./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/fibo_2calls_15-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 2329fc70 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/fibo_2calls_15-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh --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 d89b24ddcb39bc81f78fa19f2306b45fb625208ffa4463b75f31372afe08085d --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-2329fc7 [2022-12-14 10:00:52,197 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 10:00:52,198 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 10:00:52,217 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 10:00:52,217 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 10:00:52,218 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 10:00:52,219 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 10:00:52,221 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 10:00:52,222 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 10:00:52,223 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 10:00:52,224 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 10:00:52,225 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 10:00:52,226 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 10:00:52,227 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 10:00:52,228 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 10:00:52,229 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 10:00:52,229 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 10:00:52,230 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 10:00:52,232 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 10:00:52,234 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 10:00:52,235 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 10:00:52,236 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 10:00:52,237 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 10:00:52,238 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 10:00:52,241 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 10:00:52,242 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 10:00:52,242 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 10:00:52,243 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 10:00:52,243 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 10:00:52,244 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 10:00:52,244 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 10:00:52,245 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 10:00:52,245 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 10:00:52,246 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 10:00:52,247 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 10:00:52,247 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 10:00:52,247 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 10:00:52,248 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 10:00:52,248 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 10:00:52,248 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 10:00:52,249 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 10:00:52,250 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-12-14 10:00:52,283 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 10:00:52,283 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 10:00:52,284 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 10:00:52,284 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 10:00:52,285 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 10:00:52,285 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 10:00:52,285 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 10:00:52,285 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 10:00:52,285 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 10:00:52,285 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 10:00:52,286 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 10:00:52,286 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 10:00:52,286 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 10:00:52,286 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 10:00:52,286 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 10:00:52,286 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 10:00:52,287 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 10:00:52,287 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 10:00:52,287 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 10:00:52,287 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 10:00:52,288 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 10:00:52,288 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 10:00:52,288 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 10:00:52,288 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-12-14 10:00:52,288 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 10:00:52,288 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-12-14 10:00:52,288 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 10:00:52,289 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-12-14 10:00:52,289 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 10:00:52,289 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-12-14 10:00:52,289 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 10:00:52,289 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 10:00:52,290 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 10:00:52,290 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 10:00:52,290 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 10:00:52,290 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 10:00:52,290 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-12-14 10:00:52,290 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 10:00:52,291 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 10:00:52,291 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-12-14 10:00:52,291 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 10:00:52,291 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d89b24ddcb39bc81f78fa19f2306b45fb625208ffa4463b75f31372afe08085d [2022-12-14 10:00:52,480 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 10:00:52,500 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 10:00:52,502 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 10:00:52,503 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 10:00:52,504 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 10:00:52,505 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/recursive-simple/fibo_2calls_15-2.c [2022-12-14 10:00:55,054 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 10:00:55,191 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 10:00:55,192 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/sv-benchmarks/c/recursive-simple/fibo_2calls_15-2.c [2022-12-14 10:00:55,196 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/data/5a96eaf21/3ae5bb4a43104b20bf04d05fc4583ed1/FLAGc98969894 [2022-12-14 10:00:55,208 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/data/5a96eaf21/3ae5bb4a43104b20bf04d05fc4583ed1 [2022-12-14 10:00:55,211 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 10:00:55,212 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 10:00:55,213 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 10:00:55,213 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 10:00:55,216 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 10:00:55,217 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 10:00:55" (1/1) ... [2022-12-14 10:00:55,218 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3e3c749d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 10:00:55, skipping insertion in model container [2022-12-14 10:00:55,218 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 10:00:55" (1/1) ... [2022-12-14 10:00:55,223 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 10:00:55,234 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 10:00:55,355 WARN L237 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_e34550cf-73f8-499b-b471-569318fd0a2c/sv-benchmarks/c/recursive-simple/fibo_2calls_15-2.c[950,963] [2022-12-14 10:00:55,358 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 10:00:55,367 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 10:00:55,380 WARN L237 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_e34550cf-73f8-499b-b471-569318fd0a2c/sv-benchmarks/c/recursive-simple/fibo_2calls_15-2.c[950,963] [2022-12-14 10:00:55,380 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 10:00:55,390 INFO L208 MainTranslator]: Completed translation [2022-12-14 10:00:55,391 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 10:00:55 WrapperNode [2022-12-14 10:00:55,391 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 10:00:55,391 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 10:00:55,392 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 10:00:55,392 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 10:00:55,397 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 10:00:55" (1/1) ... [2022-12-14 10:00:55,402 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 10:00:55" (1/1) ... [2022-12-14 10:00:55,414 INFO L138 Inliner]: procedures = 14, calls = 12, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 21 [2022-12-14 10:00:55,415 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 10:00:55,415 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 10:00:55,415 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 10:00:55,416 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 10:00:55,422 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 10:00:55" (1/1) ... [2022-12-14 10:00:55,422 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 10:00:55" (1/1) ... [2022-12-14 10:00:55,423 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 10:00:55" (1/1) ... [2022-12-14 10:00:55,424 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 10:00:55" (1/1) ... [2022-12-14 10:00:55,426 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 10:00:55" (1/1) ... [2022-12-14 10:00:55,428 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 10:00:55" (1/1) ... [2022-12-14 10:00:55,429 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 10:00:55" (1/1) ... [2022-12-14 10:00:55,430 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 10:00:55" (1/1) ... [2022-12-14 10:00:55,431 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 10:00:55,432 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 10:00:55,432 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 10:00:55,432 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 10:00:55,433 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 10:00:55" (1/1) ... [2022-12-14 10:00:55,438 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 10:00:55,446 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:00:55,456 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 10:00:55,458 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 10:00:55,491 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 10:00:55,491 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 10:00:55,491 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2022-12-14 10:00:55,491 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2022-12-14 10:00:55,492 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2022-12-14 10:00:55,492 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2022-12-14 10:00:55,492 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 10:00:55,492 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 10:00:55,545 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 10:00:55,547 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 10:00:55,639 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 10:00:55,654 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 10:00:55,654 INFO L300 CfgBuilder]: Removed 0 assume(true) statements. [2022-12-14 10:00:55,657 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 10:00:55 BoogieIcfgContainer [2022-12-14 10:00:55,657 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 10:00:55,660 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 10:00:55,660 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 10:00:55,662 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 10:00:55,663 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 10:00:55" (1/3) ... [2022-12-14 10:00:55,663 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41a9790c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 10:00:55, skipping insertion in model container [2022-12-14 10:00:55,663 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 10:00:55" (2/3) ... [2022-12-14 10:00:55,664 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41a9790c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 10:00:55, skipping insertion in model container [2022-12-14 10:00:55,664 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 10:00:55" (3/3) ... [2022-12-14 10:00:55,665 INFO L112 eAbstractionObserver]: Analyzing ICFG fibo_2calls_15-2.c [2022-12-14 10:00:55,681 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 10:00:55,681 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-12-14 10:00:55,744 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 10:00:55,751 INFO L357 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, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@167d433b, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 10:00:55,751 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-12-14 10:00:55,756 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) [2022-12-14 10:00:55,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-12-14 10:00:55,763 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:00:55,764 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:00:55,765 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:00:55,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:00:55,770 INFO L85 PathProgramCache]: Analyzing trace with hash 2097990987, now seen corresponding path program 1 times [2022-12-14 10:00:55,779 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:00:55,780 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1623042152] [2022-12-14 10:00:55,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:00:55,780 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:00:55,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:00:55,975 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 10:00:55,976 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:00:55,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1623042152] [2022-12-14 10:00:55,977 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1623042152] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 10:00:55,977 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 10:00:55,977 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-12-14 10:00:55,979 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [50315789] [2022-12-14 10:00:55,979 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 10:00:55,984 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 10:00:55,984 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:00:56,012 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 10:00:56,013 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-12-14 10:00:56,015 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, 4 states have (on average 1.75) 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) [2022-12-14 10:00:56,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:00:56,096 INFO L93 Difference]: Finished difference Result 34 states and 43 transitions. [2022-12-14 10:00:56,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-12-14 10:00:56,098 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.75) 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 [2022-12-14 10:00:56,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:00:56,107 INFO L225 Difference]: With dead ends: 34 [2022-12-14 10:00:56,107 INFO L226 Difference]: Without dead ends: 26 [2022-12-14 10:00:56,110 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-12-14 10:00:56,113 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 13 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 10:00:56,114 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 66 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 10:00:56,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-12-14 10:00:56,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-12-14 10:00:56,141 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) [2022-12-14 10:00:56,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2022-12-14 10:00:56,142 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 9 [2022-12-14 10:00:56,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:00:56,143 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2022-12-14 10:00:56,143 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.75) 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) [2022-12-14 10:00:56,143 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2022-12-14 10:00:56,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-12-14 10:00:56,144 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:00:56,144 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:00:56,144 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-12-14 10:00:56,144 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:00:56,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:00:56,145 INFO L85 PathProgramCache]: Analyzing trace with hash 1328370967, now seen corresponding path program 1 times [2022-12-14 10:00:56,145 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:00:56,145 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1621403842] [2022-12-14 10:00:56,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:00:56,146 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:00:56,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:00:56,203 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 10:00:56,203 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:00:56,204 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1621403842] [2022-12-14 10:00:56,204 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1621403842] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 10:00:56,204 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 10:00:56,204 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-12-14 10:00:56,204 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [540480403] [2022-12-14 10:00:56,205 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 10:00:56,206 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 10:00:56,206 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:00:56,206 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 10:00:56,207 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-12-14 10:00:56,207 INFO L87 Difference]: Start difference. First operand 26 states and 33 transitions. Second operand has 5 states, 4 states have (on average 2.0) 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) [2022-12-14 10:00:56,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:00:56,257 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2022-12-14 10:00:56,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-12-14 10:00:56,257 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.0) 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 [2022-12-14 10:00:56,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:00:56,259 INFO L225 Difference]: With dead ends: 32 [2022-12-14 10:00:56,259 INFO L226 Difference]: Without dead ends: 28 [2022-12-14 10:00:56,259 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-12-14 10:00:56,260 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 10 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 10:00:56,260 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 63 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 10:00:56,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-12-14 10:00:56,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2022-12-14 10:00:56,265 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) [2022-12-14 10:00:56,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2022-12-14 10:00:56,265 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 10 [2022-12-14 10:00:56,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:00:56,266 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2022-12-14 10:00:56,266 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.0) 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) [2022-12-14 10:00:56,266 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2022-12-14 10:00:56,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-12-14 10:00:56,267 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:00:56,267 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:00:56,267 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-12-14 10:00:56,267 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:00:56,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:00:56,268 INFO L85 PathProgramCache]: Analyzing trace with hash -1296553538, now seen corresponding path program 1 times [2022-12-14 10:00:56,268 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:00:56,268 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1030321221] [2022-12-14 10:00:56,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:00:56,268 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:00:56,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:00:56,343 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 10:00:56,343 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:00:56,344 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1030321221] [2022-12-14 10:00:56,344 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1030321221] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:00:56,344 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [593779685] [2022-12-14 10:00:56,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:00:56,344 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:00:56,345 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:00:56,346 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:00:56,347 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 10:00:56,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:00:56,388 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 6 conjunts are in the unsatisfiable core [2022-12-14 10:00:56,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:00:56,468 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 10:00:56,468 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:00:56,630 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 10:00:56,630 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [593779685] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:00:56,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2027408327] [2022-12-14 10:00:56,645 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-12-14 10:00:56,645 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:00:56,647 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 10:00:56,652 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 10:00:56,652 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 10:00:56,710 INFO L197 IcfgInterpreter]: Interpreting procedure fibo1 with input of size 39 for LOIs [2022-12-14 10:00:56,737 INFO L197 IcfgInterpreter]: Interpreting procedure fibo2 with input of size 39 for LOIs [2022-12-14 10:00:56,743 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 10:00:56,970 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [2027408327] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 10:00:56,970 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:00:56,971 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6, 7, 7] total 17 [2022-12-14 10:00:56,971 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [478894285] [2022-12-14 10:00:56,971 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 10:00:56,972 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-12-14 10:00:56,972 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:00:56,973 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-12-14 10:00:56,973 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2022-12-14 10:00:56,973 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) [2022-12-14 10:00:57,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:00:57,049 INFO L93 Difference]: Finished difference Result 68 states and 91 transitions. [2022-12-14 10:00:57,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-12-14 10:00:57,050 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 [2022-12-14 10:00:57,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:00:57,051 INFO L225 Difference]: With dead ends: 68 [2022-12-14 10:00:57,051 INFO L226 Difference]: Without dead ends: 44 [2022-12-14 10:00:57,051 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 52 SyntacticMatches, 4 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2022-12-14 10:00:57,052 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 19 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 92 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 10:00:57,052 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 92 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 10:00:57,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-12-14 10:00:57,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2022-12-14 10:00:57,064 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) [2022-12-14 10:00:57,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2022-12-14 10:00:57,065 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 22 [2022-12-14 10:00:57,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:00:57,065 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2022-12-14 10:00:57,065 INFO L496 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) [2022-12-14 10:00:57,065 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2022-12-14 10:00:57,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-12-14 10:00:57,066 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:00:57,067 INFO L195 NwaCegarLoop]: 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] [2022-12-14 10:00:57,073 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 10:00:57,267 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:00:57,269 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:00:57,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:00:57,271 INFO L85 PathProgramCache]: Analyzing trace with hash -28918515, now seen corresponding path program 1 times [2022-12-14 10:00:57,271 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:00:57,272 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1919065858] [2022-12-14 10:00:57,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:00:57,273 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:00:57,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:00:57,450 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 10:00:57,450 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:00:57,450 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1919065858] [2022-12-14 10:00:57,451 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1919065858] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:00:57,451 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1358131955] [2022-12-14 10:00:57,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:00:57,451 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:00:57,451 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:00:57,452 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:00:57,453 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 10:00:57,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:00:57,491 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 8 conjunts are in the unsatisfiable core [2022-12-14 10:00:57,494 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:00:57,550 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-12-14 10:00:57,550 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:00:57,772 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 10:00:57,773 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1358131955] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:00:57,773 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [958694122] [2022-12-14 10:00:57,775 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-12-14 10:00:57,776 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:00:57,777 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:00:57,778 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:00:57,778 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 9] total 14 [2022-12-14 10:00:57,778 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1655155876] [2022-12-14 10:00:57,779 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:00:57,779 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-12-14 10:00:57,779 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:00:57,780 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-12-14 10:00:57,780 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2022-12-14 10:00:57,781 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) [2022-12-14 10:00:57,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:00:57,931 INFO L93 Difference]: Finished difference Result 85 states and 121 transitions. [2022-12-14 10:00:57,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-12-14 10:00:57,932 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 [2022-12-14 10:00:57,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:00:57,933 INFO L225 Difference]: With dead ends: 85 [2022-12-14 10:00:57,934 INFO L226 Difference]: Without dead ends: 53 [2022-12-14 10:00:57,934 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 63 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=75, Invalid=305, Unknown=0, NotChecked=0, Total=380 [2022-12-14 10:00:57,935 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 33 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 204 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 230 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 204 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 10:00:57,936 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 95 Invalid, 230 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 204 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 10:00:57,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-12-14 10:00:57,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 44. [2022-12-14 10:00:57,948 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) [2022-12-14 10:00:57,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 53 transitions. [2022-12-14 10:00:57,949 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 53 transitions. Word has length 35 [2022-12-14 10:00:57,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:00:57,949 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 53 transitions. [2022-12-14 10:00:57,950 INFO L496 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) [2022-12-14 10:00:57,950 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 53 transitions. [2022-12-14 10:00:57,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-12-14 10:00:57,951 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:00:57,951 INFO L195 NwaCegarLoop]: 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] [2022-12-14 10:00:57,956 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-12-14 10:00:58,152 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:00:58,152 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:00:58,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:00:58,153 INFO L85 PathProgramCache]: Analyzing trace with hash -243412115, now seen corresponding path program 1 times [2022-12-14 10:00:58,153 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:00:58,153 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [300718371] [2022-12-14 10:00:58,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:00:58,153 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:00:58,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:00:58,295 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 10:00:58,295 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:00:58,295 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [300718371] [2022-12-14 10:00:58,295 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [300718371] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:00:58,295 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1197974879] [2022-12-14 10:00:58,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:00:58,296 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:00:58,296 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:00:58,297 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:00:58,297 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-14 10:00:58,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:00:58,334 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 8 conjunts are in the unsatisfiable core [2022-12-14 10:00:58,335 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:00:58,398 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 10:00:58,398 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:00:58,631 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 10:00:58,631 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1197974879] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:00:58,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1289176716] [2022-12-14 10:00:58,633 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-12-14 10:00:58,634 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:00:58,634 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:00:58,634 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:00:58,634 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 9] total 18 [2022-12-14 10:00:58,635 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1098276293] [2022-12-14 10:00:58,635 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:00:58,635 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-12-14 10:00:58,635 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:00:58,636 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-12-14 10:00:58,636 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2022-12-14 10:00:58,636 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) [2022-12-14 10:00:58,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:00:58,961 INFO L93 Difference]: Finished difference Result 121 states and 203 transitions. [2022-12-14 10:00:58,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-12-14 10:00:58,962 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 [2022-12-14 10:00:58,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:00:58,964 INFO L225 Difference]: With dead ends: 121 [2022-12-14 10:00:58,964 INFO L226 Difference]: Without dead ends: 77 [2022-12-14 10:00:58,965 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 68 SyntacticMatches, 3 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=142, Invalid=670, Unknown=0, NotChecked=0, Total=812 [2022-12-14 10:00:58,966 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 52 mSDsluCounter, 139 mSDsCounter, 0 mSdLazyCounter, 413 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 166 SdHoareTripleChecker+Invalid, 484 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 413 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 10:00:58,966 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [56 Valid, 166 Invalid, 484 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 413 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 10:00:58,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2022-12-14 10:00:58,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 63. [2022-12-14 10:00:58,977 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) [2022-12-14 10:00:58,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 91 transitions. [2022-12-14 10:00:58,979 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 91 transitions. Word has length 36 [2022-12-14 10:00:58,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:00:58,979 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 91 transitions. [2022-12-14 10:00:58,979 INFO L496 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) [2022-12-14 10:00:58,979 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 91 transitions. [2022-12-14 10:00:58,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-12-14 10:00:58,980 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:00:58,980 INFO L195 NwaCegarLoop]: 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] [2022-12-14 10:00:58,985 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-12-14 10:00:59,181 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:00:59,182 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:00:59,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:00:59,184 INFO L85 PathProgramCache]: Analyzing trace with hash 403750738, now seen corresponding path program 1 times [2022-12-14 10:00:59,184 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:00:59,184 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1784456767] [2022-12-14 10:00:59,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:00:59,185 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:00:59,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:00:59,380 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-12-14 10:00:59,381 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:00:59,381 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1784456767] [2022-12-14 10:00:59,381 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1784456767] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:00:59,381 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1883926198] [2022-12-14 10:00:59,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:00:59,381 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:00:59,381 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:00:59,382 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:00:59,383 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-12-14 10:00:59,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:00:59,425 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 10 conjunts are in the unsatisfiable core [2022-12-14 10:00:59,427 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:00:59,487 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-12-14 10:00:59,487 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:00:59,796 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 10:00:59,797 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1883926198] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:00:59,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [142686706] [2022-12-14 10:00:59,799 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-12-14 10:00:59,799 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:00:59,799 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:00:59,799 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:00:59,800 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 11] total 17 [2022-12-14 10:00:59,800 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1819811724] [2022-12-14 10:00:59,800 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:00:59,801 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-12-14 10:00:59,801 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:00:59,801 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-12-14 10:00:59,802 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2022-12-14 10:00:59,802 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) [2022-12-14 10:00:59,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:00:59,970 INFO L93 Difference]: Finished difference Result 119 states and 203 transitions. [2022-12-14 10:00:59,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-12-14 10:00:59,971 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 [2022-12-14 10:00:59,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:00:59,973 INFO L225 Difference]: With dead ends: 119 [2022-12-14 10:00:59,973 INFO L226 Difference]: Without dead ends: 97 [2022-12-14 10:00:59,974 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 91 SyntacticMatches, 4 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 108 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=115, Invalid=437, Unknown=0, NotChecked=0, Total=552 [2022-12-14 10:00:59,975 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 41 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 138 mSolverCounterSat, 52 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 190 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 52 IncrementalHoareTripleChecker+Valid, 138 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 10:00:59,975 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [54 Valid, 73 Invalid, 190 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [52 Valid, 138 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 10:00:59,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2022-12-14 10:00:59,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 72. [2022-12-14 10:00:59,990 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) [2022-12-14 10:00:59,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 105 transitions. [2022-12-14 10:00:59,992 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 105 transitions. Word has length 50 [2022-12-14 10:00:59,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:00:59,992 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 105 transitions. [2022-12-14 10:00:59,992 INFO L496 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) [2022-12-14 10:00:59,992 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 105 transitions. [2022-12-14 10:00:59,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2022-12-14 10:00:59,995 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:00:59,995 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 6, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 10:01:00,000 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-12-14 10:01:00,196 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2022-12-14 10:01:00,197 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:01:00,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:01:00,198 INFO L85 PathProgramCache]: Analyzing trace with hash -1002637961, now seen corresponding path program 1 times [2022-12-14 10:01:00,198 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:01:00,198 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1692710069] [2022-12-14 10:01:00,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:01:00,199 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:01:00,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:01:00,445 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 40 proven. 59 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2022-12-14 10:01:00,445 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:01:00,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1692710069] [2022-12-14 10:01:00,445 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1692710069] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:01:00,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [363560136] [2022-12-14 10:01:00,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:01:00,446 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:01:00,446 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:01:00,447 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:01:00,447 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-12-14 10:01:00,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:01:00,500 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 12 conjunts are in the unsatisfiable core [2022-12-14 10:01:00,501 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:01:00,594 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 13 proven. 92 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2022-12-14 10:01:00,594 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:01:01,108 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 13 proven. 102 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-12-14 10:01:01,109 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [363560136] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:01:01,109 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1743777874] [2022-12-14 10:01:01,110 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-12-14 10:01:01,110 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:01:01,110 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:01:01,111 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:01:01,111 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 13] total 23 [2022-12-14 10:01:01,111 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1827487780] [2022-12-14 10:01:01,111 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:01:01,112 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-12-14 10:01:01,112 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:01:01,112 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-12-14 10:01:01,113 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2022-12-14 10:01:01,113 INFO L87 Difference]: Start difference. First operand 72 states and 105 transitions. Second operand has 23 states, 21 states have (on average 3.5714285714285716) internal successors, (75), 23 states have internal predecessors, (75), 18 states have call successors, (23), 1 states have call predecessors, (23), 9 states have return successors, (27), 10 states have call predecessors, (27), 18 states have call successors, (27) [2022-12-14 10:01:01,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:01:01,561 INFO L93 Difference]: Finished difference Result 204 states and 411 transitions. [2022-12-14 10:01:01,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-12-14 10:01:01,562 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 21 states have (on average 3.5714285714285716) internal successors, (75), 23 states have internal predecessors, (75), 18 states have call successors, (23), 1 states have call predecessors, (23), 9 states have return successors, (27), 10 states have call predecessors, (27), 18 states have call successors, (27) Word has length 92 [2022-12-14 10:01:01,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:01:01,564 INFO L225 Difference]: With dead ends: 204 [2022-12-14 10:01:01,564 INFO L226 Difference]: Without dead ends: 115 [2022-12-14 10:01:01,567 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 167 SyntacticMatches, 5 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=263, Invalid=1297, Unknown=0, NotChecked=0, Total=1560 [2022-12-14 10:01:01,567 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 81 mSDsluCounter, 237 mSDsCounter, 0 mSdLazyCounter, 772 mSolverCounterSat, 127 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 272 SdHoareTripleChecker+Invalid, 899 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 127 IncrementalHoareTripleChecker+Valid, 772 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 10:01:01,567 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [82 Valid, 272 Invalid, 899 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [127 Valid, 772 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 10:01:01,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2022-12-14 10:01:01,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 98. [2022-12-14 10:01:01,578 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) [2022-12-14 10:01:01,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 144 transitions. [2022-12-14 10:01:01,579 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 144 transitions. Word has length 92 [2022-12-14 10:01:01,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:01:01,579 INFO L495 AbstractCegarLoop]: Abstraction has 98 states and 144 transitions. [2022-12-14 10:01:01,579 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 21 states have (on average 3.5714285714285716) internal successors, (75), 23 states have internal predecessors, (75), 18 states have call successors, (23), 1 states have call predecessors, (23), 9 states have return successors, (27), 10 states have call predecessors, (27), 18 states have call successors, (27) [2022-12-14 10:01:01,579 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 144 transitions. [2022-12-14 10:01:01,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2022-12-14 10:01:01,582 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:01:01,582 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 9, 9, 8, 7, 7, 7, 7, 7, 7, 7, 7, 6, 4, 4, 4, 4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1] [2022-12-14 10:01:01,586 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-12-14 10:01:01,783 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-12-14 10:01:01,784 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:01:01,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:01:01,785 INFO L85 PathProgramCache]: Analyzing trace with hash -1530453204, now seen corresponding path program 2 times [2022-12-14 10:01:01,786 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:01:01,786 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1773249797] [2022-12-14 10:01:01,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:01:01,787 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:01:01,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:01:01,946 INFO L134 CoverageAnalysis]: Checked inductivity of 652 backedges. 40 proven. 139 refuted. 0 times theorem prover too weak. 473 trivial. 0 not checked. [2022-12-14 10:01:01,947 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:01:01,947 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1773249797] [2022-12-14 10:01:01,947 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1773249797] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:01:01,947 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [630946196] [2022-12-14 10:01:01,947 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 10:01:01,947 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:01:01,947 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:01:01,948 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:01:01,949 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-12-14 10:01:02,004 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-12-14 10:01:02,005 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 10:01:02,005 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 5 conjunts are in the unsatisfiable core [2022-12-14 10:01:02,008 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:01:02,022 INFO L134 CoverageAnalysis]: Checked inductivity of 652 backedges. 173 proven. 0 refuted. 0 times theorem prover too weak. 479 trivial. 0 not checked. [2022-12-14 10:01:02,022 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 10:01:02,022 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [630946196] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 10:01:02,022 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-12-14 10:01:02,022 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6] total 6 [2022-12-14 10:01:02,022 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [111158120] [2022-12-14 10:01:02,022 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 10:01:02,023 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-12-14 10:01:02,023 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:01:02,023 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-12-14 10:01:02,023 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-12-14 10:01:02,023 INFO L87 Difference]: Start difference. First operand 98 states and 144 transitions. Second operand has 6 states, 5 states have (on average 6.2) internal successors, (31), 6 states have internal predecessors, (31), 3 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) [2022-12-14 10:01:02,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:01:02,055 INFO L93 Difference]: Finished difference Result 188 states and 309 transitions. [2022-12-14 10:01:02,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 10:01:02,056 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 6.2) internal successors, (31), 6 states have internal predecessors, (31), 3 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) Word has length 154 [2022-12-14 10:01:02,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:01:02,057 INFO L225 Difference]: With dead ends: 188 [2022-12-14 10:01:02,057 INFO L226 Difference]: Without dead ends: 100 [2022-12-14 10:01:02,063 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 154 SyntacticMatches, 2 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2022-12-14 10:01:02,064 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 15 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 10:01:02,064 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 71 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 10:01:02,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2022-12-14 10:01:02,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2022-12-14 10:01:02,077 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) [2022-12-14 10:01:02,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 143 transitions. [2022-12-14 10:01:02,079 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 143 transitions. Word has length 154 [2022-12-14 10:01:02,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:01:02,079 INFO L495 AbstractCegarLoop]: Abstraction has 100 states and 143 transitions. [2022-12-14 10:01:02,079 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 6.2) internal successors, (31), 6 states have internal predecessors, (31), 3 states have call successors, (7), 2 states have call predecessors, (7), 3 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) [2022-12-14 10:01:02,080 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 143 transitions. [2022-12-14 10:01:02,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2022-12-14 10:01:02,082 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:01:02,082 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 9, 9, 8, 7, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2022-12-14 10:01:02,086 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-12-14 10:01:02,282 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:01:02,284 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:01:02,284 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:01:02,285 INFO L85 PathProgramCache]: Analyzing trace with hash -3420712, now seen corresponding path program 2 times [2022-12-14 10:01:02,285 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:01:02,286 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1407866896] [2022-12-14 10:01:02,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:01:02,286 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:01:02,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:01:02,605 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 42 proven. 136 refuted. 0 times theorem prover too weak. 259 trivial. 0 not checked. [2022-12-14 10:01:02,605 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:01:02,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1407866896] [2022-12-14 10:01:02,605 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1407866896] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:01:02,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [710546968] [2022-12-14 10:01:02,605 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 10:01:02,605 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:01:02,606 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:01:02,606 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:01:02,607 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-12-14 10:01:02,658 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 10:01:02,658 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 10:01:02,659 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 8 conjunts are in the unsatisfiable core [2022-12-14 10:01:02,662 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:01:02,700 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 93 proven. 23 refuted. 0 times theorem prover too weak. 321 trivial. 0 not checked. [2022-12-14 10:01:02,700 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:01:02,987 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 93 proven. 25 refuted. 0 times theorem prover too weak. 319 trivial. 0 not checked. [2022-12-14 10:01:02,987 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [710546968] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:01:02,987 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1079807188] [2022-12-14 10:01:02,989 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-12-14 10:01:02,989 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:01:02,990 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:01:02,990 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:01:02,990 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 9] total 16 [2022-12-14 10:01:02,990 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2077595406] [2022-12-14 10:01:02,990 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:01:02,991 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-12-14 10:01:02,991 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:01:02,991 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-12-14 10:01:02,991 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=190, Unknown=0, NotChecked=0, Total=240 [2022-12-14 10:01:02,991 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) [2022-12-14 10:01:03,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:01:03,137 INFO L93 Difference]: Finished difference Result 132 states and 213 transitions. [2022-12-14 10:01:03,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-12-14 10:01:03,138 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 132 [2022-12-14 10:01:03,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:01:03,140 INFO L225 Difference]: With dead ends: 132 [2022-12-14 10:01:03,140 INFO L226 Difference]: Without dead ends: 118 [2022-12-14 10:01:03,141 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 258 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=399, Unknown=0, NotChecked=0, Total=506 [2022-12-14 10:01:03,141 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 26 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 180 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 210 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 180 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 10:01:03,142 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 93 Invalid, 210 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 180 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 10:01:03,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2022-12-14 10:01:03,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 108. [2022-12-14 10:01:03,152 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) [2022-12-14 10:01:03,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 160 transitions. [2022-12-14 10:01:03,153 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 160 transitions. Word has length 132 [2022-12-14 10:01:03,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:01:03,153 INFO L495 AbstractCegarLoop]: Abstraction has 108 states and 160 transitions. [2022-12-14 10:01:03,153 INFO L496 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) [2022-12-14 10:01:03,153 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 160 transitions. [2022-12-14 10:01:03,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2022-12-14 10:01:03,155 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:01:03,155 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 10, 9, 9, 9, 7, 7, 7, 7, 7, 7, 7, 6, 4, 4, 4, 4, 4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1] [2022-12-14 10:01:03,159 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-12-14 10:01:03,355 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:01:03,355 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:01:03,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:01:03,356 INFO L85 PathProgramCache]: Analyzing trace with hash 875818344, now seen corresponding path program 1 times [2022-12-14 10:01:03,356 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:01:03,356 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [983358012] [2022-12-14 10:01:03,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:01:03,356 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:01:03,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:01:03,546 INFO L134 CoverageAnalysis]: Checked inductivity of 697 backedges. 74 proven. 164 refuted. 0 times theorem prover too weak. 459 trivial. 0 not checked. [2022-12-14 10:01:03,546 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:01:03,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [983358012] [2022-12-14 10:01:03,547 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [983358012] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:01:03,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1384318674] [2022-12-14 10:01:03,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:01:03,547 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:01:03,547 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:01:03,548 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:01:03,549 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-12-14 10:01:03,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:01:03,615 INFO L263 TraceCheckSpWp]: Trace formula consists of 380 conjuncts, 14 conjunts are in the unsatisfiable core [2022-12-14 10:01:03,618 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:01:03,723 INFO L134 CoverageAnalysis]: Checked inductivity of 697 backedges. 37 proven. 243 refuted. 0 times theorem prover too weak. 417 trivial. 0 not checked. [2022-12-14 10:01:03,723 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:01:04,574 INFO L134 CoverageAnalysis]: Checked inductivity of 697 backedges. 37 proven. 259 refuted. 0 times theorem prover too weak. 401 trivial. 0 not checked. [2022-12-14 10:01:04,574 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1384318674] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:01:04,575 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [696600963] [2022-12-14 10:01:04,576 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-12-14 10:01:04,576 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:01:04,576 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:01:04,577 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:01:04,577 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 15] total 25 [2022-12-14 10:01:04,577 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [79873122] [2022-12-14 10:01:04,577 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:01:04,577 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-12-14 10:01:04,578 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:01:04,578 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-12-14 10:01:04,578 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=523, Unknown=0, NotChecked=0, Total=600 [2022-12-14 10:01:04,578 INFO L87 Difference]: Start difference. First operand 108 states and 160 transitions. Second operand has 25 states, 23 states have (on average 3.5217391304347827) internal successors, (81), 25 states have internal predecessors, (81), 20 states have call successors, (26), 1 states have call predecessors, (26), 10 states have return successors, (32), 11 states have call predecessors, (32), 20 states have call successors, (32) [2022-12-14 10:01:05,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:01:05,112 INFO L93 Difference]: Finished difference Result 271 states and 495 transitions. [2022-12-14 10:01:05,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-12-14 10:01:05,112 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 23 states have (on average 3.5217391304347827) internal successors, (81), 25 states have internal predecessors, (81), 20 states have call successors, (26), 1 states have call predecessors, (26), 10 states have return successors, (32), 11 states have call predecessors, (32), 20 states have call successors, (32) Word has length 160 [2022-12-14 10:01:05,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:01:05,114 INFO L225 Difference]: With dead ends: 271 [2022-12-14 10:01:05,114 INFO L226 Difference]: Without dead ends: 143 [2022-12-14 10:01:05,115 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 301 SyntacticMatches, 6 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 325 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=321, Invalid=1571, Unknown=0, NotChecked=0, Total=1892 [2022-12-14 10:01:05,116 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 108 mSDsluCounter, 241 mSDsCounter, 0 mSdLazyCounter, 823 mSolverCounterSat, 163 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 274 SdHoareTripleChecker+Invalid, 986 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 163 IncrementalHoareTripleChecker+Valid, 823 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 10:01:05,116 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [109 Valid, 274 Invalid, 986 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [163 Valid, 823 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 10:01:05,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2022-12-14 10:01:05,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 115. [2022-12-14 10:01:05,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 76 states have (on average 1.2105263157894737) internal successors, (92), 78 states have internal predecessors, (92), 23 states have call successors, (23), 11 states have call predecessors, (23), 15 states have return successors, (57), 25 states have call predecessors, (57), 23 states have call successors, (57) [2022-12-14 10:01:05,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 172 transitions. [2022-12-14 10:01:05,125 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 172 transitions. Word has length 160 [2022-12-14 10:01:05,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:01:05,125 INFO L495 AbstractCegarLoop]: Abstraction has 115 states and 172 transitions. [2022-12-14 10:01:05,125 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 23 states have (on average 3.5217391304347827) internal successors, (81), 25 states have internal predecessors, (81), 20 states have call successors, (26), 1 states have call predecessors, (26), 10 states have return successors, (32), 11 states have call predecessors, (32), 20 states have call successors, (32) [2022-12-14 10:01:05,125 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 172 transitions. [2022-12-14 10:01:05,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 227 [2022-12-14 10:01:05,127 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:01:05,127 INFO L195 NwaCegarLoop]: trace histogram [17, 17, 16, 16, 13, 12, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 5, 5, 4, 3, 1, 1, 1, 1, 1, 1] [2022-12-14 10:01:05,133 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-12-14 10:01:05,328 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-12-14 10:01:05,329 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:01:05,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:01:05,330 INFO L85 PathProgramCache]: Analyzing trace with hash -1651194323, now seen corresponding path program 3 times [2022-12-14 10:01:05,330 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:01:05,330 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1774917758] [2022-12-14 10:01:05,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:01:05,331 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:01:05,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:01:05,502 INFO L134 CoverageAnalysis]: Checked inductivity of 1392 backedges. 119 proven. 250 refuted. 0 times theorem prover too weak. 1023 trivial. 0 not checked. [2022-12-14 10:01:05,502 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:01:05,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1774917758] [2022-12-14 10:01:05,502 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1774917758] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:01:05,502 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1441307937] [2022-12-14 10:01:05,502 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 10:01:05,503 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:01:05,503 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:01:05,503 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:01:05,504 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-12-14 10:01:05,596 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 10:01:05,596 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 10:01:05,598 INFO L263 TraceCheckSpWp]: Trace formula consists of 401 conjuncts, 14 conjunts are in the unsatisfiable core [2022-12-14 10:01:05,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:01:05,706 INFO L134 CoverageAnalysis]: Checked inductivity of 1392 backedges. 777 proven. 68 refuted. 0 times theorem prover too weak. 547 trivial. 0 not checked. [2022-12-14 10:01:05,706 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:01:06,685 INFO L134 CoverageAnalysis]: Checked inductivity of 1392 backedges. 142 proven. 398 refuted. 0 times theorem prover too weak. 852 trivial. 0 not checked. [2022-12-14 10:01:06,685 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1441307937] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:01:06,685 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1927167862] [2022-12-14 10:01:06,687 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-12-14 10:01:06,687 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:01:06,687 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:01:06,687 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:01:06,687 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13, 15] total 23 [2022-12-14 10:01:06,687 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [254181234] [2022-12-14 10:01:06,687 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:01:06,688 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-12-14 10:01:06,688 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:01:06,688 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-12-14 10:01:06,688 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=442, Unknown=0, NotChecked=0, Total=506 [2022-12-14 10:01:06,689 INFO L87 Difference]: Start difference. First operand 115 states and 172 transitions. Second operand has 23 states, 22 states have (on average 4.2272727272727275) internal successors, (93), 23 states have internal predecessors, (93), 18 states have call successors, (28), 2 states have call predecessors, (28), 11 states have return successors, (34), 11 states have call predecessors, (34), 18 states have call successors, (34) [2022-12-14 10:01:07,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:01:07,176 INFO L93 Difference]: Finished difference Result 271 states and 472 transitions. [2022-12-14 10:01:07,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-12-14 10:01:07,176 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 22 states have (on average 4.2272727272727275) internal successors, (93), 23 states have internal predecessors, (93), 18 states have call successors, (28), 2 states have call predecessors, (28), 11 states have return successors, (34), 11 states have call predecessors, (34), 18 states have call successors, (34) Word has length 226 [2022-12-14 10:01:07,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:01:07,177 INFO L225 Difference]: With dead ends: 271 [2022-12-14 10:01:07,177 INFO L226 Difference]: Without dead ends: 166 [2022-12-14 10:01:07,178 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 484 GetRequests, 435 SyntacticMatches, 7 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 336 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=307, Invalid=1585, Unknown=0, NotChecked=0, Total=1892 [2022-12-14 10:01:07,179 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 112 mSDsluCounter, 152 mSDsCounter, 0 mSdLazyCounter, 624 mSolverCounterSat, 189 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 113 SdHoareTripleChecker+Valid, 183 SdHoareTripleChecker+Invalid, 813 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 189 IncrementalHoareTripleChecker+Valid, 624 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 10:01:07,179 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [113 Valid, 183 Invalid, 813 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [189 Valid, 624 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 10:01:07,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2022-12-14 10:01:07,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 130. [2022-12-14 10:01:07,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 88 states have (on average 1.1477272727272727) internal successors, (101), 88 states have internal predecessors, (101), 25 states have call successors, (25), 15 states have call predecessors, (25), 16 states have return successors, (60), 26 states have call predecessors, (60), 25 states have call successors, (60) [2022-12-14 10:01:07,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 186 transitions. [2022-12-14 10:01:07,195 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 186 transitions. Word has length 226 [2022-12-14 10:01:07,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:01:07,196 INFO L495 AbstractCegarLoop]: Abstraction has 130 states and 186 transitions. [2022-12-14 10:01:07,196 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 22 states have (on average 4.2272727272727275) internal successors, (93), 23 states have internal predecessors, (93), 18 states have call successors, (28), 2 states have call predecessors, (28), 11 states have return successors, (34), 11 states have call predecessors, (34), 18 states have call successors, (34) [2022-12-14 10:01:07,196 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 186 transitions. [2022-12-14 10:01:07,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2022-12-14 10:01:07,199 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:01:07,200 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 15, 15, 13, 11, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 6, 4, 3, 3, 1, 1, 1, 1, 1, 1] [2022-12-14 10:01:07,204 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-12-14 10:01:07,400 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-12-14 10:01:07,401 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:01:07,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:01:07,403 INFO L85 PathProgramCache]: Analyzing trace with hash -1917502608, now seen corresponding path program 4 times [2022-12-14 10:01:07,403 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:01:07,403 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [591839051] [2022-12-14 10:01:07,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:01:07,404 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:01:07,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:01:07,582 INFO L134 CoverageAnalysis]: Checked inductivity of 1229 backedges. 126 proven. 208 refuted. 0 times theorem prover too weak. 895 trivial. 0 not checked. [2022-12-14 10:01:07,582 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:01:07,582 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [591839051] [2022-12-14 10:01:07,582 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [591839051] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:01:07,583 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2114163012] [2022-12-14 10:01:07,583 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 10:01:07,583 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:01:07,583 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:01:07,584 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:01:07,585 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-12-14 10:01:07,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:01:07,682 INFO L263 TraceCheckSpWp]: Trace formula consists of 498 conjuncts, 16 conjunts are in the unsatisfiable core [2022-12-14 10:01:07,685 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:01:07,766 INFO L134 CoverageAnalysis]: Checked inductivity of 1229 backedges. 73 proven. 378 refuted. 0 times theorem prover too weak. 778 trivial. 0 not checked. [2022-12-14 10:01:07,767 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:01:08,890 INFO L134 CoverageAnalysis]: Checked inductivity of 1229 backedges. 73 proven. 402 refuted. 0 times theorem prover too weak. 754 trivial. 0 not checked. [2022-12-14 10:01:08,890 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2114163012] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:01:08,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [797156257] [2022-12-14 10:01:08,892 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-12-14 10:01:08,892 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:01:08,892 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:01:08,892 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:01:08,892 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12, 17] total 24 [2022-12-14 10:01:08,893 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1526792969] [2022-12-14 10:01:08,893 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:01:08,893 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-12-14 10:01:08,893 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:01:08,893 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-12-14 10:01:08,894 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=448, Unknown=0, NotChecked=0, Total=552 [2022-12-14 10:01:08,894 INFO L87 Difference]: Start difference. First operand 130 states and 186 transitions. Second operand has 24 states, 22 states have (on average 3.6363636363636362) internal successors, (80), 24 states have internal predecessors, (80), 19 states have call successors, (24), 1 states have call predecessors, (24), 12 states have return successors, (33), 13 states have call predecessors, (33), 19 states have call successors, (33) [2022-12-14 10:01:09,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:01:09,125 INFO L93 Difference]: Finished difference Result 195 states and 355 transitions. [2022-12-14 10:01:09,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-12-14 10:01:09,125 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 22 states have (on average 3.6363636363636362) internal successors, (80), 24 states have internal predecessors, (80), 19 states have call successors, (24), 1 states have call predecessors, (24), 12 states have return successors, (33), 13 states have call predecessors, (33), 19 states have call successors, (33) Word has length 213 [2022-12-14 10:01:09,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:01:09,128 INFO L225 Difference]: With dead ends: 195 [2022-12-14 10:01:09,128 INFO L226 Difference]: Without dead ends: 171 [2022-12-14 10:01:09,129 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 448 GetRequests, 408 SyntacticMatches, 7 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 350 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=242, Invalid=948, Unknown=0, NotChecked=0, Total=1190 [2022-12-14 10:01:09,130 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 55 mSDsluCounter, 114 mSDsCounter, 0 mSdLazyCounter, 338 mSolverCounterSat, 107 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 131 SdHoareTripleChecker+Invalid, 445 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 107 IncrementalHoareTripleChecker+Valid, 338 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 10:01:09,130 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [61 Valid, 131 Invalid, 445 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [107 Valid, 338 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 10:01:09,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2022-12-14 10:01:09,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 156. [2022-12-14 10:01:09,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 104 states have (on average 1.125) internal successors, (117), 104 states have internal predecessors, (117), 29 states have call successors, (29), 15 states have call predecessors, (29), 22 states have return successors, (91), 36 states have call predecessors, (91), 29 states have call successors, (91) [2022-12-14 10:01:09,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 237 transitions. [2022-12-14 10:01:09,148 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 237 transitions. Word has length 213 [2022-12-14 10:01:09,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:01:09,149 INFO L495 AbstractCegarLoop]: Abstraction has 156 states and 237 transitions. [2022-12-14 10:01:09,149 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 22 states have (on average 3.6363636363636362) internal successors, (80), 24 states have internal predecessors, (80), 19 states have call successors, (24), 1 states have call predecessors, (24), 12 states have return successors, (33), 13 states have call predecessors, (33), 19 states have call successors, (33) [2022-12-14 10:01:09,149 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 237 transitions. [2022-12-14 10:01:09,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 512 [2022-12-14 10:01:09,152 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:01:09,152 INFO L195 NwaCegarLoop]: trace histogram [40, 40, 35, 35, 29, 29, 20, 20, 20, 20, 20, 20, 20, 17, 17, 17, 17, 17, 17, 17, 12, 11, 9, 6, 1, 1, 1, 1, 1, 1] [2022-12-14 10:01:09,158 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2022-12-14 10:01:09,352 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:01:09,353 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:01:09,353 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:01:09,353 INFO L85 PathProgramCache]: Analyzing trace with hash 88942330, now seen corresponding path program 5 times [2022-12-14 10:01:09,353 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:01:09,353 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [44515804] [2022-12-14 10:01:09,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:01:09,353 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:01:09,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:01:09,755 INFO L134 CoverageAnalysis]: Checked inductivity of 7616 backedges. 225 proven. 900 refuted. 0 times theorem prover too weak. 6491 trivial. 0 not checked. [2022-12-14 10:01:09,755 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:01:09,755 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [44515804] [2022-12-14 10:01:09,755 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [44515804] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:01:09,755 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [557105709] [2022-12-14 10:01:09,755 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 10:01:09,756 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:01:09,756 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:01:09,756 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:01:09,757 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-12-14 10:01:09,912 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2022-12-14 10:01:09,912 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 10:01:09,914 INFO L263 TraceCheckSpWp]: Trace formula consists of 559 conjuncts, 12 conjunts are in the unsatisfiable core [2022-12-14 10:01:09,922 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:01:10,013 INFO L134 CoverageAnalysis]: Checked inductivity of 7616 backedges. 3831 proven. 32 refuted. 0 times theorem prover too weak. 3753 trivial. 0 not checked. [2022-12-14 10:01:10,014 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:01:10,985 INFO L134 CoverageAnalysis]: Checked inductivity of 7616 backedges. 947 proven. 345 refuted. 0 times theorem prover too weak. 6324 trivial. 0 not checked. [2022-12-14 10:01:10,985 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [557105709] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:01:10,985 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1757339512] [2022-12-14 10:01:10,986 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-12-14 10:01:10,986 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:01:10,987 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:01:10,987 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:01:10,987 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 13] total 22 [2022-12-14 10:01:10,987 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [973822563] [2022-12-14 10:01:10,987 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:01:10,988 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-12-14 10:01:10,988 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:01:10,988 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-12-14 10:01:10,988 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2022-12-14 10:01:10,988 INFO L87 Difference]: Start difference. First operand 156 states and 237 transitions. Second operand has 22 states, 21 states have (on average 4.333333333333333) internal successors, (91), 22 states have internal predecessors, (91), 16 states have call successors, (28), 2 states have call predecessors, (28), 11 states have return successors, (35), 13 states have call predecessors, (35), 16 states have call successors, (35) [2022-12-14 10:01:11,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:01:11,398 INFO L93 Difference]: Finished difference Result 346 states and 619 transitions. [2022-12-14 10:01:11,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-12-14 10:01:11,398 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 4.333333333333333) internal successors, (91), 22 states have internal predecessors, (91), 16 states have call successors, (28), 2 states have call predecessors, (28), 11 states have return successors, (35), 13 states have call predecessors, (35), 16 states have call successors, (35) Word has length 511 [2022-12-14 10:01:11,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:01:11,401 INFO L225 Difference]: With dead ends: 346 [2022-12-14 10:01:11,402 INFO L226 Difference]: Without dead ends: 200 [2022-12-14 10:01:11,403 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1054 GetRequests, 1009 SyntacticMatches, 6 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 269 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=265, Invalid=1375, Unknown=0, NotChecked=0, Total=1640 [2022-12-14 10:01:11,403 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 104 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 670 mSolverCounterSat, 147 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 177 SdHoareTripleChecker+Invalid, 817 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 147 IncrementalHoareTripleChecker+Valid, 670 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 10:01:11,403 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [105 Valid, 177 Invalid, 817 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [147 Valid, 670 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 10:01:11,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2022-12-14 10:01:11,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 185. [2022-12-14 10:01:11,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 185 states, 124 states have (on average 1.1370967741935485) internal successors, (141), 123 states have internal predecessors, (141), 35 states have call successors, (35), 19 states have call predecessors, (35), 25 states have return successors, (130), 42 states have call predecessors, (130), 35 states have call successors, (130) [2022-12-14 10:01:11,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 306 transitions. [2022-12-14 10:01:11,415 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 306 transitions. Word has length 511 [2022-12-14 10:01:11,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:01:11,416 INFO L495 AbstractCegarLoop]: Abstraction has 185 states and 306 transitions. [2022-12-14 10:01:11,416 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 4.333333333333333) internal successors, (91), 22 states have internal predecessors, (91), 16 states have call successors, (28), 2 states have call predecessors, (28), 11 states have return successors, (35), 13 states have call predecessors, (35), 16 states have call successors, (35) [2022-12-14 10:01:11,416 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 306 transitions. [2022-12-14 10:01:11,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 906 [2022-12-14 10:01:11,430 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:01:11,430 INFO L195 NwaCegarLoop]: trace histogram [71, 71, 62, 62, 53, 51, 35, 35, 35, 35, 35, 35, 35, 31, 31, 31, 31, 31, 31, 31, 20, 20, 18, 9, 1, 1, 1, 1, 1, 1] [2022-12-14 10:01:11,436 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-12-14 10:01:11,631 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:01:11,631 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:01:11,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:01:11,633 INFO L85 PathProgramCache]: Analyzing trace with hash -999795841, now seen corresponding path program 6 times [2022-12-14 10:01:11,634 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:01:11,634 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1379471103] [2022-12-14 10:01:11,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:01:11,635 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:01:11,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:01:12,618 INFO L134 CoverageAnalysis]: Checked inductivity of 24397 backedges. 313 proven. 2438 refuted. 0 times theorem prover too weak. 21646 trivial. 0 not checked. [2022-12-14 10:01:12,618 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:01:12,618 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1379471103] [2022-12-14 10:01:12,618 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1379471103] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:01:12,618 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1249919413] [2022-12-14 10:01:12,618 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 10:01:12,618 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:01:12,618 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:01:12,619 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:01:12,620 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-12-14 10:01:12,845 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 10:01:12,845 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 10:01:12,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 1609 conjuncts, 22 conjunts are in the unsatisfiable core [2022-12-14 10:01:12,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:01:13,008 INFO L134 CoverageAnalysis]: Checked inductivity of 24397 backedges. 9197 proven. 405 refuted. 0 times theorem prover too weak. 14795 trivial. 0 not checked. [2022-12-14 10:01:13,008 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:01:15,498 INFO L134 CoverageAnalysis]: Checked inductivity of 24397 backedges. 530 proven. 3424 refuted. 0 times theorem prover too weak. 20443 trivial. 0 not checked. [2022-12-14 10:01:15,499 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1249919413] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:01:15,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [933339606] [2022-12-14 10:01:15,501 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-12-14 10:01:15,501 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:01:15,501 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:01:15,502 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:01:15,502 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 17, 23] total 31 [2022-12-14 10:01:15,502 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [627089232] [2022-12-14 10:01:15,502 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:01:15,503 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-12-14 10:01:15,503 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:01:15,504 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-12-14 10:01:15,504 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=827, Unknown=0, NotChecked=0, Total=930 [2022-12-14 10:01:15,504 INFO L87 Difference]: Start difference. First operand 185 states and 306 transitions. Second operand has 31 states, 30 states have (on average 3.9) internal successors, (117), 31 states have internal predecessors, (117), 27 states have call successors, (36), 2 states have call predecessors, (36), 15 states have return successors, (46), 14 states have call predecessors, (46), 27 states have call successors, (46) [2022-12-14 10:01:16,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:01:16,406 INFO L93 Difference]: Finished difference Result 452 states and 1021 transitions. [2022-12-14 10:01:16,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-12-14 10:01:16,406 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 30 states have (on average 3.9) internal successors, (117), 31 states have internal predecessors, (117), 27 states have call successors, (36), 2 states have call predecessors, (36), 15 states have return successors, (46), 14 states have call predecessors, (46), 27 states have call successors, (46) Word has length 905 [2022-12-14 10:01:16,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:01:16,409 INFO L225 Difference]: With dead ends: 452 [2022-12-14 10:01:16,409 INFO L226 Difference]: Without dead ends: 261 [2022-12-14 10:01:16,411 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1859 GetRequests, 1787 SyntacticMatches, 11 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 834 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=607, Invalid=3299, Unknown=0, NotChecked=0, Total=3906 [2022-12-14 10:01:16,412 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 213 mSDsluCounter, 253 mSDsCounter, 0 mSdLazyCounter, 1202 mSolverCounterSat, 491 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 214 SdHoareTripleChecker+Valid, 284 SdHoareTripleChecker+Invalid, 1693 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 491 IncrementalHoareTripleChecker+Valid, 1202 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-12-14 10:01:16,412 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [214 Valid, 284 Invalid, 1693 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [491 Valid, 1202 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-12-14 10:01:16,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 261 states. [2022-12-14 10:01:16,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 261 to 227. [2022-12-14 10:01:16,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 227 states, 158 states have (on average 1.139240506329114) internal successors, (180), 152 states have internal predecessors, (180), 43 states have call successors, (43), 32 states have call predecessors, (43), 25 states have return successors, (174), 42 states have call predecessors, (174), 43 states have call successors, (174) [2022-12-14 10:01:16,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 397 transitions. [2022-12-14 10:01:16,436 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 397 transitions. Word has length 905 [2022-12-14 10:01:16,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:01:16,437 INFO L495 AbstractCegarLoop]: Abstraction has 227 states and 397 transitions. [2022-12-14 10:01:16,437 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 30 states have (on average 3.9) internal successors, (117), 31 states have internal predecessors, (117), 27 states have call successors, (36), 2 states have call predecessors, (36), 15 states have return successors, (46), 14 states have call predecessors, (46), 27 states have call successors, (46) [2022-12-14 10:01:16,438 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 397 transitions. [2022-12-14 10:01:16,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 702 [2022-12-14 10:01:16,448 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:01:16,449 INFO L195 NwaCegarLoop]: trace histogram [53, 53, 50, 50, 41, 39, 26, 26, 26, 26, 26, 26, 26, 25, 25, 25, 25, 25, 25, 25, 15, 14, 14, 9, 1, 1, 1, 1, 1, 1] [2022-12-14 10:01:16,456 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-12-14 10:01:16,649 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-12-14 10:01:16,650 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:01:16,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:01:16,651 INFO L85 PathProgramCache]: Analyzing trace with hash 1249936960, now seen corresponding path program 7 times [2022-12-14 10:01:16,651 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:01:16,652 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2039867044] [2022-12-14 10:01:16,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:01:16,652 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:01:16,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:01:17,308 INFO L134 CoverageAnalysis]: Checked inductivity of 14473 backedges. 357 proven. 1452 refuted. 0 times theorem prover too weak. 12664 trivial. 0 not checked. [2022-12-14 10:01:17,309 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:01:17,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2039867044] [2022-12-14 10:01:17,309 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2039867044] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:01:17,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [172408067] [2022-12-14 10:01:17,309 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 10:01:17,309 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:01:17,309 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:01:17,310 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:01:17,311 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-12-14 10:01:17,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:01:17,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 1582 conjuncts, 20 conjunts are in the unsatisfiable core [2022-12-14 10:01:17,548 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:01:17,681 INFO L134 CoverageAnalysis]: Checked inductivity of 14473 backedges. 294 proven. 2052 refuted. 0 times theorem prover too weak. 12127 trivial. 0 not checked. [2022-12-14 10:01:17,681 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:01:20,308 INFO L134 CoverageAnalysis]: Checked inductivity of 14473 backedges. 294 proven. 2096 refuted. 0 times theorem prover too weak. 12083 trivial. 0 not checked. [2022-12-14 10:01:20,309 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [172408067] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:01:20,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [745955510] [2022-12-14 10:01:20,311 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-12-14 10:01:20,311 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:01:20,311 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:01:20,311 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:01:20,312 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 14, 21] total 30 [2022-12-14 10:01:20,312 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2016369163] [2022-12-14 10:01:20,312 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:01:20,314 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-12-14 10:01:20,314 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:01:20,315 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-12-14 10:01:20,315 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=713, Unknown=0, NotChecked=0, Total=870 [2022-12-14 10:01:20,315 INFO L87 Difference]: Start difference. First operand 227 states and 397 transitions. Second operand has 30 states, 28 states have (on average 3.5) internal successors, (98), 30 states have internal predecessors, (98), 25 states have call successors, (30), 1 states have call predecessors, (30), 16 states have return successors, (43), 17 states have call predecessors, (43), 25 states have call successors, (43) [2022-12-14 10:01:20,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:01:20,740 INFO L93 Difference]: Finished difference Result 303 states and 650 transitions. [2022-12-14 10:01:20,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-12-14 10:01:20,741 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 28 states have (on average 3.5) internal successors, (98), 30 states have internal predecessors, (98), 25 states have call successors, (30), 1 states have call predecessors, (30), 16 states have return successors, (43), 17 states have call predecessors, (43), 25 states have call successors, (43) Word has length 701 [2022-12-14 10:01:20,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:01:20,747 INFO L225 Difference]: With dead ends: 303 [2022-12-14 10:01:20,747 INFO L226 Difference]: Without dead ends: 279 [2022-12-14 10:01:20,748 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1432 GetRequests, 1380 SyntacticMatches, 9 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 672 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=388, Invalid=1592, Unknown=0, NotChecked=0, Total=1980 [2022-12-14 10:01:20,748 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 106 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 465 mSolverCounterSat, 255 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 158 SdHoareTripleChecker+Invalid, 720 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 255 IncrementalHoareTripleChecker+Valid, 465 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 10:01:20,748 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [114 Valid, 158 Invalid, 720 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [255 Valid, 465 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 10:01:20,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2022-12-14 10:01:20,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 264. [2022-12-14 10:01:20,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 264 states, 180 states have (on average 1.1222222222222222) internal successors, (202), 174 states have internal predecessors, (202), 51 states have call successors, (51), 32 states have call predecessors, (51), 32 states have return successors, (263), 57 states have call predecessors, (263), 51 states have call successors, (263) [2022-12-14 10:01:20,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 264 states to 264 states and 516 transitions. [2022-12-14 10:01:20,769 INFO L78 Accepts]: Start accepts. Automaton has 264 states and 516 transitions. Word has length 701 [2022-12-14 10:01:20,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:01:20,769 INFO L495 AbstractCegarLoop]: Abstraction has 264 states and 516 transitions. [2022-12-14 10:01:20,769 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 28 states have (on average 3.5) internal successors, (98), 30 states have internal predecessors, (98), 25 states have call successors, (30), 1 states have call predecessors, (30), 16 states have return successors, (43), 17 states have call predecessors, (43), 25 states have call successors, (43) [2022-12-14 10:01:20,769 INFO L276 IsEmpty]: Start isEmpty. Operand 264 states and 516 transitions. [2022-12-14 10:01:20,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1734 [2022-12-14 10:01:20,787 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:01:20,787 INFO L195 NwaCegarLoop]: trace histogram [128, 128, 127, 127, 104, 96, 64, 64, 64, 64, 64, 64, 64, 63, 63, 63, 63, 63, 63, 63, 41, 32, 31, 24, 1, 1, 1, 1, 1, 1] [2022-12-14 10:01:20,802 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-12-14 10:01:20,988 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-12-14 10:01:20,988 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:01:20,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:01:20,989 INFO L85 PathProgramCache]: Analyzing trace with hash -1453386420, now seen corresponding path program 8 times [2022-12-14 10:01:20,989 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:01:20,989 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1441382292] [2022-12-14 10:01:20,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:01:20,990 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:01:21,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:01:23,834 INFO L134 CoverageAnalysis]: Checked inductivity of 90308 backedges. 882 proven. 4581 refuted. 0 times theorem prover too weak. 84845 trivial. 0 not checked. [2022-12-14 10:01:23,834 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:01:23,835 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1441382292] [2022-12-14 10:01:23,835 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1441382292] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:01:23,835 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [982091750] [2022-12-14 10:01:23,835 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 10:01:23,835 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:01:23,835 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:01:23,836 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:01:23,837 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-12-14 10:01:24,059 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-12-14 10:01:24,060 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 10:01:24,061 INFO L263 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 8 conjunts are in the unsatisfiable core [2022-12-14 10:01:24,078 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:01:24,186 INFO L134 CoverageAnalysis]: Checked inductivity of 90308 backedges. 6938 proven. 6 refuted. 0 times theorem prover too weak. 83364 trivial. 0 not checked. [2022-12-14 10:01:24,187 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:01:26,649 INFO L134 CoverageAnalysis]: Checked inductivity of 90308 backedges. 3612 proven. 54 refuted. 0 times theorem prover too weak. 86642 trivial. 0 not checked. [2022-12-14 10:01:26,649 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [982091750] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:01:26,649 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [819274967] [2022-12-14 10:01:26,650 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-12-14 10:01:26,650 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:01:26,651 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:01:26,651 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:01:26,651 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 9, 9] total 22 [2022-12-14 10:01:26,651 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1267288052] [2022-12-14 10:01:26,651 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:01:26,652 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-12-14 10:01:26,652 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:01:26,653 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-12-14 10:01:26,653 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=399, Unknown=0, NotChecked=0, Total=462 [2022-12-14 10:01:26,653 INFO L87 Difference]: Start difference. First operand 264 states and 516 transitions. Second operand has 22 states, 21 states have (on average 4.0476190476190474) internal successors, (85), 22 states have internal predecessors, (85), 15 states have call successors, (24), 2 states have call predecessors, (24), 13 states have return successors, (33), 12 states have call predecessors, (33), 15 states have call successors, (33) [2022-12-14 10:01:27,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:01:27,163 INFO L93 Difference]: Finished difference Result 642 states and 1550 transitions. [2022-12-14 10:01:27,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-12-14 10:01:27,164 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 4.0476190476190474) internal successors, (85), 22 states have internal predecessors, (85), 15 states have call successors, (24), 2 states have call predecessors, (24), 13 states have return successors, (33), 12 states have call predecessors, (33), 15 states have call successors, (33) Word has length 1733 [2022-12-14 10:01:27,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:01:27,168 INFO L225 Difference]: With dead ends: 642 [2022-12-14 10:01:27,168 INFO L226 Difference]: Without dead ends: 378 [2022-12-14 10:01:27,170 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3507 GetRequests, 3459 SyntacticMatches, 4 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 386 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=353, Invalid=1717, Unknown=0, NotChecked=0, Total=2070 [2022-12-14 10:01:27,171 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 126 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 810 mSolverCounterSat, 152 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 127 SdHoareTripleChecker+Valid, 190 SdHoareTripleChecker+Invalid, 962 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 152 IncrementalHoareTripleChecker+Valid, 810 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 10:01:27,171 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [127 Valid, 190 Invalid, 962 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [152 Valid, 810 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 10:01:27,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 378 states. [2022-12-14 10:01:27,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 378 to 298. [2022-12-14 10:01:27,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 298 states, 206 states have (on average 1.1359223300970873) internal successors, (234), 199 states have internal predecessors, (234), 59 states have call successors, (59), 41 states have call predecessors, (59), 32 states have return successors, (299), 57 states have call predecessors, (299), 59 states have call successors, (299) [2022-12-14 10:01:27,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 592 transitions. [2022-12-14 10:01:27,191 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 592 transitions. Word has length 1733 [2022-12-14 10:01:27,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:01:27,191 INFO L495 AbstractCegarLoop]: Abstraction has 298 states and 592 transitions. [2022-12-14 10:01:27,192 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 4.0476190476190474) internal successors, (85), 22 states have internal predecessors, (85), 15 states have call successors, (24), 2 states have call predecessors, (24), 13 states have return successors, (33), 12 states have call predecessors, (33), 15 states have call successors, (33) [2022-12-14 10:01:27,192 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 592 transitions. [2022-12-14 10:01:27,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1359 [2022-12-14 10:01:27,203 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:01:27,203 INFO L195 NwaCegarLoop]: trace histogram [100, 100, 99, 99, 81, 80, 50, 50, 50, 50, 50, 50, 50, 49, 49, 49, 49, 49, 49, 49, 32, 30, 19, 19, 1, 1, 1, 1, 1, 1] [2022-12-14 10:01:27,209 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2022-12-14 10:01:27,404 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-12-14 10:01:27,405 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:01:27,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:01:27,406 INFO L85 PathProgramCache]: Analyzing trace with hash -719138158, now seen corresponding path program 9 times [2022-12-14 10:01:27,407 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:01:27,407 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1332576652] [2022-12-14 10:01:27,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:01:27,408 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:01:27,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:01:29,697 INFO L134 CoverageAnalysis]: Checked inductivity of 55208 backedges. 635 proven. 4663 refuted. 0 times theorem prover too weak. 49910 trivial. 0 not checked. [2022-12-14 10:01:29,697 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:01:29,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1332576652] [2022-12-14 10:01:29,697 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1332576652] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:01:29,697 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1483260924] [2022-12-14 10:01:29,697 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 10:01:29,697 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:01:29,697 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:01:29,698 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:01:29,699 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-12-14 10:01:30,011 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 10:01:30,011 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 10:01:30,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 2416 conjuncts, 34 conjunts are in the unsatisfiable core [2022-12-14 10:01:30,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:01:30,288 INFO L134 CoverageAnalysis]: Checked inductivity of 55208 backedges. 27807 proven. 3302 refuted. 0 times theorem prover too weak. 24099 trivial. 0 not checked. [2022-12-14 10:01:30,288 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:01:36,049 INFO L134 CoverageAnalysis]: Checked inductivity of 55208 backedges. 2174 proven. 6761 refuted. 0 times theorem prover too weak. 46273 trivial. 0 not checked. [2022-12-14 10:01:36,050 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1483260924] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:01:36,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [253187404] [2022-12-14 10:01:36,051 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-12-14 10:01:36,051 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:01:36,051 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:01:36,052 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:01:36,052 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23, 35] total 42 [2022-12-14 10:01:36,052 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1222019913] [2022-12-14 10:01:36,052 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:01:36,053 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-12-14 10:01:36,053 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:01:36,054 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-12-14 10:01:36,054 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=1553, Unknown=0, NotChecked=0, Total=1722 [2022-12-14 10:01:36,054 INFO L87 Difference]: Start difference. First operand 298 states and 592 transitions. Second operand has 42 states, 41 states have (on average 3.658536585365854) internal successors, (150), 42 states have internal predecessors, (150), 38 states have call successors, (46), 2 states have call predecessors, (46), 20 states have return successors, (60), 19 states have call predecessors, (60), 38 states have call successors, (60) [2022-12-14 10:01:37,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:01:37,831 INFO L93 Difference]: Finished difference Result 668 states and 1601 transitions. [2022-12-14 10:01:37,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2022-12-14 10:01:37,831 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 41 states have (on average 3.658536585365854) internal successors, (150), 42 states have internal predecessors, (150), 38 states have call successors, (46), 2 states have call predecessors, (46), 20 states have return successors, (60), 19 states have call predecessors, (60), 38 states have call successors, (60) Word has length 1358 [2022-12-14 10:01:37,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:01:37,835 INFO L225 Difference]: With dead ends: 668 [2022-12-14 10:01:37,836 INFO L226 Difference]: Without dead ends: 350 [2022-12-14 10:01:37,839 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2782 GetRequests, 2680 SyntacticMatches, 17 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1818 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1042, Invalid=6440, Unknown=0, NotChecked=0, Total=7482 [2022-12-14 10:01:37,840 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 211 mSDsluCounter, 514 mSDsCounter, 0 mSdLazyCounter, 2724 mSolverCounterSat, 516 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 212 SdHoareTripleChecker+Valid, 560 SdHoareTripleChecker+Invalid, 3240 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 516 IncrementalHoareTripleChecker+Valid, 2724 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-12-14 10:01:37,840 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [212 Valid, 560 Invalid, 3240 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [516 Valid, 2724 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-12-14 10:01:37,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 350 states. [2022-12-14 10:01:37,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 350 to 267. [2022-12-14 10:01:37,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 267 states, 184 states have (on average 1.0978260869565217) internal successors, (202), 182 states have internal predecessors, (202), 55 states have call successors, (55), 37 states have call predecessors, (55), 27 states have return successors, (195), 47 states have call predecessors, (195), 55 states have call successors, (195) [2022-12-14 10:01:37,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 452 transitions. [2022-12-14 10:01:37,865 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 452 transitions. Word has length 1358 [2022-12-14 10:01:37,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:01:37,865 INFO L495 AbstractCegarLoop]: Abstraction has 267 states and 452 transitions. [2022-12-14 10:01:37,865 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 41 states have (on average 3.658536585365854) internal successors, (150), 42 states have internal predecessors, (150), 38 states have call successors, (46), 2 states have call predecessors, (46), 20 states have return successors, (60), 19 states have call predecessors, (60), 38 states have call successors, (60) [2022-12-14 10:01:37,866 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 452 transitions. [2022-12-14 10:01:37,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1781 [2022-12-14 10:01:37,902 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:01:37,903 INFO L195 NwaCegarLoop]: trace histogram [132, 132, 129, 129, 106, 105, 66, 66, 66, 66, 66, 66, 66, 64, 64, 64, 64, 64, 64, 64, 42, 39, 26, 24, 1, 1, 1, 1, 1, 1] [2022-12-14 10:01:37,911 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-12-14 10:01:38,103 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-12-14 10:01:38,103 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:01:38,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:01:38,104 INFO L85 PathProgramCache]: Analyzing trace with hash -155419925, now seen corresponding path program 10 times [2022-12-14 10:01:38,104 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:01:38,105 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1608882783] [2022-12-14 10:01:38,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:01:38,105 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:01:38,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:01:41,227 INFO L134 CoverageAnalysis]: Checked inductivity of 95277 backedges. 1420 proven. 4904 refuted. 0 times theorem prover too weak. 88953 trivial. 0 not checked. [2022-12-14 10:01:41,227 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:01:41,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1608882783] [2022-12-14 10:01:41,227 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1608882783] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:01:41,228 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1282633152] [2022-12-14 10:01:41,228 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 10:01:41,228 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:01:41,228 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:01:41,229 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:01:41,229 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-12-14 10:01:41,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:01:41,744 INFO L263 TraceCheckSpWp]: Trace formula consists of 3977 conjuncts, 24 conjunts are in the unsatisfiable core [2022-12-14 10:01:41,755 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:01:41,910 INFO L134 CoverageAnalysis]: Checked inductivity of 95277 backedges. 918 proven. 6810 refuted. 0 times theorem prover too weak. 87549 trivial. 0 not checked. [2022-12-14 10:01:41,910 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:01:47,656 INFO L134 CoverageAnalysis]: Checked inductivity of 95277 backedges. 918 proven. 6880 refuted. 0 times theorem prover too weak. 87479 trivial. 0 not checked. [2022-12-14 10:01:47,656 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1282633152] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:01:47,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [338968092] [2022-12-14 10:01:47,657 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-12-14 10:01:47,658 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:01:47,658 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:01:47,658 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:01:47,659 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 16, 25] total 32 [2022-12-14 10:01:47,659 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [168566558] [2022-12-14 10:01:47,659 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:01:47,663 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-12-14 10:01:47,663 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:01:47,663 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-12-14 10:01:47,663 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=828, Unknown=0, NotChecked=0, Total=992 [2022-12-14 10:01:47,664 INFO L87 Difference]: Start difference. First operand 267 states and 452 transitions. Second operand has 32 states, 30 states have (on average 3.466666666666667) internal successors, (104), 32 states have internal predecessors, (104), 28 states have call successors, (32), 1 states have call predecessors, (32), 16 states have return successors, (45), 17 states have call predecessors, (45), 28 states have call successors, (45) [2022-12-14 10:01:48,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:01:48,077 INFO L93 Difference]: Finished difference Result 322 states and 620 transitions. [2022-12-14 10:01:48,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-12-14 10:01:48,077 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), 28 states have call successors, (32), 1 states have call predecessors, (32), 16 states have return successors, (45), 17 states have call predecessors, (45), 28 states have call successors, (45) Word has length 1780 [2022-12-14 10:01:48,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:01:48,096 INFO L225 Difference]: With dead ends: 322 [2022-12-14 10:01:48,096 INFO L226 Difference]: Without dead ends: 298 [2022-12-14 10:01:48,096 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3594 GetRequests, 3538 SyntacticMatches, 11 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 669 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=405, Invalid=1757, Unknown=0, NotChecked=0, Total=2162 [2022-12-14 10:01:48,097 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 60 mSDsluCounter, 180 mSDsCounter, 0 mSdLazyCounter, 645 mSolverCounterSat, 80 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 196 SdHoareTripleChecker+Invalid, 725 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 80 IncrementalHoareTripleChecker+Valid, 645 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 10:01:48,097 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [76 Valid, 196 Invalid, 725 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [80 Valid, 645 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 10:01:48,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2022-12-14 10:01:48,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 267. [2022-12-14 10:01:48,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 267 states, 184 states have (on average 1.0978260869565217) internal successors, (202), 182 states have internal predecessors, (202), 55 states have call successors, (55), 37 states have call predecessors, (55), 27 states have return successors, (181), 47 states have call predecessors, (181), 55 states have call successors, (181) [2022-12-14 10:01:48,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 438 transitions. [2022-12-14 10:01:48,115 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 438 transitions. Word has length 1780 [2022-12-14 10:01:48,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:01:48,116 INFO L495 AbstractCegarLoop]: Abstraction has 267 states and 438 transitions. [2022-12-14 10:01:48,116 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 30 states have (on average 3.466666666666667) internal successors, (104), 32 states have internal predecessors, (104), 28 states have call successors, (32), 1 states have call predecessors, (32), 16 states have return successors, (45), 17 states have call predecessors, (45), 28 states have call successors, (45) [2022-12-14 10:01:48,117 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 438 transitions. [2022-12-14 10:01:48,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6331 [2022-12-14 10:01:48,326 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:01:48,327 INFO L195 NwaCegarLoop]: trace histogram [478, 478, 451, 451, 388, 365, 239, 239, 239, 239, 239, 239, 239, 225, 225, 225, 225, 225, 225, 225, 163, 126, 90, 86, 1, 1, 1, 1, 1, 1] [2022-12-14 10:01:48,336 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-12-14 10:01:48,527 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-12-14 10:01:48,528 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:01:48,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:01:48,528 INFO L85 PathProgramCache]: Analyzing trace with hash 755562525, now seen corresponding path program 11 times [2022-12-14 10:01:48,528 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:01:48,529 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1156679273] [2022-12-14 10:01:48,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:01:48,529 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:01:50,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:02:47,999 INFO L134 CoverageAnalysis]: Checked inductivity of 1217984 backedges. 18595 proven. 24692 refuted. 0 times theorem prover too weak. 1174697 trivial. 0 not checked. [2022-12-14 10:02:47,999 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:02:47,999 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1156679273] [2022-12-14 10:02:48,000 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1156679273] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:02:48,000 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2146130731] [2022-12-14 10:02:48,000 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 10:02:48,000 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:02:48,000 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:02:48,001 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:02:48,001 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-12-14 10:02:48,609 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 38 check-sat command(s) [2022-12-14 10:02:48,610 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 10:02:48,617 INFO L263 TraceCheckSpWp]: Trace formula consists of 1439 conjuncts, 12 conjunts are in the unsatisfiable core [2022-12-14 10:02:48,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:02:48,821 INFO L134 CoverageAnalysis]: Checked inductivity of 1217984 backedges. 175796 proven. 62 refuted. 0 times theorem prover too weak. 1042126 trivial. 0 not checked. [2022-12-14 10:02:48,821 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:03:00,072 INFO L134 CoverageAnalysis]: Checked inductivity of 1217984 backedges. 19086 proven. 1175 refuted. 0 times theorem prover too weak. 1197723 trivial. 0 not checked. [2022-12-14 10:03:00,072 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2146130731] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:03:00,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1412873453] [2022-12-14 10:03:00,075 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-12-14 10:03:00,075 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:03:00,075 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:03:00,075 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:03:00,077 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 12, 13] total 35 [2022-12-14 10:03:00,077 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [628444067] [2022-12-14 10:03:00,077 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:03:00,080 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-12-14 10:03:00,080 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:03:00,080 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-12-14 10:03:00,081 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=1050, Unknown=0, NotChecked=0, Total=1190 [2022-12-14 10:03:00,081 INFO L87 Difference]: Start difference. First operand 267 states and 438 transitions. Second operand has 35 states, 35 states have (on average 3.5714285714285716) internal successors, (125), 35 states have internal predecessors, (125), 23 states have call successors, (40), 2 states have call predecessors, (40), 21 states have return successors, (58), 29 states have call predecessors, (58), 23 states have call successors, (58) [2022-12-14 10:03:01,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:03:01,457 INFO L93 Difference]: Finished difference Result 726 states and 1514 transitions. [2022-12-14 10:03:01,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2022-12-14 10:03:01,458 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 3.5714285714285716) internal successors, (125), 35 states have internal predecessors, (125), 23 states have call successors, (40), 2 states have call predecessors, (40), 21 states have return successors, (58), 29 states have call predecessors, (58), 23 states have call successors, (58) Word has length 6330 [2022-12-14 10:03:01,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:03:01,463 INFO L225 Difference]: With dead ends: 726 [2022-12-14 10:03:01,463 INFO L226 Difference]: Without dead ends: 457 [2022-12-14 10:03:01,466 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12742 GetRequests, 12656 SyntacticMatches, 6 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1874 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=866, Invalid=5776, Unknown=0, NotChecked=0, Total=6642 [2022-12-14 10:03:01,466 INFO L413 NwaCegarLoop]: 72 mSDtfsCounter, 185 mSDsluCounter, 565 mSDsCounter, 0 mSdLazyCounter, 2363 mSolverCounterSat, 418 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 185 SdHoareTripleChecker+Valid, 637 SdHoareTripleChecker+Invalid, 2781 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 418 IncrementalHoareTripleChecker+Valid, 2363 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-12-14 10:03:01,467 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [185 Valid, 637 Invalid, 2781 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [418 Valid, 2363 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-12-14 10:03:01,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 457 states. [2022-12-14 10:03:01,489 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 457 to 390. [2022-12-14 10:03:01,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 390 states, 272 states have (on average 1.0588235294117647) internal successors, (288), 268 states have internal predecessors, (288), 83 states have call successors, (83), 59 states have call predecessors, (83), 34 states have return successors, (278), 62 states have call predecessors, (278), 83 states have call successors, (278) [2022-12-14 10:03:01,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 390 states to 390 states and 649 transitions. [2022-12-14 10:03:01,492 INFO L78 Accepts]: Start accepts. Automaton has 390 states and 649 transitions. Word has length 6330 [2022-12-14 10:03:01,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:03:01,493 INFO L495 AbstractCegarLoop]: Abstraction has 390 states and 649 transitions. [2022-12-14 10:03:01,493 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 3.5714285714285716) internal successors, (125), 35 states have internal predecessors, (125), 23 states have call successors, (40), 2 states have call predecessors, (40), 21 states have return successors, (58), 29 states have call predecessors, (58), 23 states have call successors, (58) [2022-12-14 10:03:01,493 INFO L276 IsEmpty]: Start isEmpty. Operand 390 states and 649 transitions. [2022-12-14 10:03:01,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8902 [2022-12-14 10:03:01,985 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:03:01,986 INFO L195 NwaCegarLoop]: trace histogram [674, 674, 633, 633, 535, 521, 337, 337, 337, 337, 337, 337, 337, 316, 316, 316, 316, 316, 316, 316, 219, 184, 139, 112, 1, 1, 1, 1, 1, 1] [2022-12-14 10:03:01,993 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2022-12-14 10:03:02,187 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:03:02,188 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:03:02,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:03:02,193 INFO L85 PathProgramCache]: Analyzing trace with hash -1336887632, now seen corresponding path program 12 times [2022-12-14 10:03:02,194 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:03:02,194 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2139794408] [2022-12-14 10:03:02,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:03:02,195 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:03:05,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:04:13,276 INFO L134 CoverageAnalysis]: Checked inductivity of 2411165 backedges. 4621 proven. 35410 refuted. 0 times theorem prover too weak. 2371134 trivial. 0 not checked. [2022-12-14 10:04:13,277 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:04:13,277 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2139794408] [2022-12-14 10:04:13,277 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2139794408] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:04:13,277 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1837179015] [2022-12-14 10:04:13,277 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 10:04:13,277 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:04:13,277 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:04:13,278 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:04:13,279 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-12-14 10:04:14,842 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 10:04:14,842 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 10:04:14,900 INFO L263 TraceCheckSpWp]: Trace formula consists of 15840 conjuncts, 22 conjunts are in the unsatisfiable core [2022-12-14 10:04:14,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:04:15,247 INFO L134 CoverageAnalysis]: Checked inductivity of 2411165 backedges. 136227 proven. 427 refuted. 0 times theorem prover too weak. 2274511 trivial. 0 not checked. [2022-12-14 10:04:15,247 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:04:33,791 INFO L134 CoverageAnalysis]: Checked inductivity of 2411165 backedges. 4765 proven. 46006 refuted. 0 times theorem prover too weak. 2360394 trivial. 0 not checked. [2022-12-14 10:04:33,791 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1837179015] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:04:33,791 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1386462942] [2022-12-14 10:04:33,793 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-12-14 10:04:33,793 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:04:33,793 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:04:33,794 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:04:33,796 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 17, 23] total 35 [2022-12-14 10:04:33,796 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1158924029] [2022-12-14 10:04:33,796 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:04:33,800 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-12-14 10:04:33,800 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:04:33,801 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-12-14 10:04:33,801 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1062, Unknown=0, NotChecked=0, Total=1190 [2022-12-14 10:04:33,801 INFO L87 Difference]: Start difference. First operand 390 states and 649 transitions. Second operand has 35 states, 34 states have (on average 3.7941176470588234) internal successors, (129), 35 states have internal predecessors, (129), 30 states have call successors, (40), 2 states have call predecessors, (40), 19 states have return successors, (54), 19 states have call predecessors, (54), 30 states have call successors, (54) [2022-12-14 10:04:35,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:04:35,124 INFO L93 Difference]: Finished difference Result 883 states and 1739 transitions. [2022-12-14 10:04:35,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 65 states. [2022-12-14 10:04:35,124 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 34 states have (on average 3.7941176470588234) internal successors, (129), 35 states have internal predecessors, (129), 30 states have call successors, (40), 2 states have call predecessors, (40), 19 states have return successors, (54), 19 states have call predecessors, (54), 30 states have call successors, (54) Word has length 8901 [2022-12-14 10:04:35,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:04:35,130 INFO L225 Difference]: With dead ends: 883 [2022-12-14 10:04:35,130 INFO L226 Difference]: Without dead ends: 515 [2022-12-14 10:04:35,133 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 17876 GetRequests, 17781 SyntacticMatches, 11 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1844 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1021, Invalid=6289, Unknown=0, NotChecked=0, Total=7310 [2022-12-14 10:04:35,134 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 275 mSDsluCounter, 303 mSDsCounter, 0 mSdLazyCounter, 1374 mSolverCounterSat, 596 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 276 SdHoareTripleChecker+Valid, 346 SdHoareTripleChecker+Invalid, 1970 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 596 IncrementalHoareTripleChecker+Valid, 1374 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-12-14 10:04:35,134 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [276 Valid, 346 Invalid, 1970 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [596 Valid, 1374 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-12-14 10:04:35,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 515 states. [2022-12-14 10:04:35,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 515 to 459. [2022-12-14 10:04:35,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 459 states, 323 states have (on average 1.0588235294117647) internal successors, (342), 318 states have internal predecessors, (342), 99 states have call successors, (99), 74 states have call predecessors, (99), 36 states have return successors, (351), 66 states have call predecessors, (351), 99 states have call successors, (351) [2022-12-14 10:04:35,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 459 states to 459 states and 792 transitions. [2022-12-14 10:04:35,182 INFO L78 Accepts]: Start accepts. Automaton has 459 states and 792 transitions. Word has length 8901 [2022-12-14 10:04:35,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:04:35,183 INFO L495 AbstractCegarLoop]: Abstraction has 459 states and 792 transitions. [2022-12-14 10:04:35,184 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 34 states have (on average 3.7941176470588234) internal successors, (129), 35 states have internal predecessors, (129), 30 states have call successors, (40), 2 states have call predecessors, (40), 19 states have return successors, (54), 19 states have call predecessors, (54), 30 states have call successors, (54) [2022-12-14 10:04:35,184 INFO L276 IsEmpty]: Start isEmpty. Operand 459 states and 792 transitions. [2022-12-14 10:04:35,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7951 [2022-12-14 10:04:35,537 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:04:35,538 INFO L195 NwaCegarLoop]: trace histogram [598, 598, 569, 569, 474, 471, 299, 299, 299, 299, 299, 299, 299, 284, 284, 284, 284, 284, 284, 284, 187, 175, 127, 95, 1, 1, 1, 1, 1, 1] [2022-12-14 10:04:35,560 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-12-14 10:04:35,739 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:04:35,740 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:04:35,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:04:35,747 INFO L85 PathProgramCache]: Analyzing trace with hash 1442871194, now seen corresponding path program 13 times [2022-12-14 10:04:35,747 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:04:35,748 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1995458712] [2022-12-14 10:04:35,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:04:35,749 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:04:38,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:05:33,930 INFO L134 CoverageAnalysis]: Checked inductivity of 1922130 backedges. 4790 proven. 30947 refuted. 0 times theorem prover too weak. 1886393 trivial. 0 not checked. [2022-12-14 10:05:33,930 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:05:33,930 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1995458712] [2022-12-14 10:05:33,930 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1995458712] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:05:33,930 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [392891841] [2022-12-14 10:05:33,931 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 10:05:33,931 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:05:33,931 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:05:33,931 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:05:33,933 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-12-14 10:05:35,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:05:35,921 INFO L263 TraceCheckSpWp]: Trace formula consists of 17676 conjuncts, 28 conjunts are in the unsatisfiable core [2022-12-14 10:05:35,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:05:36,240 INFO L134 CoverageAnalysis]: Checked inductivity of 1922130 backedges. 4278 proven. 38105 refuted. 0 times theorem prover too weak. 1879747 trivial. 0 not checked. [2022-12-14 10:05:36,240 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:05:54,171 INFO L134 CoverageAnalysis]: Checked inductivity of 1922130 backedges. 4278 proven. 38207 refuted. 0 times theorem prover too weak. 1879645 trivial. 0 not checked. [2022-12-14 10:05:54,171 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [392891841] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:05:54,171 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1618145514] [2022-12-14 10:05:54,174 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-12-14 10:05:54,174 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:05:54,174 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:05:54,174 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:05:54,177 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 18, 29] total 38 [2022-12-14 10:05:54,177 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1188115311] [2022-12-14 10:05:54,177 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:05:54,181 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-12-14 10:05:54,181 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:05:54,181 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-12-14 10:05:54,182 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=229, Invalid=1177, Unknown=0, NotChecked=0, Total=1406 [2022-12-14 10:05:54,182 INFO L87 Difference]: Start difference. First operand 459 states and 792 transitions. Second operand has 38 states, 36 states have (on average 3.388888888888889) internal successors, (122), 38 states have internal predecessors, (122), 34 states have call successors, (38), 1 states have call predecessors, (38), 20 states have return successors, (55), 21 states have call predecessors, (55), 34 states have call successors, (55) [2022-12-14 10:05:54,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:05:54,699 INFO L93 Difference]: Finished difference Result 530 states and 1057 transitions. [2022-12-14 10:05:54,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-12-14 10:05:54,700 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 36 states have (on average 3.388888888888889) internal successors, (122), 38 states have internal predecessors, (122), 34 states have call successors, (38), 1 states have call predecessors, (38), 20 states have return successors, (55), 21 states have call predecessors, (55), 34 states have call successors, (55) Word has length 7950 [2022-12-14 10:05:54,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:05:54,709 INFO L225 Difference]: With dead ends: 530 [2022-12-14 10:05:54,709 INFO L226 Difference]: Without dead ends: 506 [2022-12-14 10:05:54,710 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 15942 GetRequests, 15874 SyntacticMatches, 13 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1088 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=591, Invalid=2601, Unknown=0, NotChecked=0, Total=3192 [2022-12-14 10:05:54,711 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 163 mSDsluCounter, 184 mSDsCounter, 0 mSdLazyCounter, 689 mSolverCounterSat, 362 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 181 SdHoareTripleChecker+Valid, 200 SdHoareTripleChecker+Invalid, 1051 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 362 IncrementalHoareTripleChecker+Valid, 689 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 10:05:54,711 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [181 Valid, 200 Invalid, 1051 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [362 Valid, 689 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 10:05:54,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 506 states. [2022-12-14 10:05:54,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 506 to 491. [2022-12-14 10:05:54,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 491 states, 342 states have (on average 1.0555555555555556) internal successors, (361), 337 states have internal predecessors, (361), 106 states have call successors, (106), 74 states have call predecessors, (106), 42 states have return successors, (433), 79 states have call predecessors, (433), 106 states have call successors, (433) [2022-12-14 10:05:54,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 491 states to 491 states and 900 transitions. [2022-12-14 10:05:54,745 INFO L78 Accepts]: Start accepts. Automaton has 491 states and 900 transitions. Word has length 7950 [2022-12-14 10:05:54,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:05:54,746 INFO L495 AbstractCegarLoop]: Abstraction has 491 states and 900 transitions. [2022-12-14 10:05:54,746 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 36 states have (on average 3.388888888888889) internal successors, (122), 38 states have internal predecessors, (122), 34 states have call successors, (38), 1 states have call predecessors, (38), 20 states have return successors, (55), 21 states have call predecessors, (55), 34 states have call successors, (55) [2022-12-14 10:05:54,746 INFO L276 IsEmpty]: Start isEmpty. Operand 491 states and 900 transitions. [2022-12-14 10:05:55,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12622 [2022-12-14 10:05:55,598 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:05:55,600 INFO L195 NwaCegarLoop]: trace histogram [940, 940, 913, 913, 751, 749, 470, 470, 470, 470, 470, 470, 470, 456, 456, 456, 456, 456, 456, 456, 293, 281, 191, 162, 1, 1, 1, 1, 1, 1] [2022-12-14 10:05:55,625 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-12-14 10:05:55,801 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-12-14 10:05:55,801 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:05:55,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:05:55,810 INFO L85 PathProgramCache]: Analyzing trace with hash 632095239, now seen corresponding path program 14 times [2022-12-14 10:05:55,810 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:05:55,810 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1867776352] [2022-12-14 10:05:55,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:05:55,812 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:06:01,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:08:23,630 INFO L134 CoverageAnalysis]: Checked inductivity of 4848203 backedges. 10241 proven. 60804 refuted. 0 times theorem prover too weak. 4777158 trivial. 0 not checked. [2022-12-14 10:08:23,630 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:08:23,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1867776352] [2022-12-14 10:08:23,630 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1867776352] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:08:23,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1862038079] [2022-12-14 10:08:23,631 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 10:08:23,631 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:08:23,631 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:08:23,632 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:08:23,633 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-12-14 10:08:24,737 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 46 check-sat command(s) [2022-12-14 10:08:24,737 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 10:08:24,749 INFO L263 TraceCheckSpWp]: Trace formula consists of 1621 conjuncts, 16 conjunts are in the unsatisfiable core [2022-12-14 10:08:24,814 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 10:08:25,160 INFO L134 CoverageAnalysis]: Checked inductivity of 4848203 backedges. 379318 proven. 160 refuted. 0 times theorem prover too weak. 4468725 trivial. 0 not checked. [2022-12-14 10:08:25,160 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 10:08:49,193 INFO L134 CoverageAnalysis]: Checked inductivity of 4848203 backedges. 48798 proven. 1584 refuted. 0 times theorem prover too weak. 4797821 trivial. 0 not checked. [2022-12-14 10:08:49,193 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1862038079] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 10:08:49,193 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [874572853] [2022-12-14 10:08:49,197 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-12-14 10:08:49,197 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 10:08:49,197 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:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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) [2022-12-14 10:08:49,197 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 10:08:49,200 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 14, 17] total 30 [2022-12-14 10:08:49,200 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [879750931] [2022-12-14 10:08:49,200 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 10:08:49,204 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-12-14 10:08:49,204 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 10:08:49,205 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-12-14 10:08:49,205 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=764, Unknown=0, NotChecked=0, Total=870 [2022-12-14 10:08:49,205 INFO L87 Difference]: Start difference. First operand 491 states and 900 transitions. Second operand has 30 states, 30 states have (on average 3.8333333333333335) internal successors, (115), 30 states have internal predecessors, (115), 22 states have call successors, (38), 2 states have call predecessors, (38), 15 states have return successors, (51), 21 states have call predecessors, (51), 22 states have call successors, (51) [2022-12-14 10:08:50,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 10:08:50,033 INFO L93 Difference]: Finished difference Result 996 states and 2011 transitions. [2022-12-14 10:08:50,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-12-14 10:08:50,033 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 3.8333333333333335) internal successors, (115), 30 states have internal predecessors, (115), 22 states have call successors, (38), 2 states have call predecessors, (38), 15 states have return successors, (51), 21 states have call predecessors, (51), 22 states have call successors, (51) Word has length 12621 [2022-12-14 10:08:50,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 10:08:50,042 INFO L225 Difference]: With dead ends: 996 [2022-12-14 10:08:50,042 INFO L226 Difference]: Without dead ends: 536 [2022-12-14 10:08:50,047 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25295 GetRequests, 25227 SyntacticMatches, 8 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 886 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=594, Invalid=3188, Unknown=0, NotChecked=0, Total=3782 [2022-12-14 10:08:50,047 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 120 mSDsluCounter, 346 mSDsCounter, 0 mSdLazyCounter, 1125 mSolverCounterSat, 178 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 120 SdHoareTripleChecker+Valid, 388 SdHoareTripleChecker+Invalid, 1303 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 178 IncrementalHoareTripleChecker+Valid, 1125 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 10:08:50,048 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [120 Valid, 388 Invalid, 1303 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [178 Valid, 1125 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 10:08:50,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 536 states. [2022-12-14 10:08:50,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 536 to 492. [2022-12-14 10:08:50,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 492 states, 344 states have (on average 1.055232558139535) internal successors, (363), 338 states have internal predecessors, (363), 106 states have call successors, (106), 76 states have call predecessors, (106), 41 states have return successors, (421), 77 states have call predecessors, (421), 106 states have call successors, (421) [2022-12-14 10:08:50,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 492 states to 492 states and 890 transitions. [2022-12-14 10:08:50,097 INFO L78 Accepts]: Start accepts. Automaton has 492 states and 890 transitions. Word has length 12621 [2022-12-14 10:08:50,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 10:08:50,101 INFO L495 AbstractCegarLoop]: Abstraction has 492 states and 890 transitions. [2022-12-14 10:08:50,102 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 3.8333333333333335) internal successors, (115), 30 states have internal predecessors, (115), 22 states have call successors, (38), 2 states have call predecessors, (38), 15 states have return successors, (51), 21 states have call predecessors, (51), 22 states have call successors, (51) [2022-12-14 10:08:50,102 INFO L276 IsEmpty]: Start isEmpty. Operand 492 states and 890 transitions. [2022-12-14 10:08:51,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18735 [2022-12-14 10:08:51,934 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 10:08:51,936 INFO L195 NwaCegarLoop]: trace histogram [1380, 1380, 1371, 1371, 1129, 1096, 690, 690, 690, 690, 690, 690, 690, 685, 685, 685, 685, 685, 685, 685, 439, 411, 284, 242, 1, 1, 1, 1, 1, 1] [2022-12-14 10:08:51,944 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2022-12-14 10:08:52,136 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-12-14 10:08:52,137 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 10:08:52,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 10:08:52,145 INFO L85 PathProgramCache]: Analyzing trace with hash -1607355612, now seen corresponding path program 15 times [2022-12-14 10:08:52,146 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 10:08:52,146 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1626390477] [2022-12-14 10:08:52,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 10:08:52,148 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 10:09:12,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 10:15:02,063 INFO L134 CoverageAnalysis]: Checked inductivity of 10687296 backedges. 8513 proven. 100053 refuted. 0 times theorem prover too weak. 10578730 trivial. 0 not checked. [2022-12-14 10:15:02,063 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 10:15:02,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1626390477] [2022-12-14 10:15:02,064 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1626390477] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 10:15:02,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1198330190] [2022-12-14 10:15:02,064 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 10:15:02,064 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 10:15:02,064 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 10:15:02,065 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 10:15:02,066 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e34550cf-73f8-499b-b471-569318fd0a2c/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process