./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/fibo_2calls_15-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/fibo_2calls_15-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 532954920d93df80ec8903cd7069d46bd3e41c8f10c6c2a8e6416a137735480b --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:09:04,403 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:09:04,404 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:09:04,448 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:09:04,448 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:09:04,454 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:09:04,456 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:09:04,459 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:09:04,462 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:09:04,466 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:09:04,467 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:09:04,472 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:09:04,472 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:09:04,482 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:09:04,486 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:09:04,492 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:09:04,494 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:09:04,497 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:09:04,500 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:09:04,508 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:09:04,514 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:09:04,516 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:09:04,518 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:09:04,520 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:09:04,528 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:09:04,529 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:09:04,529 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:09:04,531 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:09:04,532 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:09:04,534 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:09:04,536 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:09:04,536 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:09:04,537 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:09:04,538 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:09:04,540 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:09:04,540 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:09:04,541 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:09:04,541 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:09:04,541 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:09:04,542 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:09:04,543 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:09:04,544 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 02:09:04,574 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:09:04,574 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:09:04,574 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:09:04,575 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:09:04,576 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:09:04,576 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:09:04,576 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:09:04,577 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:09:04,577 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:09:04,577 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:09:04,578 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:09:04,578 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:09:04,578 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:09:04,578 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:09:04,579 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:09:04,579 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:09:04,579 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:09:04,580 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:09:04,581 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:09:04,581 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:09:04,581 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:09:04,582 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:09:04,582 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:09:04,582 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:09:04,582 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:09:04,583 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:09:04,583 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:09:04,583 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:09:04,584 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:09:04,584 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:09:04,584 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:09:04,584 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:09:04,585 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:09:04,585 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:09:04,585 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:09:04,586 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:09:04,586 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:09:04,586 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:09:04,586 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:09:04,587 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:09:04,587 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:09:04,587 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_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 532954920d93df80ec8903cd7069d46bd3e41c8f10c6c2a8e6416a137735480b [2021-11-23 02:09:04,862 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:09:04,887 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:09:04,890 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:09:04,891 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:09:04,892 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:09:04,894 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/recursive-simple/fibo_2calls_15-1.c [2021-11-23 02:09:04,965 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/data/31a9b456e/1bf1e5c35a1c49dd97ed230c64e550f1/FLAGda4fb55e7 [2021-11-23 02:09:05,561 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:09:05,562 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/sv-benchmarks/c/recursive-simple/fibo_2calls_15-1.c [2021-11-23 02:09:05,574 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/data/31a9b456e/1bf1e5c35a1c49dd97ed230c64e550f1/FLAGda4fb55e7 [2021-11-23 02:09:05,903 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/data/31a9b456e/1bf1e5c35a1c49dd97ed230c64e550f1 [2021-11-23 02:09:05,906 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:09:05,910 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:09:05,912 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:09:05,936 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:09:05,939 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:09:05,940 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:09:05" (1/1) ... [2021-11-23 02:09:05,941 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@66ff0e18 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:09:05, skipping insertion in model container [2021-11-23 02:09:05,941 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:09:05" (1/1) ... [2021-11-23 02:09:05,952 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:09:05,964 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:09:06,158 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_e5c783bf-4155-49fd-a3ba-ba51fee21e74/sv-benchmarks/c/recursive-simple/fibo_2calls_15-1.c[950,963] [2021-11-23 02:09:06,162 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:09:06,173 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:09:06,194 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_e5c783bf-4155-49fd-a3ba-ba51fee21e74/sv-benchmarks/c/recursive-simple/fibo_2calls_15-1.c[950,963] [2021-11-23 02:09:06,195 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:09:06,211 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:09:06,211 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:09:06 WrapperNode [2021-11-23 02:09:06,212 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:09:06,213 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:09:06,214 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:09:06,214 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:09:06,223 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:09:06" (1/1) ... [2021-11-23 02:09:06,230 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:09:06" (1/1) ... [2021-11-23 02:09:06,247 INFO L137 Inliner]: procedures = 14, calls = 12, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 21 [2021-11-23 02:09:06,248 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:09:06,249 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:09:06,249 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:09:06,249 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:09:06,257 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:09:06" (1/1) ... [2021-11-23 02:09:06,258 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:09:06" (1/1) ... [2021-11-23 02:09:06,259 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:09:06" (1/1) ... [2021-11-23 02:09:06,260 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:09:06" (1/1) ... [2021-11-23 02:09:06,263 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:09:06" (1/1) ... [2021-11-23 02:09:06,265 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:09:06" (1/1) ... [2021-11-23 02:09:06,266 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:09:06" (1/1) ... [2021-11-23 02:09:06,268 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:09:06,269 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:09:06,269 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:09:06,269 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:09:06,270 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:09:06" (1/1) ... [2021-11-23 02:09:06,283 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:09:06,295 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:09:06,310 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:09:06,320 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:09:06,362 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:09:06,362 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:09:06,363 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2021-11-23 02:09:06,363 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2021-11-23 02:09:06,363 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2021-11-23 02:09:06,363 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2021-11-23 02:09:06,364 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:09:06,364 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:09:06,424 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:09:06,426 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:09:06,542 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:09:06,557 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:09:06,557 INFO L301 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-23 02:09:06,560 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:09:06 BoogieIcfgContainer [2021-11-23 02:09:06,560 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:09:06,562 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:09:06,563 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:09:06,567 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:09:06,567 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:09:05" (1/3) ... [2021-11-23 02:09:06,568 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@766d277f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:09:06, skipping insertion in model container [2021-11-23 02:09:06,568 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:09:06" (2/3) ... [2021-11-23 02:09:06,568 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@766d277f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:09:06, skipping insertion in model container [2021-11-23 02:09:06,569 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:09:06" (3/3) ... [2021-11-23 02:09:06,570 INFO L111 eAbstractionObserver]: Analyzing ICFG fibo_2calls_15-1.c [2021-11-23 02:09:06,576 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:09:06,576 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 02:09:06,663 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:09:06,671 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 02:09:06,672 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 02:09:06,690 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-23 02:09:06,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-23 02:09:06,696 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:06,697 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:09:06,697 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:06,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:06,703 INFO L85 PathProgramCache]: Analyzing trace with hash 2097990987, now seen corresponding path program 1 times [2021-11-23 02:09:06,714 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:09:06,715 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [379462917] [2021-11-23 02:09:06,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:06,716 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:09:06,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:06,906 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:09:06,906 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:09:06,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [379462917] [2021-11-23 02:09:06,907 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [379462917] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:09:06,908 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:09:06,908 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:09:06,910 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1476873268] [2021-11-23 02:09:06,911 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:09:06,915 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:09:06,916 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:09:06,945 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:09:06,946 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:09:06,948 INFO L87 Difference]: Start difference. First operand has 26 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 02:09:07,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:07,011 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2021-11-23 02:09:07,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:09:07,013 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2021-11-23 02:09:07,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:07,023 INFO L225 Difference]: With dead ends: 36 [2021-11-23 02:09:07,024 INFO L226 Difference]: Without dead ends: 26 [2021-11-23 02:09:07,027 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:09:07,032 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 2 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:07,034 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 108 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:09:07,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-11-23 02:09:07,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-11-23 02:09:07,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-23 02:09:07,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2021-11-23 02:09:07,097 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 9 [2021-11-23 02:09:07,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:07,097 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2021-11-23 02:09:07,098 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 02:09:07,098 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2021-11-23 02:09:07,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-23 02:09:07,100 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:07,100 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:09:07,100 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:09:07,101 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:07,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:07,102 INFO L85 PathProgramCache]: Analyzing trace with hash 1328370967, now seen corresponding path program 1 times [2021-11-23 02:09:07,102 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:09:07,103 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [792180685] [2021-11-23 02:09:07,103 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:07,104 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:09:07,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:07,156 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:09:07,156 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:09:07,156 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [792180685] [2021-11-23 02:09:07,157 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [792180685] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:09:07,157 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:09:07,157 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 02:09:07,158 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1398701423] [2021-11-23 02:09:07,158 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:09:07,159 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 02:09:07,160 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:09:07,160 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 02:09:07,161 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:09:07,161 INFO L87 Difference]: Start difference. First operand 26 states and 33 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 02:09:07,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:07,184 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2021-11-23 02:09:07,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:09:07,185 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2021-11-23 02:09:07,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:07,187 INFO L225 Difference]: With dead ends: 32 [2021-11-23 02:09:07,187 INFO L226 Difference]: Without dead ends: 28 [2021-11-23 02:09:07,188 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:09:07,190 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 0 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:07,191 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 119 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:09:07,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-23 02:09:07,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2021-11-23 02:09:07,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-23 02:09:07,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2021-11-23 02:09:07,201 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 10 [2021-11-23 02:09:07,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:07,201 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2021-11-23 02:09:07,201 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 02:09:07,202 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2021-11-23 02:09:07,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-23 02:09:07,203 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:07,204 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:09:07,204 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 02:09:07,204 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:07,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:07,206 INFO L85 PathProgramCache]: Analyzing trace with hash -1296553538, now seen corresponding path program 1 times [2021-11-23 02:09:07,206 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:09:07,206 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1032848266] [2021-11-23 02:09:07,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:07,207 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:09:07,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:07,333 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:09:07,333 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:09:07,334 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1032848266] [2021-11-23 02:09:07,334 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1032848266] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:09:07,334 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [991322549] [2021-11-23 02:09:07,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:07,335 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:09:07,348 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:09:07,376 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:09:07,380 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:09:07,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:07,452 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:09:07,458 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:07,661 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:09:07,662 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:07,966 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:09:07,967 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [991322549] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:09:07,970 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [858131611] [2021-11-23 02:09:07,998 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-23 02:09:07,998 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:09:08,015 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:09:08,021 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:09:08,022 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:09:08,183 INFO L197 IcfgInterpreter]: Interpreting procedure fibo1 with input of size 39 for LOIs [2021-11-23 02:09:08,258 INFO L197 IcfgInterpreter]: Interpreting procedure fibo2 with input of size 39 for LOIs [2021-11-23 02:09:08,269 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:09:08,599 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [858131611] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:09:08,600 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:09:08,600 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6, 7, 7] total 17 [2021-11-23 02:09:08,601 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1416228361] [2021-11-23 02:09:08,601 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:09:08,601 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:09:08,601 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:09:08,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:09:08,603 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2021-11-23 02:09:08,603 INFO L87 Difference]: Start difference. First operand 26 states and 33 transitions. Second operand has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 4 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-23 02:09:08,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:08,768 INFO L93 Difference]: Finished difference Result 68 states and 91 transitions. [2021-11-23 02:09:08,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 02:09:08,769 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 4 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 3 states have call successors, (3) Word has length 22 [2021-11-23 02:09:08,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:08,776 INFO L225 Difference]: With dead ends: 68 [2021-11-23 02:09:08,777 INFO L226 Difference]: Without dead ends: 44 [2021-11-23 02:09:08,779 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 51 SyntacticMatches, 5 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2021-11-23 02:09:08,783 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 18 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 110 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:08,785 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 110 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:09:08,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-11-23 02:09:08,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2021-11-23 02:09:08,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 28 states have (on average 1.1428571428571428) internal successors, (32), 28 states have internal predecessors, (32), 9 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-11-23 02:09:08,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2021-11-23 02:09:08,800 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 22 [2021-11-23 02:09:08,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:08,801 INFO L470 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2021-11-23 02:09:08,801 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 4 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-23 02:09:08,801 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2021-11-23 02:09:08,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-23 02:09:08,804 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:08,804 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:09:08,832 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:09:09,023 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:09:09,024 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:09,024 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:09,025 INFO L85 PathProgramCache]: Analyzing trace with hash -28918515, now seen corresponding path program 1 times [2021-11-23 02:09:09,025 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:09:09,025 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1358123413] [2021-11-23 02:09:09,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:09,026 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:09:09,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:09,093 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:09:09,094 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:09:09,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1358123413] [2021-11-23 02:09:09,094 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1358123413] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:09:09,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1679957905] [2021-11-23 02:09:09,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:09,095 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:09:09,095 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:09:09,096 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:09:09,126 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:09:09,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:09,153 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 02:09:09,155 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:09,267 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-23 02:09:09,267 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:09,653 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:09:09,653 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1679957905] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:09:09,655 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2004143841] [2021-11-23 02:09:09,669 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 02:09:09,675 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:09:09,676 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 02:09:09,679 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:09:09,679 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 9] total 14 [2021-11-23 02:09:09,679 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2047406649] [2021-11-23 02:09:09,680 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:09:09,680 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-23 02:09:09,681 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:09:09,681 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-23 02:09:09,681 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-11-23 02:09:09,682 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand has 14 states, 11 states have (on average 4.0) internal successors, (44), 14 states have internal predecessors, (44), 11 states have call successors, (13), 1 states have call predecessors, (13), 5 states have return successors, (13), 3 states have call predecessors, (13), 11 states have call successors, (13) [2021-11-23 02:09:09,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:09,907 INFO L93 Difference]: Finished difference Result 85 states and 121 transitions. [2021-11-23 02:09:09,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 02:09:09,908 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 11 states have (on average 4.0) internal successors, (44), 14 states have internal predecessors, (44), 11 states have call successors, (13), 1 states have call predecessors, (13), 5 states have return successors, (13), 3 states have call predecessors, (13), 11 states have call successors, (13) Word has length 35 [2021-11-23 02:09:09,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:09,910 INFO L225 Difference]: With dead ends: 85 [2021-11-23 02:09:09,910 INFO L226 Difference]: Without dead ends: 53 [2021-11-23 02:09:09,911 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 62 SyntacticMatches, 4 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=75, Invalid=305, Unknown=0, NotChecked=0, Total=380 [2021-11-23 02:09:09,912 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 39 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 161 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 189 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 161 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:09,913 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 119 Invalid, 189 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 161 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:09:09,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-11-23 02:09:09,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 44. [2021-11-23 02:09:09,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 29 states have (on average 1.1379310344827587) internal successors, (33), 30 states have internal predecessors, (33), 9 states have call successors, (9), 4 states have call predecessors, (9), 5 states have return successors, (11), 9 states have call predecessors, (11), 9 states have call successors, (11) [2021-11-23 02:09:09,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 53 transitions. [2021-11-23 02:09:09,927 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 53 transitions. Word has length 35 [2021-11-23 02:09:09,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:09,927 INFO L470 AbstractCegarLoop]: Abstraction has 44 states and 53 transitions. [2021-11-23 02:09:09,928 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 11 states have (on average 4.0) internal successors, (44), 14 states have internal predecessors, (44), 11 states have call successors, (13), 1 states have call predecessors, (13), 5 states have return successors, (13), 3 states have call predecessors, (13), 11 states have call successors, (13) [2021-11-23 02:09:09,928 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 53 transitions. [2021-11-23 02:09:09,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-23 02:09:09,930 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:09,930 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:09:09,970 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 02:09:10,144 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:09:10,145 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:10,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:10,145 INFO L85 PathProgramCache]: Analyzing trace with hash -243412115, now seen corresponding path program 1 times [2021-11-23 02:09:10,145 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:09:10,146 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [758003206] [2021-11-23 02:09:10,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:10,146 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:09:10,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:10,262 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:09:10,262 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:09:10,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [758003206] [2021-11-23 02:09:10,263 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [758003206] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:09:10,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [788952732] [2021-11-23 02:09:10,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:10,263 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:09:10,263 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:09:10,264 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:09:10,290 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:09:10,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:10,331 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 02:09:10,334 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:10,465 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:09:10,465 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:10,818 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 02:09:10,818 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [788952732] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:09:10,818 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1814308870] [2021-11-23 02:09:10,821 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 02:09:10,822 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:09:10,822 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 02:09:10,824 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:09:10,824 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 9] total 18 [2021-11-23 02:09:10,824 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1667458825] [2021-11-23 02:09:10,825 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:09:10,825 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-23 02:09:10,826 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:09:10,826 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-23 02:09:10,826 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2021-11-23 02:09:10,827 INFO L87 Difference]: Start difference. First operand 44 states and 53 transitions. Second operand has 18 states, 16 states have (on average 3.0625) internal successors, (49), 18 states have internal predecessors, (49), 11 states have call successors, (13), 1 states have call predecessors, (13), 7 states have return successors, (13), 6 states have call predecessors, (13), 11 states have call successors, (13) [2021-11-23 02:09:11,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:11,376 INFO L93 Difference]: Finished difference Result 121 states and 203 transitions. [2021-11-23 02:09:11,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-23 02:09:11,376 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 16 states have (on average 3.0625) internal successors, (49), 18 states have internal predecessors, (49), 11 states have call successors, (13), 1 states have call predecessors, (13), 7 states have return successors, (13), 6 states have call predecessors, (13), 11 states have call successors, (13) Word has length 36 [2021-11-23 02:09:11,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:11,379 INFO L225 Difference]: With dead ends: 121 [2021-11-23 02:09:11,379 INFO L226 Difference]: Without dead ends: 77 [2021-11-23 02:09:11,382 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=142, Invalid=670, Unknown=0, NotChecked=0, Total=812 [2021-11-23 02:09:11,383 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 72 mSDsluCounter, 231 mSDsCounter, 0 mSdLazyCounter, 439 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 250 SdHoareTripleChecker+Invalid, 532 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 439 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:11,383 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [76 Valid, 250 Invalid, 532 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 439 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:09:11,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2021-11-23 02:09:11,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 63. [2021-11-23 02:09:11,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 40 states have (on average 1.15) internal successors, (46), 43 states have internal predecessors, (46), 14 states have call successors, (14), 5 states have call predecessors, (14), 8 states have return successors, (31), 14 states have call predecessors, (31), 14 states have call successors, (31) [2021-11-23 02:09:11,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 91 transitions. [2021-11-23 02:09:11,404 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 91 transitions. Word has length 36 [2021-11-23 02:09:11,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:11,405 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 91 transitions. [2021-11-23 02:09:11,405 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 16 states have (on average 3.0625) internal successors, (49), 18 states have internal predecessors, (49), 11 states have call successors, (13), 1 states have call predecessors, (13), 7 states have return successors, (13), 6 states have call predecessors, (13), 11 states have call successors, (13) [2021-11-23 02:09:11,405 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 91 transitions. [2021-11-23 02:09:11,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-23 02:09:11,412 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:11,412 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 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] [2021-11-23 02:09:11,450 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-11-23 02:09:11,640 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:09:11,641 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:11,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:11,641 INFO L85 PathProgramCache]: Analyzing trace with hash 403750738, now seen corresponding path program 1 times [2021-11-23 02:09:11,641 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:09:11,641 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [530926156] [2021-11-23 02:09:11,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:11,641 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:09:11,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:11,780 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 02:09:11,780 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:09:11,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [530926156] [2021-11-23 02:09:11,780 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [530926156] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:09:11,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1754509034] [2021-11-23 02:09:11,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:11,782 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:09:11,782 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:09:11,792 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:09:11,794 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 02:09:11,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:11,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 02:09:11,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:11,979 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-23 02:09:11,979 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:12,529 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 02:09:12,530 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1754509034] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:09:12,530 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [272157143] [2021-11-23 02:09:12,536 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 02:09:12,536 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:09:12,537 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 02:09:12,538 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:09:12,538 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 11] total 17 [2021-11-23 02:09:12,539 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [85429873] [2021-11-23 02:09:12,539 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:09:12,541 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-23 02:09:12,541 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:09:12,542 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-23 02:09:12,542 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2021-11-23 02:09:12,543 INFO L87 Difference]: Start difference. First operand 63 states and 91 transitions. Second operand has 17 states, 15 states have (on average 3.6) internal successors, (54), 17 states have internal predecessors, (54), 12 states have call successors, (14), 1 states have call predecessors, (14), 8 states have return successors, (18), 8 states have call predecessors, (18), 12 states have call successors, (18) [2021-11-23 02:09:12,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:12,796 INFO L93 Difference]: Finished difference Result 119 states and 203 transitions. [2021-11-23 02:09:12,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 02:09:12,797 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 15 states have (on average 3.6) internal successors, (54), 17 states have internal predecessors, (54), 12 states have call successors, (14), 1 states have call predecessors, (14), 8 states have return successors, (18), 8 states have call predecessors, (18), 12 states have call successors, (18) Word has length 50 [2021-11-23 02:09:12,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:12,799 INFO L225 Difference]: With dead ends: 119 [2021-11-23 02:09:12,799 INFO L226 Difference]: Without dead ends: 97 [2021-11-23 02:09:12,800 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=115, Invalid=437, Unknown=0, NotChecked=0, Total=552 [2021-11-23 02:09:12,802 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 58 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 157 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 225 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:12,802 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [71 Valid, 117 Invalid, 225 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 157 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:09:12,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-11-23 02:09:12,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 72. [2021-11-23 02:09:12,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 46 states have (on average 1.1304347826086956) internal successors, (52), 49 states have internal predecessors, (52), 14 states have call successors, (14), 5 states have call predecessors, (14), 11 states have return successors, (39), 17 states have call predecessors, (39), 14 states have call successors, (39) [2021-11-23 02:09:12,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 105 transitions. [2021-11-23 02:09:12,823 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 105 transitions. Word has length 50 [2021-11-23 02:09:12,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:12,823 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 105 transitions. [2021-11-23 02:09:12,824 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 15 states have (on average 3.6) internal successors, (54), 17 states have internal predecessors, (54), 12 states have call successors, (14), 1 states have call predecessors, (14), 8 states have return successors, (18), 8 states have call predecessors, (18), 12 states have call successors, (18) [2021-11-23 02:09:12,824 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 105 transitions. [2021-11-23 02:09:12,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-23 02:09:12,829 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:12,829 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:09:12,862 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 02:09:13,048 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:09:13,049 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:13,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:13,049 INFO L85 PathProgramCache]: Analyzing trace with hash 1766289300, now seen corresponding path program 1 times [2021-11-23 02:09:13,049 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:09:13,049 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1293141157] [2021-11-23 02:09:13,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:13,050 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:09:13,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:13,198 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 39 proven. 42 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2021-11-23 02:09:13,198 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:09:13,198 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1293141157] [2021-11-23 02:09:13,198 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1293141157] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:09:13,198 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1703071265] [2021-11-23 02:09:13,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:13,199 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:09:13,199 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:09:13,204 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:09:13,221 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 02:09:13,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:13,273 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 02:09:13,277 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:13,513 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 12 proven. 71 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2021-11-23 02:09:13,514 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:14,429 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 12 proven. 81 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-11-23 02:09:14,429 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1703071265] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:09:14,430 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [952940055] [2021-11-23 02:09:14,432 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 02:09:14,433 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:09:14,433 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 02:09:14,434 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:09:14,435 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 13] total 23 [2021-11-23 02:09:14,435 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [54686427] [2021-11-23 02:09:14,435 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:09:14,436 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-23 02:09:14,437 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:09:14,437 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-23 02:09:14,438 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2021-11-23 02:09:14,438 INFO L87 Difference]: Start difference. First operand 72 states and 105 transitions. Second operand has 23 states, 21 states have (on average 3.4285714285714284) internal successors, (72), 23 states have internal predecessors, (72), 18 states have call successors, (22), 1 states have call predecessors, (22), 9 states have return successors, (25), 10 states have call predecessors, (25), 18 states have call successors, (25) [2021-11-23 02:09:15,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:15,366 INFO L93 Difference]: Finished difference Result 204 states and 411 transitions. [2021-11-23 02:09:15,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-23 02:09:15,367 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 21 states have (on average 3.4285714285714284) internal successors, (72), 23 states have internal predecessors, (72), 18 states have call successors, (22), 1 states have call predecessors, (22), 9 states have return successors, (25), 10 states have call predecessors, (25), 18 states have call successors, (25) Word has length 79 [2021-11-23 02:09:15,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:15,370 INFO L225 Difference]: With dead ends: 204 [2021-11-23 02:09:15,371 INFO L226 Difference]: Without dead ends: 115 [2021-11-23 02:09:15,373 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 152 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 210 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=263, Invalid=1297, Unknown=0, NotChecked=0, Total=1560 [2021-11-23 02:09:15,374 INFO L933 BasicCegarLoop]: 35 mSDtfsCounter, 138 mSDsluCounter, 333 mSDsCounter, 0 mSdLazyCounter, 679 mSolverCounterSat, 164 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 355 SdHoareTripleChecker+Invalid, 843 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 164 IncrementalHoareTripleChecker+Valid, 679 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:15,375 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [139 Valid, 355 Invalid, 843 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [164 Valid, 679 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 02:09:15,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2021-11-23 02:09:15,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 98. [2021-11-23 02:09:15,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 64 states have (on average 1.171875) internal successors, (75), 66 states have internal predecessors, (75), 19 states have call successors, (19), 8 states have call predecessors, (19), 14 states have return successors, (50), 23 states have call predecessors, (50), 19 states have call successors, (50) [2021-11-23 02:09:15,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 144 transitions. [2021-11-23 02:09:15,396 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 144 transitions. Word has length 79 [2021-11-23 02:09:15,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:15,397 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 144 transitions. [2021-11-23 02:09:15,397 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 21 states have (on average 3.4285714285714284) internal successors, (72), 23 states have internal predecessors, (72), 18 states have call successors, (22), 1 states have call predecessors, (22), 9 states have return successors, (25), 10 states have call predecessors, (25), 18 states have call successors, (25) [2021-11-23 02:09:15,397 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 144 transitions. [2021-11-23 02:09:15,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-23 02:09:15,405 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:15,405 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 7, 6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2021-11-23 02:09:15,434 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 02:09:15,620 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:09:15,621 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:15,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:15,621 INFO L85 PathProgramCache]: Analyzing trace with hash -346616466, now seen corresponding path program 1 times [2021-11-23 02:09:15,621 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:09:15,621 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1679458374] [2021-11-23 02:09:15,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:15,622 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:09:15,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:15,756 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 39 proven. 92 refuted. 0 times theorem prover too weak. 293 trivial. 0 not checked. [2021-11-23 02:09:15,757 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:09:15,758 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1679458374] [2021-11-23 02:09:15,758 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1679458374] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:09:15,758 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1203648542] [2021-11-23 02:09:15,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:15,759 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:09:15,759 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:09:15,760 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:09:15,762 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 02:09:15,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:15,851 INFO L263 TraceCheckSpWp]: Trace formula consists of 315 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 02:09:15,856 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:16,195 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 29 proven. 172 refuted. 0 times theorem prover too weak. 223 trivial. 0 not checked. [2021-11-23 02:09:16,195 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:17,819 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 29 proven. 186 refuted. 0 times theorem prover too weak. 209 trivial. 0 not checked. [2021-11-23 02:09:17,819 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1203648542] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:09:17,819 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1734252755] [2021-11-23 02:09:17,823 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 02:09:17,823 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:09:17,824 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 02:09:17,825 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:09:17,825 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 11, 15] total 20 [2021-11-23 02:09:17,826 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [691742233] [2021-11-23 02:09:17,826 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:09:17,827 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-23 02:09:17,828 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:09:17,828 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-23 02:09:17,829 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2021-11-23 02:09:17,829 INFO L87 Difference]: Start difference. First operand 98 states and 144 transitions. Second operand has 20 states, 17 states have (on average 4.117647058823529) internal successors, (70), 20 states have internal predecessors, (70), 17 states have call successors, (22), 1 states have call predecessors, (22), 8 states have return successors, (27), 7 states have call predecessors, (27), 17 states have call successors, (27) [2021-11-23 02:09:18,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:18,218 INFO L93 Difference]: Finished difference Result 191 states and 315 transitions. [2021-11-23 02:09:18,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 02:09:18,219 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 17 states have (on average 4.117647058823529) internal successors, (70), 20 states have internal predecessors, (70), 17 states have call successors, (22), 1 states have call predecessors, (22), 8 states have return successors, (27), 7 states have call predecessors, (27), 17 states have call successors, (27) Word has length 130 [2021-11-23 02:09:18,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:18,224 INFO L225 Difference]: With dead ends: 191 [2021-11-23 02:09:18,225 INFO L226 Difference]: Without dead ends: 103 [2021-11-23 02:09:18,226 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 274 GetRequests, 240 SyntacticMatches, 7 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 139 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=152, Invalid=660, Unknown=0, NotChecked=0, Total=812 [2021-11-23 02:09:18,228 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 86 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 284 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 183 SdHoareTripleChecker+Invalid, 349 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 284 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:18,228 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [93 Valid, 183 Invalid, 349 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 284 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:09:18,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2021-11-23 02:09:18,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 100. [2021-11-23 02:09:18,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 65 states have (on average 1.1692307692307693) internal successors, (76), 68 states have internal predecessors, (76), 19 states have call successors, (19), 8 states have call predecessors, (19), 15 states have return successors, (48), 23 states have call predecessors, (48), 19 states have call successors, (48) [2021-11-23 02:09:18,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 143 transitions. [2021-11-23 02:09:18,269 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 143 transitions. Word has length 130 [2021-11-23 02:09:18,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:18,270 INFO L470 AbstractCegarLoop]: Abstraction has 100 states and 143 transitions. [2021-11-23 02:09:18,270 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 17 states have (on average 4.117647058823529) internal successors, (70), 20 states have internal predecessors, (70), 17 states have call successors, (22), 1 states have call predecessors, (22), 8 states have return successors, (27), 7 states have call predecessors, (27), 17 states have call successors, (27) [2021-11-23 02:09:18,270 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 143 transitions. [2021-11-23 02:09:18,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-11-23 02:09:18,273 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:18,274 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 7, 6, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:09:18,330 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 02:09:18,516 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:09:18,517 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:18,517 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:18,517 INFO L85 PathProgramCache]: Analyzing trace with hash 2089532945, now seen corresponding path program 2 times [2021-11-23 02:09:18,517 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:09:18,517 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [64401863] [2021-11-23 02:09:18,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:18,518 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:09:18,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:18,712 INFO L134 CoverageAnalysis]: Checked inductivity of 352 backedges. 37 proven. 111 refuted. 0 times theorem prover too weak. 204 trivial. 0 not checked. [2021-11-23 02:09:18,712 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:09:18,712 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [64401863] [2021-11-23 02:09:18,712 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [64401863] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:09:18,712 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2131508174] [2021-11-23 02:09:18,713 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:09:18,713 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:09:18,713 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:09:18,717 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:09:18,739 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 02:09:18,809 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 02:09:18,809 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:09:18,810 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 02:09:18,814 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:19,059 INFO L134 CoverageAnalysis]: Checked inductivity of 352 backedges. 77 proven. 20 refuted. 0 times theorem prover too weak. 255 trivial. 0 not checked. [2021-11-23 02:09:19,059 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:19,675 INFO L134 CoverageAnalysis]: Checked inductivity of 352 backedges. 77 proven. 22 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2021-11-23 02:09:19,675 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2131508174] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:09:19,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [461392463] [2021-11-23 02:09:19,678 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 02:09:19,678 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:09:19,679 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 02:09:19,679 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:09:19,679 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 9] total 16 [2021-11-23 02:09:19,680 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1043243853] [2021-11-23 02:09:19,680 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:09:19,681 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 02:09:19,681 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:09:19,681 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 02:09:19,682 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=190, Unknown=0, NotChecked=0, Total=240 [2021-11-23 02:09:19,682 INFO L87 Difference]: Start difference. First operand 100 states and 143 transitions. Second operand has 16 states, 14 states have (on average 4.071428571428571) internal successors, (57), 16 states have internal predecessors, (57), 10 states have call successors, (17), 1 states have call predecessors, (17), 8 states have return successors, (21), 11 states have call predecessors, (21), 10 states have call successors, (21) [2021-11-23 02:09:19,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:19,940 INFO L93 Difference]: Finished difference Result 132 states and 213 transitions. [2021-11-23 02:09:19,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 02:09:19,941 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 14 states have (on average 4.071428571428571) internal successors, (57), 16 states have internal predecessors, (57), 10 states have call successors, (17), 1 states have call predecessors, (17), 8 states have return successors, (21), 11 states have call predecessors, (21), 10 states have call successors, (21) Word has length 118 [2021-11-23 02:09:19,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:19,944 INFO L225 Difference]: With dead ends: 132 [2021-11-23 02:09:19,944 INFO L226 Difference]: Without dead ends: 118 [2021-11-23 02:09:19,945 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 233 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=107, Invalid=399, Unknown=0, NotChecked=0, Total=506 [2021-11-23 02:09:19,946 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 29 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 239 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 165 SdHoareTripleChecker+Invalid, 267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 239 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:19,947 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 165 Invalid, 267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 239 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:09:19,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2021-11-23 02:09:19,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 108. [2021-11-23 02:09:19,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 70 states have (on average 1.1571428571428573) internal successors, (81), 73 states have internal predecessors, (81), 20 states have call successors, (20), 8 states have call predecessors, (20), 17 states have return successors, (59), 26 states have call predecessors, (59), 20 states have call successors, (59) [2021-11-23 02:09:19,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 160 transitions. [2021-11-23 02:09:19,969 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 160 transitions. Word has length 118 [2021-11-23 02:09:19,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:19,970 INFO L470 AbstractCegarLoop]: Abstraction has 108 states and 160 transitions. [2021-11-23 02:09:19,970 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 14 states have (on average 4.071428571428571) internal successors, (57), 16 states have internal predecessors, (57), 10 states have call successors, (17), 1 states have call predecessors, (17), 8 states have return successors, (21), 11 states have call predecessors, (21), 10 states have call successors, (21) [2021-11-23 02:09:19,970 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 160 transitions. [2021-11-23 02:09:19,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2021-11-23 02:09:19,975 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:19,975 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 12, 10, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 3, 3, 2, 1, 1, 1, 1, 1, 1] [2021-11-23 02:09:20,024 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 02:09:20,192 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-23 02:09:20,192 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:20,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:20,193 INFO L85 PathProgramCache]: Analyzing trace with hash 1687293718, now seen corresponding path program 3 times [2021-11-23 02:09:20,193 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:09:20,193 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1112116440] [2021-11-23 02:09:20,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:20,193 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:09:20,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:20,418 INFO L134 CoverageAnalysis]: Checked inductivity of 931 backedges. 76 proven. 209 refuted. 0 times theorem prover too weak. 646 trivial. 0 not checked. [2021-11-23 02:09:20,419 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:09:20,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1112116440] [2021-11-23 02:09:20,419 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1112116440] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:09:20,419 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1459522760] [2021-11-23 02:09:20,419 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:09:20,420 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:09:20,420 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:09:20,421 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:09:20,444 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 02:09:20,539 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:09:20,539 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:09:20,541 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 02:09:20,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:20,928 INFO L134 CoverageAnalysis]: Checked inductivity of 931 backedges. 423 proven. 19 refuted. 0 times theorem prover too weak. 489 trivial. 0 not checked. [2021-11-23 02:09:20,929 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:22,054 INFO L134 CoverageAnalysis]: Checked inductivity of 931 backedges. 74 proven. 251 refuted. 0 times theorem prover too weak. 606 trivial. 0 not checked. [2021-11-23 02:09:22,055 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1459522760] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:09:22,055 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [755196854] [2021-11-23 02:09:22,059 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 02:09:22,059 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:09:22,060 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 02:09:22,060 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:09:22,061 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 11] total 17 [2021-11-23 02:09:22,061 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1400795715] [2021-11-23 02:09:22,061 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:09:22,065 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-23 02:09:22,065 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:09:22,066 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-23 02:09:22,066 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-11-23 02:09:22,066 INFO L87 Difference]: Start difference. First operand 108 states and 160 transitions. Second operand has 17 states, 17 states have (on average 4.176470588235294) internal successors, (71), 17 states have internal predecessors, (71), 10 states have call successors, (20), 2 states have call predecessors, (20), 6 states have return successors, (23), 6 states have call predecessors, (23), 10 states have call successors, (23) [2021-11-23 02:09:22,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:22,308 INFO L93 Difference]: Finished difference Result 213 states and 337 transitions. [2021-11-23 02:09:22,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 02:09:22,309 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 4.176470588235294) internal successors, (71), 17 states have internal predecessors, (71), 10 states have call successors, (20), 2 states have call predecessors, (20), 6 states have return successors, (23), 6 states have call predecessors, (23), 10 states have call successors, (23) Word has length 187 [2021-11-23 02:09:22,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:22,312 INFO L225 Difference]: With dead ends: 213 [2021-11-23 02:09:22,312 INFO L226 Difference]: Without dead ends: 113 [2021-11-23 02:09:22,313 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 390 GetRequests, 366 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=115, Invalid=437, Unknown=0, NotChecked=0, Total=552 [2021-11-23 02:09:22,314 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 43 mSDsluCounter, 165 mSDsCounter, 0 mSdLazyCounter, 206 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 181 SdHoareTripleChecker+Invalid, 235 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 206 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:22,315 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 181 Invalid, 235 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 206 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:09:22,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-11-23 02:09:22,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 113. [2021-11-23 02:09:22,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 74 states have (on average 1.1216216216216217) internal successors, (83), 76 states have internal predecessors, (83), 20 states have call successors, (20), 9 states have call predecessors, (20), 18 states have return successors, (59), 27 states have call predecessors, (59), 20 states have call successors, (59) [2021-11-23 02:09:22,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 162 transitions. [2021-11-23 02:09:22,330 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 162 transitions. Word has length 187 [2021-11-23 02:09:22,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:22,331 INFO L470 AbstractCegarLoop]: Abstraction has 113 states and 162 transitions. [2021-11-23 02:09:22,331 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 4.176470588235294) internal successors, (71), 17 states have internal predecessors, (71), 10 states have call successors, (20), 2 states have call predecessors, (20), 6 states have return successors, (23), 6 states have call predecessors, (23), 10 states have call successors, (23) [2021-11-23 02:09:22,332 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 162 transitions. [2021-11-23 02:09:22,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2021-11-23 02:09:22,339 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:22,339 INFO L514 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 10, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 1, 1, 1, 1, 1, 1] [2021-11-23 02:09:22,384 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 02:09:22,572 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-23 02:09:22,572 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:22,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:22,573 INFO L85 PathProgramCache]: Analyzing trace with hash 317371732, now seen corresponding path program 1 times [2021-11-23 02:09:22,573 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:09:22,573 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [497042366] [2021-11-23 02:09:22,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:22,573 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:09:22,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:22,702 INFO L134 CoverageAnalysis]: Checked inductivity of 943 backedges. 45 proven. 299 refuted. 0 times theorem prover too weak. 599 trivial. 0 not checked. [2021-11-23 02:09:22,702 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:09:22,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [497042366] [2021-11-23 02:09:22,703 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [497042366] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:09:22,703 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1696709428] [2021-11-23 02:09:22,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:22,703 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:09:22,703 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:09:22,704 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:09:22,706 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 02:09:22,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:22,823 INFO L263 TraceCheckSpWp]: Trace formula consists of 443 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 02:09:22,847 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:23,197 INFO L134 CoverageAnalysis]: Checked inductivity of 943 backedges. 45 proven. 299 refuted. 0 times theorem prover too weak. 599 trivial. 0 not checked. [2021-11-23 02:09:23,198 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:24,679 INFO L134 CoverageAnalysis]: Checked inductivity of 943 backedges. 45 proven. 315 refuted. 0 times theorem prover too weak. 583 trivial. 0 not checked. [2021-11-23 02:09:24,679 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1696709428] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:09:24,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [781680900] [2021-11-23 02:09:24,682 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 02:09:24,682 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:09:24,682 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 02:09:24,684 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:09:24,684 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 15] total 18 [2021-11-23 02:09:24,684 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1797517210] [2021-11-23 02:09:24,684 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:09:24,685 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-23 02:09:24,686 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:09:24,686 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-23 02:09:24,686 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-11-23 02:09:24,687 INFO L87 Difference]: Start difference. First operand 113 states and 162 transitions. Second operand has 18 states, 16 states have (on average 3.8125) internal successors, (61), 18 states have internal predecessors, (61), 15 states have call successors, (18), 1 states have call predecessors, (18), 7 states have return successors, (21), 7 states have call predecessors, (21), 15 states have call successors, (21) [2021-11-23 02:09:24,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:24,896 INFO L93 Difference]: Finished difference Result 142 states and 227 transitions. [2021-11-23 02:09:24,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-23 02:09:24,897 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 16 states have (on average 3.8125) internal successors, (61), 18 states have internal predecessors, (61), 15 states have call successors, (18), 1 states have call predecessors, (18), 7 states have return successors, (21), 7 states have call predecessors, (21), 15 states have call successors, (21) Word has length 188 [2021-11-23 02:09:24,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:24,900 INFO L225 Difference]: With dead ends: 142 [2021-11-23 02:09:24,901 INFO L226 Difference]: Without dead ends: 128 [2021-11-23 02:09:24,901 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 396 GetRequests, 374 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2021-11-23 02:09:24,902 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 68 mSDsluCounter, 127 mSDsCounter, 0 mSdLazyCounter, 197 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 135 SdHoareTripleChecker+Invalid, 249 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 197 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:24,902 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [82 Valid, 135 Invalid, 249 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 197 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:09:24,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-11-23 02:09:24,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 107. [2021-11-23 02:09:24,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 70 states have (on average 1.1285714285714286) internal successors, (79), 72 states have internal predecessors, (79), 20 states have call successors, (20), 9 states have call predecessors, (20), 16 states have return successors, (49), 25 states have call predecessors, (49), 20 states have call successors, (49) [2021-11-23 02:09:24,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 148 transitions. [2021-11-23 02:09:24,917 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 148 transitions. Word has length 188 [2021-11-23 02:09:24,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:24,918 INFO L470 AbstractCegarLoop]: Abstraction has 107 states and 148 transitions. [2021-11-23 02:09:24,918 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 16 states have (on average 3.8125) internal successors, (61), 18 states have internal predecessors, (61), 15 states have call successors, (18), 1 states have call predecessors, (18), 7 states have return successors, (21), 7 states have call predecessors, (21), 15 states have call successors, (21) [2021-11-23 02:09:24,918 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 148 transitions. [2021-11-23 02:09:24,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 240 [2021-11-23 02:09:24,923 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:24,923 INFO L514 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 14, 12, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 6, 5, 4, 3, 1, 1, 1, 1, 1, 1] [2021-11-23 02:09:24,962 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-23 02:09:25,147 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:09:25,147 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:25,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:25,148 INFO L85 PathProgramCache]: Analyzing trace with hash 384777542, now seen corresponding path program 4 times [2021-11-23 02:09:25,148 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:09:25,148 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [496225520] [2021-11-23 02:09:25,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:25,148 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:09:25,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:25,377 INFO L134 CoverageAnalysis]: Checked inductivity of 1569 backedges. 279 proven. 371 refuted. 0 times theorem prover too weak. 919 trivial. 0 not checked. [2021-11-23 02:09:25,378 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:09:25,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [496225520] [2021-11-23 02:09:25,378 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [496225520] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:09:25,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1729225105] [2021-11-23 02:09:25,378 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:09:25,378 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:09:25,378 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:09:25,379 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:09:25,406 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 02:09:25,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:25,553 INFO L263 TraceCheckSpWp]: Trace formula consists of 557 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-23 02:09:25,559 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:25,983 INFO L134 CoverageAnalysis]: Checked inductivity of 1569 backedges. 85 proven. 439 refuted. 0 times theorem prover too weak. 1045 trivial. 0 not checked. [2021-11-23 02:09:25,984 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:28,051 INFO L134 CoverageAnalysis]: Checked inductivity of 1569 backedges. 85 proven. 463 refuted. 0 times theorem prover too weak. 1021 trivial. 0 not checked. [2021-11-23 02:09:28,051 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1729225105] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:09:28,051 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1133452721] [2021-11-23 02:09:28,054 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 02:09:28,054 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:09:28,054 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 02:09:28,055 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:09:28,056 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 12, 17] total 32 [2021-11-23 02:09:28,056 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1973279619] [2021-11-23 02:09:28,056 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:09:28,058 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 02:09:28,058 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:09:28,058 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 02:09:28,059 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=879, Unknown=0, NotChecked=0, Total=992 [2021-11-23 02:09:28,060 INFO L87 Difference]: Start difference. First operand 107 states and 148 transitions. Second operand has 32 states, 30 states have (on average 3.3) internal successors, (99), 32 states have internal predecessors, (99), 25 states have call successors, (31), 1 states have call predecessors, (31), 15 states have return successors, (39), 16 states have call predecessors, (39), 25 states have call successors, (39) [2021-11-23 02:09:29,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:29,483 INFO L93 Difference]: Finished difference Result 300 states and 568 transitions. [2021-11-23 02:09:29,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-23 02:09:29,489 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 30 states have (on average 3.3) internal successors, (99), 32 states have internal predecessors, (99), 25 states have call successors, (31), 1 states have call predecessors, (31), 15 states have return successors, (39), 16 states have call predecessors, (39), 25 states have call successors, (39) Word has length 239 [2021-11-23 02:09:29,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:29,493 INFO L225 Difference]: With dead ends: 300 [2021-11-23 02:09:29,493 INFO L226 Difference]: Without dead ends: 182 [2021-11-23 02:09:29,497 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 530 GetRequests, 467 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 924 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=590, Invalid=3570, Unknown=0, NotChecked=0, Total=4160 [2021-11-23 02:09:29,498 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 187 mSDsluCounter, 616 mSDsCounter, 0 mSdLazyCounter, 1391 mSolverCounterSat, 321 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 188 SdHoareTripleChecker+Valid, 642 SdHoareTripleChecker+Invalid, 1712 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 321 IncrementalHoareTripleChecker+Valid, 1391 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:29,499 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [188 Valid, 642 Invalid, 1712 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [321 Valid, 1391 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 02:09:29,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2021-11-23 02:09:29,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 148. [2021-11-23 02:09:29,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 101 states have (on average 1.099009900990099) internal successors, (111), 100 states have internal predecessors, (111), 28 states have call successors, (28), 17 states have call predecessors, (28), 18 states have return successors, (68), 30 states have call predecessors, (68), 28 states have call successors, (68) [2021-11-23 02:09:29,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 207 transitions. [2021-11-23 02:09:29,520 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 207 transitions. Word has length 239 [2021-11-23 02:09:29,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:29,522 INFO L470 AbstractCegarLoop]: Abstraction has 148 states and 207 transitions. [2021-11-23 02:09:29,522 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 30 states have (on average 3.3) internal successors, (99), 32 states have internal predecessors, (99), 25 states have call successors, (31), 1 states have call predecessors, (31), 15 states have return successors, (39), 16 states have call predecessors, (39), 25 states have call successors, (39) [2021-11-23 02:09:29,523 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 207 transitions. [2021-11-23 02:09:29,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 811 [2021-11-23 02:09:29,557 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:29,558 INFO L514 BasicCegarLoop]: trace histogram [66, 66, 54, 53, 53, 39, 33, 33, 33, 33, 33, 33, 33, 28, 26, 26, 26, 26, 26, 26, 26, 14, 12, 6, 1, 1, 1, 1, 1, 1] [2021-11-23 02:09:29,598 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-23 02:09:29,772 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:09:29,773 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:29,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:29,773 INFO L85 PathProgramCache]: Analyzing trace with hash 480742356, now seen corresponding path program 5 times [2021-11-23 02:09:29,773 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:09:29,774 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [944598483] [2021-11-23 02:09:29,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:29,774 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:09:29,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:30,220 INFO L134 CoverageAnalysis]: Checked inductivity of 19676 backedges. 279 proven. 1809 refuted. 0 times theorem prover too weak. 17588 trivial. 0 not checked. [2021-11-23 02:09:30,220 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:09:30,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [944598483] [2021-11-23 02:09:30,221 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [944598483] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:09:30,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1004214828] [2021-11-23 02:09:30,221 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:09:30,221 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:09:30,222 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:09:30,222 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:09:30,242 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-23 02:09:30,378 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 02:09:30,379 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:09:30,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 02:09:30,395 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:31,588 INFO L134 CoverageAnalysis]: Checked inductivity of 19676 backedges. 1238 proven. 4 refuted. 0 times theorem prover too weak. 18434 trivial. 0 not checked. [2021-11-23 02:09:31,588 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:34,454 INFO L134 CoverageAnalysis]: Checked inductivity of 19676 backedges. 1238 proven. 4 refuted. 0 times theorem prover too weak. 18434 trivial. 0 not checked. [2021-11-23 02:09:34,454 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1004214828] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:09:34,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [741692274] [2021-11-23 02:09:34,460 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 02:09:34,461 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:09:34,462 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 02:09:34,463 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:09:34,464 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 7, 7] total 18 [2021-11-23 02:09:34,468 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1631627165] [2021-11-23 02:09:34,468 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:09:34,472 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-23 02:09:34,472 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:09:34,473 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-23 02:09:34,473 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2021-11-23 02:09:34,473 INFO L87 Difference]: Start difference. First operand 148 states and 207 transitions. Second operand has 18 states, 17 states have (on average 3.7058823529411766) internal successors, (63), 18 states have internal predecessors, (63), 10 states have call successors, (15), 1 states have call predecessors, (15), 11 states have return successors, (22), 10 states have call predecessors, (22), 10 states have call successors, (22) [2021-11-23 02:09:34,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:34,845 INFO L93 Difference]: Finished difference Result 351 states and 610 transitions. [2021-11-23 02:09:34,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 02:09:34,846 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 3.7058823529411766) internal successors, (63), 18 states have internal predecessors, (63), 10 states have call successors, (15), 1 states have call predecessors, (15), 11 states have return successors, (22), 10 states have call predecessors, (22), 10 states have call successors, (22) Word has length 810 [2021-11-23 02:09:34,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:34,850 INFO L225 Difference]: With dead ends: 351 [2021-11-23 02:09:34,851 INFO L226 Difference]: Without dead ends: 202 [2021-11-23 02:09:34,853 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1647 GetRequests, 1617 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=167, Invalid=703, Unknown=0, NotChecked=0, Total=870 [2021-11-23 02:09:34,854 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 98 mSDsluCounter, 154 mSDsCounter, 0 mSdLazyCounter, 335 mSolverCounterSat, 90 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 161 SdHoareTripleChecker+Invalid, 425 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 90 IncrementalHoareTripleChecker+Valid, 335 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:34,855 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [106 Valid, 161 Invalid, 425 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [90 Valid, 335 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:09:34,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2021-11-23 02:09:34,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 182. [2021-11-23 02:09:34,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 123 states have (on average 1.0975609756097562) internal successors, (135), 121 states have internal predecessors, (135), 36 states have call successors, (36), 20 states have call predecessors, (36), 22 states have return successors, (123), 40 states have call predecessors, (123), 36 states have call successors, (123) [2021-11-23 02:09:34,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 294 transitions. [2021-11-23 02:09:34,878 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 294 transitions. Word has length 810 [2021-11-23 02:09:34,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:34,878 INFO L470 AbstractCegarLoop]: Abstraction has 182 states and 294 transitions. [2021-11-23 02:09:34,879 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 3.7058823529411766) internal successors, (63), 18 states have internal predecessors, (63), 10 states have call successors, (15), 1 states have call predecessors, (15), 11 states have return successors, (22), 10 states have call predecessors, (22), 10 states have call successors, (22) [2021-11-23 02:09:34,879 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 294 transitions. [2021-11-23 02:09:34,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 463 [2021-11-23 02:09:34,884 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:34,884 INFO L514 BasicCegarLoop]: trace histogram [34, 34, 33, 33, 31, 26, 17, 17, 17, 17, 17, 17, 17, 16, 16, 16, 16, 16, 16, 16, 14, 10, 8, 2, 1, 1, 1, 1, 1, 1] [2021-11-23 02:09:34,921 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-23 02:09:35,106 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-23 02:09:35,106 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:35,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:35,107 INFO L85 PathProgramCache]: Analyzing trace with hash -1895528608, now seen corresponding path program 6 times [2021-11-23 02:09:35,107 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:09:35,107 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [803932162] [2021-11-23 02:09:35,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:35,107 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:09:35,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:35,417 INFO L134 CoverageAnalysis]: Checked inductivity of 6170 backedges. 332 proven. 971 refuted. 0 times theorem prover too weak. 4867 trivial. 0 not checked. [2021-11-23 02:09:35,417 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:09:35,417 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [803932162] [2021-11-23 02:09:35,417 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [803932162] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:09:35,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1365968335] [2021-11-23 02:09:35,418 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:09:35,418 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:09:35,418 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:09:35,422 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:09:35,444 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-23 02:09:35,653 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:09:35,653 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:09:35,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 822 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 02:09:35,674 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:36,350 INFO L134 CoverageAnalysis]: Checked inductivity of 6170 backedges. 1749 proven. 32 refuted. 0 times theorem prover too weak. 4389 trivial. 0 not checked. [2021-11-23 02:09:36,350 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:38,630 INFO L134 CoverageAnalysis]: Checked inductivity of 6170 backedges. 259 proven. 1006 refuted. 0 times theorem prover too weak. 4905 trivial. 0 not checked. [2021-11-23 02:09:38,630 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1365968335] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:09:38,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2090633495] [2021-11-23 02:09:38,633 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 02:09:38,633 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:09:38,633 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 02:09:38,634 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:09:38,635 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 12, 13] total 25 [2021-11-23 02:09:38,635 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097437825] [2021-11-23 02:09:38,635 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:09:38,637 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-23 02:09:38,637 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:09:38,637 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-23 02:09:38,644 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=523, Unknown=0, NotChecked=0, Total=600 [2021-11-23 02:09:38,645 INFO L87 Difference]: Start difference. First operand 182 states and 294 transitions. Second operand has 25 states, 25 states have (on average 3.8) internal successors, (95), 25 states have internal predecessors, (95), 17 states have call successors, (30), 2 states have call predecessors, (30), 11 states have return successors, (37), 14 states have call predecessors, (37), 17 states have call successors, (37) [2021-11-23 02:09:39,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:39,508 INFO L93 Difference]: Finished difference Result 342 states and 581 transitions. [2021-11-23 02:09:39,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-23 02:09:39,509 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 3.8) internal successors, (95), 25 states have internal predecessors, (95), 17 states have call successors, (30), 2 states have call predecessors, (30), 11 states have return successors, (37), 14 states have call predecessors, (37), 17 states have call successors, (37) Word has length 462 [2021-11-23 02:09:39,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:39,512 INFO L225 Difference]: With dead ends: 342 [2021-11-23 02:09:39,512 INFO L226 Difference]: Without dead ends: 162 [2021-11-23 02:09:39,515 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 958 GetRequests, 914 SyntacticMatches, 2 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 347 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=311, Invalid=1581, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 02:09:39,516 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 116 mSDsluCounter, 377 mSDsCounter, 0 mSdLazyCounter, 700 mSolverCounterSat, 120 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 399 SdHoareTripleChecker+Invalid, 820 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 120 IncrementalHoareTripleChecker+Valid, 700 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:39,517 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [116 Valid, 399 Invalid, 820 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [120 Valid, 700 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:09:39,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2021-11-23 02:09:39,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 157. [2021-11-23 02:09:39,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 110 states have (on average 1.0818181818181818) internal successors, (119), 105 states have internal predecessors, (119), 29 states have call successors, (29), 22 states have call predecessors, (29), 17 states have return successors, (59), 29 states have call predecessors, (59), 29 states have call successors, (59) [2021-11-23 02:09:39,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 207 transitions. [2021-11-23 02:09:39,533 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 207 transitions. Word has length 462 [2021-11-23 02:09:39,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:39,534 INFO L470 AbstractCegarLoop]: Abstraction has 157 states and 207 transitions. [2021-11-23 02:09:39,534 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 3.8) internal successors, (95), 25 states have internal predecessors, (95), 17 states have call successors, (30), 2 states have call predecessors, (30), 11 states have return successors, (37), 14 states have call predecessors, (37), 17 states have call successors, (37) [2021-11-23 02:09:39,534 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 207 transitions. [2021-11-23 02:09:39,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 501 [2021-11-23 02:09:39,539 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:39,539 INFO L514 BasicCegarLoop]: trace histogram [37, 37, 36, 36, 30, 29, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 12, 11, 7, 7, 1, 1, 1, 1, 1, 1] [2021-11-23 02:09:39,585 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-23 02:09:39,752 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-23 02:09:39,753 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:39,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:39,753 INFO L85 PathProgramCache]: Analyzing trace with hash -1957614995, now seen corresponding path program 7 times [2021-11-23 02:09:39,753 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:09:39,753 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1419009362] [2021-11-23 02:09:39,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:39,754 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:09:39,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:40,056 INFO L134 CoverageAnalysis]: Checked inductivity of 7249 backedges. 209 proven. 1230 refuted. 0 times theorem prover too weak. 5810 trivial. 0 not checked. [2021-11-23 02:09:40,056 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:09:40,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1419009362] [2021-11-23 02:09:40,057 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1419009362] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:09:40,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1928225395] [2021-11-23 02:09:40,057 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:09:40,058 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:09:40,058 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:09:40,059 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:09:40,084 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-23 02:09:40,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:40,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 1136 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 02:09:40,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:41,253 INFO L134 CoverageAnalysis]: Checked inductivity of 7249 backedges. 209 proven. 1230 refuted. 0 times theorem prover too weak. 5810 trivial. 0 not checked. [2021-11-23 02:09:41,253 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:44,315 INFO L134 CoverageAnalysis]: Checked inductivity of 7249 backedges. 209 proven. 1263 refuted. 0 times theorem prover too weak. 5777 trivial. 0 not checked. [2021-11-23 02:09:44,316 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1928225395] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:09:44,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1989589193] [2021-11-23 02:09:44,319 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 02:09:44,319 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:09:44,320 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 02:09:44,321 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:09:44,322 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 19] total 22 [2021-11-23 02:09:44,322 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1313071795] [2021-11-23 02:09:44,322 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:09:44,324 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-23 02:09:44,324 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:09:44,325 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-23 02:09:44,325 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2021-11-23 02:09:44,325 INFO L87 Difference]: Start difference. First operand 157 states and 207 transitions. Second operand has 22 states, 20 states have (on average 3.7) internal successors, (74), 22 states have internal predecessors, (74), 19 states have call successors, (22), 1 states have call predecessors, (22), 9 states have return successors, (27), 9 states have call predecessors, (27), 19 states have call successors, (27) [2021-11-23 02:09:44,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:44,611 INFO L93 Difference]: Finished difference Result 184 states and 262 transitions. [2021-11-23 02:09:44,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 02:09:44,612 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 20 states have (on average 3.7) internal successors, (74), 22 states have internal predecessors, (74), 19 states have call successors, (22), 1 states have call predecessors, (22), 9 states have return successors, (27), 9 states have call predecessors, (27), 19 states have call successors, (27) Word has length 500 [2021-11-23 02:09:44,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:44,619 INFO L225 Difference]: With dead ends: 184 [2021-11-23 02:09:44,619 INFO L226 Difference]: Without dead ends: 170 [2021-11-23 02:09:44,623 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1025 GetRequests, 997 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2021-11-23 02:09:44,626 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 81 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 283 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 181 SdHoareTripleChecker+Invalid, 350 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 283 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:44,626 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [96 Valid, 181 Invalid, 350 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 283 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:09:44,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-11-23 02:09:44,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 160. [2021-11-23 02:09:44,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 112 states have (on average 1.0803571428571428) internal successors, (121), 107 states have internal predecessors, (121), 29 states have call successors, (29), 22 states have call predecessors, (29), 18 states have return successors, (61), 30 states have call predecessors, (61), 29 states have call successors, (61) [2021-11-23 02:09:44,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 211 transitions. [2021-11-23 02:09:44,646 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 211 transitions. Word has length 500 [2021-11-23 02:09:44,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:44,649 INFO L470 AbstractCegarLoop]: Abstraction has 160 states and 211 transitions. [2021-11-23 02:09:44,649 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 20 states have (on average 3.7) internal successors, (74), 22 states have internal predecessors, (74), 19 states have call successors, (22), 1 states have call predecessors, (22), 9 states have return successors, (27), 9 states have call predecessors, (27), 19 states have call successors, (27) [2021-11-23 02:09:44,650 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 211 transitions. [2021-11-23 02:09:44,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 678 [2021-11-23 02:09:44,656 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:44,657 INFO L514 BasicCegarLoop]: trace histogram [51, 51, 48, 48, 41, 39, 25, 25, 25, 25, 25, 25, 25, 24, 24, 24, 24, 24, 24, 24, 17, 14, 10, 9, 1, 1, 1, 1, 1, 1] [2021-11-23 02:09:44,700 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-23 02:09:44,872 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:09:44,872 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:44,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:44,873 INFO L85 PathProgramCache]: Analyzing trace with hash -93142244, now seen corresponding path program 8 times [2021-11-23 02:09:44,873 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:09:44,873 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1961046666] [2021-11-23 02:09:44,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:44,873 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:09:45,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:45,436 INFO L134 CoverageAnalysis]: Checked inductivity of 13477 backedges. 1308 proven. 1823 refuted. 0 times theorem prover too weak. 10346 trivial. 0 not checked. [2021-11-23 02:09:45,436 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:09:45,437 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1961046666] [2021-11-23 02:09:45,437 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1961046666] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:09:45,437 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1747212543] [2021-11-23 02:09:45,437 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:09:45,437 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:09:45,437 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:09:45,438 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:09:45,464 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-23 02:09:45,721 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2021-11-23 02:09:45,721 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:09:45,724 INFO L263 TraceCheckSpWp]: Trace formula consists of 457 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 02:09:45,737 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:46,718 INFO L134 CoverageAnalysis]: Checked inductivity of 13477 backedges. 1069 proven. 161 refuted. 0 times theorem prover too weak. 12247 trivial. 0 not checked. [2021-11-23 02:09:46,718 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:09:49,420 INFO L134 CoverageAnalysis]: Checked inductivity of 13477 backedges. 1069 proven. 173 refuted. 0 times theorem prover too weak. 12235 trivial. 0 not checked. [2021-11-23 02:09:49,420 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1747212543] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:09:49,420 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1410599750] [2021-11-23 02:09:49,423 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 02:09:49,423 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:09:49,423 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 02:09:49,425 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:09:49,426 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 10, 13] total 33 [2021-11-23 02:09:49,426 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1247934704] [2021-11-23 02:09:49,426 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:09:49,428 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-23 02:09:49,429 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:09:49,429 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-23 02:09:49,430 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=938, Unknown=0, NotChecked=0, Total=1056 [2021-11-23 02:09:49,430 INFO L87 Difference]: Start difference. First operand 160 states and 211 transitions. Second operand has 33 states, 31 states have (on average 3.2903225806451615) internal successors, (102), 33 states have internal predecessors, (102), 22 states have call successors, (33), 1 states have call predecessors, (33), 18 states have return successors, (44), 24 states have call predecessors, (44), 22 states have call successors, (44) [2021-11-23 02:09:51,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:09:51,048 INFO L93 Difference]: Finished difference Result 390 states and 609 transitions. [2021-11-23 02:09:51,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-11-23 02:09:51,049 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 31 states have (on average 3.2903225806451615) internal successors, (102), 33 states have internal predecessors, (102), 22 states have call successors, (33), 1 states have call predecessors, (33), 18 states have return successors, (44), 24 states have call predecessors, (44), 22 states have call successors, (44) Word has length 677 [2021-11-23 02:09:51,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:09:51,055 INFO L225 Difference]: With dead ends: 390 [2021-11-23 02:09:51,055 INFO L226 Difference]: Without dead ends: 236 [2021-11-23 02:09:51,062 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1419 GetRequests, 1347 SyntacticMatches, 3 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1311 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=644, Invalid=4326, Unknown=0, NotChecked=0, Total=4970 [2021-11-23 02:09:51,063 INFO L933 BasicCegarLoop]: 50 mSDtfsCounter, 254 mSDsluCounter, 482 mSDsCounter, 0 mSdLazyCounter, 1227 mSolverCounterSat, 364 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 255 SdHoareTripleChecker+Valid, 520 SdHoareTripleChecker+Invalid, 1591 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 364 IncrementalHoareTripleChecker+Valid, 1227 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:09:51,063 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [255 Valid, 520 Invalid, 1591 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [364 Valid, 1227 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 02:09:51,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2021-11-23 02:09:51,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 200. [2021-11-23 02:09:51,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 200 states, 140 states have (on average 1.0857142857142856) internal successors, (152), 135 states have internal predecessors, (152), 39 states have call successors, (39), 29 states have call predecessors, (39), 20 states have return successors, (88), 35 states have call predecessors, (88), 39 states have call successors, (88) [2021-11-23 02:09:51,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 279 transitions. [2021-11-23 02:09:51,091 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 279 transitions. Word has length 677 [2021-11-23 02:09:51,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:09:51,093 INFO L470 AbstractCegarLoop]: Abstraction has 200 states and 279 transitions. [2021-11-23 02:09:51,094 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 31 states have (on average 3.2903225806451615) internal successors, (102), 33 states have internal predecessors, (102), 22 states have call successors, (33), 1 states have call predecessors, (33), 18 states have return successors, (44), 24 states have call predecessors, (44), 22 states have call successors, (44) [2021-11-23 02:09:51,094 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 279 transitions. [2021-11-23 02:09:51,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1073 [2021-11-23 02:09:51,108 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:09:51,109 INFO L514 BasicCegarLoop]: trace histogram [81, 81, 76, 76, 65, 62, 40, 40, 40, 40, 40, 40, 40, 38, 38, 38, 38, 38, 38, 38, 27, 22, 16, 14, 1, 1, 1, 1, 1, 1] [2021-11-23 02:09:51,161 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-23 02:09:51,336 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-23 02:09:51,337 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:09:51,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:09:51,337 INFO L85 PathProgramCache]: Analyzing trace with hash -1824353437, now seen corresponding path program 9 times [2021-11-23 02:09:51,337 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:09:51,337 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1772985074] [2021-11-23 02:09:51,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:09:51,338 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:09:51,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:09:52,016 INFO L134 CoverageAnalysis]: Checked inductivity of 34263 backedges. 419 proven. 3305 refuted. 0 times theorem prover too weak. 30539 trivial. 0 not checked. [2021-11-23 02:09:52,016 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:09:52,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1772985074] [2021-11-23 02:09:52,017 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1772985074] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:09:52,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [503247856] [2021-11-23 02:09:52,017 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:09:52,017 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:09:52,018 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:09:52,024 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:09:52,048 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-23 02:09:52,557 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:09:52,557 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:09:52,566 INFO L263 TraceCheckSpWp]: Trace formula consists of 1907 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 02:09:52,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:09:54,180 INFO L134 CoverageAnalysis]: Checked inductivity of 34263 backedges. 18229 proven. 1897 refuted. 0 times theorem prover too weak. 14137 trivial. 0 not checked. [2021-11-23 02:09:54,180 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:10:01,240 INFO L134 CoverageAnalysis]: Checked inductivity of 34263 backedges. 1231 proven. 4923 refuted. 0 times theorem prover too weak. 28109 trivial. 0 not checked. [2021-11-23 02:10:01,241 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [503247856] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:10:01,244 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [825231262] [2021-11-23 02:10:01,252 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 02:10:01,252 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:10:01,253 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 02:10:01,254 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:10:01,256 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21, 31] total 38 [2021-11-23 02:10:01,258 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [99463453] [2021-11-23 02:10:01,258 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:10:01,262 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-23 02:10:01,262 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:10:01,263 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-23 02:10:01,263 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=1262, Unknown=0, NotChecked=0, Total=1406 [2021-11-23 02:10:01,264 INFO L87 Difference]: Start difference. First operand 200 states and 279 transitions. Second operand has 38 states, 37 states have (on average 3.72972972972973) internal successors, (138), 38 states have internal predecessors, (138), 34 states have call successors, (42), 2 states have call predecessors, (42), 18 states have return successors, (54), 17 states have call predecessors, (54), 34 states have call successors, (54) [2021-11-23 02:10:03,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:10:03,319 INFO L93 Difference]: Finished difference Result 495 states and 814 transitions. [2021-11-23 02:10:03,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-11-23 02:10:03,320 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 37 states have (on average 3.72972972972973) internal successors, (138), 38 states have internal predecessors, (138), 34 states have call successors, (42), 2 states have call predecessors, (42), 18 states have return successors, (54), 17 states have call predecessors, (54), 34 states have call successors, (54) Word has length 1072 [2021-11-23 02:10:03,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:10:03,328 INFO L225 Difference]: With dead ends: 495 [2021-11-23 02:10:03,328 INFO L226 Difference]: Without dead ends: 287 [2021-11-23 02:10:03,333 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2202 GetRequests, 2125 SyntacticMatches, 2 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1208 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=845, Invalid=5007, Unknown=0, NotChecked=0, Total=5852 [2021-11-23 02:10:03,334 INFO L933 BasicCegarLoop]: 43 mSDtfsCounter, 350 mSDsluCounter, 581 mSDsCounter, 0 mSdLazyCounter, 1538 mSolverCounterSat, 649 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 351 SdHoareTripleChecker+Valid, 605 SdHoareTripleChecker+Invalid, 2187 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 649 IncrementalHoareTripleChecker+Valid, 1538 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:10:03,335 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [351 Valid, 605 Invalid, 2187 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [649 Valid, 1538 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2021-11-23 02:10:03,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 287 states. [2021-11-23 02:10:03,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 287 to 266. [2021-11-23 02:10:03,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 266 states, 189 states have (on average 1.0687830687830688) internal successors, (202), 182 states have internal predecessors, (202), 54 states have call successors, (54), 44 states have call predecessors, (54), 22 states have return successors, (145), 39 states have call predecessors, (145), 54 states have call successors, (145) [2021-11-23 02:10:03,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 266 states to 266 states and 401 transitions. [2021-11-23 02:10:03,362 INFO L78 Accepts]: Start accepts. Automaton has 266 states and 401 transitions. Word has length 1072 [2021-11-23 02:10:03,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:10:03,363 INFO L470 AbstractCegarLoop]: Abstraction has 266 states and 401 transitions. [2021-11-23 02:10:03,364 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 37 states have (on average 3.72972972972973) internal successors, (138), 38 states have internal predecessors, (138), 34 states have call successors, (42), 2 states have call predecessors, (42), 18 states have return successors, (54), 17 states have call predecessors, (54), 34 states have call successors, (54) [2021-11-23 02:10:03,364 INFO L276 IsEmpty]: Start isEmpty. Operand 266 states and 401 transitions. [2021-11-23 02:10:03,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1196 [2021-11-23 02:10:03,379 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:10:03,380 INFO L514 BasicCegarLoop]: trace histogram [91, 91, 84, 84, 72, 70, 45, 45, 45, 45, 45, 45, 45, 42, 42, 42, 42, 42, 42, 42, 30, 25, 19, 14, 1, 1, 1, 1, 1, 1] [2021-11-23 02:10:03,426 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-23 02:10:03,596 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-23 02:10:03,597 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:10:03,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:10:03,597 INFO L85 PathProgramCache]: Analyzing trace with hash 1737605894, now seen corresponding path program 10 times [2021-11-23 02:10:03,598 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:10:03,598 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1248638720] [2021-11-23 02:10:03,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:10:03,598 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:10:04,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:10:04,499 INFO L134 CoverageAnalysis]: Checked inductivity of 42699 backedges. 2022 proven. 4111 refuted. 0 times theorem prover too weak. 36566 trivial. 0 not checked. [2021-11-23 02:10:04,499 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:10:04,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1248638720] [2021-11-23 02:10:04,499 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1248638720] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:10:04,500 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1538081930] [2021-11-23 02:10:04,500 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:10:04,500 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:10:04,500 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:10:04,501 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:10:04,504 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-23 02:10:05,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:10:05,097 INFO L263 TraceCheckSpWp]: Trace formula consists of 2679 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-23 02:10:05,119 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:10:06,911 INFO L134 CoverageAnalysis]: Checked inductivity of 42699 backedges. 682 proven. 3937 refuted. 0 times theorem prover too weak. 38080 trivial. 0 not checked. [2021-11-23 02:10:06,911 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:10:13,239 INFO L134 CoverageAnalysis]: Checked inductivity of 42699 backedges. 682 proven. 3993 refuted. 0 times theorem prover too weak. 38024 trivial. 0 not checked. [2021-11-23 02:10:13,240 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1538081930] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:10:13,240 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1707060126] [2021-11-23 02:10:13,243 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 02:10:13,243 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:10:13,244 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 02:10:13,245 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:10:13,246 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 15, 23] total 40 [2021-11-23 02:10:13,247 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [679848958] [2021-11-23 02:10:13,247 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:10:13,251 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-23 02:10:13,251 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:10:13,251 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-23 02:10:13,252 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=1393, Unknown=0, NotChecked=0, Total=1560 [2021-11-23 02:10:13,253 INFO L87 Difference]: Start difference. First operand 266 states and 401 transitions. Second operand has 40 states, 38 states have (on average 3.3157894736842106) internal successors, (126), 40 states have internal predecessors, (126), 34 states have call successors, (40), 1 states have call predecessors, (40), 20 states have return successors, (54), 21 states have call predecessors, (54), 34 states have call successors, (54) [2021-11-23 02:10:15,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:10:15,507 INFO L93 Difference]: Finished difference Result 602 states and 1125 transitions. [2021-11-23 02:10:15,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-11-23 02:10:15,508 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 38 states have (on average 3.3157894736842106) internal successors, (126), 40 states have internal predecessors, (126), 34 states have call successors, (40), 1 states have call predecessors, (40), 20 states have return successors, (54), 21 states have call predecessors, (54), 34 states have call successors, (54) Word has length 1195 [2021-11-23 02:10:15,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:10:15,514 INFO L225 Difference]: With dead ends: 602 [2021-11-23 02:10:15,515 INFO L226 Difference]: Without dead ends: 335 [2021-11-23 02:10:15,522 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2465 GetRequests, 2379 SyntacticMatches, 0 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1861 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1015, Invalid=6641, Unknown=0, NotChecked=0, Total=7656 [2021-11-23 02:10:15,523 INFO L933 BasicCegarLoop]: 54 mSDtfsCounter, 343 mSDsluCounter, 725 mSDsCounter, 0 mSdLazyCounter, 1903 mSolverCounterSat, 671 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 344 SdHoareTripleChecker+Valid, 760 SdHoareTripleChecker+Invalid, 2574 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 671 IncrementalHoareTripleChecker+Valid, 1903 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:10:15,523 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [344 Valid, 760 Invalid, 2574 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [671 Valid, 1903 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2021-11-23 02:10:15,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 335 states. [2021-11-23 02:10:15,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 335 to 274. [2021-11-23 02:10:15,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 274 states, 194 states have (on average 1.0463917525773196) internal successors, (203), 189 states have internal predecessors, (203), 56 states have call successors, (56), 44 states have call predecessors, (56), 23 states have return successors, (141), 40 states have call predecessors, (141), 56 states have call successors, (141) [2021-11-23 02:10:15,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274 states to 274 states and 400 transitions. [2021-11-23 02:10:15,554 INFO L78 Accepts]: Start accepts. Automaton has 274 states and 400 transitions. Word has length 1195 [2021-11-23 02:10:15,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:10:15,555 INFO L470 AbstractCegarLoop]: Abstraction has 274 states and 400 transitions. [2021-11-23 02:10:15,556 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 38 states have (on average 3.3157894736842106) internal successors, (126), 40 states have internal predecessors, (126), 34 states have call successors, (40), 1 states have call predecessors, (40), 20 states have return successors, (54), 21 states have call predecessors, (54), 34 states have call successors, (54) [2021-11-23 02:10:15,556 INFO L276 IsEmpty]: Start isEmpty. Operand 274 states and 400 transitions. [2021-11-23 02:10:15,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2244 [2021-11-23 02:10:15,602 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:10:15,603 INFO L514 BasicCegarLoop]: trace histogram [165, 165, 164, 164, 133, 133, 82, 82, 82, 82, 82, 82, 82, 82, 82, 82, 82, 82, 82, 82, 51, 51, 32, 31, 1, 1, 1, 1, 1, 1] [2021-11-23 02:10:15,643 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2021-11-23 02:10:15,828 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-23 02:10:15,829 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:10:15,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:10:15,829 INFO L85 PathProgramCache]: Analyzing trace with hash 354972367, now seen corresponding path program 11 times [2021-11-23 02:10:15,829 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:10:15,830 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1798853343] [2021-11-23 02:10:15,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:10:15,830 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:10:16,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:10:17,624 INFO L134 CoverageAnalysis]: Checked inductivity of 151708 backedges. 6325 proven. 8544 refuted. 0 times theorem prover too weak. 136839 trivial. 0 not checked. [2021-11-23 02:10:17,625 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:10:17,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1798853343] [2021-11-23 02:10:17,625 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1798853343] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:10:17,625 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [494368293] [2021-11-23 02:10:17,626 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:10:17,626 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:10:17,626 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:10:17,627 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:10:17,627 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-23 02:10:18,096 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 32 check-sat command(s) [2021-11-23 02:10:18,097 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:10:18,102 INFO L263 TraceCheckSpWp]: Trace formula consists of 1139 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 02:10:18,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:10:20,939 INFO L134 CoverageAnalysis]: Checked inductivity of 151708 backedges. 4763 proven. 532 refuted. 0 times theorem prover too weak. 146413 trivial. 0 not checked. [2021-11-23 02:10:20,940 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:10:29,030 INFO L134 CoverageAnalysis]: Checked inductivity of 151708 backedges. 4767 proven. 548 refuted. 0 times theorem prover too weak. 146393 trivial. 0 not checked. [2021-11-23 02:10:29,031 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [494368293] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:10:29,031 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1808183927] [2021-11-23 02:10:29,034 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 02:10:29,035 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:10:29,035 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 02:10:29,037 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:10:29,039 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 11, 15] total 37 [2021-11-23 02:10:29,039 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1166923529] [2021-11-23 02:10:29,040 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:10:29,045 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-23 02:10:29,046 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:10:29,046 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-23 02:10:29,047 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=1189, Unknown=0, NotChecked=0, Total=1332 [2021-11-23 02:10:29,048 INFO L87 Difference]: Start difference. First operand 274 states and 400 transitions. Second operand has 37 states, 35 states have (on average 3.342857142857143) internal successors, (117), 37 states have internal predecessors, (117), 28 states have call successors, (39), 1 states have call predecessors, (39), 21 states have return successors, (55), 28 states have call predecessors, (55), 28 states have call successors, (55) [2021-11-23 02:10:30,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:10:30,985 INFO L93 Difference]: Finished difference Result 596 states and 913 transitions. [2021-11-23 02:10:30,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-11-23 02:10:30,986 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 35 states have (on average 3.342857142857143) internal successors, (117), 37 states have internal predecessors, (117), 28 states have call successors, (39), 1 states have call predecessors, (39), 21 states have return successors, (55), 28 states have call predecessors, (55), 28 states have call successors, (55) Word has length 2243 [2021-11-23 02:10:30,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:10:30,997 INFO L225 Difference]: With dead ends: 596 [2021-11-23 02:10:30,997 INFO L226 Difference]: Without dead ends: 348 [2021-11-23 02:10:31,002 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4569 GetRequests, 4486 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1886 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=879, Invalid=6261, Unknown=0, NotChecked=0, Total=7140 [2021-11-23 02:10:31,003 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 259 mSDsluCounter, 732 mSDsCounter, 0 mSdLazyCounter, 1789 mSolverCounterSat, 383 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 260 SdHoareTripleChecker+Valid, 776 SdHoareTripleChecker+Invalid, 2172 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 383 IncrementalHoareTripleChecker+Valid, 1789 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:10:31,003 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [260 Valid, 776 Invalid, 2172 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [383 Valid, 1789 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-23 02:10:31,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 348 states. [2021-11-23 02:10:31,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 348 to 267. [2021-11-23 02:10:31,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 267 states, 188 states have (on average 1.047872340425532) internal successors, (197), 184 states have internal predecessors, (197), 55 states have call successors, (55), 42 states have call predecessors, (55), 23 states have return successors, (119), 40 states have call predecessors, (119), 55 states have call successors, (119) [2021-11-23 02:10:31,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 371 transitions. [2021-11-23 02:10:31,029 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 371 transitions. Word has length 2243 [2021-11-23 02:10:31,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:10:31,032 INFO L470 AbstractCegarLoop]: Abstraction has 267 states and 371 transitions. [2021-11-23 02:10:31,033 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 35 states have (on average 3.342857142857143) internal successors, (117), 37 states have internal predecessors, (117), 28 states have call successors, (39), 1 states have call predecessors, (39), 21 states have return successors, (55), 28 states have call predecessors, (55), 28 states have call successors, (55) [2021-11-23 02:10:31,033 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 371 transitions. [2021-11-23 02:10:31,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3701 [2021-11-23 02:10:31,197 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:10:31,199 INFO L514 BasicCegarLoop]: trace histogram [277, 277, 266, 266, 221, 218, 138, 138, 138, 138, 138, 138, 138, 133, 133, 133, 133, 133, 133, 133, 88, 80, 56, 48, 1, 1, 1, 1, 1, 1] [2021-11-23 02:10:31,245 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-23 02:10:31,416 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:10:31,417 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:10:31,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:10:31,419 INFO L85 PathProgramCache]: Analyzing trace with hash -1907559628, now seen corresponding path program 12 times [2021-11-23 02:10:31,419 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:10:31,419 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1493429223] [2021-11-23 02:10:31,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:10:31,419 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:10:32,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:10:34,588 INFO L134 CoverageAnalysis]: Checked inductivity of 414771 backedges. 1536 proven. 14942 refuted. 0 times theorem prover too weak. 398293 trivial. 0 not checked. [2021-11-23 02:10:34,589 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:10:34,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1493429223] [2021-11-23 02:10:34,589 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1493429223] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:10:34,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1001752908] [2021-11-23 02:10:34,590 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:10:34,590 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:10:34,590 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:10:34,593 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:10:34,614 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-23 02:10:35,668 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:10:35,669 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:10:35,694 INFO L263 TraceCheckSpWp]: Trace formula consists of 6584 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-23 02:10:35,738 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:10:40,093 INFO L134 CoverageAnalysis]: Checked inductivity of 414771 backedges. 157845 proven. 3730 refuted. 0 times theorem prover too weak. 253196 trivial. 0 not checked. [2021-11-23 02:10:40,093 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:10:57,686 INFO L134 CoverageAnalysis]: Checked inductivity of 414771 backedges. 3140 proven. 23217 refuted. 0 times theorem prover too weak. 388414 trivial. 0 not checked. [2021-11-23 02:10:57,686 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1001752908] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:10:57,686 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [641740140] [2021-11-23 02:10:57,689 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 02:10:57,689 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:10:57,689 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 02:10:57,693 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:10:57,696 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 23, 35] total 43 [2021-11-23 02:10:57,697 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [641609776] [2021-11-23 02:10:57,697 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:10:57,703 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-23 02:10:57,703 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:10:57,704 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-23 02:10:57,704 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=1630, Unknown=0, NotChecked=0, Total=1806 [2021-11-23 02:10:57,705 INFO L87 Difference]: Start difference. First operand 267 states and 371 transitions. Second operand has 43 states, 42 states have (on average 3.642857142857143) internal successors, (153), 43 states have internal predecessors, (153), 39 states have call successors, (48), 2 states have call predecessors, (48), 21 states have return successors, (64), 20 states have call predecessors, (64), 39 states have call successors, (64) [2021-11-23 02:11:00,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:11:00,253 INFO L93 Difference]: Finished difference Result 653 states and 1036 transitions. [2021-11-23 02:11:00,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2021-11-23 02:11:00,254 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 42 states have (on average 3.642857142857143) internal successors, (153), 43 states have internal predecessors, (153), 39 states have call successors, (48), 2 states have call predecessors, (48), 21 states have return successors, (64), 20 states have call predecessors, (64), 39 states have call successors, (64) Word has length 3700 [2021-11-23 02:11:00,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:11:00,264 INFO L225 Difference]: With dead ends: 653 [2021-11-23 02:11:00,264 INFO L226 Difference]: Without dead ends: 398 [2021-11-23 02:11:00,274 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7479 GetRequests, 7380 SyntacticMatches, 2 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2269 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1331, Invalid=8371, Unknown=0, NotChecked=0, Total=9702 [2021-11-23 02:11:00,275 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 432 mSDsluCounter, 825 mSDsCounter, 0 mSdLazyCounter, 2125 mSolverCounterSat, 884 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 433 SdHoareTripleChecker+Valid, 846 SdHoareTripleChecker+Invalid, 3009 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 884 IncrementalHoareTripleChecker+Valid, 2125 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:11:00,276 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [433 Valid, 846 Invalid, 3009 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [884 Valid, 2125 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2021-11-23 02:11:00,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 398 states. [2021-11-23 02:11:00,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 398 to 309. [2021-11-23 02:11:00,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 309 states, 218 states have (on average 1.0458715596330275) internal successors, (228), 213 states have internal predecessors, (228), 65 states have call successors, (65), 50 states have call predecessors, (65), 25 states have return successors, (145), 45 states have call predecessors, (145), 65 states have call successors, (145) [2021-11-23 02:11:00,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 309 states to 309 states and 438 transitions. [2021-11-23 02:11:00,319 INFO L78 Accepts]: Start accepts. Automaton has 309 states and 438 transitions. Word has length 3700 [2021-11-23 02:11:00,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:11:00,321 INFO L470 AbstractCegarLoop]: Abstraction has 309 states and 438 transitions. [2021-11-23 02:11:00,321 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 42 states have (on average 3.642857142857143) internal successors, (153), 43 states have internal predecessors, (153), 39 states have call successors, (48), 2 states have call predecessors, (48), 21 states have return successors, (64), 20 states have call predecessors, (64), 39 states have call successors, (64) [2021-11-23 02:11:00,322 INFO L276 IsEmpty]: Start isEmpty. Operand 309 states and 438 transitions. [2021-11-23 02:11:00,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6915 [2021-11-23 02:11:00,909 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:11:00,912 INFO L514 BasicCegarLoop]: trace histogram [510, 510, 505, 505, 411, 410, 255, 255, 255, 255, 255, 255, 255, 252, 252, 252, 252, 252, 252, 252, 159, 155, 99, 95, 1, 1, 1, 1, 1, 1] [2021-11-23 02:11:00,962 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-23 02:11:01,132 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:11:01,133 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:11:01,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:11:01,135 INFO L85 PathProgramCache]: Analyzing trace with hash 1231249648, now seen corresponding path program 13 times [2021-11-23 02:11:01,136 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:11:01,136 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1592057234] [2021-11-23 02:11:01,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:11:01,136 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:11:04,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:11:10,075 INFO L134 CoverageAnalysis]: Checked inductivity of 1452364 backedges. 4493 proven. 23693 refuted. 0 times theorem prover too weak. 1424178 trivial. 0 not checked. [2021-11-23 02:11:10,076 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:11:10,076 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1592057234] [2021-11-23 02:11:10,076 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1592057234] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:11:10,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1086062813] [2021-11-23 02:11:10,077 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:11:10,078 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:11:10,078 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:11:10,079 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:11:10,104 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-23 02:11:12,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:11:12,446 INFO L263 TraceCheckSpWp]: Trace formula consists of 15377 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 02:11:12,526 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:11:20,464 INFO L134 CoverageAnalysis]: Checked inductivity of 1452364 backedges. 2604 proven. 31355 refuted. 0 times theorem prover too weak. 1418405 trivial. 0 not checked. [2021-11-23 02:11:20,464 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:11:48,494 INFO L134 CoverageAnalysis]: Checked inductivity of 1452364 backedges. 2604 proven. 31440 refuted. 0 times theorem prover too weak. 1418320 trivial. 0 not checked. [2021-11-23 02:11:48,494 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1086062813] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:11:48,494 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [476571228] [2021-11-23 02:11:48,499 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 02:11:48,500 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:11:48,500 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 02:11:48,501 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:11:48,506 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 17, 27] total 33 [2021-11-23 02:11:48,506 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [303266457] [2021-11-23 02:11:48,506 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:11:48,514 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-23 02:11:48,514 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:11:48,515 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-23 02:11:48,515 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=885, Unknown=0, NotChecked=0, Total=1056 [2021-11-23 02:11:48,515 INFO L87 Difference]: Start difference. First operand 309 states and 438 transitions. Second operand has 33 states, 31 states have (on average 3.4516129032258065) internal successors, (107), 33 states have internal predecessors, (107), 29 states have call successors, (33), 1 states have call predecessors, (33), 16 states have return successors, (46), 17 states have call predecessors, (46), 29 states have call successors, (46) [2021-11-23 02:11:49,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:11:49,127 INFO L93 Difference]: Finished difference Result 359 states and 581 transitions. [2021-11-23 02:11:49,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-23 02:11:49,128 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 31 states have (on average 3.4516129032258065) internal successors, (107), 33 states have internal predecessors, (107), 29 states have call successors, (33), 1 states have call predecessors, (33), 16 states have return successors, (46), 17 states have call predecessors, (46), 29 states have call successors, (46) Word has length 6914 [2021-11-23 02:11:49,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:11:49,143 INFO L225 Difference]: With dead ends: 359 [2021-11-23 02:11:49,143 INFO L226 Difference]: Without dead ends: 335 [2021-11-23 02:11:49,145 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 13864 GetRequests, 13818 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 438 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=419, Invalid=1837, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 02:11:49,146 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 215 mSDsluCounter, 225 mSDsCounter, 0 mSdLazyCounter, 428 mSolverCounterSat, 214 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 233 SdHoareTripleChecker+Valid, 225 SdHoareTripleChecker+Invalid, 642 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 214 IncrementalHoareTripleChecker+Valid, 428 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:11:49,147 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [233 Valid, 225 Invalid, 642 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [214 Valid, 428 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:11:49,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 335 states. [2021-11-23 02:11:49,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 335 to 320. [2021-11-23 02:11:49,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 320 states, 225 states have (on average 1.0444444444444445) internal successors, (235), 220 states have internal predecessors, (235), 66 states have call successors, (66), 50 states have call predecessors, (66), 28 states have return successors, (164), 49 states have call predecessors, (164), 66 states have call successors, (164) [2021-11-23 02:11:49,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 320 states to 320 states and 465 transitions. [2021-11-23 02:11:49,180 INFO L78 Accepts]: Start accepts. Automaton has 320 states and 465 transitions. Word has length 6914 [2021-11-23 02:11:49,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:11:49,183 INFO L470 AbstractCegarLoop]: Abstraction has 320 states and 465 transitions. [2021-11-23 02:11:49,183 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 31 states have (on average 3.4516129032258065) internal successors, (107), 33 states have internal predecessors, (107), 29 states have call successors, (33), 1 states have call predecessors, (33), 16 states have return successors, (46), 17 states have call predecessors, (46), 29 states have call successors, (46) [2021-11-23 02:11:49,183 INFO L276 IsEmpty]: Start isEmpty. Operand 320 states and 465 transitions. [2021-11-23 02:11:49,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6629 [2021-11-23 02:11:49,535 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:11:49,537 INFO L514 BasicCegarLoop]: trace histogram [488, 488, 485, 485, 394, 393, 244, 244, 244, 244, 244, 244, 244, 242, 242, 242, 242, 242, 242, 242, 152, 149, 94, 92, 1, 1, 1, 1, 1, 1] [2021-11-23 02:11:49,574 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-23 02:11:49,738 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-11-23 02:11:49,738 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:11:49,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:11:49,741 INFO L85 PathProgramCache]: Analyzing trace with hash 1518647657, now seen corresponding path program 14 times [2021-11-23 02:11:49,741 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:11:49,741 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1539758474] [2021-11-23 02:11:49,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:11:49,741 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:11:54,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:11:58,729 INFO L134 CoverageAnalysis]: Checked inductivity of 1334469 backedges. 3309 proven. 31973 refuted. 0 times theorem prover too weak. 1299187 trivial. 0 not checked. [2021-11-23 02:11:58,729 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:11:58,730 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1539758474] [2021-11-23 02:11:58,730 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1539758474] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:11:58,730 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [386486431] [2021-11-23 02:11:58,730 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:11:58,730 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:11:58,730 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:11:58,731 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:11:58,732 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-23 02:11:59,853 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 52 check-sat command(s) [2021-11-23 02:11:59,853 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:11:59,864 INFO L263 TraceCheckSpWp]: Trace formula consists of 1953 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-23 02:11:59,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:12:07,377 INFO L134 CoverageAnalysis]: Checked inductivity of 1334469 backedges. 3309 proven. 31973 refuted. 0 times theorem prover too weak. 1299187 trivial. 0 not checked. [2021-11-23 02:12:07,377 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:12:36,951 INFO L134 CoverageAnalysis]: Checked inductivity of 1334469 backedges. 3309 proven. 32075 refuted. 0 times theorem prover too weak. 1299085 trivial. 0 not checked. [2021-11-23 02:12:36,951 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [386486431] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:12:36,952 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1765046381] [2021-11-23 02:12:36,955 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 02:12:36,956 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:12:36,956 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 02:12:36,957 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:12:36,963 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 29] total 32 [2021-11-23 02:12:36,963 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [960061352] [2021-11-23 02:12:36,963 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:12:36,969 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-23 02:12:36,969 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:12:36,970 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-23 02:12:36,970 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=832, Unknown=0, NotChecked=0, Total=992 [2021-11-23 02:12:36,970 INFO L87 Difference]: Start difference. First operand 320 states and 465 transitions. Second operand has 32 states, 30 states have (on average 3.466666666666667) internal successors, (104), 32 states have internal predecessors, (104), 29 states have call successors, (32), 1 states have call predecessors, (32), 14 states have return successors, (42), 14 states have call predecessors, (42), 29 states have call successors, (42) [2021-11-23 02:12:37,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:12:37,429 INFO L93 Difference]: Finished difference Result 347 states and 534 transitions. [2021-11-23 02:12:37,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-23 02:12:37,432 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 30 states have (on average 3.466666666666667) internal successors, (104), 32 states have internal predecessors, (104), 29 states have call successors, (32), 1 states have call predecessors, (32), 14 states have return successors, (42), 14 states have call predecessors, (42), 29 states have call successors, (42) Word has length 6628 [2021-11-23 02:12:37,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:12:37,445 INFO L225 Difference]: With dead ends: 347 [2021-11-23 02:12:37,446 INFO L226 Difference]: Without dead ends: 333 [2021-11-23 02:12:37,447 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 13296 GetRequests, 13253 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 306 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=369, Invalid=1611, Unknown=0, NotChecked=0, Total=1980 [2021-11-23 02:12:37,448 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 195 mSDsluCounter, 188 mSDsCounter, 0 mSdLazyCounter, 356 mSolverCounterSat, 162 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 217 SdHoareTripleChecker+Valid, 191 SdHoareTripleChecker+Invalid, 518 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 162 IncrementalHoareTripleChecker+Valid, 356 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:12:37,448 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [217 Valid, 191 Invalid, 518 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [162 Valid, 356 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:12:37,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 333 states. [2021-11-23 02:12:37,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 333 to 320. [2021-11-23 02:12:37,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 320 states, 225 states have (on average 1.0444444444444445) internal successors, (235), 220 states have internal predecessors, (235), 66 states have call successors, (66), 50 states have call predecessors, (66), 28 states have return successors, (160), 49 states have call predecessors, (160), 66 states have call successors, (160) [2021-11-23 02:12:37,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 320 states to 320 states and 461 transitions. [2021-11-23 02:12:37,483 INFO L78 Accepts]: Start accepts. Automaton has 320 states and 461 transitions. Word has length 6628 [2021-11-23 02:12:37,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:12:37,485 INFO L470 AbstractCegarLoop]: Abstraction has 320 states and 461 transitions. [2021-11-23 02:12:37,486 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 30 states have (on average 3.466666666666667) internal successors, (104), 32 states have internal predecessors, (104), 29 states have call successors, (32), 1 states have call predecessors, (32), 14 states have return successors, (42), 14 states have call predecessors, (42), 29 states have call successors, (42) [2021-11-23 02:12:37,486 INFO L276 IsEmpty]: Start isEmpty. Operand 320 states and 461 transitions. [2021-11-23 02:12:37,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8590 [2021-11-23 02:12:37,942 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:12:37,945 INFO L514 BasicCegarLoop]: trace histogram [633, 633, 628, 628, 510, 510, 316, 316, 316, 316, 316, 316, 316, 314, 314, 314, 314, 314, 314, 314, 196, 194, 123, 118, 1, 1, 1, 1, 1, 1] [2021-11-23 02:12:37,990 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-23 02:12:38,172 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:12:38,173 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:12:38,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:12:38,175 INFO L85 PathProgramCache]: Analyzing trace with hash -472546133, now seen corresponding path program 15 times [2021-11-23 02:12:38,175 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:12:38,176 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [144428172] [2021-11-23 02:12:38,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:38,176 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:12:44,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:50,326 INFO L134 CoverageAnalysis]: Checked inductivity of 2242858 backedges. 8051 proven. 34226 refuted. 0 times theorem prover too weak. 2200581 trivial. 0 not checked. [2021-11-23 02:12:50,326 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:12:50,326 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [144428172] [2021-11-23 02:12:50,327 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [144428172] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:12:50,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1802257044] [2021-11-23 02:12:50,328 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:12:50,329 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:12:50,329 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:12:50,330 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:12:50,331 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-23 02:12:52,671 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:12:52,671 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:12:52,737 INFO L263 TraceCheckSpWp]: Trace formula consists of 15285 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-23 02:12:52,831 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:13:02,960 INFO L134 CoverageAnalysis]: Checked inductivity of 2242858 backedges. 710683 proven. 7052 refuted. 0 times theorem prover too weak. 1525123 trivial. 0 not checked. [2021-11-23 02:13:02,960 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:13:40,942 INFO L134 CoverageAnalysis]: Checked inductivity of 2242858 backedges. 8598 proven. 62747 refuted. 0 times theorem prover too weak. 2171513 trivial. 0 not checked. [2021-11-23 02:13:40,942 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1802257044] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:13:40,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1544604144] [2021-11-23 02:13:40,946 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 02:13:40,946 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:13:40,947 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 02:13:40,948 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:13:40,955 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 25, 39] total 48 [2021-11-23 02:13:40,955 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1182952511] [2021-11-23 02:13:40,955 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:13:40,958 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-23 02:13:40,959 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:13:40,959 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-23 02:13:40,960 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=215, Invalid=2041, Unknown=0, NotChecked=0, Total=2256 [2021-11-23 02:13:40,960 INFO L87 Difference]: Start difference. First operand 320 states and 461 transitions. Second operand has 48 states, 47 states have (on average 3.574468085106383) internal successors, (168), 48 states have internal predecessors, (168), 43 states have call successors, (53), 2 states have call predecessors, (53), 24 states have return successors, (72), 24 states have call predecessors, (72), 43 states have call successors, (72) [2021-11-23 02:13:44,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:13:44,211 INFO L93 Difference]: Finished difference Result 795 states and 1412 transitions. [2021-11-23 02:13:44,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 89 states. [2021-11-23 02:13:44,212 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 47 states have (on average 3.574468085106383) internal successors, (168), 48 states have internal predecessors, (168), 43 states have call successors, (53), 2 states have call predecessors, (53), 24 states have return successors, (72), 24 states have call predecessors, (72), 43 states have call successors, (72) Word has length 8589 [2021-11-23 02:13:44,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:13:44,224 INFO L225 Difference]: With dead ends: 795 [2021-11-23 02:13:44,224 INFO L226 Difference]: Without dead ends: 501 [2021-11-23 02:13:44,230 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17273 GetRequests, 17155 SyntacticMatches, 2 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3479 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1776, Invalid=12030, Unknown=0, NotChecked=0, Total=13806 [2021-11-23 02:13:44,231 INFO L933 BasicCegarLoop]: 63 mSDtfsCounter, 480 mSDsluCounter, 1074 mSDsCounter, 0 mSdLazyCounter, 3494 mSolverCounterSat, 1204 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 481 SdHoareTripleChecker+Valid, 1111 SdHoareTripleChecker+Invalid, 4698 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1204 IncrementalHoareTripleChecker+Valid, 3494 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:13:44,231 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [481 Valid, 1111 Invalid, 4698 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1204 Valid, 3494 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2021-11-23 02:13:44,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 501 states. [2021-11-23 02:13:44,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 501 to 417. [2021-11-23 02:13:44,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 417 states, 296 states have (on average 1.0439189189189189) internal successors, (309), 291 states have internal predecessors, (309), 91 states have call successors, (91), 72 states have call predecessors, (91), 29 states have return successors, (285), 53 states have call predecessors, (285), 91 states have call successors, (285) [2021-11-23 02:13:44,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 417 states to 417 states and 685 transitions. [2021-11-23 02:13:44,276 INFO L78 Accepts]: Start accepts. Automaton has 417 states and 685 transitions. Word has length 8589 [2021-11-23 02:13:44,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:13:44,279 INFO L470 AbstractCegarLoop]: Abstraction has 417 states and 685 transitions. [2021-11-23 02:13:44,280 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 47 states have (on average 3.574468085106383) internal successors, (168), 48 states have internal predecessors, (168), 43 states have call successors, (53), 2 states have call predecessors, (53), 24 states have return successors, (72), 24 states have call predecessors, (72), 43 states have call successors, (72) [2021-11-23 02:13:44,280 INFO L276 IsEmpty]: Start isEmpty. Operand 417 states and 685 transitions. [2021-11-23 02:13:45,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12975 [2021-11-23 02:13:45,280 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:13:45,284 INFO L514 BasicCegarLoop]: trace histogram [957, 957, 948, 948, 772, 769, 478, 478, 478, 478, 478, 478, 478, 474, 474, 474, 474, 474, 474, 474, 298, 291, 185, 179, 1, 1, 1, 1, 1, 1] [2021-11-23 02:13:45,323 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-23 02:13:45,484 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:13:45,485 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:13:45,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:13:45,488 INFO L85 PathProgramCache]: Analyzing trace with hash -1362620913, now seen corresponding path program 16 times [2021-11-23 02:13:45,488 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:13:45,489 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [818867165] [2021-11-23 02:13:45,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:13:45,489 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:13:58,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:11,456 INFO L134 CoverageAnalysis]: Checked inductivity of 5122614 backedges. 20680 proven. 93689 refuted. 0 times theorem prover too weak. 5008245 trivial. 0 not checked. [2021-11-23 02:14:11,457 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:14:11,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [818867165] [2021-11-23 02:14:11,457 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [818867165] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:14:11,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [281089202] [2021-11-23 02:14:11,458 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:14:11,458 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:14:11,458 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:14:11,459 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:14:11,460 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-23 02:14:15,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:14:15,570 INFO L263 TraceCheckSpWp]: Trace formula consists of 28832 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 02:14:15,680 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:14:29,431 INFO L134 CoverageAnalysis]: Checked inductivity of 5122614 backedges. 5763 proven. 69233 refuted. 0 times theorem prover too weak. 5047618 trivial. 0 not checked. [2021-11-23 02:14:29,431 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:15:23,503 INFO L134 CoverageAnalysis]: Checked inductivity of 5122614 backedges. 5763 proven. 69353 refuted. 0 times theorem prover too weak. 5047498 trivial. 0 not checked. [2021-11-23 02:15:23,503 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [281089202] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:15:23,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [705147934] [2021-11-23 02:15:23,509 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 02:15:23,509 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:15:23,509 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 02:15:23,511 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:15:23,523 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 19, 31] total 51 [2021-11-23 02:15:23,523 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [236522131] [2021-11-23 02:15:23,523 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:15:23,532 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-23 02:15:23,533 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:15:23,533 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-23 02:15:23,534 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=262, Invalid=2288, Unknown=0, NotChecked=0, Total=2550 [2021-11-23 02:15:23,534 INFO L87 Difference]: Start difference. First operand 417 states and 685 transitions. Second operand has 51 states, 50 states have (on average 3.22) internal successors, (161), 51 states have internal predecessors, (161), 45 states have call successors, (51), 1 states have call predecessors, (51), 28 states have return successors, (73), 29 states have call predecessors, (73), 45 states have call successors, (73) [2021-11-23 02:15:27,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:15:27,077 INFO L93 Difference]: Finished difference Result 1051 states and 2107 transitions. [2021-11-23 02:15:27,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2021-11-23 02:15:27,078 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 50 states have (on average 3.22) internal successors, (161), 51 states have internal predecessors, (161), 45 states have call successors, (51), 1 states have call predecessors, (51), 28 states have return successors, (73), 29 states have call predecessors, (73), 45 states have call successors, (73) Word has length 12974 [2021-11-23 02:15:27,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:15:27,094 INFO L225 Difference]: With dead ends: 1051 [2021-11-23 02:15:27,094 INFO L226 Difference]: Without dead ends: 634 [2021-11-23 02:15:27,103 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 26063 GetRequests, 25940 SyntacticMatches, 2 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4079 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1832, Invalid=13174, Unknown=0, NotChecked=0, Total=15006 [2021-11-23 02:15:27,104 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 760 mSDsluCounter, 1165 mSDsCounter, 0 mSdLazyCounter, 3663 mSolverCounterSat, 1678 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 761 SdHoareTripleChecker+Valid, 1213 SdHoareTripleChecker+Invalid, 5341 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1678 IncrementalHoareTripleChecker+Valid, 3663 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:15:27,104 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [761 Valid, 1213 Invalid, 5341 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1678 Valid, 3663 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2021-11-23 02:15:27,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 634 states. [2021-11-23 02:15:27,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 634 to 446. [2021-11-23 02:15:27,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 446 states, 314 states have (on average 1.035031847133758) internal successors, (325), 309 states have internal predecessors, (325), 97 states have call successors, (97), 73 states have call predecessors, (97), 34 states have return successors, (279), 63 states have call predecessors, (279), 97 states have call successors, (279) [2021-11-23 02:15:27,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 446 states to 446 states and 701 transitions. [2021-11-23 02:15:27,163 INFO L78 Accepts]: Start accepts. Automaton has 446 states and 701 transitions. Word has length 12974 [2021-11-23 02:15:27,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:15:27,166 INFO L470 AbstractCegarLoop]: Abstraction has 446 states and 701 transitions. [2021-11-23 02:15:27,166 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 50 states have (on average 3.22) internal successors, (161), 51 states have internal predecessors, (161), 45 states have call successors, (51), 1 states have call predecessors, (51), 28 states have return successors, (73), 29 states have call predecessors, (73), 45 states have call successors, (73) [2021-11-23 02:15:27,167 INFO L276 IsEmpty]: Start isEmpty. Operand 446 states and 701 transitions. [2021-11-23 02:15:29,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17401 [2021-11-23 02:15:29,159 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:15:29,167 INFO L514 BasicCegarLoop]: trace histogram [1285, 1285, 1270, 1270, 1036, 1031, 642, 642, 642, 642, 642, 642, 642, 635, 635, 635, 635, 635, 635, 635, 396, 394, 254, 234, 1, 1, 1, 1, 1, 1] [2021-11-23 02:15:29,244 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2021-11-23 02:15:29,369 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-23 02:15:29,369 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:15:29,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:15:29,375 INFO L85 PathProgramCache]: Analyzing trace with hash -1347695406, now seen corresponding path program 17 times [2021-11-23 02:15:29,375 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:15:29,376 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [57569629] [2021-11-23 02:15:29,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:15:29,377 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:15:56,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:16:19,127 INFO L134 CoverageAnalysis]: Checked inductivity of 9218459 backedges. 35637 proven. 57823 refuted. 0 times theorem prover too weak. 9124999 trivial. 0 not checked. [2021-11-23 02:16:19,128 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:16:19,128 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [57569629] [2021-11-23 02:16:19,128 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [57569629] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:16:19,128 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1223443634] [2021-11-23 02:16:19,129 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:16:19,129 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:16:19,130 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:16:19,132 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:16:19,133 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-23 02:16:20,953 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 60 check-sat command(s) [2021-11-23 02:16:20,953 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:16:20,970 INFO L263 TraceCheckSpWp]: Trace formula consists of 2287 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-23 02:16:21,162 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:16:40,140 INFO L134 CoverageAnalysis]: Checked inductivity of 9218459 backedges. 11841 proven. 98820 refuted. 0 times theorem prover too weak. 9107798 trivial. 0 not checked. [2021-11-23 02:16:40,141 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:17:53,876 INFO L134 CoverageAnalysis]: Checked inductivity of 9218459 backedges. 11834 proven. 98960 refuted. 0 times theorem prover too weak. 9107665 trivial. 0 not checked. [2021-11-23 02:17:53,876 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1223443634] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:17:53,877 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1150613026] [2021-11-23 02:17:53,882 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 02:17:53,882 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:17:53,882 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 02:17:53,884 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:17:53,895 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 21, 34] total 53 [2021-11-23 02:17:53,895 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1960515994] [2021-11-23 02:17:53,895 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:17:53,904 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-23 02:17:53,904 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:17:53,905 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-23 02:17:53,905 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=2470, Unknown=0, NotChecked=0, Total=2756 [2021-11-23 02:17:53,906 INFO L87 Difference]: Start difference. First operand 446 states and 701 transitions. Second operand has 53 states, 51 states have (on average 3.196078431372549) internal successors, (163), 53 states have internal predecessors, (163), 47 states have call successors, (52), 1 states have call predecessors, (52), 29 states have return successors, (74), 30 states have call predecessors, (74), 47 states have call successors, (74) [2021-11-23 02:17:58,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:17:58,066 INFO L93 Difference]: Finished difference Result 1247 states and 2494 transitions. [2021-11-23 02:17:58,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2021-11-23 02:17:58,067 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 51 states have (on average 3.196078431372549) internal successors, (163), 53 states have internal predecessors, (163), 47 states have call successors, (52), 1 states have call predecessors, (52), 29 states have return successors, (74), 30 states have call predecessors, (74), 47 states have call successors, (74) Word has length 17400 [2021-11-23 02:17:58,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:17:58,083 INFO L225 Difference]: With dead ends: 1247 [2021-11-23 02:17:58,083 INFO L226 Difference]: Without dead ends: 576 [2021-11-23 02:17:58,094 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 34907 GetRequests, 34776 SyntacticMatches, 0 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4812 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2008, Invalid=15548, Unknown=0, NotChecked=0, Total=17556 [2021-11-23 02:17:58,095 INFO L933 BasicCegarLoop]: 93 mSDtfsCounter, 565 mSDsluCounter, 1537 mSDsCounter, 0 mSdLazyCounter, 5254 mSolverCounterSat, 1330 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 565 SdHoareTripleChecker+Valid, 1606 SdHoareTripleChecker+Invalid, 6584 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1330 IncrementalHoareTripleChecker+Valid, 5254 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:17:58,095 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [565 Valid, 1606 Invalid, 6584 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1330 Valid, 5254 Invalid, 0 Unknown, 0 Unchecked, 2.6s Time] [2021-11-23 02:17:58,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 576 states. [2021-11-23 02:17:58,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 576 to 493. [2021-11-23 02:17:58,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 493 states, 350 states have (on average 1.04) internal successors, (364), 344 states have internal predecessors, (364), 108 states have call successors, (108), 85 states have call predecessors, (108), 34 states have return successors, (206), 63 states have call predecessors, (206), 108 states have call successors, (206) [2021-11-23 02:17:58,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 493 states to 493 states and 678 transitions. [2021-11-23 02:17:58,157 INFO L78 Accepts]: Start accepts. Automaton has 493 states and 678 transitions. Word has length 17400 [2021-11-23 02:17:58,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:17:58,160 INFO L470 AbstractCegarLoop]: Abstraction has 493 states and 678 transitions. [2021-11-23 02:17:58,161 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 51 states have (on average 3.196078431372549) internal successors, (163), 53 states have internal predecessors, (163), 47 states have call successors, (52), 1 states have call predecessors, (52), 29 states have return successors, (74), 30 states have call predecessors, (74), 47 states have call successors, (74) [2021-11-23 02:17:58,161 INFO L276 IsEmpty]: Start isEmpty. Operand 493 states and 678 transitions. [2021-11-23 02:17:58,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10837 [2021-11-23 02:17:58,959 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:17:58,960 INFO L514 BasicCegarLoop]: trace histogram [796, 796, 795, 795, 645, 642, 398, 398, 398, 398, 398, 398, 398, 397, 397, 397, 397, 397, 397, 397, 248, 244, 153, 151, 1, 1, 1, 1, 1, 1] [2021-11-23 02:17:58,986 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-23 02:17:59,160 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-23 02:17:59,161 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:17:59,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:17:59,163 INFO L85 PathProgramCache]: Analyzing trace with hash -953352126, now seen corresponding path program 18 times [2021-11-23 02:17:59,163 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:17:59,163 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1117314474] [2021-11-23 02:17:59,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:17:59,164 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:18:09,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:18:19,398 INFO L134 CoverageAnalysis]: Checked inductivity of 3571987 backedges. 50004 proven. 42596 refuted. 0 times theorem prover too weak. 3479387 trivial. 0 not checked. [2021-11-23 02:18:19,399 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:18:19,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1117314474] [2021-11-23 02:18:19,399 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1117314474] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:18:19,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1072979121] [2021-11-23 02:18:19,400 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:18:19,400 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:18:19,400 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:18:19,405 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:18:19,406 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-23 02:18:22,528 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:18:22,528 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:18:22,597 INFO L263 TraceCheckSpWp]: Trace formula consists of 19284 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-23 02:18:22,655 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:18:35,000 INFO L134 CoverageAnalysis]: Checked inductivity of 3571987 backedges. 1350965 proven. 13038 refuted. 0 times theorem prover too weak. 2207984 trivial. 0 not checked. [2021-11-23 02:18:35,000 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:19:24,189 INFO L134 CoverageAnalysis]: Checked inductivity of 3571987 backedges. 14483 proven. 84835 refuted. 0 times theorem prover too weak. 3472669 trivial. 0 not checked. [2021-11-23 02:19:24,190 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1072979121] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:19:24,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1932070699] [2021-11-23 02:19:24,195 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2021-11-23 02:19:24,195 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:19:24,195 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 02:19:24,196 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:19:24,205 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 27, 43] total 56 [2021-11-23 02:19:24,205 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [925601365] [2021-11-23 02:19:24,206 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:19:24,211 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-11-23 02:19:24,211 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:19:24,212 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-11-23 02:19:24,213 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=307, Invalid=2773, Unknown=0, NotChecked=0, Total=3080 [2021-11-23 02:19:24,214 INFO L87 Difference]: Start difference. First operand 493 states and 678 transitions. Second operand has 56 states, 56 states have (on average 3.3392857142857144) internal successors, (187), 56 states have internal predecessors, (187), 47 states have call successors, (60), 2 states have call predecessors, (60), 27 states have return successors, (83), 30 states have call predecessors, (83), 47 states have call successors, (83) [2021-11-23 02:19:27,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:19:27,019 INFO L93 Difference]: Finished difference Result 1207 states and 1766 transitions. [2021-11-23 02:19:27,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2021-11-23 02:19:27,019 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 3.3392857142857144) internal successors, (187), 56 states have internal predecessors, (187), 47 states have call successors, (60), 2 states have call predecessors, (60), 27 states have return successors, (83), 30 states have call predecessors, (83), 47 states have call successors, (83) Word has length 10836 [2021-11-23 02:19:27,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:19:27,028 INFO L225 Difference]: With dead ends: 1207 [2021-11-23 02:19:27,028 INFO L226 Difference]: Without dead ends: 706 [2021-11-23 02:19:27,034 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 21779 GetRequests, 21659 SyntacticMatches, 2 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3828 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1794, Invalid=12486, Unknown=0, NotChecked=0, Total=14280 [2021-11-23 02:19:27,034 INFO L933 BasicCegarLoop]: 82 mSDtfsCounter, 480 mSDsluCounter, 1343 mSDsCounter, 0 mSdLazyCounter, 3159 mSolverCounterSat, 1084 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 480 SdHoareTripleChecker+Valid, 1399 SdHoareTripleChecker+Invalid, 4243 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1084 IncrementalHoareTripleChecker+Valid, 3159 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:19:27,035 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [480 Valid, 1399 Invalid, 4243 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1084 Valid, 3159 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2021-11-23 02:19:27,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 706 states. [2021-11-23 02:19:27,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 706 to 506. [2021-11-23 02:19:27,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 506 states, 358 states have (on average 1.0167597765363128) internal successors, (364), 354 states have internal predecessors, (364), 112 states have call successors, (112), 86 states have call predecessors, (112), 35 states have return successors, (233), 65 states have call predecessors, (233), 112 states have call successors, (233) [2021-11-23 02:19:27,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 506 states to 506 states and 709 transitions. [2021-11-23 02:19:27,094 INFO L78 Accepts]: Start accepts. Automaton has 506 states and 709 transitions. Word has length 10836 [2021-11-23 02:19:27,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:19:27,097 INFO L470 AbstractCegarLoop]: Abstraction has 506 states and 709 transitions. [2021-11-23 02:19:27,097 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 3.3392857142857144) internal successors, (187), 56 states have internal predecessors, (187), 47 states have call successors, (60), 2 states have call predecessors, (60), 27 states have return successors, (83), 30 states have call predecessors, (83), 47 states have call successors, (83) [2021-11-23 02:19:27,098 INFO L276 IsEmpty]: Start isEmpty. Operand 506 states and 709 transitions. [2021-11-23 02:19:28,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17292 [2021-11-23 02:19:28,870 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:19:28,872 INFO L514 BasicCegarLoop]: trace histogram [1271, 1271, 1268, 1268, 1030, 1024, 635, 635, 635, 635, 635, 635, 635, 634, 634, 634, 634, 634, 634, 634, 395, 390, 247, 238, 1, 1, 1, 1, 1, 1] [2021-11-23 02:19:28,919 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-23 02:19:29,072 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e5c783bf-4155-49fd-a3ba-ba51fee21e74/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:19:29,072 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:19:29,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:19:29,074 INFO L85 PathProgramCache]: Analyzing trace with hash 803957602, now seen corresponding path program 19 times [2021-11-23 02:19:29,075 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:19:29,075 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1004444870] [2021-11-23 02:19:29,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:19:29,075 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms