+token_ring.04.cil-1.c[383339,383352] [2021-11-21 00:40:04,470 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:40:04,568 INFO L208 MainTranslator]: Completed translation [2021-11-21 00:40:04,569 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:40:04 WrapperNode [2021-11-21 00:40:04,569 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 00:40:04,571 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 00:40:04,571 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 00:40:04,571 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 00:40:04,585 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:40:04" (1/1) ... [2021-11-21 00:40:04,720 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:40:04" (1/1) ... [2021-11-21 00:40:05,244 INFO L137 Inliner]: procedures = 52, calls = 53, calls flagged for inlining = 30, calls inlined = 30, statements flattened = 12735 [2021-11-21 00:40:05,245 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 00:40:05,246 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 00:40:05,247 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 00:40:05,247 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 00:40:05,259 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:40:04" (1/1) ... [2021-11-21 00:40:05,259 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:40:04" (1/1) ... [2021-11-21 00:40:05,308 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:40:04" (1/1) ... [2021-11-21 00:40:05,308 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:40:04" (1/1) ... [2021-11-21 00:40:05,655 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:40:04" (1/1) ... [2021-11-21 00:40:05,822 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:40:04" (1/1) ... [2021-11-21 00:40:05,887 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:40:04" (1/1) ... [2021-11-21 00:40:05,945 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 00:40:05,947 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 00:40:05,947 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 00:40:05,947 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 00:40:05,948 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:40:04" (1/1) ... [2021-11-21 00:40:05,957 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:40:05,970 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:40:05,987 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 00:40:06,000 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 00:40:06,040 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 00:40:06,041 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2021-11-21 00:40:06,041 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2021-11-21 00:40:06,041 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-21 00:40:06,042 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-21 00:40:06,042 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2021-11-21 00:40:06,042 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2021-11-21 00:40:06,042 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2021-11-21 00:40:06,042 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2021-11-21 00:40:06,043 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2021-11-21 00:40:06,043 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2021-11-21 00:40:06,043 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2021-11-21 00:40:06,043 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2021-11-21 00:40:06,043 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 00:40:06,044 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 00:40:06,044 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 00:40:06,257 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 00:40:06,259 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 00:40:15,025 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 00:40:17,485 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 00:40:17,486 INFO L301 CfgBuilder]: Removed 8 assume(true) statements. [2021-11-21 00:40:17,492 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:40:17 BoogieIcfgContainer [2021-11-21 00:40:17,492 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 00:40:17,494 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 00:40:17,495 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 00:40:17,498 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 00:40:17,498 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 12:39:59" (1/3) ... [2021-11-21 00:40:17,499 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4f5cbc24 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:40:17, skipping insertion in model container [2021-11-21 00:40:17,499 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:40:04" (2/3) ... [2021-11-21 00:40:17,500 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4f5cbc24 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:40:17, skipping insertion in model container [2021-11-21 00:40:17,500 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:40:17" (3/3) ... [2021-11-21 00:40:17,502 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem05_label40+token_ring.04.cil-1.c [2021-11-21 00:40:17,508 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 00:40:17,508 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-21 00:40:17,571 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 00:40:17,579 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-21 00:40:17,580 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-21 00:40:17,643 INFO L276 IsEmpty]: Start isEmpty. Operand has 1743 states, 1716 states have (on average 1.9726107226107226) internal successors, (3385), 1719 states have internal predecessors, (3385), 18 states have call successors, (18), 6 states have call predecessors, (18), 6 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) [2021-11-21 00:40:17,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-21 00:40:17,651 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:40:17,652 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:40:17,654 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:40:17,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:40:17,663 INFO L85 PathProgramCache]: Analyzing trace with hash 909227624, now seen corresponding path program 1 times [2021-11-21 00:40:17,671 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:40:17,672 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1600226373] [2021-11-21 00:40:17,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:40:17,673 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:40:17,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:40:17,931 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:40:17,932 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:40:17,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1600226373] [2021-11-21 00:40:17,933 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1600226373] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:40:17,933 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:40:17,933 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:40:17,935 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1783323476] [2021-11-21 00:40:17,935 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:40:17,939 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:40:17,940 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:40:17,995 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:40:17,996 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:40:18,003 INFO L87 Difference]: Start difference. First operand has 1743 states, 1716 states have (on average 1.9726107226107226) internal successors, (3385), 1719 states have internal predecessors, (3385), 18 states have call successors, (18), 6 states have call predecessors, (18), 6 states have return successors, (18), 18 states have call predecessors, (18), 18 states have call successors, (18) Second operand has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 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) [2021-11-21 00:40:19,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:40:19,277 INFO L93 Difference]: Finished difference Result 3569 states and 6979 transitions. [2021-11-21 00:40:19,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:40:19,280 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 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 43 [2021-11-21 00:40:19,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:40:19,313 INFO L225 Difference]: With dead ends: 3569 [2021-11-21 00:40:19,314 INFO L226 Difference]: Without dead ends: 1825 [2021-11-21 00:40:19,326 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 [2021-11-21 00:40:19,333 INFO L933 BasicCegarLoop]: 3271 mSDtfsCounter, 3515 mSDsluCounter, 3465 mSDsCounter, 0 mSdLazyCounter, 598 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3515 SdHoareTripleChecker+Valid, 6476 SdHoareTripleChecker+Invalid, 612 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 598 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-21 00:40:19,336 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3515 Valid, 6476 Invalid, 612 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 598 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-21 00:40:19,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1825 states. [2021-11-21 00:40:19,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1825 to 1824. [2021-11-21 00:40:19,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1824 states, 1778 states have (on average 1.9482564679415073) internal successors, (3464), 1781 states have internal predecessors, (3464), 32 states have call successors, (32), 12 states have call predecessors, (32), 12 states have return successors, (32), 31 states have call predecessors, (32), 32 states have call successors, (32) [2021-11-21 00:40:19,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1824 states to 1824 states and 3528 transitions. [2021-11-21 00:40:19,508 INFO L78 Accepts]: Start accepts. Automaton has 1824 states and 3528 transitions. Word has length 43 [2021-11-21 00:40:19,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:40:19,509 INFO L470 AbstractCegarLoop]: Abstraction has 1824 states and 3528 transitions. [2021-11-21 00:40:19,509 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 4 states have internal predecessors, (33), 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) [2021-11-21 00:40:19,510 INFO L276 IsEmpty]: Start isEmpty. Operand 1824 states and 3528 transitions. [2021-11-21 00:40:19,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-21 00:40:19,526 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:40:19,527 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:40:19,528 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 00:40:19,528 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:40:19,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:40:19,531 INFO L85 PathProgramCache]: Analyzing trace with hash -277384990, now seen corresponding path program 1 times [2021-11-21 00:40:19,532 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:40:19,532 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [633208991] [2021-11-21 00:40:19,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:40:19,532 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:40:19,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:40:19,656 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 00:40:19,657 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:40:19,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [633208991] [2021-11-21 00:40:19,657 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [633208991] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:40:19,658 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [322337146] [2021-11-21 00:40:19,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:40:19,658 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:40:19,659 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:40:19,660 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:40:19,684 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 00:40:19,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:40:19,804 INFO L263 TraceCheckSpWp]: Trace formula consists of 492 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 00:40:19,812 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:40:20,049 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-21 00:40:20,052 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:40:20,057 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [322337146] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:40:20,058 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:40:20,058 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-21 00:40:20,059 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [796653758] [2021-11-21 00:40:20,059 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:40:20,060 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:40:20,060 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:40:20,061 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:40:20,061 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:40:20,061 INFO L87 Difference]: Start difference. First operand 1824 states and 3528 transitions. Second operand has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 2 states have internal predecessors, (50), 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) [2021-11-21 00:40:20,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:40:20,573 INFO L93 Difference]: Finished difference Result 2173 states and 4035 transitions. [2021-11-21 00:40:20,573 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:40:20,574 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 2 states have internal predecessors, (50), 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 80 [2021-11-21 00:40:20,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:40:20,599 INFO L225 Difference]: With dead ends: 2173 [2021-11-21 00:40:20,599 INFO L226 Difference]: Without dead ends: 1995 [2021-11-21 00:40:20,602 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:40:20,604 INFO L933 BasicCegarLoop]: 3207 mSDtfsCounter, 3384 mSDsluCounter, 124 mSDsCounter, 0 mSdLazyCounter, 268 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3384 SdHoareTripleChecker+Valid, 3312 SdHoareTripleChecker+Invalid, 270 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 268 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:40:20,605 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3384 Valid, 3312 Invalid, 270 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 268 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 00:40:20,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1995 states. [2021-11-21 00:40:20,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1995 to 1991. [2021-11-21 00:40:20,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1991 states, 1907 states have (on average 1.9113791295228106) internal successors, (3645), 1911 states have internal predecessors, (3645), 58 states have call successors, (58), 24 states have call predecessors, (58), 24 states have return successors, (58), 56 states have call predecessors, (58), 58 states have call successors, (58) [2021-11-21 00:40:20,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1991 states to 1991 states and 3761 transitions. [2021-11-21 00:40:20,734 INFO L78 Accepts]: Start accepts. Automaton has 1991 states and 3761 transitions. Word has length 80 [2021-11-21 00:40:20,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:40:20,735 INFO L470 AbstractCegarLoop]: Abstraction has 1991 states and 3761 transitions. [2021-11-21 00:40:20,735 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 2 states have internal predecessors, (50), 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) [2021-11-21 00:40:20,735 INFO L276 IsEmpty]: Start isEmpty. Operand 1991 states and 3761 transitions. [2021-11-21 00:40:20,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-21 00:40:20,740 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:40:20,741 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:40:20,788 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 00:40:20,956 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:40:20,956 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:40:20,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:40:20,958 INFO L85 PathProgramCache]: Analyzing trace with hash 242399426, now seen corresponding path program 1 times [2021-11-21 00:40:20,958 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:40:20,958 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2121553787] [2021-11-21 00:40:20,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:40:20,959 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:40:20,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:40:21,071 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 00:40:21,072 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:40:21,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2121553787] [2021-11-21 00:40:21,073 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2121553787] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:40:21,073 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [727912277] [2021-11-21 00:40:21,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:40:21,073 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:40:21,074 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:40:21,075 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:40:21,079 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 00:40:21,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:40:21,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 486 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 00:40:21,251 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:40:21,458 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 00:40:21,458 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:40:21,458 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [727912277] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:40:21,459 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:40:21,459 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-21 00:40:21,459 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [766385592] [2021-11-21 00:40:21,460 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:40:21,460 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:40:21,461 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:40:21,461 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:40:21,461 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:40:21,462 INFO L87 Difference]: Start difference. First operand 1991 states and 3761 transitions. Second operand has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 2 states have internal predecessors, (53), 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) [2021-11-21 00:40:22,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:40:22,088 INFO L93 Difference]: Finished difference Result 2668 states and 4736 transitions. [2021-11-21 00:40:22,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:40:22,089 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 2 states have internal predecessors, (53), 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 80 [2021-11-21 00:40:22,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:40:22,114 INFO L225 Difference]: With dead ends: 2668 [2021-11-21 00:40:22,115 INFO L226 Difference]: Without dead ends: 2323 [2021-11-21 00:40:22,118 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:40:22,123 INFO L933 BasicCegarLoop]: 3182 mSDtfsCounter, 3381 mSDsluCounter, 124 mSDsCounter, 0 mSdLazyCounter, 265 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3381 SdHoareTripleChecker+Valid, 3287 SdHoareTripleChecker+Invalid, 267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 265 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:40:22,125 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3381 Valid, 3287 Invalid, 267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 265 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 00:40:22,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2323 states. [2021-11-21 00:40:22,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2323 to 2317. [2021-11-21 00:40:22,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2317 states, 2159 states have (on average 1.8503937007874016) internal successors, (3995), 2165 states have internal predecessors, (3995), 108 states have call successors, (108), 48 states have call predecessors, (108), 48 states have return successors, (108), 104 states have call predecessors, (108), 108 states have call successors, (108) [2021-11-21 00:40:22,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2317 states to 2317 states and 4211 transitions. [2021-11-21 00:40:22,287 INFO L78 Accepts]: Start accepts. Automaton has 2317 states and 4211 transitions. Word has length 80 [2021-11-21 00:40:22,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:40:22,288 INFO L470 AbstractCegarLoop]: Abstraction has 2317 states and 4211 transitions. [2021-11-21 00:40:22,289 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 2 states have internal predecessors, (53), 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) [2021-11-21 00:40:22,289 INFO L276 IsEmpty]: Start isEmpty. Operand 2317 states and 4211 transitions. [2021-11-21 00:40:22,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-21 00:40:22,295 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:40:22,295 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:40:22,342 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 00:40:22,512 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:40:22,513 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:40:22,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:40:22,514 INFO L85 PathProgramCache]: Analyzing trace with hash 958364898, now seen corresponding path program 1 times [2021-11-21 00:40:22,514 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:40:22,514 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [637809701] [2021-11-21 00:40:22,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:40:22,515 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:40:22,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:40:22,683 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-21 00:40:22,684 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:40:22,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [637809701] [2021-11-21 00:40:22,685 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [637809701] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:40:22,685 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:40:22,685 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:40:22,686 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1622207340] [2021-11-21 00:40:22,686 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:40:22,692 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:40:22,692 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:40:22,695 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:40:22,695 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:40:22,695 INFO L87 Difference]: Start difference. First operand 2317 states and 4211 transitions. Second operand has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-21 00:40:23,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:40:23,274 INFO L93 Difference]: Finished difference Result 2839 states and 4960 transitions. [2021-11-21 00:40:23,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:40:23,275 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 80 [2021-11-21 00:40:23,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:40:23,300 INFO L225 Difference]: With dead ends: 2839 [2021-11-21 00:40:23,300 INFO L226 Difference]: Without dead ends: 2493 [2021-11-21 00:40:23,303 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:40:23,305 INFO L933 BasicCegarLoop]: 3228 mSDtfsCounter, 55 mSDsluCounter, 3406 mSDsCounter, 0 mSdLazyCounter, 488 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 6402 SdHoareTripleChecker+Invalid, 488 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 488 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:40:23,306 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 6402 Invalid, 488 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 488 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 00:40:23,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2493 states. [2021-11-21 00:40:23,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2493 to 2421. [2021-11-21 00:40:23,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2421 states, 2255 states have (on average 1.8425720620842572) internal successors, (4155), 2261 states have internal predecessors, (4155), 112 states have call successors, (112), 52 states have call predecessors, (112), 52 states have return successors, (112), 108 states have call predecessors, (112), 112 states have call successors, (112) [2021-11-21 00:40:23,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2421 states to 2421 states and 4379 transitions. [2021-11-21 00:40:23,457 INFO L78 Accepts]: Start accepts. Automaton has 2421 states and 4379 transitions. Word has length 80 [2021-11-21 00:40:23,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:40:23,458 INFO L470 AbstractCegarLoop]: Abstraction has 2421 states and 4379 transitions. [2021-11-21 00:40:23,458 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 2 states have call successors, (8), 1 states have call predecessors, (8), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-21 00:40:23,459 INFO L276 IsEmpty]: Start isEmpty. Operand 2421 states and 4379 transitions. [2021-11-21 00:40:23,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-11-21 00:40:23,465 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:40:23,466 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:40:23,466 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-21 00:40:23,467 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:40:23,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:40:23,467 INFO L85 PathProgramCache]: Analyzing trace with hash -753623407, now seen corresponding path program 1 times [2021-11-21 00:40:23,468 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:40:23,468 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [876258925] [2021-11-21 00:40:23,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:40:23,469 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:40:23,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:40:23,590 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2021-11-21 00:40:23,590 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:40:23,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [876258925] [2021-11-21 00:40:23,591 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [876258925] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:40:23,591 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:40:23,591 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:40:23,591 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [978361200] [2021-11-21 00:40:23,591 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:40:23,592 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:40:23,592 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:40:23,593 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:40:23,593 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:40:23,593 INFO L87 Difference]: Start difference. First operand 2421 states and 4379 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-21 00:40:24,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:40:24,294 INFO L93 Difference]: Finished difference Result 3934 states and 6568 transitions. [2021-11-21 00:40:24,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:40:24,295 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 106 [2021-11-21 00:40:24,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:40:24,322 INFO L225 Difference]: With dead ends: 3934 [2021-11-21 00:40:24,323 INFO L226 Difference]: Without dead ends: 3159 [2021-11-21 00:40:24,327 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:40:24,328 INFO L933 BasicCegarLoop]: 3189 mSDtfsCounter, 3375 mSDsluCounter, 124 mSDsCounter, 0 mSdLazyCounter, 263 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3375 SdHoareTripleChecker+Valid, 3294 SdHoareTripleChecker+Invalid, 265 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 263 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:40:24,330 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3375 Valid, 3294 Invalid, 265 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 263 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 00:40:24,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3159 states. [2021-11-21 00:40:24,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3159 to 3145. [2021-11-21 00:40:24,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3145 states, 2827 states have (on average 1.7541563494870889) internal successors, (4959), 2837 states have internal predecessors, (4959), 212 states have call successors, (212), 104 states have call predecessors, (212), 104 states have return successors, (212), 204 states have call predecessors, (212), 212 states have call successors, (212) [2021-11-21 00:40:24,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3145 states to 3145 states and 5383 transitions. [2021-11-21 00:40:24,509 INFO L78 Accepts]: Start accepts. Automaton has 3145 states and 5383 transitions. Word has length 106 [2021-11-21 00:40:24,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:40:24,513 INFO L470 AbstractCegarLoop]: Abstraction has 3145 states and 5383 transitions. [2021-11-21 00:40:24,513 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-21 00:40:24,513 INFO L276 IsEmpty]: Start isEmpty. Operand 3145 states and 5383 transitions. [2021-11-21 00:40:24,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2021-11-21 00:40:24,524 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:40:24,525 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:40:24,525 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-21 00:40:24,526 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:40:24,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:40:24,526 INFO L85 PathProgramCache]: Analyzing trace with hash -1766800247, now seen corresponding path program 1 times [2021-11-21 00:40:24,527 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:40:24,527 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [35813016] [2021-11-21 00:40:24,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:40:24,528 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:40:24,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:40:24,649 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 54 trivial. 0 not checked. [2021-11-21 00:40:24,650 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:40:24,650 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [35813016] [2021-11-21 00:40:24,651 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [35813016] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:40:24,651 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:40:24,651 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:40:24,651 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [911035814] [2021-11-21 00:40:24,651 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:40:24,653 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:40:24,653 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:40:24,653 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:40:24,654 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:40:24,655 INFO L87 Difference]: Start difference. First operand 3145 states and 5383 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-21 00:40:25,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:40:25,287 INFO L93 Difference]: Finished difference Result 6070 states and 9556 transitions. [2021-11-21 00:40:25,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:40:25,288 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 106 [2021-11-21 00:40:25,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:40:25,325 INFO L225 Difference]: With dead ends: 6070 [2021-11-21 00:40:25,325 INFO L226 Difference]: Without dead ends: 4571 [2021-11-21 00:40:25,333 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:40:25,334 INFO L933 BasicCegarLoop]: 3187 mSDtfsCounter, 3378 mSDsluCounter, 124 mSDsCounter, 0 mSdLazyCounter, 263 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3378 SdHoareTripleChecker+Valid, 3292 SdHoareTripleChecker+Invalid, 265 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 263 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:40:25,335 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3378 Valid, 3292 Invalid, 265 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 263 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 00:40:25,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4571 states. [2021-11-21 00:40:25,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4571 to 4545. [2021-11-21 00:40:25,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4545 states, 3931 states have (on average 1.6502162299669296) internal successors, (6487), 3949 states have internal predecessors, (6487), 404 states have call successors, (404), 208 states have call predecessors, (404), 208 states have return successors, (404), 388 states have call predecessors, (404), 404 states have call successors, (404) [2021-11-21 00:40:25,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4545 states to 4545 states and 7295 transitions. [2021-11-21 00:40:25,565 INFO L78 Accepts]: Start accepts. Automaton has 4545 states and 7295 transitions. Word has length 106 [2021-11-21 00:40:25,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:40:25,566 INFO L470 AbstractCegarLoop]: Abstraction has 4545 states and 7295 transitions. [2021-11-21 00:40:25,566 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (9), 1 states have call predecessors, (9), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-21 00:40:25,567 INFO L276 IsEmpty]: Start isEmpty. Operand 4545 states and 7295 transitions. [2021-11-21 00:40:25,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-11-21 00:40:25,581 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:40:25,582 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:40:25,582 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-21 00:40:25,582 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:40:25,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:40:25,583 INFO L85 PathProgramCache]: Analyzing trace with hash 1066053854, now seen corresponding path program 1 times [2021-11-21 00:40:25,583 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:40:25,583 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [784049670] [2021-11-21 00:40:25,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:40:25,584 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:40:25,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:40:25,662 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 22 proven. 2 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-21 00:40:25,662 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:40:25,665 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [784049670] [2021-11-21 00:40:25,665 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [784049670] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:40:25,665 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [711117735] [2021-11-21 00:40:25,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:40:25,666 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:40:25,666 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:40:25,681 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:40:25,688 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 00:40:25,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:40:25,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 636 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 00:40:25,837 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:40:26,134 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 63 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-21 00:40:26,134 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:40:26,135 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [711117735] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:40:26,135 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:40:26,135 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-21 00:40:26,135 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1512753932] [2021-11-21 00:40:26,136 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:40:26,136 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:40:26,136 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:40:26,137 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:40:26,138 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:40:26,138 INFO L87 Difference]: Start difference. First operand 4545 states and 7295 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-21 00:40:26,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:40:26,831 INFO L93 Difference]: Finished difference Result 6981 states and 10769 transitions. [2021-11-21 00:40:26,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:40:26,845 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 120 [2021-11-21 00:40:26,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:40:26,903 INFO L225 Difference]: With dead ends: 6981 [2021-11-21 00:40:26,904 INFO L226 Difference]: Without dead ends: 5495 [2021-11-21 00:40:26,912 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:40:26,916 INFO L933 BasicCegarLoop]: 3234 mSDtfsCounter, 68 mSDsluCounter, 3407 mSDsCounter, 0 mSdLazyCounter, 488 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 6410 SdHoareTripleChecker+Invalid, 488 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 488 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:40:26,917 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [68 Valid, 6410 Invalid, 488 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 488 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 00:40:26,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5495 states. [2021-11-21 00:40:27,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5495 to 5053. [2021-11-21 00:40:27,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5053 states, 4391 states have (on average 1.6467774994306537) internal successors, (7231), 4409 states have internal predecessors, (7231), 428 states have call successors, (428), 232 states have call predecessors, (428), 232 states have return successors, (428), 412 states have call predecessors, (428), 428 states have call successors, (428) [2021-11-21 00:40:27,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5053 states to 5053 states and 8087 transitions. [2021-11-21 00:40:27,230 INFO L78 Accepts]: Start accepts. Automaton has 5053 states and 8087 transitions. Word has length 120 [2021-11-21 00:40:27,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:40:27,231 INFO L470 AbstractCegarLoop]: Abstraction has 5053 states and 8087 transitions. [2021-11-21 00:40:27,232 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-21 00:40:27,232 INFO L276 IsEmpty]: Start isEmpty. Operand 5053 states and 8087 transitions. [2021-11-21 00:40:27,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-11-21 00:40:27,248 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:40:27,248 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:40:27,285 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 00:40:27,464 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:40:27,464 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:40:27,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:40:27,465 INFO L85 PathProgramCache]: Analyzing trace with hash 1815953682, now seen corresponding path program 1 times [2021-11-21 00:40:27,465 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:40:27,465 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [264420134] [2021-11-21 00:40:27,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:40:27,465 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:40:27,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:40:27,561 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 21 proven. 3 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-21 00:40:27,562 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:40:27,562 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [264420134] [2021-11-21 00:40:27,562 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [264420134] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:40:27,562 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [528481403] [2021-11-21 00:40:27,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:40:27,563 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:40:27,563 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:40:27,640 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:40:27,665 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 00:40:27,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:40:27,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 636 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 00:40:27,819 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:40:28,044 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 63 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-21 00:40:28,046 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:40:28,047 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [528481403] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:40:28,047 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:40:28,047 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-21 00:40:28,048 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1378907800] [2021-11-21 00:40:28,048 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:40:28,052 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:40:28,053 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:40:28,053 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:40:28,054 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:40:28,054 INFO L87 Difference]: Start difference. First operand 5053 states and 8087 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-21 00:40:28,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:40:28,718 INFO L93 Difference]: Finished difference Result 8017 states and 12365 transitions. [2021-11-21 00:40:28,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:40:28,718 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 120 [2021-11-21 00:40:28,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:40:28,769 INFO L225 Difference]: With dead ends: 8017 [2021-11-21 00:40:28,769 INFO L226 Difference]: Without dead ends: 6271 [2021-11-21 00:40:28,778 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:40:28,779 INFO L933 BasicCegarLoop]: 3247 mSDtfsCounter, 74 mSDsluCounter, 3407 mSDsCounter, 0 mSdLazyCounter, 489 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 6423 SdHoareTripleChecker+Invalid, 489 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 489 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:40:28,780 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 6423 Invalid, 489 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 489 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 00:40:28,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6271 states. [2021-11-21 00:40:29,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6271 to 5773. [2021-11-21 00:40:29,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5773 states, 5039 states have (on average 1.6398094860091288) internal successors, (8263), 5057 states have internal predecessors, (8263), 464 states have call successors, (464), 268 states have call predecessors, (464), 268 states have return successors, (464), 448 states have call predecessors, (464), 464 states have call successors, (464) [2021-11-21 00:40:29,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5773 states to 5773 states and 9191 transitions. [2021-11-21 00:40:29,090 INFO L78 Accepts]: Start accepts. Automaton has 5773 states and 9191 transitions. Word has length 120 [2021-11-21 00:40:29,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:40:29,091 INFO L470 AbstractCegarLoop]: Abstraction has 5773 states and 9191 transitions. [2021-11-21 00:40:29,091 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-21 00:40:29,092 INFO L276 IsEmpty]: Start isEmpty. Operand 5773 states and 9191 transitions. [2021-11-21 00:40:29,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-11-21 00:40:29,111 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:40:29,112 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-21 00:40:29,158 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 00:40:29,336 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-21 00:40:29,336 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:40:29,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:40:29,337 INFO L85 PathProgramCache]: Analyzing trace with hash -1097210021, now seen corresponding path program 1 times [2021-11-21 00:40:29,337 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:40:29,337 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [602536382] [2021-11-21 00:40:29,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:40:29,337 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:40:29,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:40:29,423 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 20 proven. 4 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-21 00:40:29,423 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:40:29,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [602536382] [2021-11-21 00:40:29,424 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [602536382] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:40:29,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [818213300] [2021-11-21 00:40:29,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:40:29,425 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:40:29,425 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:40:29,426 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:40:29,432 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 00:40:29,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:40:29,596 INFO L263 TraceCheckSpWp]: Trace formula consists of 633 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 00:40:29,599 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:40:29,903 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 65 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-21 00:40:29,903 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:40:29,904 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [818213300] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:40:29,904 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:40:29,904 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-21 00:40:29,904 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1535617915] [2021-11-21 00:40:29,905 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:40:29,905 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:40:29,905 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:40:29,906 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:40:29,906 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:40:29,907 INFO L87 Difference]: Start difference. First operand 5773 states and 9191 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-21 00:40:30,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:40:30,591 INFO L93 Difference]: Finished difference Result 9513 states and 14663 transitions. [2021-11-21 00:40:30,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:40:30,592 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 120 [2021-11-21 00:40:30,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:40:30,639 INFO L225 Difference]: With dead ends: 9513 [2021-11-21 00:40:30,639 INFO L226 Difference]: Without dead ends: 7371 [2021-11-21 00:40:30,649 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:40:30,651 INFO L933 BasicCegarLoop]: 3252 mSDtfsCounter, 80 mSDsluCounter, 3407 mSDsCounter, 0 mSdLazyCounter, 490 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 6428 SdHoareTripleChecker+Invalid, 490 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 490 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:40:30,652 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [80 Valid, 6428 Invalid, 490 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 490 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 00:40:30,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7371 states. [2021-11-21 00:40:30,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7371 to 6817. [2021-11-21 00:40:30,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6817 states, 5975 states have (on average 1.6299581589958159) internal successors, (9739), 5993 states have internal predecessors, (9739), 518 states have call successors, (518), 322 states have call predecessors, (518), 322 states have return successors, (518), 502 states have call predecessors, (518), 518 states have call successors, (518) [2021-11-21 00:40:30,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6817 states to 6817 states and 10775 transitions. [2021-11-21 00:40:30,986 INFO L78 Accepts]: Start accepts. Automaton has 6817 states and 10775 transitions. Word has length 120 [2021-11-21 00:40:30,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:40:30,987 INFO L470 AbstractCegarLoop]: Abstraction has 6817 states and 10775 transitions. [2021-11-21 00:40:30,988 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-21 00:40:30,988 INFO L276 IsEmpty]: Start isEmpty. Operand 6817 states and 10775 transitions. [2021-11-21 00:40:31,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-11-21 00:40:31,014 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:40:31,016 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-21 00:40:31,058 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 00:40:31,242 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-21 00:40:31,242 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:40:31,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:40:31,243 INFO L85 PathProgramCache]: Analyzing trace with hash -778782408, now seen corresponding path program 1 times [2021-11-21 00:40:31,243 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:40:31,243 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [835204616] [2021-11-21 00:40:31,243 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:40:31,243 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:40:31,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:40:31,340 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 23 proven. 1 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-21 00:40:31,340 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:40:31,340 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [835204616] [2021-11-21 00:40:31,341 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [835204616] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:40:31,341 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1488737753] [2021-11-21 00:40:31,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:40:31,341 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:40:31,342 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:40:31,342 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:40:31,360 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 00:40:31,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:40:31,503 INFO L263 TraceCheckSpWp]: Trace formula consists of 633 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 00:40:31,506 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:40:31,799 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 65 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-21 00:40:31,800 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:40:31,800 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1488737753] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:40:31,800 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:40:31,801 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-21 00:40:31,803 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [649987959] [2021-11-21 00:40:31,804 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:40:31,804 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:40:31,805 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:40:31,805 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:40:31,805 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:40:31,806 INFO L87 Difference]: Start difference. First operand 6817 states and 10775 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-21 00:40:32,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:40:32,573 INFO L93 Difference]: Finished difference Result 11379 states and 17534 transitions. [2021-11-21 00:40:32,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:40:32,574 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 120 [2021-11-21 00:40:32,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:40:32,610 INFO L225 Difference]: With dead ends: 11379 [2021-11-21 00:40:32,610 INFO L226 Difference]: Without dead ends: 8688 [2021-11-21 00:40:32,621 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-21 00:40:32,622 INFO L933 BasicCegarLoop]: 3237 mSDtfsCounter, 62 mSDsluCounter, 3407 mSDsCounter, 0 mSdLazyCounter, 487 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 6413 SdHoareTripleChecker+Invalid, 487 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 487 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:40:32,623 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [62 Valid, 6413 Invalid, 487 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 487 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 00:40:32,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8688 states. [2021-11-21 00:40:32,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8688 to 8302. [2021-11-21 00:40:32,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8302 states, 7298 states have (on average 1.6156481227733626) internal successors, (11791), 7316 states have internal predecessors, (11791), 599 states have call successors, (599), 403 states have call predecessors, (599), 403 states have return successors, (599), 583 states have call predecessors, (599), 599 states have call successors, (599) [2021-11-21 00:40:32,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8302 states to 8302 states and 12989 transitions. [2021-11-21 00:40:32,946 INFO L78 Accepts]: Start accepts. Automaton has 8302 states and 12989 transitions. Word has length 120 [2021-11-21 00:40:32,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:40:32,947 INFO L470 AbstractCegarLoop]: Abstraction has 8302 states and 12989 transitions. [2021-11-21 00:40:32,948 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-21 00:40:32,948 INFO L276 IsEmpty]: Start isEmpty. Operand 8302 states and 12989 transitions. [2021-11-21 00:40:32,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-11-21 00:40:32,974 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:40:32,974 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:40:33,017 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 00:40:33,196 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:40:33,196 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:40:33,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:40:33,197 INFO L85 PathProgramCache]: Analyzing trace with hash 486657535, now seen corresponding path program 2 times [2021-11-21 00:40:33,197 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:40:33,197 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [962240601] [2021-11-21 00:40:33,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:40:33,198 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:40:33,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:40:33,309 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 10 proven. 31 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-21 00:40:33,310 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:40:33,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [962240601] [2021-11-21 00:40:33,310 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [962240601] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:40:33,310 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1761535388] [2021-11-21 00:40:33,311 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:40:33,311 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:40:33,311 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:40:33,312 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:40:33,336 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 00:40:33,490 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 00:40:33,491 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:40:33,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 606 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-21 00:40:33,499 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:40:33,981 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 56 proven. 10 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-21 00:40:33,981 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:40:34,706 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 19 proven. 34 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-21 00:40:34,707 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1761535388] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:40:34,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1598728731] [2021-11-21 00:40:34,743 INFO L159 IcfgInterpreter]: Started Sifa with 63 locations of interest [2021-11-21 00:40:34,744 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:40:34,749 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:40:34,755 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:40:34,756 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:41:51,765 INFO L197 IcfgInterpreter]: Interpreting procedure reset_delta_events with input of size 143 for LOIs [2021-11-21 00:41:52,967 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 10 [2021-11-21 00:41:53,535 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 10 [2021-11-21 00:44:43,328 WARN L227 SmtUtils]: Spent 2.80m on a formula simplification that was a NOOP. DAG size: 1180 (called from [L 211] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.BasicPredicateFactory.xJunctTerm) [2021-11-21 00:47:30,865 WARN L227 SmtUtils]: Spent 2.79m on a formula simplification that was a NOOP. DAG size: 1180 (called from [L 211] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.BasicPredicateFactory.xJunctTerm) [2021-11-21 00:47:30,884 INFO L197 IcfgInterpreter]: Interpreting procedure fire_delta_events with input of size 143 for LOIs [2021-11-21 00:47:31,279 INFO L197 IcfgInterpreter]: Interpreting procedure update_channels with input of size 123 for LOIs [2021-11-21 00:47:31,554 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread with input of size 108 for LOIs [2021-11-21 00:47:31,980 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify with input of size 105 for LOIs [2021-11-21 00:47:33,809 INFO L197 IcfgInterpreter]: Interpreting procedure activate_threads with input of size 243 for LOIs [2021-11-21 00:48:55,974 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:49:58,613 WARN L227 SmtUtils]: Spent 40.00s on a formula simplification. DAG size of input: 1180 DAG size of output: 96 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-21 00:50:08,589 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1598728731] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:50:08,590 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:50:08,590 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [40] imperfect sequences [6, 7, 6] total 52 [2021-11-21 00:50:08,591 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1467673902] [2021-11-21 00:50:08,591 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:50:08,592 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-21 00:50:08,592 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:50:08,593 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-21 00:50:08,594 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=2240, Unknown=0, NotChecked=0, Total=2652 [2021-11-21 00:50:08,595 INFO L87 Difference]: Start difference. First operand 8302 states and 12989 transitions. Second operand has 41 states, 34 states have (on average 1.5588235294117647) internal successors, (53), 32 states have internal predecessors, (53), 7 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (8), 8 states have call predecessors, (8), 7 states have call successors, (8) [2021-11-21 00:52:09,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:52:09,577 INFO L93 Difference]: Finished difference Result 15676 states and 23722 transitions. [2021-11-21 00:52:09,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2021-11-21 00:52:09,578 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 34 states have (on average 1.5588235294117647) internal successors, (53), 32 states have internal predecessors, (53), 7 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (8), 8 states have call predecessors, (8), 7 states have call successors, (8) Word has length 120 [2021-11-21 00:52:09,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:52:09,607 INFO L225 Difference]: With dead ends: 15676 [2021-11-21 00:52:09,607 INFO L226 Difference]: Without dead ends: 9008 [2021-11-21 00:52:09,623 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 413 GetRequests, 313 SyntacticMatches, 3 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3061 ImplicationChecksByTransitivity, 109.5s TimeCoverageRelationStatistics Valid=1356, Invalid=8346, Unknown=0, NotChecked=0, Total=9702 [2021-11-21 00:52:09,624 INFO L933 BasicCegarLoop]: 3275 mSDtfsCounter, 498 mSDsluCounter, 2629 mSDsCounter, 0 mSdLazyCounter, 63421 mSolverCounterSat, 189 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 75.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 507 SdHoareTripleChecker+Valid, 5803 SdHoareTripleChecker+Invalid, 63610 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.2s SdHoareTripleChecker+Time, 189 IncrementalHoareTripleChecker+Valid, 63421 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 82.9s IncrementalHoareTripleChecker+Time [2021-11-21 00:52:09,625 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [507 Valid, 5803 Invalid, 63610 Unknown, 0 Unchecked, 0.2s Time], IncrementalHoareTripleChecker [189 Valid, 63421 Invalid, 0 Unknown, 0 Unchecked, 82.9s Time] [2021-11-21 00:52:09,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9008 states. [2021-11-21 00:52:10,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9008 to 8621. [2021-11-21 00:52:10,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8621 states, 7558 states have (on average 1.6047896268854194) internal successors, (12129), 7575 states have internal predecessors, (12129), 632 states have call successors, (632), 430 states have call predecessors, (632), 429 states have return successors, (634), 616 states have call predecessors, (634), 632 states have call successors, (634) [2021-11-21 00:52:10,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8621 states to 8621 states and 13395 transitions. [2021-11-21 00:52:10,050 INFO L78 Accepts]: Start accepts. Automaton has 8621 states and 13395 transitions. Word has length 120 [2021-11-21 00:52:10,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:52:10,050 INFO L470 AbstractCegarLoop]: Abstraction has 8621 states and 13395 transitions. [2021-11-21 00:52:10,051 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 34 states have (on average 1.5588235294117647) internal successors, (53), 32 states have internal predecessors, (53), 7 states have call successors, (8), 6 states have call predecessors, (8), 6 states have return successors, (8), 8 states have call predecessors, (8), 7 states have call successors, (8) [2021-11-21 00:52:10,051 INFO L276 IsEmpty]: Start isEmpty. Operand 8621 states and 13395 transitions. [2021-11-21 00:52:10,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-21 00:52:10,078 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:52:10,078 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-21 00:52:10,122 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 00:52:10,300 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-21 00:52:10,300 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:52:10,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:52:10,301 INFO L85 PathProgramCache]: Analyzing trace with hash -1177536533, now seen corresponding path program 1 times [2021-11-21 00:52:10,301 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:52:10,301 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1447845409] [2021-11-21 00:52:10,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:10,301 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:52:10,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:10,435 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 17 proven. 33 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-21 00:52:10,436 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:52:10,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1447845409] [2021-11-21 00:52:10,436 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1447845409] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:52:10,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2063916015] [2021-11-21 00:52:10,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:10,436 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:52:10,437 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:52:10,437 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:52:10,439 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 00:52:10,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:10,580 INFO L263 TraceCheckSpWp]: Trace formula consists of 640 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 00:52:10,584 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:52:10,782 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 70 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-21 00:52:10,782 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:52:10,782 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2063916015] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:52:10,782 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:52:10,782 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-21 00:52:10,782 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1068037324] [2021-11-21 00:52:10,783 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:52:10,783 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:52:10,783 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:52:10,784 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:52:10,784 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:52:10,784 INFO L87 Difference]: Start difference. First operand 8621 states and 13395 transitions. Second operand has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-21 00:52:11,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:52:11,401 INFO L93 Difference]: Finished difference Result 12815 states and 19689 transitions. [2021-11-21 00:52:11,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:52:11,403 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 121 [2021-11-21 00:52:11,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:52:11,432 INFO L225 Difference]: With dead ends: 12815 [2021-11-21 00:52:11,432 INFO L226 Difference]: Without dead ends: 8639 [2021-11-21 00:52:11,449 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:52:11,449 INFO L933 BasicCegarLoop]: 3236 mSDtfsCounter, 108 mSDsluCounter, 3396 mSDsCounter, 0 mSdLazyCounter, 491 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 6399 SdHoareTripleChecker+Invalid, 493 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 491 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:52:11,450 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [108 Valid, 6399 Invalid, 493 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 491 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 00:52:11,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8639 states. [2021-11-21 00:52:11,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8639 to 8491. [2021-11-21 00:52:11,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8491 states, 7428 states have (on average 1.5914108777598277) internal successors, (11821), 7445 states have internal predecessors, (11821), 632 states have call successors, (632), 430 states have call predecessors, (632), 429 states have return successors, (634), 616 states have call predecessors, (634), 632 states have call successors, (634) [2021-11-21 00:52:11,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8491 states to 8491 states and 13087 transitions. [2021-11-21 00:52:11,808 INFO L78 Accepts]: Start accepts. Automaton has 8491 states and 13087 transitions. Word has length 121 [2021-11-21 00:52:11,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:52:11,809 INFO L470 AbstractCegarLoop]: Abstraction has 8491 states and 13087 transitions. [2021-11-21 00:52:11,809 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-21 00:52:11,809 INFO L276 IsEmpty]: Start isEmpty. Operand 8491 states and 13087 transitions. [2021-11-21 00:52:11,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-21 00:52:11,832 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:52:11,833 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:52:11,872 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-21 00:52:12,048 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-21 00:52:12,048 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:52:12,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:52:12,049 INFO L85 PathProgramCache]: Analyzing trace with hash -1065180341, now seen corresponding path program 1 times [2021-11-21 00:52:12,049 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:52:12,049 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [973377178] [2021-11-21 00:52:12,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:12,049 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:52:12,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:12,147 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 17 proven. 31 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-21 00:52:12,147 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:52:12,147 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [973377178] [2021-11-21 00:52:12,147 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [973377178] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:52:12,148 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1237605928] [2021-11-21 00:52:12,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:12,148 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:52:12,148 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:52:12,149 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:52:12,172 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-21 00:52:12,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:12,298 INFO L263 TraceCheckSpWp]: Trace formula consists of 646 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-21 00:52:12,300 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:52:12,475 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 58 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-21 00:52:12,475 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:52:12,475 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1237605928] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:52:12,476 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:52:12,476 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-21 00:52:12,476 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [835583085] [2021-11-21 00:52:12,476 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:52:12,476 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:52:12,476 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:52:12,477 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:52:12,477 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:52:12,477 INFO L87 Difference]: Start difference. First operand 8491 states and 13087 transitions. Second operand has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-21 00:52:12,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:52:12,974 INFO L93 Difference]: Finished difference Result 12692 states and 19085 transitions. [2021-11-21 00:52:12,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:52:12,980 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 121 [2021-11-21 00:52:12,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:52:13,012 INFO L225 Difference]: With dead ends: 12692 [2021-11-21 00:52:13,012 INFO L226 Difference]: Without dead ends: 9188 [2021-11-21 00:52:13,023 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:52:13,025 INFO L933 BasicCegarLoop]: 3185 mSDtfsCounter, 3387 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 245 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3387 SdHoareTripleChecker+Valid, 3214 SdHoareTripleChecker+Invalid, 249 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 245 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:52:13,025 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3387 Valid, 3214 Invalid, 249 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 245 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 00:52:13,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9188 states. [2021-11-21 00:52:13,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9188 to 9188. [2021-11-21 00:52:13,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9188 states, 8034 states have (on average 1.5607418471496142) internal successors, (12539), 8051 states have internal predecessors, (12539), 662 states have call successors, (662), 491 states have call predecessors, (662), 490 states have return successors, (664), 646 states have call predecessors, (664), 662 states have call successors, (664) [2021-11-21 00:52:13,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9188 states to 9188 states and 13865 transitions. [2021-11-21 00:52:13,430 INFO L78 Accepts]: Start accepts. Automaton has 9188 states and 13865 transitions. Word has length 121 [2021-11-21 00:52:13,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:52:13,431 INFO L470 AbstractCegarLoop]: Abstraction has 9188 states and 13865 transitions. [2021-11-21 00:52:13,431 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 26.666666666666668) internal successors, (80), 3 states have internal predecessors, (80), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-21 00:52:13,431 INFO L276 IsEmpty]: Start isEmpty. Operand 9188 states and 13865 transitions. [2021-11-21 00:52:13,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2021-11-21 00:52:13,458 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:52:13,458 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:52:13,494 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-21 00:52:13,677 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-21 00:52:13,677 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:52:13,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:52:13,677 INFO L85 PathProgramCache]: Analyzing trace with hash 1277797512, now seen corresponding path program 1 times [2021-11-21 00:52:13,678 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:52:13,678 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [880887001] [2021-11-21 00:52:13,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:13,678 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:52:13,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:13,764 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 17 proven. 32 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-21 00:52:13,764 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:52:13,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [880887001] [2021-11-21 00:52:13,764 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [880887001] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:52:13,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [727801298] [2021-11-21 00:52:13,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:13,765 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:52:13,765 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:52:13,766 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:52:13,789 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-21 00:52:13,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:13,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 645 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-21 00:52:13,905 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:52:14,110 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 55 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-21 00:52:14,111 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:52:14,111 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [727801298] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:52:14,111 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:52:14,111 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 10 [2021-11-21 00:52:14,111 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [533425213] [2021-11-21 00:52:14,111 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:52:14,112 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:52:14,112 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:52:14,112 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:52:14,112 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2021-11-21 00:52:14,113 INFO L87 Difference]: Start difference. First operand 9188 states and 13865 transitions. Second operand has 6 states, 5 states have (on average 16.0) internal successors, (80), 6 states have internal predecessors, (80), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-21 00:52:15,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:52:15,021 INFO L93 Difference]: Finished difference Result 19335 states and 28052 transitions. [2021-11-21 00:52:15,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 00:52:15,021 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 16.0) internal successors, (80), 6 states have internal predecessors, (80), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 122 [2021-11-21 00:52:15,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:52:15,052 INFO L225 Difference]: With dead ends: 19335 [2021-11-21 00:52:15,052 INFO L226 Difference]: Without dead ends: 11847 [2021-11-21 00:52:15,071 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2021-11-21 00:52:15,072 INFO L933 BasicCegarLoop]: 3175 mSDtfsCounter, 3605 mSDsluCounter, 6770 mSDsCounter, 0 mSdLazyCounter, 797 mSolverCounterSat, 105 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3618 SdHoareTripleChecker+Valid, 9480 SdHoareTripleChecker+Invalid, 902 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 105 IncrementalHoareTripleChecker+Valid, 797 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 00:52:15,072 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3618 Valid, 9480 Invalid, 902 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [105 Valid, 797 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 00:52:15,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11847 states. [2021-11-21 00:52:15,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11847 to 11845. [2021-11-21 00:52:15,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11845 states, 10237 states have (on average 1.514506202989157) internal successors, (15504), 10262 states have internal predecessors, (15504), 925 states have call successors, (925), 682 states have call predecessors, (925), 681 states have return successors, (927), 901 states have call predecessors, (927), 925 states have call successors, (927) [2021-11-21 00:52:15,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11845 states to 11845 states and 17356 transitions. [2021-11-21 00:52:15,732 INFO L78 Accepts]: Start accepts. Automaton has 11845 states and 17356 transitions. Word has length 122 [2021-11-21 00:52:15,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:52:15,733 INFO L470 AbstractCegarLoop]: Abstraction has 11845 states and 17356 transitions. [2021-11-21 00:52:15,733 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 16.0) internal successors, (80), 6 states have internal predecessors, (80), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-21 00:52:15,733 INFO L276 IsEmpty]: Start isEmpty. Operand 11845 states and 17356 transitions. [2021-11-21 00:52:15,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-11-21 00:52:15,758 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:52:15,758 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:52:15,799 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-21 00:52:15,975 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-21 00:52:15,975 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:52:15,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:52:15,975 INFO L85 PathProgramCache]: Analyzing trace with hash 663977713, now seen corresponding path program 1 times [2021-11-21 00:52:15,975 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:52:15,976 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1155910331] [2021-11-21 00:52:15,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:15,976 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:52:15,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:16,054 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 14 proven. 32 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-21 00:52:16,055 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:52:16,055 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1155910331] [2021-11-21 00:52:16,055 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1155910331] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:52:16,055 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1878030564] [2021-11-21 00:52:16,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:16,056 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:52:16,056 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:52:16,057 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:52:16,078 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-21 00:52:16,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:16,201 INFO L263 TraceCheckSpWp]: Trace formula consists of 659 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 00:52:16,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:52:16,446 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 78 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-21 00:52:16,447 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:52:16,447 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1878030564] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:52:16,447 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:52:16,448 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-21 00:52:16,448 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1322005190] [2021-11-21 00:52:16,448 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:52:16,449 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:52:16,449 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:52:16,449 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:52:16,449 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:52:16,450 INFO L87 Difference]: Start difference. First operand 11845 states and 17356 transitions. Second operand has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-21 00:52:17,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:52:17,339 INFO L93 Difference]: Finished difference Result 18972 states and 27564 transitions. [2021-11-21 00:52:17,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:52:17,340 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 125 [2021-11-21 00:52:17,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:52:17,369 INFO L225 Difference]: With dead ends: 18972 [2021-11-21 00:52:17,369 INFO L226 Difference]: Without dead ends: 11863 [2021-11-21 00:52:17,388 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:52:17,388 INFO L933 BasicCegarLoop]: 3261 mSDtfsCounter, 101 mSDsluCounter, 3394 mSDsCounter, 0 mSdLazyCounter, 494 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 101 SdHoareTripleChecker+Valid, 6422 SdHoareTripleChecker+Invalid, 496 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 494 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 00:52:17,389 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [101 Valid, 6422 Invalid, 496 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 494 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 00:52:17,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11863 states. [2021-11-21 00:52:17,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11863 to 11715. [2021-11-21 00:52:17,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11715 states, 10107 states have (on average 1.4987632334025922) internal successors, (15148), 10132 states have internal predecessors, (15148), 925 states have call successors, (925), 682 states have call predecessors, (925), 681 states have return successors, (927), 901 states have call predecessors, (927), 925 states have call successors, (927) [2021-11-21 00:52:17,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11715 states to 11715 states and 17000 transitions. [2021-11-21 00:52:17,909 INFO L78 Accepts]: Start accepts. Automaton has 11715 states and 17000 transitions. Word has length 125 [2021-11-21 00:52:17,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:52:17,909 INFO L470 AbstractCegarLoop]: Abstraction has 11715 states and 17000 transitions. [2021-11-21 00:52:17,910 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.333333333333336) internal successors, (100), 3 states have internal predecessors, (100), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-21 00:52:17,910 INFO L276 IsEmpty]: Start isEmpty. Operand 11715 states and 17000 transitions. [2021-11-21 00:52:17,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2021-11-21 00:52:17,926 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:52:17,927 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:52:17,965 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-21 00:52:18,148 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-21 00:52:18,148 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:52:18,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:52:18,149 INFO L85 PathProgramCache]: Analyzing trace with hash 2103485137, now seen corresponding path program 1 times [2021-11-21 00:52:18,149 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:52:18,149 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2125167928] [2021-11-21 00:52:18,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:18,149 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:52:18,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:18,236 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 14 proven. 30 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2021-11-21 00:52:18,236 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:52:18,236 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2125167928] [2021-11-21 00:52:18,237 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2125167928] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:52:18,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1538590860] [2021-11-21 00:52:18,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:18,238 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:52:18,238 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:52:18,239 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:52:18,268 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-21 00:52:18,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:18,391 INFO L263 TraceCheckSpWp]: Trace formula consists of 665 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-21 00:52:18,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:52:18,589 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 68 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-21 00:52:18,590 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:52:18,590 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1538590860] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:52:18,590 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:52:18,590 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2021-11-21 00:52:18,590 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1040238515] [2021-11-21 00:52:18,591 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:52:18,592 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:52:18,592 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:52:18,593 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:52:18,593 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:52:18,593 INFO L87 Difference]: Start difference. First operand 11715 states and 17000 transitions. Second operand has 4 states, 4 states have (on average 23.5) internal successors, (94), 4 states have internal predecessors, (94), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2021-11-21 00:52:19,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:52:19,671 INFO L93 Difference]: Finished difference Result 29700 states and 41308 transitions. [2021-11-21 00:52:19,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 00:52:19,672 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 23.5) internal successors, (94), 4 states have internal predecessors, (94), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) Word has length 125 [2021-11-21 00:52:19,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:52:19,734 INFO L225 Difference]: With dead ends: 29700 [2021-11-21 00:52:19,734 INFO L226 Difference]: Without dead ends: 19685 [2021-11-21 00:52:19,759 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-11-21 00:52:19,760 INFO L933 BasicCegarLoop]: 3254 mSDtfsCounter, 3399 mSDsluCounter, 3619 mSDsCounter, 0 mSdLazyCounter, 528 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3399 SdHoareTripleChecker+Valid, 6611 SdHoareTripleChecker+Invalid, 531 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 528 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:52:19,761 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3399 Valid, 6611 Invalid, 531 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 528 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 00:52:19,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19685 states. [2021-11-21 00:52:20,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19685 to 19658. [2021-11-21 00:52:20,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19658 states, 16672 states have (on average 1.4337212092130518) internal successors, (23903), 16744 states have internal predecessors, (23903), 1710 states have call successors, (1710), 1252 states have call predecessors, (1710), 1274 states have return successors, (1786), 1662 states have call predecessors, (1786), 1710 states have call successors, (1786) [2021-11-21 00:52:20,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19658 states to 19658 states and 27399 transitions. [2021-11-21 00:52:20,711 INFO L78 Accepts]: Start accepts. Automaton has 19658 states and 27399 transitions. Word has length 125 [2021-11-21 00:52:20,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:52:20,711 INFO L470 AbstractCegarLoop]: Abstraction has 19658 states and 27399 transitions. [2021-11-21 00:52:20,712 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 23.5) internal successors, (94), 4 states have internal predecessors, (94), 2 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2021-11-21 00:52:20,712 INFO L276 IsEmpty]: Start isEmpty. Operand 19658 states and 27399 transitions. [2021-11-21 00:52:20,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-21 00:52:20,736 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:52:20,736 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:52:20,776 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-21 00:52:20,964 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-21 00:52:20,964 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:52:20,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:52:20,965 INFO L85 PathProgramCache]: Analyzing trace with hash -1213222492, now seen corresponding path program 1 times [2021-11-21 00:52:20,965 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:52:20,965 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1769263458] [2021-11-21 00:52:20,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:20,965 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:52:20,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:21,060 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 14 proven. 31 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-21 00:52:21,060 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:52:21,061 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1769263458] [2021-11-21 00:52:21,061 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1769263458] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:52:21,061 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [51367343] [2021-11-21 00:52:21,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:21,061 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:52:21,062 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:52:21,063 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:52:21,083 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-21 00:52:21,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:21,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 664 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 00:52:21,205 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:52:21,437 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 61 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-21 00:52:21,438 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:52:21,438 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [51367343] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:52:21,438 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:52:21,438 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-21 00:52:21,439 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1137981003] [2021-11-21 00:52:21,439 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:52:21,439 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:52:21,440 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:52:21,440 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:52:21,440 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:52:21,441 INFO L87 Difference]: Start difference. First operand 19658 states and 27399 transitions. Second operand has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-21 00:52:22,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:52:22,262 INFO L93 Difference]: Finished difference Result 24006 states and 33398 transitions. [2021-11-21 00:52:22,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:52:22,262 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 126 [2021-11-21 00:52:22,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:52:22,299 INFO L225 Difference]: With dead ends: 24006 [2021-11-21 00:52:22,300 INFO L226 Difference]: Without dead ends: 18330 [2021-11-21 00:52:22,312 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:52:22,313 INFO L933 BasicCegarLoop]: 3185 mSDtfsCounter, 28 mSDsluCounter, 3397 mSDsCounter, 0 mSdLazyCounter, 479 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 6351 SdHoareTripleChecker+Invalid, 479 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 479 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:52:22,313 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 6351 Invalid, 479 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 479 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 00:52:22,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18330 states. [2021-11-21 00:52:23,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18330 to 18054. [2021-11-21 00:52:23,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18054 states, 15260 states have (on average 1.4432503276539974) internal successors, (22024), 15296 states have internal predecessors, (22024), 1626 states have call successors, (1626), 1168 states have call predecessors, (1626), 1166 states have return successors, (1630), 1590 states have call predecessors, (1630), 1626 states have call successors, (1630) [2021-11-21 00:52:23,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18054 states to 18054 states and 25280 transitions. [2021-11-21 00:52:23,189 INFO L78 Accepts]: Start accepts. Automaton has 18054 states and 25280 transitions. Word has length 126 [2021-11-21 00:52:23,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:52:23,190 INFO L470 AbstractCegarLoop]: Abstraction has 18054 states and 25280 transitions. [2021-11-21 00:52:23,190 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.0) internal successors, (87), 3 states have internal predecessors, (87), 3 states have call successors, (10), 3 states have call predecessors, (10), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-21 00:52:23,190 INFO L276 IsEmpty]: Start isEmpty. Operand 18054 states and 25280 transitions. [2021-11-21 00:52:23,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-11-21 00:52:23,206 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:52:23,207 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:52:23,249 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-21 00:52:23,420 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:52:23,420 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:52:23,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:52:23,421 INFO L85 PathProgramCache]: Analyzing trace with hash 189582901, now seen corresponding path program 1 times [2021-11-21 00:52:23,421 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:52:23,421 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1928295421] [2021-11-21 00:52:23,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:23,421 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:52:23,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:23,515 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 18 proven. 34 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-21 00:52:23,516 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:52:23,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1928295421] [2021-11-21 00:52:23,516 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1928295421] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:52:23,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1871709740] [2021-11-21 00:52:23,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:23,517 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:52:23,517 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:52:23,518 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:52:23,536 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-21 00:52:23,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:23,664 INFO L263 TraceCheckSpWp]: Trace formula consists of 683 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 00:52:23,667 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:52:23,936 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 71 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-21 00:52:23,936 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:52:23,936 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1871709740] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:52:23,937 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:52:23,937 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-21 00:52:23,937 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1903876901] [2021-11-21 00:52:23,937 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:52:23,937 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:52:23,938 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:52:23,938 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:52:23,938 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:52:23,938 INFO L87 Difference]: Start difference. First operand 18054 states and 25280 transitions. Second operand has 3 states, 3 states have (on average 33.0) internal successors, (99), 3 states have internal predecessors, (99), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-21 00:52:24,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:52:24,910 INFO L93 Difference]: Finished difference Result 30770 states and 42463 transitions. [2021-11-21 00:52:24,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:52:24,911 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.0) internal successors, (99), 3 states have internal predecessors, (99), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 128 [2021-11-21 00:52:24,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:52:24,961 INFO L225 Difference]: With dead ends: 30770 [2021-11-21 00:52:24,961 INFO L226 Difference]: Without dead ends: 20192 [2021-11-21 00:52:24,978 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:52:24,979 INFO L933 BasicCegarLoop]: 3192 mSDtfsCounter, 3356 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 251 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3356 SdHoareTripleChecker+Valid, 3228 SdHoareTripleChecker+Invalid, 255 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 251 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:52:24,980 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3356 Valid, 3228 Invalid, 255 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 251 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 00:52:24,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20192 states. [2021-11-21 00:52:25,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20192 to 20020. [2021-11-21 00:52:25,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20020 states, 17056 states have (on average 1.4078330206378986) internal successors, (24012), 17092 states have internal predecessors, (24012), 1662 states have call successors, (1662), 1302 states have call predecessors, (1662), 1300 states have return successors, (1788), 1626 states have call predecessors, (1788), 1662 states have call successors, (1788) [2021-11-21 00:52:25,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20020 states to 20020 states and 27462 transitions. [2021-11-21 00:52:25,788 INFO L78 Accepts]: Start accepts. Automaton has 20020 states and 27462 transitions. Word has length 128 [2021-11-21 00:52:25,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:52:25,788 INFO L470 AbstractCegarLoop]: Abstraction has 20020 states and 27462 transitions. [2021-11-21 00:52:25,789 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.0) internal successors, (99), 3 states have internal predecessors, (99), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-21 00:52:25,789 INFO L276 IsEmpty]: Start isEmpty. Operand 20020 states and 27462 transitions. [2021-11-21 00:52:25,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-21 00:52:25,814 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:52:25,814 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:52:25,860 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-21 00:52:26,028 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-21 00:52:26,028 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:52:26,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:52:26,029 INFO L85 PathProgramCache]: Analyzing trace with hash 1430297027, now seen corresponding path program 1 times [2021-11-21 00:52:26,029 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:52:26,029 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [697564245] [2021-11-21 00:52:26,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:26,029 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:52:26,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:26,141 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 18 proven. 36 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-21 00:52:26,141 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:52:26,141 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [697564245] [2021-11-21 00:52:26,141 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [697564245] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:52:26,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1380658581] [2021-11-21 00:52:26,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:26,142 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:52:26,142 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:52:26,143 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:52:26,163 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-21 00:52:26,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:26,302 INFO L263 TraceCheckSpWp]: Trace formula consists of 681 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-21 00:52:26,305 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:52:26,633 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 86 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:52:26,634 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:52:26,634 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1380658581] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:52:26,634 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:52:26,634 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 10 [2021-11-21 00:52:26,634 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1303431472] [2021-11-21 00:52:26,635 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:52:26,635 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:52:26,635 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:52:26,636 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:52:26,636 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-11-21 00:52:26,636 INFO L87 Difference]: Start difference. First operand 20020 states and 27462 transitions. Second operand has 6 states, 6 states have (on average 18.0) internal successors, (108), 6 states have internal predecessors, (108), 5 states have call successors, (11), 5 states have call predecessors, (11), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2021-11-21 00:52:28,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:52:28,418 INFO L93 Difference]: Finished difference Result 36842 states and 49861 transitions. [2021-11-21 00:52:28,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 00:52:28,419 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 18.0) internal successors, (108), 6 states have internal predecessors, (108), 5 states have call successors, (11), 5 states have call predecessors, (11), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) Word has length 130 [2021-11-21 00:52:28,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:52:28,473 INFO L225 Difference]: With dead ends: 36842 [2021-11-21 00:52:28,473 INFO L226 Difference]: Without dead ends: 24970 [2021-11-21 00:52:28,491 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2021-11-21 00:52:28,492 INFO L933 BasicCegarLoop]: 3251 mSDtfsCounter, 222 mSDsluCounter, 13468 mSDsCounter, 0 mSdLazyCounter, 1347 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 238 SdHoareTripleChecker+Valid, 15800 SdHoareTripleChecker+Invalid, 1405 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 1347 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-21 00:52:28,492 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [238 Valid, 15800 Invalid, 1405 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 1347 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-21 00:52:28,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24970 states. [2021-11-21 00:52:29,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24970 to 23216. [2021-11-21 00:52:29,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23216 states, 19638 states have (on average 1.3823199918525308) internal successors, (27146), 19654 states have internal predecessors, (27146), 2042 states have call successors, (2042), 1578 states have call predecessors, (2042), 1534 states have return successors, (2232), 1984 states have call predecessors, (2232), 2042 states have call successors, (2232) [2021-11-21 00:52:29,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23216 states to 23216 states and 31420 transitions. [2021-11-21 00:52:29,387 INFO L78 Accepts]: Start accepts. Automaton has 23216 states and 31420 transitions. Word has length 130 [2021-11-21 00:52:29,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:52:29,388 INFO L470 AbstractCegarLoop]: Abstraction has 23216 states and 31420 transitions. [2021-11-21 00:52:29,388 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 18.0) internal successors, (108), 6 states have internal predecessors, (108), 5 states have call successors, (11), 5 states have call predecessors, (11), 5 states have return successors, (11), 5 states have call predecessors, (11), 5 states have call successors, (11) [2021-11-21 00:52:29,388 INFO L276 IsEmpty]: Start isEmpty. Operand 23216 states and 31420 transitions. [2021-11-21 00:52:29,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2021-11-21 00:52:29,404 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:52:29,405 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:52:29,430 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-21 00:52:29,605 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:52:29,605 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:52:29,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:52:29,606 INFO L85 PathProgramCache]: Analyzing trace with hash 889050178, now seen corresponding path program 1 times [2021-11-21 00:52:29,606 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:52:29,606 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [871906638] [2021-11-21 00:52:29,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:29,607 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:52:29,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:29,683 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 17 proven. 32 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2021-11-21 00:52:29,684 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:52:29,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [871906638] [2021-11-21 00:52:29,684 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [871906638] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:52:29,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1532661649] [2021-11-21 00:52:29,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:29,685 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:52:29,685 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:52:29,686 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:52:29,688 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-21 00:52:29,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:29,833 INFO L263 TraceCheckSpWp]: Trace formula consists of 659 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-21 00:52:29,836 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:52:30,133 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 53 proven. 0 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-21 00:52:30,133 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:52:30,133 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1532661649] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:52:30,133 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:52:30,133 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 7 [2021-11-21 00:52:30,134 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1037576401] [2021-11-21 00:52:30,134 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:52:30,134 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 00:52:30,134 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:52:30,135 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 00:52:30,135 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:52:30,135 INFO L87 Difference]: Start difference. First operand 23216 states and 31420 transitions. Second operand has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-21 00:52:31,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:52:31,938 INFO L93 Difference]: Finished difference Result 53444 states and 70638 transitions. [2021-11-21 00:52:31,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 00:52:31,938 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 124 [2021-11-21 00:52:31,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:52:32,006 INFO L225 Difference]: With dead ends: 53444 [2021-11-21 00:52:32,006 INFO L226 Difference]: Without dead ends: 31973 [2021-11-21 00:52:32,044 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 126 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-11-21 00:52:32,045 INFO L933 BasicCegarLoop]: 3181 mSDtfsCounter, 6950 mSDsluCounter, 6708 mSDsCounter, 0 mSdLazyCounter, 757 mSolverCounterSat, 139 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6963 SdHoareTripleChecker+Valid, 9435 SdHoareTripleChecker+Invalid, 896 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 139 IncrementalHoareTripleChecker+Valid, 757 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 00:52:32,045 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6963 Valid, 9435 Invalid, 896 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [139 Valid, 757 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 00:52:32,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31973 states. [2021-11-21 00:52:33,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31973 to 31959. [2021-11-21 00:52:33,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31959 states, 26847 states have (on average 1.3449174954371066) internal successors, (36107), 26871 states have internal predecessors, (36107), 2916 states have call successors, (2916), 2256 states have call predecessors, (2916), 2194 states have return successors, (3196), 2832 states have call predecessors, (3196), 2916 states have call successors, (3196) [2021-11-21 00:52:33,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31959 states to 31959 states and 42219 transitions. [2021-11-21 00:52:33,336 INFO L78 Accepts]: Start accepts. Automaton has 31959 states and 42219 transitions. Word has length 124 [2021-11-21 00:52:33,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:52:33,336 INFO L470 AbstractCegarLoop]: Abstraction has 31959 states and 42219 transitions. [2021-11-21 00:52:33,337 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 13.166666666666666) internal successors, (79), 6 states have internal predecessors, (79), 3 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-21 00:52:33,337 INFO L276 IsEmpty]: Start isEmpty. Operand 31959 states and 42219 transitions. [2021-11-21 00:52:33,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-11-21 00:52:33,359 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:52:33,360 INFO L514 BasicCegarLoop]: trace histogram [5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:52:33,386 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-21 00:52:33,562 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:52:33,562 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:52:33,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:52:33,563 INFO L85 PathProgramCache]: Analyzing trace with hash 837561093, now seen corresponding path program 1 times [2021-11-21 00:52:33,563 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:52:33,563 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1600804590] [2021-11-21 00:52:33,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:33,563 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:52:33,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:33,847 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 12 proven. 32 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-21 00:52:33,847 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:52:33,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1600804590] [2021-11-21 00:52:33,848 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1600804590] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:52:33,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1720088818] [2021-11-21 00:52:33,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:52:33,848 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:52:33,848 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:52:33,849 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:52:33,850 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bcb400af-0cbc-4a1d-9a70-c92e5cf6b643/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-21 00:52:34,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:52:34,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 735 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-21 00:52:34,030 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:52:34,385 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 68 proven. 17 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-21 00:52:34,385 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:52:34,978 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 17 proven. 3 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2021-11-21 00:52:34,978 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1720088818] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:52:34,978 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1941177926] [2021-11-21 00:52:34,983 INFO L159 IcfgInterpreter]: Started Sifa with 71 locations of interest [2021-11-21 00:52:34,983 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:52:34,984 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:52:34,984 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:52:34,984 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs