./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/elevator_spec3_product09.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc 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_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/elevator_spec3_product09.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh --witnessprinter.witness.filename witness --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 67b10dcf95f436cfd8f02a55d7d1d272656f1382a4eb6ab4ad3bba992e95e024 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 12:44:19,869 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 12:44:19,936 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 12:44:19,941 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 12:44:19,941 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 12:44:19,968 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 12:44:19,968 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 12:44:19,969 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 12:44:19,969 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 12:44:19,970 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 12:44:19,971 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 12:44:19,971 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 12:44:19,972 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 12:44:19,972 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 12:44:19,973 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 12:44:19,973 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 12:44:19,974 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 12:44:19,974 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 12:44:19,975 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 12:44:19,976 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 12:44:19,976 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 12:44:19,977 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 12:44:19,978 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 12:44:19,978 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 12:44:19,979 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 12:44:19,979 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 12:44:19,980 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 12:44:19,980 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 12:44:19,981 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 12:44:19,981 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 12:44:19,982 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 12:44:19,982 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 12:44:19,982 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 12:44:19,983 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 12:44:19,983 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 12:44:19,983 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 12:44:19,983 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 12:44:19,983 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 12:44:19,984 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 12:44:19,984 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 12:44:19,984 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 12:44:19,984 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 12:44:19,985 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 12:44:19,985 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 12:44:19,985 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 12:44:19,985 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 12:44:19,985 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 12:44:19,986 INFO L153 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 67b10dcf95f436cfd8f02a55d7d1d272656f1382a4eb6ab4ad3bba992e95e024 [2023-12-02 12:44:20,223 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 12:44:20,247 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 12:44:20,250 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 12:44:20,252 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 12:44:20,252 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 12:44:20,254 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/product-lines/elevator_spec3_product09.cil.c [2023-12-02 12:44:23,313 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 12:44:23,682 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 12:44:23,683 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/sv-benchmarks/c/product-lines/elevator_spec3_product09.cil.c [2023-12-02 12:44:23,706 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/data/325ffc975/a02bc01551e041dabb1d6b64836a71b4/FLAG6f1715edb [2023-12-02 12:44:23,721 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/data/325ffc975/a02bc01551e041dabb1d6b64836a71b4 [2023-12-02 12:44:23,724 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 12:44:23,725 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 12:44:23,727 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 12:44:23,727 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 12:44:23,733 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 12:44:23,734 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 12:44:23" (1/1) ... [2023-12-02 12:44:23,735 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@28815057 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:44:23, skipping insertion in model container [2023-12-02 12:44:23,735 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 12:44:23" (1/1) ... [2023-12-02 12:44:23,800 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 12:44:24,081 WARN L240 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_07c30354-95ee-4f92-80d9-27e3f94e9732/sv-benchmarks/c/product-lines/elevator_spec3_product09.cil.c[21710,21723] [2023-12-02 12:44:24,263 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 12:44:24,277 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 12:44:24,289 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"UnitTests.i","") [48] [2023-12-02 12:44:24,291 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"scenario.i","") [147] [2023-12-02 12:44:24,291 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Floor.i","") [165] [2023-12-02 12:44:24,292 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Person.i","") [832] [2023-12-02 12:44:24,292 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"wsllib_check.i","") [952] [2023-12-02 12:44:24,292 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Elevator.i","") [961] [2023-12-02 12:44:24,292 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"featureselect.i","") [2404] [2023-12-02 12:44:24,292 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Test.i","") [2442] [2023-12-02 12:44:24,293 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Specification3_spec.i","") [2790] [2023-12-02 12:44:24,293 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"libacc.i","") [2976] [2023-12-02 12:44:24,325 WARN L240 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_07c30354-95ee-4f92-80d9-27e3f94e9732/sv-benchmarks/c/product-lines/elevator_spec3_product09.cil.c[21710,21723] [2023-12-02 12:44:24,407 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 12:44:24,439 INFO L206 MainTranslator]: Completed translation [2023-12-02 12:44:24,439 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:44:24 WrapperNode [2023-12-02 12:44:24,439 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 12:44:24,440 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 12:44:24,440 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 12:44:24,441 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 12:44:24,447 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:44:24" (1/1) ... [2023-12-02 12:44:24,481 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:44:24" (1/1) ... [2023-12-02 12:44:24,539 INFO L138 Inliner]: procedures = 87, calls = 336, calls flagged for inlining = 23, calls inlined = 20, statements flattened = 807 [2023-12-02 12:44:24,539 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 12:44:24,540 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 12:44:24,540 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 12:44:24,541 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 12:44:24,552 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:44:24" (1/1) ... [2023-12-02 12:44:24,552 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:44:24" (1/1) ... [2023-12-02 12:44:24,560 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:44:24" (1/1) ... [2023-12-02 12:44:24,560 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:44:24" (1/1) ... [2023-12-02 12:44:24,587 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:44:24" (1/1) ... [2023-12-02 12:44:24,606 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:44:24" (1/1) ... [2023-12-02 12:44:24,612 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:44:24" (1/1) ... [2023-12-02 12:44:24,620 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:44:24" (1/1) ... [2023-12-02 12:44:24,631 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 12:44:24,632 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 12:44:24,632 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 12:44:24,632 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 12:44:24,633 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:44:24" (1/1) ... [2023-12-02 12:44:24,640 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 12:44:24,659 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:44:24,673 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 12:44:24,684 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 12:44:24,721 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 12:44:24,722 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentHeading [2023-12-02 12:44:24,722 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentHeading [2023-12-02 12:44:24,722 INFO L130 BoogieDeclarations]: Found specification of procedure enterElevator [2023-12-02 12:44:24,722 INFO L138 BoogieDeclarations]: Found implementation of procedure enterElevator [2023-12-02 12:44:24,722 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection [2023-12-02 12:44:24,723 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection [2023-12-02 12:44:24,723 INFO L130 BoogieDeclarations]: Found specification of procedure bobCall [2023-12-02 12:44:24,723 INFO L138 BoogieDeclarations]: Found implementation of procedure bobCall [2023-12-02 12:44:24,723 INFO L130 BoogieDeclarations]: Found specification of procedure getReverseHeading [2023-12-02 12:44:24,723 INFO L138 BoogieDeclarations]: Found implementation of procedure getReverseHeading [2023-12-02 12:44:24,723 INFO L130 BoogieDeclarations]: Found specification of procedure cleanup [2023-12-02 12:44:24,724 INFO L138 BoogieDeclarations]: Found implementation of procedure cleanup [2023-12-02 12:44:24,724 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift [2023-12-02 12:44:24,724 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift [2023-12-02 12:44:24,724 INFO L130 BoogieDeclarations]: Found specification of procedure __automaton_fail [2023-12-02 12:44:24,724 INFO L138 BoogieDeclarations]: Found implementation of procedure __automaton_fail [2023-12-02 12:44:24,725 INFO L130 BoogieDeclarations]: Found specification of procedure isTopFloor [2023-12-02 12:44:24,725 INFO L138 BoogieDeclarations]: Found implementation of procedure isTopFloor [2023-12-02 12:44:24,725 INFO L130 BoogieDeclarations]: Found specification of procedure getDestination [2023-12-02 12:44:24,725 INFO L138 BoogieDeclarations]: Found implementation of procedure getDestination [2023-12-02 12:44:24,725 INFO L130 BoogieDeclarations]: Found specification of procedure isBlocked [2023-12-02 12:44:24,725 INFO L138 BoogieDeclarations]: Found implementation of procedure isBlocked [2023-12-02 12:44:24,726 INFO L130 BoogieDeclarations]: Found specification of procedure initTopDown [2023-12-02 12:44:24,726 INFO L138 BoogieDeclarations]: Found implementation of procedure initTopDown [2023-12-02 12:44:24,726 INFO L130 BoogieDeclarations]: Found specification of procedure resetCallOnFloor [2023-12-02 12:44:24,726 INFO L138 BoogieDeclarations]: Found implementation of procedure resetCallOnFloor [2023-12-02 12:44:24,726 INFO L130 BoogieDeclarations]: Found specification of procedure initFloors [2023-12-02 12:44:24,726 INFO L138 BoogieDeclarations]: Found implementation of procedure initFloors [2023-12-02 12:44:24,727 INFO L130 BoogieDeclarations]: Found specification of procedure initPersonOnFloor [2023-12-02 12:44:24,727 INFO L138 BoogieDeclarations]: Found implementation of procedure initPersonOnFloor [2023-12-02 12:44:24,727 INFO L130 BoogieDeclarations]: Found specification of procedure removePersonFromFloor [2023-12-02 12:44:24,727 INFO L138 BoogieDeclarations]: Found implementation of procedure removePersonFromFloor [2023-12-02 12:44:24,727 INFO L130 BoogieDeclarations]: Found specification of procedure getOrigin [2023-12-02 12:44:24,750 INFO L138 BoogieDeclarations]: Found implementation of procedure getOrigin [2023-12-02 12:44:24,750 INFO L130 BoogieDeclarations]: Found specification of procedure continueInDirection [2023-12-02 12:44:24,750 INFO L138 BoogieDeclarations]: Found implementation of procedure continueInDirection [2023-12-02 12:44:24,751 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 12:44:24,751 INFO L130 BoogieDeclarations]: Found specification of procedure buttonForFloorIsPressed [2023-12-02 12:44:24,751 INFO L138 BoogieDeclarations]: Found implementation of procedure buttonForFloorIsPressed [2023-12-02 12:44:24,751 INFO L130 BoogieDeclarations]: Found specification of procedure pressInLiftFloorButton [2023-12-02 12:44:24,751 INFO L138 BoogieDeclarations]: Found implementation of procedure pressInLiftFloorButton [2023-12-02 12:44:24,751 INFO L130 BoogieDeclarations]: Found specification of procedure leaveElevator [2023-12-02 12:44:24,751 INFO L138 BoogieDeclarations]: Found implementation of procedure leaveElevator [2023-12-02 12:44:24,751 INFO L130 BoogieDeclarations]: Found specification of procedure isPersonOnFloor [2023-12-02 12:44:24,752 INFO L138 BoogieDeclarations]: Found implementation of procedure isPersonOnFloor [2023-12-02 12:44:24,752 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 12:44:24,752 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 12:44:24,752 INFO L130 BoogieDeclarations]: Found specification of procedure isFloorCalling [2023-12-02 12:44:24,752 INFO L138 BoogieDeclarations]: Found implementation of procedure isFloorCalling [2023-12-02 12:44:24,928 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 12:44:24,931 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 12:44:26,037 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 12:44:26,735 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 12:44:26,736 INFO L309 CfgBuilder]: Removed 1 assume(true) statements. [2023-12-02 12:44:26,738 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 12:44:26 BoogieIcfgContainer [2023-12-02 12:44:26,738 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 12:44:26,741 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 12:44:26,741 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 12:44:26,744 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 12:44:26,744 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 12:44:23" (1/3) ... [2023-12-02 12:44:26,745 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@30bf1c86 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 12:44:26, skipping insertion in model container [2023-12-02 12:44:26,745 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 12:44:24" (2/3) ... [2023-12-02 12:44:26,745 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@30bf1c86 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 12:44:26, skipping insertion in model container [2023-12-02 12:44:26,745 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 12:44:26" (3/3) ... [2023-12-02 12:44:26,747 INFO L112 eAbstractionObserver]: Analyzing ICFG elevator_spec3_product09.cil.c [2023-12-02 12:44:26,765 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 12:44:26,765 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-02 12:44:26,823 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 12:44:26,828 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=LoopHeads, 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;@2bfc629c, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 12:44:26,829 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-02 12:44:26,835 INFO L276 IsEmpty]: Start isEmpty. Operand has 377 states, 254 states have (on average 1.5984251968503937) internal successors, (406), 272 states have internal predecessors, (406), 98 states have call successors, (98), 23 states have call predecessors, (98), 23 states have return successors, (98), 95 states have call predecessors, (98), 98 states have call successors, (98) [2023-12-02 12:44:26,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2023-12-02 12:44:26,854 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:44:26,855 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:44:26,856 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:44:26,860 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:44:26,861 INFO L85 PathProgramCache]: Analyzing trace with hash 1665794326, now seen corresponding path program 1 times [2023-12-02 12:44:26,869 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:44:26,869 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1610940501] [2023-12-02 12:44:26,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:44:26,870 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:44:27,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:44:27,578 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 12:44:27,578 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:44:27,579 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1610940501] [2023-12-02 12:44:27,580 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1610940501] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:44:27,580 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 12:44:27,580 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 12:44:27,582 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1216079663] [2023-12-02 12:44:27,583 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:44:27,587 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 12:44:27,588 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:44:27,620 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 12:44:27,621 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 12:44:27,625 INFO L87 Difference]: Start difference. First operand has 377 states, 254 states have (on average 1.5984251968503937) internal successors, (406), 272 states have internal predecessors, (406), 98 states have call successors, (98), 23 states have call predecessors, (98), 23 states have return successors, (98), 95 states have call predecessors, (98), 98 states have call successors, (98) Second operand has 4 states, 4 states have (on average 10.0) internal successors, (40), 4 states have internal predecessors, (40), 4 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2023-12-02 12:44:28,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:44:28,209 INFO L93 Difference]: Finished difference Result 1056 states and 1711 transitions. [2023-12-02 12:44:28,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 12:44:28,213 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 10.0) internal successors, (40), 4 states have internal predecessors, (40), 4 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) Word has length 63 [2023-12-02 12:44:28,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:44:28,234 INFO L225 Difference]: With dead ends: 1056 [2023-12-02 12:44:28,235 INFO L226 Difference]: Without dead ends: 681 [2023-12-02 12:44:28,246 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-12-02 12:44:28,251 INFO L413 NwaCegarLoop]: 600 mSDtfsCounter, 488 mSDsluCounter, 1090 mSDsCounter, 0 mSdLazyCounter, 287 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 488 SdHoareTripleChecker+Valid, 1690 SdHoareTripleChecker+Invalid, 325 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 287 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 12:44:28,252 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [488 Valid, 1690 Invalid, 325 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 287 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 12:44:28,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 681 states. [2023-12-02 12:44:28,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 681 to 675. [2023-12-02 12:44:28,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 675 states, 457 states have (on average 1.5229759299781183) internal successors, (696), 487 states have internal predecessors, (696), 178 states have call successors, (178), 43 states have call predecessors, (178), 39 states have return successors, (179), 169 states have call predecessors, (179), 174 states have call successors, (179) [2023-12-02 12:44:28,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 675 states to 675 states and 1053 transitions. [2023-12-02 12:44:28,385 INFO L78 Accepts]: Start accepts. Automaton has 675 states and 1053 transitions. Word has length 63 [2023-12-02 12:44:28,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:44:28,386 INFO L495 AbstractCegarLoop]: Abstraction has 675 states and 1053 transitions. [2023-12-02 12:44:28,386 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 10.0) internal successors, (40), 4 states have internal predecessors, (40), 4 states have call successors, (12), 3 states have call predecessors, (12), 2 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2023-12-02 12:44:28,387 INFO L276 IsEmpty]: Start isEmpty. Operand 675 states and 1053 transitions. [2023-12-02 12:44:28,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2023-12-02 12:44:28,392 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:44:28,392 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:44:28,393 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 12:44:28,393 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:44:28,394 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:44:28,394 INFO L85 PathProgramCache]: Analyzing trace with hash 1607558271, now seen corresponding path program 1 times [2023-12-02 12:44:28,394 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:44:28,394 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [623074303] [2023-12-02 12:44:28,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:44:28,395 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:44:28,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:44:28,731 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 12:44:28,731 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:44:28,732 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [623074303] [2023-12-02 12:44:28,732 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [623074303] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:44:28,732 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 12:44:28,732 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-12-02 12:44:28,733 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [417688982] [2023-12-02 12:44:28,733 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:44:28,735 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 12:44:28,735 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:44:28,736 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 12:44:28,737 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-12-02 12:44:28,737 INFO L87 Difference]: Start difference. First operand 675 states and 1053 transitions. Second operand has 4 states, 4 states have (on average 10.25) internal successors, (41), 4 states have internal predecessors, (41), 2 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2023-12-02 12:44:29,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:44:29,128 INFO L93 Difference]: Finished difference Result 1298 states and 2075 transitions. [2023-12-02 12:44:29,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 12:44:29,130 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 10.25) internal successors, (41), 4 states have internal predecessors, (41), 2 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) Word has length 68 [2023-12-02 12:44:29,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:44:29,139 INFO L225 Difference]: With dead ends: 1298 [2023-12-02 12:44:29,140 INFO L226 Difference]: Without dead ends: 865 [2023-12-02 12:44:29,144 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-12-02 12:44:29,146 INFO L413 NwaCegarLoop]: 577 mSDtfsCounter, 139 mSDsluCounter, 1127 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 90 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 1704 SdHoareTripleChecker+Invalid, 196 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 90 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 12:44:29,147 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [139 Valid, 1704 Invalid, 196 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [90 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 12:44:29,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 865 states. [2023-12-02 12:44:29,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 865 to 771. [2023-12-02 12:44:29,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 771 states, 507 states have (on average 1.514792899408284) internal successors, (768), 550 states have internal predecessors, (768), 223 states have call successors, (223), 43 states have call predecessors, (223), 40 states have return successors, (228), 214 states have call predecessors, (228), 219 states have call successors, (228) [2023-12-02 12:44:29,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 771 states to 771 states and 1219 transitions. [2023-12-02 12:44:29,216 INFO L78 Accepts]: Start accepts. Automaton has 771 states and 1219 transitions. Word has length 68 [2023-12-02 12:44:29,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:44:29,217 INFO L495 AbstractCegarLoop]: Abstraction has 771 states and 1219 transitions. [2023-12-02 12:44:29,217 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 10.25) internal successors, (41), 4 states have internal predecessors, (41), 2 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2023-12-02 12:44:29,217 INFO L276 IsEmpty]: Start isEmpty. Operand 771 states and 1219 transitions. [2023-12-02 12:44:29,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2023-12-02 12:44:29,220 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:44:29,221 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:44:29,221 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-12-02 12:44:29,221 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:44:29,222 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:44:29,222 INFO L85 PathProgramCache]: Analyzing trace with hash 1594280789, now seen corresponding path program 1 times [2023-12-02 12:44:29,222 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:44:29,222 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1401277716] [2023-12-02 12:44:29,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:44:29,222 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:44:29,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:44:29,585 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-12-02 12:44:29,585 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:44:29,585 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1401277716] [2023-12-02 12:44:29,586 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1401277716] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:44:29,586 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [784870790] [2023-12-02 12:44:29,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:44:29,586 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:44:29,587 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:44:29,588 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:44:29,596 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 12:44:29,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:44:29,984 INFO L262 TraceCheckSpWp]: Trace formula consists of 1530 conjuncts, 6 conjunts are in the unsatisfiable core [2023-12-02 12:44:29,997 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:44:30,178 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 12:44:30,179 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 12:44:30,179 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [784870790] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:44:30,180 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 12:44:30,180 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2023-12-02 12:44:30,180 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [71679517] [2023-12-02 12:44:30,181 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:44:30,181 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 12:44:30,181 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:44:30,182 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 12:44:30,183 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2023-12-02 12:44:30,183 INFO L87 Difference]: Start difference. First operand 771 states and 1219 transitions. Second operand has 5 states, 5 states have (on average 8.6) internal successors, (43), 5 states have internal predecessors, (43), 4 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) [2023-12-02 12:44:30,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:44:30,897 INFO L93 Difference]: Finished difference Result 1305 states and 2073 transitions. [2023-12-02 12:44:30,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 12:44:30,898 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 8.6) internal successors, (43), 5 states have internal predecessors, (43), 4 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) Word has length 72 [2023-12-02 12:44:30,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:44:30,906 INFO L225 Difference]: With dead ends: 1305 [2023-12-02 12:44:30,906 INFO L226 Difference]: Without dead ends: 779 [2023-12-02 12:44:30,909 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2023-12-02 12:44:30,911 INFO L413 NwaCegarLoop]: 620 mSDtfsCounter, 483 mSDsluCounter, 1016 mSDsCounter, 0 mSdLazyCounter, 462 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 490 SdHoareTripleChecker+Valid, 1636 SdHoareTripleChecker+Invalid, 467 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 462 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 12:44:30,912 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [490 Valid, 1636 Invalid, 467 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 462 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 12:44:30,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 779 states. [2023-12-02 12:44:30,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 779 to 775. [2023-12-02 12:44:30,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 775 states, 509 states have (on average 1.512770137524558) internal successors, (770), 553 states have internal predecessors, (770), 223 states have call successors, (223), 44 states have call predecessors, (223), 42 states have return successors, (229), 214 states have call predecessors, (229), 219 states have call successors, (229) [2023-12-02 12:44:30,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 775 states to 775 states and 1222 transitions. [2023-12-02 12:44:30,986 INFO L78 Accepts]: Start accepts. Automaton has 775 states and 1222 transitions. Word has length 72 [2023-12-02 12:44:30,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:44:30,987 INFO L495 AbstractCegarLoop]: Abstraction has 775 states and 1222 transitions. [2023-12-02 12:44:30,987 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 8.6) internal successors, (43), 5 states have internal predecessors, (43), 4 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 4 states have call successors, (13) [2023-12-02 12:44:30,987 INFO L276 IsEmpty]: Start isEmpty. Operand 775 states and 1222 transitions. [2023-12-02 12:44:30,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2023-12-02 12:44:30,989 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:44:30,990 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:44:30,998 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 12:44:31,190 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:44:31,191 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:44:31,192 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:44:31,192 INFO L85 PathProgramCache]: Analyzing trace with hash 62701401, now seen corresponding path program 1 times [2023-12-02 12:44:31,192 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:44:31,192 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [545948282] [2023-12-02 12:44:31,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:44:31,193 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:44:31,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:44:31,591 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-12-02 12:44:31,591 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:44:31,592 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [545948282] [2023-12-02 12:44:31,592 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [545948282] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:44:31,592 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1629554605] [2023-12-02 12:44:31,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:44:31,593 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:44:31,593 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:44:31,596 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:44:31,600 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 12:44:31,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:44:31,954 INFO L262 TraceCheckSpWp]: Trace formula consists of 1519 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 12:44:31,962 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:44:31,997 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 12:44:31,997 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 12:44:31,998 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1629554605] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:44:31,998 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 12:44:31,998 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2023-12-02 12:44:31,998 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [348701170] [2023-12-02 12:44:31,999 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:44:31,999 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 12:44:31,999 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:44:32,000 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 12:44:32,000 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2023-12-02 12:44:32,001 INFO L87 Difference]: Start difference. First operand 775 states and 1222 transitions. Second operand has 4 states, 4 states have (on average 11.5) internal successors, (46), 4 states have internal predecessors, (46), 2 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2023-12-02 12:44:32,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:44:32,294 INFO L93 Difference]: Finished difference Result 1404 states and 2250 transitions. [2023-12-02 12:44:32,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 12:44:32,295 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.5) internal successors, (46), 4 states have internal predecessors, (46), 2 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) Word has length 73 [2023-12-02 12:44:32,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:44:32,302 INFO L225 Difference]: With dead ends: 1404 [2023-12-02 12:44:32,303 INFO L226 Difference]: Without dead ends: 775 [2023-12-02 12:44:32,308 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2023-12-02 12:44:32,309 INFO L413 NwaCegarLoop]: 597 mSDtfsCounter, 266 mSDsluCounter, 946 mSDsCounter, 0 mSdLazyCounter, 160 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 277 SdHoareTripleChecker+Valid, 1543 SdHoareTripleChecker+Invalid, 182 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 160 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 12:44:32,310 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [277 Valid, 1543 Invalid, 182 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 160 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 12:44:32,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 775 states. [2023-12-02 12:44:32,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 775 to 775. [2023-12-02 12:44:32,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 775 states, 509 states have (on average 1.4852652259332024) internal successors, (756), 553 states have internal predecessors, (756), 223 states have call successors, (223), 44 states have call predecessors, (223), 42 states have return successors, (229), 214 states have call predecessors, (229), 219 states have call successors, (229) [2023-12-02 12:44:32,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 775 states to 775 states and 1208 transitions. [2023-12-02 12:44:32,376 INFO L78 Accepts]: Start accepts. Automaton has 775 states and 1208 transitions. Word has length 73 [2023-12-02 12:44:32,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:44:32,376 INFO L495 AbstractCegarLoop]: Abstraction has 775 states and 1208 transitions. [2023-12-02 12:44:32,377 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.5) internal successors, (46), 4 states have internal predecessors, (46), 2 states have call successors, (14), 2 states have call predecessors, (14), 3 states have return successors, (12), 2 states have call predecessors, (12), 2 states have call successors, (12) [2023-12-02 12:44:32,377 INFO L276 IsEmpty]: Start isEmpty. Operand 775 states and 1208 transitions. [2023-12-02 12:44:32,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2023-12-02 12:44:32,379 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:44:32,380 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:44:32,388 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 12:44:32,585 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:44:32,586 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:44:32,586 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:44:32,586 INFO L85 PathProgramCache]: Analyzing trace with hash -1253365990, now seen corresponding path program 1 times [2023-12-02 12:44:32,586 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:44:32,587 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [924484215] [2023-12-02 12:44:32,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:44:32,587 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:44:32,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:44:32,976 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 12:44:32,976 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:44:32,976 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [924484215] [2023-12-02 12:44:32,977 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [924484215] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:44:32,977 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1035315378] [2023-12-02 12:44:32,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:44:32,977 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:44:32,977 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:44:32,978 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:44:32,984 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 12:44:33,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:44:33,403 INFO L262 TraceCheckSpWp]: Trace formula consists of 1529 conjuncts, 17 conjunts are in the unsatisfiable core [2023-12-02 12:44:33,412 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:44:33,661 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 12:44:33,661 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:44:33,920 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 12:44:33,921 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1035315378] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 12:44:33,921 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 12:44:33,921 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [6, 9] total 16 [2023-12-02 12:44:33,921 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1309277054] [2023-12-02 12:44:33,921 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:44:33,922 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-12-02 12:44:33,922 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:44:33,923 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-12-02 12:44:33,923 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=203, Unknown=0, NotChecked=0, Total=240 [2023-12-02 12:44:33,923 INFO L87 Difference]: Start difference. First operand 775 states and 1208 transitions. Second operand has 9 states, 8 states have (on average 5.625) internal successors, (45), 8 states have internal predecessors, (45), 4 states have call successors, (15), 4 states have call predecessors, (15), 4 states have return successors, (13), 4 states have call predecessors, (13), 3 states have call successors, (13) [2023-12-02 12:44:37,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:44:37,000 INFO L93 Difference]: Finished difference Result 1882 states and 3026 transitions. [2023-12-02 12:44:37,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-12-02 12:44:37,001 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 5.625) internal successors, (45), 8 states have internal predecessors, (45), 4 states have call successors, (15), 4 states have call predecessors, (15), 4 states have return successors, (13), 4 states have call predecessors, (13), 3 states have call successors, (13) Word has length 75 [2023-12-02 12:44:37,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:44:37,014 INFO L225 Difference]: With dead ends: 1882 [2023-12-02 12:44:37,014 INFO L226 Difference]: Without dead ends: 1430 [2023-12-02 12:44:37,020 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=145, Invalid=725, Unknown=0, NotChecked=0, Total=870 [2023-12-02 12:44:37,021 INFO L413 NwaCegarLoop]: 604 mSDtfsCounter, 2802 mSDsluCounter, 1939 mSDsCounter, 0 mSdLazyCounter, 1774 mSolverCounterSat, 1258 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2881 SdHoareTripleChecker+Valid, 2543 SdHoareTripleChecker+Invalid, 3032 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1258 IncrementalHoareTripleChecker+Valid, 1774 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2023-12-02 12:44:37,021 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2881 Valid, 2543 Invalid, 3032 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1258 Valid, 1774 Invalid, 0 Unknown, 0 Unchecked, 2.6s Time] [2023-12-02 12:44:37,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1430 states. [2023-12-02 12:44:37,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1430 to 1183. [2023-12-02 12:44:37,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1183 states, 822 states have (on average 1.5036496350364963) internal successors, (1236), 869 states have internal predecessors, (1236), 288 states have call successors, (288), 73 states have call predecessors, (288), 72 states have return successors, (325), 276 states have call predecessors, (325), 283 states have call successors, (325) [2023-12-02 12:44:37,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1183 states to 1183 states and 1849 transitions. [2023-12-02 12:44:37,129 INFO L78 Accepts]: Start accepts. Automaton has 1183 states and 1849 transitions. Word has length 75 [2023-12-02 12:44:37,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:44:37,130 INFO L495 AbstractCegarLoop]: Abstraction has 1183 states and 1849 transitions. [2023-12-02 12:44:37,130 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 5.625) internal successors, (45), 8 states have internal predecessors, (45), 4 states have call successors, (15), 4 states have call predecessors, (15), 4 states have return successors, (13), 4 states have call predecessors, (13), 3 states have call successors, (13) [2023-12-02 12:44:37,130 INFO L276 IsEmpty]: Start isEmpty. Operand 1183 states and 1849 transitions. [2023-12-02 12:44:37,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2023-12-02 12:44:37,132 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:44:37,132 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:44:37,144 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-12-02 12:44:37,333 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:44:37,333 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:44:37,334 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:44:37,334 INFO L85 PathProgramCache]: Analyzing trace with hash 503907876, now seen corresponding path program 1 times [2023-12-02 12:44:37,334 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:44:37,334 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1545466778] [2023-12-02 12:44:37,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:44:37,334 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:44:37,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:44:37,738 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 12:44:37,739 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:44:37,739 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1545466778] [2023-12-02 12:44:37,739 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1545466778] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:44:37,739 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2000728599] [2023-12-02 12:44:37,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:44:37,739 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:44:37,739 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:44:37,741 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:44:37,744 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 12:44:38,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:44:38,039 INFO L262 TraceCheckSpWp]: Trace formula consists of 1530 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 12:44:38,043 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:44:38,104 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 12:44:38,104 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 12:44:38,104 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2000728599] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:44:38,104 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 12:44:38,104 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 12:44:38,104 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [911994290] [2023-12-02 12:44:38,105 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:44:38,105 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 12:44:38,105 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:44:38,106 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 12:44:38,106 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-12-02 12:44:38,106 INFO L87 Difference]: Start difference. First operand 1183 states and 1849 transitions. Second operand has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2023-12-02 12:44:38,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:44:38,363 INFO L93 Difference]: Finished difference Result 3386 states and 5439 transitions. [2023-12-02 12:44:38,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 12:44:38,363 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) Word has length 76 [2023-12-02 12:44:38,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:44:38,381 INFO L225 Difference]: With dead ends: 3386 [2023-12-02 12:44:38,381 INFO L226 Difference]: Without dead ends: 2215 [2023-12-02 12:44:38,389 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 77 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-12-02 12:44:38,390 INFO L413 NwaCegarLoop]: 778 mSDtfsCounter, 458 mSDsluCounter, 530 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 458 SdHoareTripleChecker+Valid, 1308 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:44:38,390 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [458 Valid, 1308 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 90 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 12:44:38,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2215 states. [2023-12-02 12:44:38,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2215 to 2159. [2023-12-02 12:44:38,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2159 states, 1510 states have (on average 1.5119205298013245) internal successors, (2283), 1605 states have internal predecessors, (2283), 512 states have call successors, (512), 131 states have call predecessors, (512), 136 states have return successors, (604), 494 states have call predecessors, (604), 507 states have call successors, (604) [2023-12-02 12:44:38,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2159 states to 2159 states and 3399 transitions. [2023-12-02 12:44:38,562 INFO L78 Accepts]: Start accepts. Automaton has 2159 states and 3399 transitions. Word has length 76 [2023-12-02 12:44:38,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:44:38,563 INFO L495 AbstractCegarLoop]: Abstraction has 2159 states and 3399 transitions. [2023-12-02 12:44:38,563 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 3 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2023-12-02 12:44:38,563 INFO L276 IsEmpty]: Start isEmpty. Operand 2159 states and 3399 transitions. [2023-12-02 12:44:38,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2023-12-02 12:44:38,567 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:44:38,567 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:44:38,575 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 12:44:38,775 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-12-02 12:44:38,776 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:44:38,776 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:44:38,776 INFO L85 PathProgramCache]: Analyzing trace with hash 1073560945, now seen corresponding path program 1 times [2023-12-02 12:44:38,776 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:44:38,776 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [616384760] [2023-12-02 12:44:38,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:44:38,777 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:44:38,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:44:39,018 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-12-02 12:44:39,019 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:44:39,019 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [616384760] [2023-12-02 12:44:39,019 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [616384760] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:44:39,019 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [434735296] [2023-12-02 12:44:39,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:44:39,020 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:44:39,020 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:44:39,021 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:44:39,024 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 12:44:39,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:44:39,352 INFO L262 TraceCheckSpWp]: Trace formula consists of 1519 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 12:44:39,357 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:44:39,421 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 12:44:39,421 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 12:44:39,422 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [434735296] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:44:39,422 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 12:44:39,422 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 12:44:39,422 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [624895154] [2023-12-02 12:44:39,422 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:44:39,423 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 12:44:39,423 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:44:39,423 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 12:44:39,424 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-12-02 12:44:39,424 INFO L87 Difference]: Start difference. First operand 2159 states and 3399 transitions. Second operand has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 3 states have call successors, (14), 3 states have call predecessors, (14), 3 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2023-12-02 12:44:39,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:44:39,858 INFO L93 Difference]: Finished difference Result 5054 states and 8065 transitions. [2023-12-02 12:44:39,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 12:44:39,859 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 3 states have call successors, (14), 3 states have call predecessors, (14), 3 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) Word has length 75 [2023-12-02 12:44:39,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:44:39,891 INFO L225 Difference]: With dead ends: 5054 [2023-12-02 12:44:39,891 INFO L226 Difference]: Without dead ends: 2907 [2023-12-02 12:44:39,910 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-12-02 12:44:39,911 INFO L413 NwaCegarLoop]: 547 mSDtfsCounter, 520 mSDsluCounter, 457 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 520 SdHoareTripleChecker+Valid, 1004 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:44:39,911 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [520 Valid, 1004 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 12:44:39,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2907 states. [2023-12-02 12:44:40,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2907 to 2863. [2023-12-02 12:44:40,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2863 states, 2015 states have (on average 1.5205955334987593) internal successors, (3064), 2142 states have internal predecessors, (3064), 667 states have call successors, (667), 170 states have call predecessors, (667), 180 states have return successors, (795), 646 states have call predecessors, (795), 662 states have call successors, (795) [2023-12-02 12:44:40,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2863 states to 2863 states and 4526 transitions. [2023-12-02 12:44:40,162 INFO L78 Accepts]: Start accepts. Automaton has 2863 states and 4526 transitions. Word has length 75 [2023-12-02 12:44:40,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:44:40,163 INFO L495 AbstractCegarLoop]: Abstraction has 2863 states and 4526 transitions. [2023-12-02 12:44:40,163 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 3 states have call successors, (14), 3 states have call predecessors, (14), 3 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) [2023-12-02 12:44:40,163 INFO L276 IsEmpty]: Start isEmpty. Operand 2863 states and 4526 transitions. [2023-12-02 12:44:40,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2023-12-02 12:44:40,166 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:44:40,167 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:44:40,175 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 12:44:40,375 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:44:40,375 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:44:40,375 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:44:40,376 INFO L85 PathProgramCache]: Analyzing trace with hash 1103674593, now seen corresponding path program 1 times [2023-12-02 12:44:40,376 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:44:40,376 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [453118590] [2023-12-02 12:44:40,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:44:40,376 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:44:40,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:44:40,771 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 12:44:40,772 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:44:40,772 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [453118590] [2023-12-02 12:44:40,772 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [453118590] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:44:40,772 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1857905958] [2023-12-02 12:44:40,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:44:40,772 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:44:40,773 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:44:40,774 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:44:40,776 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 12:44:41,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:44:41,136 INFO L262 TraceCheckSpWp]: Trace formula consists of 1546 conjuncts, 7 conjunts are in the unsatisfiable core [2023-12-02 12:44:41,142 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:44:41,264 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 12:44:41,264 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 12:44:41,264 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1857905958] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:44:41,264 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 12:44:41,264 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2023-12-02 12:44:41,264 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [551813899] [2023-12-02 12:44:41,265 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:44:41,265 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 12:44:41,265 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:44:41,266 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 12:44:41,266 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2023-12-02 12:44:41,266 INFO L87 Difference]: Start difference. First operand 2863 states and 4526 transitions. Second operand has 5 states, 5 states have (on average 9.4) internal successors, (47), 5 states have internal predecessors, (47), 4 states have call successors, (16), 3 states have call predecessors, (16), 4 states have return successors, (14), 3 states have call predecessors, (14), 4 states have call successors, (14) [2023-12-02 12:44:42,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:44:42,022 INFO L93 Difference]: Finished difference Result 5145 states and 8164 transitions. [2023-12-02 12:44:42,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 12:44:42,023 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 9.4) internal successors, (47), 5 states have internal predecessors, (47), 4 states have call successors, (16), 3 states have call predecessors, (16), 4 states have return successors, (14), 3 states have call predecessors, (14), 4 states have call successors, (14) Word has length 79 [2023-12-02 12:44:42,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:44:42,051 INFO L225 Difference]: With dead ends: 5145 [2023-12-02 12:44:42,051 INFO L226 Difference]: Without dead ends: 2871 [2023-12-02 12:44:42,065 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2023-12-02 12:44:42,066 INFO L413 NwaCegarLoop]: 653 mSDtfsCounter, 396 mSDsluCounter, 1670 mSDsCounter, 0 mSdLazyCounter, 355 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 396 SdHoareTripleChecker+Valid, 2323 SdHoareTripleChecker+Invalid, 361 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 355 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 12:44:42,066 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [396 Valid, 2323 Invalid, 361 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 355 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 12:44:42,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2871 states. [2023-12-02 12:44:42,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2871 to 2863. [2023-12-02 12:44:42,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2863 states, 2015 states have (on average 1.5205955334987593) internal successors, (3064), 2142 states have internal predecessors, (3064), 667 states have call successors, (667), 170 states have call predecessors, (667), 180 states have return successors, (791), 646 states have call predecessors, (791), 662 states have call successors, (791) [2023-12-02 12:44:42,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2863 states to 2863 states and 4522 transitions. [2023-12-02 12:44:42,325 INFO L78 Accepts]: Start accepts. Automaton has 2863 states and 4522 transitions. Word has length 79 [2023-12-02 12:44:42,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:44:42,325 INFO L495 AbstractCegarLoop]: Abstraction has 2863 states and 4522 transitions. [2023-12-02 12:44:42,326 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 9.4) internal successors, (47), 5 states have internal predecessors, (47), 4 states have call successors, (16), 3 states have call predecessors, (16), 4 states have return successors, (14), 3 states have call predecessors, (14), 4 states have call successors, (14) [2023-12-02 12:44:42,326 INFO L276 IsEmpty]: Start isEmpty. Operand 2863 states and 4522 transitions. [2023-12-02 12:44:42,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2023-12-02 12:44:42,330 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:44:42,330 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:44:42,338 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 12:44:42,531 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:44:42,531 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:44:42,531 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:44:42,532 INFO L85 PathProgramCache]: Analyzing trace with hash 1904341993, now seen corresponding path program 1 times [2023-12-02 12:44:42,532 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:44:42,532 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1828985039] [2023-12-02 12:44:42,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:44:42,532 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:44:42,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:44:42,874 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-12-02 12:44:42,874 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:44:42,875 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1828985039] [2023-12-02 12:44:42,875 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1828985039] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:44:42,875 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [930677019] [2023-12-02 12:44:42,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:44:42,875 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:44:42,875 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:44:42,876 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:44:42,884 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 12:44:43,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:44:43,212 INFO L262 TraceCheckSpWp]: Trace formula consists of 1618 conjuncts, 5 conjunts are in the unsatisfiable core [2023-12-02 12:44:43,216 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:44:43,252 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 12:44:43,252 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 12:44:43,252 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [930677019] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:44:43,252 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 12:44:43,253 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 9 [2023-12-02 12:44:43,253 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [234813013] [2023-12-02 12:44:43,253 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:44:43,254 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 12:44:43,254 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:44:43,254 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 12:44:43,255 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2023-12-02 12:44:43,255 INFO L87 Difference]: Start difference. First operand 2863 states and 4522 transitions. Second operand has 5 states, 5 states have (on average 11.4) internal successors, (57), 4 states have internal predecessors, (57), 2 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (18), 3 states have call predecessors, (18), 2 states have call successors, (18) [2023-12-02 12:44:43,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:44:43,603 INFO L93 Difference]: Finished difference Result 5394 states and 8643 transitions. [2023-12-02 12:44:43,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 12:44:43,604 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.4) internal successors, (57), 4 states have internal predecessors, (57), 2 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (18), 3 states have call predecessors, (18), 2 states have call successors, (18) Word has length 99 [2023-12-02 12:44:43,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:44:43,630 INFO L225 Difference]: With dead ends: 5394 [2023-12-02 12:44:43,630 INFO L226 Difference]: Without dead ends: 2971 [2023-12-02 12:44:43,644 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2023-12-02 12:44:43,645 INFO L413 NwaCegarLoop]: 558 mSDtfsCounter, 13 mSDsluCounter, 1646 mSDsCounter, 0 mSdLazyCounter, 143 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 2204 SdHoareTripleChecker+Invalid, 160 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 143 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 12:44:43,646 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 2204 Invalid, 160 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 143 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 12:44:43,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2971 states. [2023-12-02 12:44:43,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2971 to 2928. [2023-12-02 12:44:43,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2928 states, 2057 states have (on average 1.5119105493437044) internal successors, (3110), 2195 states have internal predecessors, (3110), 674 states have call successors, (674), 170 states have call predecessors, (674), 196 states have return successors, (860), 658 states have call predecessors, (860), 669 states have call successors, (860) [2023-12-02 12:44:43,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2928 states to 2928 states and 4644 transitions. [2023-12-02 12:44:43,889 INFO L78 Accepts]: Start accepts. Automaton has 2928 states and 4644 transitions. Word has length 99 [2023-12-02 12:44:43,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:44:43,890 INFO L495 AbstractCegarLoop]: Abstraction has 2928 states and 4644 transitions. [2023-12-02 12:44:43,890 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.4) internal successors, (57), 4 states have internal predecessors, (57), 2 states have call successors, (20), 2 states have call predecessors, (20), 3 states have return successors, (18), 3 states have call predecessors, (18), 2 states have call successors, (18) [2023-12-02 12:44:43,890 INFO L276 IsEmpty]: Start isEmpty. Operand 2928 states and 4644 transitions. [2023-12-02 12:44:43,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2023-12-02 12:44:43,898 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:44:43,898 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:44:43,907 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 12:44:44,099 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:44:44,099 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:44:44,099 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:44:44,099 INFO L85 PathProgramCache]: Analyzing trace with hash 1952649793, now seen corresponding path program 1 times [2023-12-02 12:44:44,100 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:44:44,100 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1048009405] [2023-12-02 12:44:44,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:44:44,100 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:44:44,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:44:44,475 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 19 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-12-02 12:44:44,475 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:44:44,475 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1048009405] [2023-12-02 12:44:44,475 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1048009405] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:44:44,475 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2055092055] [2023-12-02 12:44:44,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:44:44,475 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:44:44,476 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:44:44,477 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:44:44,479 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 12:44:44,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:44:44,862 INFO L262 TraceCheckSpWp]: Trace formula consists of 1848 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 12:44:44,867 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:44:44,924 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 41 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 12:44:44,924 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 12:44:44,924 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2055092055] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:44:44,925 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 12:44:44,925 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8] total 9 [2023-12-02 12:44:44,925 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [955447480] [2023-12-02 12:44:44,925 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:44:44,925 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 12:44:44,926 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:44:44,926 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 12:44:44,926 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2023-12-02 12:44:44,927 INFO L87 Difference]: Start difference. First operand 2928 states and 4644 transitions. Second operand has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 3 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (19), 3 states have call predecessors, (19), 3 states have call successors, (19) [2023-12-02 12:44:45,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:44:45,274 INFO L93 Difference]: Finished difference Result 6622 states and 10729 transitions. [2023-12-02 12:44:45,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 12:44:45,275 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 3 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (19), 3 states have call predecessors, (19), 3 states have call successors, (19) Word has length 117 [2023-12-02 12:44:45,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:44:45,312 INFO L225 Difference]: With dead ends: 6622 [2023-12-02 12:44:45,312 INFO L226 Difference]: Without dead ends: 3706 [2023-12-02 12:44:45,334 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2023-12-02 12:44:45,335 INFO L413 NwaCegarLoop]: 771 mSDtfsCounter, 526 mSDsluCounter, 461 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 526 SdHoareTripleChecker+Valid, 1232 SdHoareTripleChecker+Invalid, 92 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:44:45,335 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [526 Valid, 1232 Invalid, 92 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 12:44:45,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3706 states. [2023-12-02 12:44:45,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3706 to 3643. [2023-12-02 12:44:45,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3643 states, 2570 states have (on average 1.5140077821011673) internal successors, (3891), 2742 states have internal predecessors, (3891), 830 states have call successors, (830), 207 states have call predecessors, (830), 242 states have return successors, (1064), 813 states have call predecessors, (1064), 825 states have call successors, (1064) [2023-12-02 12:44:45,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3643 states to 3643 states and 5785 transitions. [2023-12-02 12:44:45,690 INFO L78 Accepts]: Start accepts. Automaton has 3643 states and 5785 transitions. Word has length 117 [2023-12-02 12:44:45,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:44:45,691 INFO L495 AbstractCegarLoop]: Abstraction has 3643 states and 5785 transitions. [2023-12-02 12:44:45,691 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 3 states have call successors, (21), 3 states have call predecessors, (21), 3 states have return successors, (19), 3 states have call predecessors, (19), 3 states have call successors, (19) [2023-12-02 12:44:45,691 INFO L276 IsEmpty]: Start isEmpty. Operand 3643 states and 5785 transitions. [2023-12-02 12:44:45,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2023-12-02 12:44:45,701 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:44:45,701 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:44:45,710 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 12:44:45,902 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:44:45,903 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:44:45,904 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:44:45,904 INFO L85 PathProgramCache]: Analyzing trace with hash -390045206, now seen corresponding path program 1 times [2023-12-02 12:44:45,904 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:44:45,904 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [930754782] [2023-12-02 12:44:45,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:44:45,904 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:44:45,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:44:46,262 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 22 proven. 3 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-12-02 12:44:46,262 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:44:46,263 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [930754782] [2023-12-02 12:44:46,263 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [930754782] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:44:46,263 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [919288930] [2023-12-02 12:44:46,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:44:46,263 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:44:46,263 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:44:46,264 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:44:46,267 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 12:44:46,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:44:46,669 INFO L262 TraceCheckSpWp]: Trace formula consists of 1860 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 12:44:46,675 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:44:46,731 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 49 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-12-02 12:44:46,732 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 12:44:46,732 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [919288930] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:44:46,732 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 12:44:46,732 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [8] total 9 [2023-12-02 12:44:46,732 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [583314290] [2023-12-02 12:44:46,733 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:44:46,733 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 12:44:46,733 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:44:46,734 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 12:44:46,734 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2023-12-02 12:44:46,734 INFO L87 Difference]: Start difference. First operand 3643 states and 5785 transitions. Second operand has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 states have internal predecessors, (73), 3 states have call successors, (22), 3 states have call predecessors, (22), 3 states have return successors, (20), 3 states have call predecessors, (20), 3 states have call successors, (20) [2023-12-02 12:44:47,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:44:47,099 INFO L93 Difference]: Finished difference Result 7330 states and 11833 transitions. [2023-12-02 12:44:47,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 12:44:47,100 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 states have internal predecessors, (73), 3 states have call successors, (22), 3 states have call predecessors, (22), 3 states have return successors, (20), 3 states have call predecessors, (20), 3 states have call successors, (20) Word has length 118 [2023-12-02 12:44:47,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:44:47,128 INFO L225 Difference]: With dead ends: 7330 [2023-12-02 12:44:47,128 INFO L226 Difference]: Without dead ends: 3699 [2023-12-02 12:44:47,144 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2023-12-02 12:44:47,144 INFO L413 NwaCegarLoop]: 948 mSDtfsCounter, 457 mSDsluCounter, 531 mSDsCounter, 0 mSdLazyCounter, 96 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 457 SdHoareTripleChecker+Valid, 1479 SdHoareTripleChecker+Invalid, 100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 96 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:44:47,145 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [457 Valid, 1479 Invalid, 100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 96 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 12:44:47,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3699 states. [2023-12-02 12:44:47,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3699 to 3643. [2023-12-02 12:44:47,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3643 states, 2570 states have (on average 1.5116731517509727) internal successors, (3885), 2742 states have internal predecessors, (3885), 830 states have call successors, (830), 207 states have call predecessors, (830), 242 states have return successors, (1064), 813 states have call predecessors, (1064), 825 states have call successors, (1064) [2023-12-02 12:44:47,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3643 states to 3643 states and 5779 transitions. [2023-12-02 12:44:47,432 INFO L78 Accepts]: Start accepts. Automaton has 3643 states and 5779 transitions. Word has length 118 [2023-12-02 12:44:47,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:44:47,432 INFO L495 AbstractCegarLoop]: Abstraction has 3643 states and 5779 transitions. [2023-12-02 12:44:47,433 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 3 states have internal predecessors, (73), 3 states have call successors, (22), 3 states have call predecessors, (22), 3 states have return successors, (20), 3 states have call predecessors, (20), 3 states have call successors, (20) [2023-12-02 12:44:47,433 INFO L276 IsEmpty]: Start isEmpty. Operand 3643 states and 5779 transitions. [2023-12-02 12:44:47,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2023-12-02 12:44:47,443 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:44:47,443 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:44:47,454 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-12-02 12:44:47,644 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:44:47,644 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:44:47,645 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:44:47,645 INFO L85 PathProgramCache]: Analyzing trace with hash 1563306231, now seen corresponding path program 1 times [2023-12-02 12:44:47,645 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:44:47,645 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1454268452] [2023-12-02 12:44:47,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:44:47,645 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:44:47,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:44:47,942 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 18 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-12-02 12:44:47,942 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:44:47,942 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1454268452] [2023-12-02 12:44:47,942 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1454268452] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:44:47,943 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2038219060] [2023-12-02 12:44:47,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:44:47,943 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:44:47,943 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:44:47,944 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:44:47,947 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 12:44:48,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:44:48,257 INFO L262 TraceCheckSpWp]: Trace formula consists of 1849 conjuncts, 8 conjunts are in the unsatisfiable core [2023-12-02 12:44:48,261 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:44:48,384 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 39 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-12-02 12:44:48,385 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 12:44:48,385 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2038219060] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:44:48,385 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 12:44:48,385 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [8] total 14 [2023-12-02 12:44:48,385 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [529393100] [2023-12-02 12:44:48,385 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:44:48,386 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 12:44:48,386 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:44:48,386 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 12:44:48,387 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2023-12-02 12:44:48,387 INFO L87 Difference]: Start difference. First operand 3643 states and 5779 transitions. Second operand has 8 states, 7 states have (on average 10.571428571428571) internal successors, (74), 7 states have internal predecessors, (74), 5 states have call successors, (21), 4 states have call predecessors, (21), 5 states have return successors, (19), 5 states have call predecessors, (19), 5 states have call successors, (19) [2023-12-02 12:44:51,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:44:51,460 INFO L93 Difference]: Finished difference Result 8184 states and 13170 transitions. [2023-12-02 12:44:51,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-12-02 12:44:51,460 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 10.571428571428571) internal successors, (74), 7 states have internal predecessors, (74), 5 states have call successors, (21), 4 states have call predecessors, (21), 5 states have return successors, (19), 5 states have call predecessors, (19), 5 states have call successors, (19) Word has length 117 [2023-12-02 12:44:51,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:44:51,498 INFO L225 Difference]: With dead ends: 8184 [2023-12-02 12:44:51,498 INFO L226 Difference]: Without dead ends: 4437 [2023-12-02 12:44:51,511 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=98, Invalid=502, Unknown=0, NotChecked=0, Total=600 [2023-12-02 12:44:51,511 INFO L413 NwaCegarLoop]: 389 mSDtfsCounter, 1331 mSDsluCounter, 1247 mSDsCounter, 0 mSdLazyCounter, 3034 mSolverCounterSat, 728 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1412 SdHoareTripleChecker+Valid, 1636 SdHoareTripleChecker+Invalid, 3762 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 728 IncrementalHoareTripleChecker+Valid, 3034 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2023-12-02 12:44:51,512 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1412 Valid, 1636 Invalid, 3762 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [728 Valid, 3034 Invalid, 0 Unknown, 0 Unchecked, 2.5s Time] [2023-12-02 12:44:51,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4437 states. [2023-12-02 12:44:51,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4437 to 3702. [2023-12-02 12:44:51,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3702 states, 2605 states have (on average 1.509021113243762) internal successors, (3931), 2781 states have internal predecessors, (3931), 853 states have call successors, (853), 207 states have call predecessors, (853), 243 states have return successors, (1118), 833 states have call predecessors, (1118), 848 states have call successors, (1118) [2023-12-02 12:44:51,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3702 states to 3702 states and 5902 transitions. [2023-12-02 12:44:51,814 INFO L78 Accepts]: Start accepts. Automaton has 3702 states and 5902 transitions. Word has length 117 [2023-12-02 12:44:51,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:44:51,815 INFO L495 AbstractCegarLoop]: Abstraction has 3702 states and 5902 transitions. [2023-12-02 12:44:51,815 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 10.571428571428571) internal successors, (74), 7 states have internal predecessors, (74), 5 states have call successors, (21), 4 states have call predecessors, (21), 5 states have return successors, (19), 5 states have call predecessors, (19), 5 states have call successors, (19) [2023-12-02 12:44:51,815 INFO L276 IsEmpty]: Start isEmpty. Operand 3702 states and 5902 transitions. [2023-12-02 12:44:51,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2023-12-02 12:44:51,825 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:44:51,825 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:44:51,833 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2023-12-02 12:44:52,026 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-12-02 12:44:52,026 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:44:52,026 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:44:52,027 INFO L85 PathProgramCache]: Analyzing trace with hash 1207315174, now seen corresponding path program 1 times [2023-12-02 12:44:52,027 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:44:52,027 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1133906168] [2023-12-02 12:44:52,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:44:52,027 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:44:52,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:44:52,289 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 25 proven. 3 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-12-02 12:44:52,289 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:44:52,289 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1133906168] [2023-12-02 12:44:52,290 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1133906168] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:44:52,290 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1300911654] [2023-12-02 12:44:52,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:44:52,290 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:44:52,290 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:44:52,291 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:44:52,291 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 12:44:52,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:44:52,621 INFO L262 TraceCheckSpWp]: Trace formula consists of 1875 conjuncts, 5 conjunts are in the unsatisfiable core [2023-12-02 12:44:52,625 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:44:52,679 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 51 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-12-02 12:44:52,679 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 12:44:52,679 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1300911654] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:44:52,679 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 12:44:52,680 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [8] total 10 [2023-12-02 12:44:52,680 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [295610506] [2023-12-02 12:44:52,680 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:44:52,680 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 12:44:52,680 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:44:52,681 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 12:44:52,681 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2023-12-02 12:44:52,681 INFO L87 Difference]: Start difference. First operand 3702 states and 5902 transitions. Second operand has 4 states, 4 states have (on average 18.5) internal successors, (74), 4 states have internal predecessors, (74), 4 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (21), 4 states have call predecessors, (21), 4 states have call successors, (21) [2023-12-02 12:44:53,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:44:53,625 INFO L93 Difference]: Finished difference Result 7680 states and 12516 transitions. [2023-12-02 12:44:53,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 12:44:53,626 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.5) internal successors, (74), 4 states have internal predecessors, (74), 4 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (21), 4 states have call predecessors, (21), 4 states have call successors, (21) Word has length 123 [2023-12-02 12:44:53,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:44:53,657 INFO L225 Difference]: With dead ends: 7680 [2023-12-02 12:44:53,657 INFO L226 Difference]: Without dead ends: 4571 [2023-12-02 12:44:53,673 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2023-12-02 12:44:53,674 INFO L413 NwaCegarLoop]: 574 mSDtfsCounter, 571 mSDsluCounter, 727 mSDsCounter, 0 mSdLazyCounter, 508 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 576 SdHoareTripleChecker+Valid, 1301 SdHoareTripleChecker+Invalid, 555 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 508 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 12:44:53,674 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [576 Valid, 1301 Invalid, 555 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 508 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 12:44:53,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4571 states. [2023-12-02 12:44:53,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4571 to 4462. [2023-12-02 12:44:53,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4462 states, 3045 states have (on average 1.4972085385878489) internal successors, (4559), 3269 states have internal predecessors, (4559), 1108 states have call successors, (1108), 279 states have call predecessors, (1108), 308 states have return successors, (1454), 1081 states have call predecessors, (1454), 1101 states have call successors, (1454) [2023-12-02 12:44:54,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4462 states to 4462 states and 7121 transitions. [2023-12-02 12:44:54,022 INFO L78 Accepts]: Start accepts. Automaton has 4462 states and 7121 transitions. Word has length 123 [2023-12-02 12:44:54,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:44:54,023 INFO L495 AbstractCegarLoop]: Abstraction has 4462 states and 7121 transitions. [2023-12-02 12:44:54,023 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.5) internal successors, (74), 4 states have internal predecessors, (74), 4 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (21), 4 states have call predecessors, (21), 4 states have call successors, (21) [2023-12-02 12:44:54,023 INFO L276 IsEmpty]: Start isEmpty. Operand 4462 states and 7121 transitions. [2023-12-02 12:44:54,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2023-12-02 12:44:54,031 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:44:54,032 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:44:54,039 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2023-12-02 12:44:54,232 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-12-02 12:44:54,232 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:44:54,233 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:44:54,233 INFO L85 PathProgramCache]: Analyzing trace with hash -774204180, now seen corresponding path program 1 times [2023-12-02 12:44:54,233 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:44:54,233 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1412006040] [2023-12-02 12:44:54,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:44:54,233 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:44:54,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:44:54,626 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 19 proven. 3 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-12-02 12:44:54,626 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:44:54,626 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1412006040] [2023-12-02 12:44:54,626 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1412006040] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:44:54,626 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [608584593] [2023-12-02 12:44:54,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:44:54,627 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:44:54,627 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:44:54,628 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:44:54,631 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-12-02 12:44:55,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:44:55,040 INFO L262 TraceCheckSpWp]: Trace formula consists of 1877 conjuncts, 5 conjunts are in the unsatisfiable core [2023-12-02 12:44:55,045 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:44:55,109 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 45 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-12-02 12:44:55,109 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 12:44:55,110 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [608584593] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:44:55,110 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 12:44:55,110 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [8] total 10 [2023-12-02 12:44:55,110 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1114234179] [2023-12-02 12:44:55,110 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:44:55,111 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 12:44:55,111 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:44:55,112 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 12:44:55,112 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2023-12-02 12:44:55,112 INFO L87 Difference]: Start difference. First operand 4462 states and 7121 transitions. Second operand has 4 states, 4 states have (on average 18.75) internal successors, (75), 4 states have internal predecessors, (75), 4 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (21), 4 states have call predecessors, (21), 4 states have call successors, (21) [2023-12-02 12:44:56,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:44:56,457 INFO L93 Difference]: Finished difference Result 11268 states and 18325 transitions. [2023-12-02 12:44:56,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 12:44:56,458 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 18.75) internal successors, (75), 4 states have internal predecessors, (75), 4 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (21), 4 states have call predecessors, (21), 4 states have call successors, (21) Word has length 124 [2023-12-02 12:44:56,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:44:56,493 INFO L225 Difference]: With dead ends: 11268 [2023-12-02 12:44:56,493 INFO L226 Difference]: Without dead ends: 7377 [2023-12-02 12:44:56,513 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2023-12-02 12:44:56,513 INFO L413 NwaCegarLoop]: 894 mSDtfsCounter, 520 mSDsluCounter, 1067 mSDsCounter, 0 mSdLazyCounter, 584 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 529 SdHoareTripleChecker+Valid, 1961 SdHoareTripleChecker+Invalid, 617 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 584 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 12:44:56,514 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [529 Valid, 1961 Invalid, 617 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 584 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 12:44:56,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7377 states. [2023-12-02 12:44:57,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7377 to 7361. [2023-12-02 12:44:57,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7361 states, 4944 states have (on average 1.4908980582524272) internal successors, (7371), 5339 states have internal predecessors, (7371), 1912 states have call successors, (1912), 473 states have call predecessors, (1912), 504 states have return successors, (2444), 1860 states have call predecessors, (2444), 1901 states have call successors, (2444) [2023-12-02 12:44:57,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7361 states to 7361 states and 11727 transitions. [2023-12-02 12:44:57,114 INFO L78 Accepts]: Start accepts. Automaton has 7361 states and 11727 transitions. Word has length 124 [2023-12-02 12:44:57,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:44:57,115 INFO L495 AbstractCegarLoop]: Abstraction has 7361 states and 11727 transitions. [2023-12-02 12:44:57,115 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 18.75) internal successors, (75), 4 states have internal predecessors, (75), 4 states have call successors, (23), 3 states have call predecessors, (23), 3 states have return successors, (21), 4 states have call predecessors, (21), 4 states have call successors, (21) [2023-12-02 12:44:57,115 INFO L276 IsEmpty]: Start isEmpty. Operand 7361 states and 11727 transitions. [2023-12-02 12:44:57,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2023-12-02 12:44:57,130 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:44:57,130 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:44:57,139 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2023-12-02 12:44:57,330 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-12-02 12:44:57,331 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:44:57,331 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:44:57,331 INFO L85 PathProgramCache]: Analyzing trace with hash -206538530, now seen corresponding path program 1 times [2023-12-02 12:44:57,331 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:44:57,331 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1875793496] [2023-12-02 12:44:57,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:44:57,332 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:44:57,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:44:57,707 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 19 proven. 3 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-12-02 12:44:57,708 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:44:57,708 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1875793496] [2023-12-02 12:44:57,708 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1875793496] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:44:57,708 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1045699575] [2023-12-02 12:44:57,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:44:57,708 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:44:57,709 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:44:57,710 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:44:57,712 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-12-02 12:44:58,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:44:58,114 INFO L262 TraceCheckSpWp]: Trace formula consists of 1878 conjuncts, 23 conjunts are in the unsatisfiable core [2023-12-02 12:44:58,120 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:44:58,219 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 51 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-12-02 12:44:58,219 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 12:44:58,219 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1045699575] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:44:58,219 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 12:44:58,219 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [8] total 15 [2023-12-02 12:44:58,220 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1503029876] [2023-12-02 12:44:58,220 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:44:58,220 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-12-02 12:44:58,220 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:44:58,221 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-12-02 12:44:58,221 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=181, Unknown=0, NotChecked=0, Total=210 [2023-12-02 12:44:58,221 INFO L87 Difference]: Start difference. First operand 7361 states and 11727 transitions. Second operand has 9 states, 7 states have (on average 11.142857142857142) internal successors, (78), 7 states have internal predecessors, (78), 3 states have call successors, (23), 3 states have call predecessors, (23), 5 states have return successors, (21), 5 states have call predecessors, (21), 3 states have call successors, (21) [2023-12-02 12:44:59,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:44:59,671 INFO L93 Difference]: Finished difference Result 17954 states and 28765 transitions. [2023-12-02 12:44:59,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-12-02 12:44:59,672 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 11.142857142857142) internal successors, (78), 7 states have internal predecessors, (78), 3 states have call successors, (23), 3 states have call predecessors, (23), 5 states have return successors, (21), 5 states have call predecessors, (21), 3 states have call successors, (21) Word has length 125 [2023-12-02 12:44:59,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:44:59,719 INFO L225 Difference]: With dead ends: 17954 [2023-12-02 12:44:59,719 INFO L226 Difference]: Without dead ends: 11186 [2023-12-02 12:44:59,752 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=297, Unknown=0, NotChecked=0, Total=342 [2023-12-02 12:44:59,753 INFO L413 NwaCegarLoop]: 604 mSDtfsCounter, 560 mSDsluCounter, 2992 mSDsCounter, 0 mSdLazyCounter, 882 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 567 SdHoareTripleChecker+Valid, 3596 SdHoareTripleChecker+Invalid, 895 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 882 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 12:44:59,753 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [567 Valid, 3596 Invalid, 895 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 882 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 12:44:59,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11186 states. [2023-12-02 12:45:00,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11186 to 10282. [2023-12-02 12:45:00,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10282 states, 6895 states have (on average 1.495286439448876) internal successors, (10310), 7440 states have internal predecessors, (10310), 2683 states have call successors, (2683), 667 states have call predecessors, (2683), 703 states have return successors, (3427), 2630 states have call predecessors, (3427), 2666 states have call successors, (3427) [2023-12-02 12:45:00,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10282 states to 10282 states and 16420 transitions. [2023-12-02 12:45:00,719 INFO L78 Accepts]: Start accepts. Automaton has 10282 states and 16420 transitions. Word has length 125 [2023-12-02 12:45:00,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:45:00,720 INFO L495 AbstractCegarLoop]: Abstraction has 10282 states and 16420 transitions. [2023-12-02 12:45:00,720 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 11.142857142857142) internal successors, (78), 7 states have internal predecessors, (78), 3 states have call successors, (23), 3 states have call predecessors, (23), 5 states have return successors, (21), 5 states have call predecessors, (21), 3 states have call successors, (21) [2023-12-02 12:45:00,720 INFO L276 IsEmpty]: Start isEmpty. Operand 10282 states and 16420 transitions. [2023-12-02 12:45:00,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2023-12-02 12:45:00,728 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:45:00,729 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:45:00,738 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2023-12-02 12:45:00,929 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-12-02 12:45:00,930 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:45:00,930 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:45:00,930 INFO L85 PathProgramCache]: Analyzing trace with hash 1493538204, now seen corresponding path program 1 times [2023-12-02 12:45:00,930 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:45:00,930 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [159598281] [2023-12-02 12:45:00,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:45:00,931 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:45:00,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:45:01,307 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 25 proven. 3 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2023-12-02 12:45:01,307 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:45:01,307 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [159598281] [2023-12-02 12:45:01,307 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [159598281] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:45:01,307 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [976762397] [2023-12-02 12:45:01,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:45:01,308 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:45:01,308 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:45:01,309 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:45:01,311 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-12-02 12:45:01,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:45:01,676 INFO L262 TraceCheckSpWp]: Trace formula consists of 1891 conjuncts, 19 conjunts are in the unsatisfiable core [2023-12-02 12:45:01,680 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:45:01,808 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 55 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-12-02 12:45:01,808 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:45:02,020 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 29 proven. 2 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2023-12-02 12:45:02,021 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [976762397] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 12:45:02,021 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [794683758] [2023-12-02 12:45:02,043 INFO L159 IcfgInterpreter]: Started Sifa with 79 locations of interest [2023-12-02 12:45:02,043 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:45:02,046 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:45:02,050 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:45:02,050 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:45:28,294 INFO L197 IcfgInterpreter]: Interpreting procedure timeShift with input of size 652 for LOIs [2023-12-02 12:46:41,644 INFO L197 IcfgInterpreter]: Interpreting procedure __automaton_fail with input of size 53 for LOIs [2023-12-02 12:46:41,656 INFO L197 IcfgInterpreter]: Interpreting procedure stopRequestedInDirection with input of size 41 for LOIs [2023-12-02 12:46:42,074 INFO L197 IcfgInterpreter]: Interpreting procedure isTopFloor with input of size 35 for LOIs [2023-12-02 12:46:42,080 INFO L197 IcfgInterpreter]: Interpreting procedure isFloorCalling with input of size 444 for LOIs [2023-12-02 12:46:42,718 INFO L197 IcfgInterpreter]: Interpreting procedure buttonForFloorIsPressed with input of size 676 for LOIs [2023-12-02 12:46:47,290 INFO L197 IcfgInterpreter]: Interpreting procedure initTopDown with input of size 591 for LOIs [2023-12-02 12:46:55,194 INFO L197 IcfgInterpreter]: Interpreting procedure initFloors with input of size 565 for LOIs [2023-12-02 12:46:55,814 INFO L197 IcfgInterpreter]: Interpreting procedure continueInDirection with input of size 45 for LOIs [2023-12-02 12:46:55,847 INFO L197 IcfgInterpreter]: Interpreting procedure getCurrentHeading with input of size 17 for LOIs [2023-12-02 12:46:55,850 INFO L197 IcfgInterpreter]: Interpreting procedure bobCall with input of size 565 for LOIs [2023-12-02 12:47:07,166 INFO L197 IcfgInterpreter]: Interpreting procedure initPersonOnFloor with input of size 569 for LOIs [2023-12-02 12:47:08,103 INFO L197 IcfgInterpreter]: Interpreting procedure getOrigin with input of size 497 for LOIs [2023-12-02 12:47:08,722 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:47:17,726 WARN L293 SmtUtils]: Spent 5.03s on a formula simplification that was a NOOP. DAG size: 591 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 12:48:22,520 WARN L293 SmtUtils]: Spent 19.10s on a formula simplification. DAG size of input: 652 DAG size of output: 624 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 12:48:42,418 WARN L293 SmtUtils]: Spent 19.43s on a formula simplification. DAG size of input: 665 DAG size of output: 637 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 12:49:02,833 WARN L293 SmtUtils]: Spent 19.71s on a formula simplification. DAG size of input: 676 DAG size of output: 639 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 12:49:23,103 WARN L293 SmtUtils]: Spent 19.69s on a formula simplification. DAG size of input: 679 DAG size of output: 639 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 12:49:43,819 WARN L293 SmtUtils]: Spent 19.43s on a formula simplification. DAG size of input: 680 DAG size of output: 635 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 12:50:19,735 WARN L293 SmtUtils]: Spent 35.24s on a formula simplification. DAG size of input: 676 DAG size of output: 642 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 12:50:55,365 WARN L293 SmtUtils]: Spent 34.87s on a formula simplification. DAG size of input: 713 DAG size of output: 678 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 12:51:15,944 WARN L293 SmtUtils]: Spent 19.77s on a formula simplification. DAG size of input: 682 DAG size of output: 637 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 12:51:36,272 WARN L293 SmtUtils]: Spent 19.54s on a formula simplification. DAG size of input: 682 DAG size of output: 637 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 12:51:48,075 WARN L293 SmtUtils]: Spent 11.18s on a formula simplification. DAG size of input: 685 DAG size of output: 601 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 12:52:01,020 WARN L293 SmtUtils]: Spent 7.83s on a formula simplification. DAG size of input: 444 DAG size of output: 434 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 12:52:08,728 WARN L293 SmtUtils]: Spent 7.27s on a formula simplification. DAG size of input: 476 DAG size of output: 471 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 12:52:23,530 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '179604#(and (<= 1 |#StackHeapBarrier|) (or (and (not (= ~calls_0~0 0)) (exists ((|v_old(~currentHeading~0)_AFTER_CALL_52| Int)) (and (not (= |v_old(~currentHeading~0)_AFTER_CALL_52| 1)) (<= |v_old(~currentHeading~0)_AFTER_CALL_52| 2147483647) (<= 0 (+ |v_old(~currentHeading~0)_AFTER_CALL_52| 2147483648)))) (= ~currentHeading~0 1) (not (= ~doorState~0 1)) (= ~currentFloorID~0 1)) (and (exists ((|v_old(~currentHeading~0)_AFTER_CALL_51| Int)) (and (not (= |v_old(~currentHeading~0)_AFTER_CALL_51| 1)) (<= 0 (+ |v_old(~currentHeading~0)_AFTER_CALL_51| 2147483648)) (<= |v_old(~currentHeading~0)_AFTER_CALL_51| 2147483647))) (not (= ~calls_0~0 0)) (= ~currentHeading~0 1) (not (= ~doorState~0 1)) (= ~currentFloorID~0 1))) (= ~head~0.offset 0) (<= ~floorButtons_0~0 2147483647) (<= 0 (+ ~calls_0~0 2147483648)) (= ~head~0.base 0) (= 0 (+ ~expectedDirection~0 1)) (<= 0 (+ ~floorButtons_0~0 2147483648)) (<= ~calls_0~0 2147483647) (= ~cleanupTimeShifts~0 12))' at error location [2023-12-02 12:52:23,530 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 12:52:23,530 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 12:52:23,530 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 19 [2023-12-02 12:52:23,530 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1911322689] [2023-12-02 12:52:23,530 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 12:52:23,531 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-12-02 12:52:23,531 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:52:23,532 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-12-02 12:52:23,534 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=498, Invalid=5508, Unknown=0, NotChecked=0, Total=6006 [2023-12-02 12:52:23,535 INFO L87 Difference]: Start difference. First operand 10282 states and 16420 transitions. Second operand has 19 states, 16 states have (on average 7.875) internal successors, (126), 16 states have internal predecessors, (126), 8 states have call successors, (49), 4 states have call predecessors, (49), 10 states have return successors, (48), 11 states have call predecessors, (48), 8 states have call successors, (48) [2023-12-02 12:52:35,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:52:35,632 INFO L93 Difference]: Finished difference Result 46540 states and 78704 transitions. [2023-12-02 12:52:35,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2023-12-02 12:52:35,632 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 16 states have (on average 7.875) internal successors, (126), 16 states have internal predecessors, (126), 8 states have call successors, (49), 4 states have call predecessors, (49), 10 states have return successors, (48), 11 states have call predecessors, (48), 8 states have call successors, (48) Word has length 127 [2023-12-02 12:52:35,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:52:35,854 INFO L225 Difference]: With dead ends: 46540 [2023-12-02 12:52:35,855 INFO L226 Difference]: Without dead ends: 32082 [2023-12-02 12:52:35,980 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 481 GetRequests, 334 SyntacticMatches, 4 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8258 ImplicationChecksByTransitivity, 316.8s TimeCoverageRelationStatistics Valid=1226, Invalid=19654, Unknown=0, NotChecked=0, Total=20880 [2023-12-02 12:52:35,980 INFO L413 NwaCegarLoop]: 698 mSDtfsCounter, 4416 mSDsluCounter, 6660 mSDsCounter, 0 mSdLazyCounter, 13120 mSolverCounterSat, 1674 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4556 SdHoareTripleChecker+Valid, 7358 SdHoareTripleChecker+Invalid, 14794 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 1674 IncrementalHoareTripleChecker+Valid, 13120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:52:35,981 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4556 Valid, 7358 Invalid, 14794 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [1674 Valid, 13120 Invalid, 0 Unknown, 0 Unchecked, 7.1s Time] [2023-12-02 12:52:36,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32082 states. [2023-12-02 12:52:37,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32082 to 25557. [2023-12-02 12:52:37,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25557 states, 17212 states have (on average 1.4961073669532885) internal successors, (25751), 18825 states have internal predecessors, (25751), 6692 states have call successors, (6692), 1491 states have call predecessors, (6692), 1652 states have return successors, (9613), 6082 states have call predecessors, (9613), 6664 states have call successors, (9613) [2023-12-02 12:52:38,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25557 states to 25557 states and 42056 transitions. [2023-12-02 12:52:38,231 INFO L78 Accepts]: Start accepts. Automaton has 25557 states and 42056 transitions. Word has length 127 [2023-12-02 12:52:38,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:52:38,231 INFO L495 AbstractCegarLoop]: Abstraction has 25557 states and 42056 transitions. [2023-12-02 12:52:38,231 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 16 states have (on average 7.875) internal successors, (126), 16 states have internal predecessors, (126), 8 states have call successors, (49), 4 states have call predecessors, (49), 10 states have return successors, (48), 11 states have call predecessors, (48), 8 states have call successors, (48) [2023-12-02 12:52:38,231 INFO L276 IsEmpty]: Start isEmpty. Operand 25557 states and 42056 transitions. [2023-12-02 12:52:38,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2023-12-02 12:52:38,240 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:52:38,240 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:52:38,248 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2023-12-02 12:52:38,440 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-12-02 12:52:38,441 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:52:38,441 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:52:38,441 INFO L85 PathProgramCache]: Analyzing trace with hash -431984326, now seen corresponding path program 1 times [2023-12-02 12:52:38,441 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:52:38,441 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [539210215] [2023-12-02 12:52:38,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:52:38,441 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:52:38,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:52:38,814 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2023-12-02 12:52:38,814 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:52:38,814 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [539210215] [2023-12-02 12:52:38,815 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [539210215] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:52:38,815 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1643265639] [2023-12-02 12:52:38,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:52:38,815 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:52:38,815 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:52:38,816 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:52:38,816 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-12-02 12:52:39,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:52:39,053 INFO L262 TraceCheckSpWp]: Trace formula consists of 1696 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 12:52:39,056 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:52:39,113 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-12-02 12:52:39,114 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 12:52:39,114 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1643265639] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:52:39,114 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 12:52:39,114 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [10] total 12 [2023-12-02 12:52:39,114 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1237513785] [2023-12-02 12:52:39,114 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:52:39,115 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 12:52:39,115 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:52:39,115 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 12:52:39,116 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2023-12-02 12:52:39,116 INFO L87 Difference]: Start difference. First operand 25557 states and 42056 transitions. Second operand has 4 states, 4 states have (on average 20.5) internal successors, (82), 4 states have internal predecessors, (82), 4 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (22), 4 states have call predecessors, (22), 4 states have call successors, (22) [2023-12-02 12:52:41,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:52:41,212 INFO L93 Difference]: Finished difference Result 51922 states and 86976 transitions. [2023-12-02 12:52:41,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 12:52:41,213 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 20.5) internal successors, (82), 4 states have internal predecessors, (82), 4 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (22), 4 states have call predecessors, (22), 4 states have call successors, (22) Word has length 136 [2023-12-02 12:52:41,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:52:41,352 INFO L225 Difference]: With dead ends: 51922 [2023-12-02 12:52:41,352 INFO L226 Difference]: Without dead ends: 24310 [2023-12-02 12:52:41,480 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2023-12-02 12:52:41,481 INFO L413 NwaCegarLoop]: 601 mSDtfsCounter, 183 mSDsluCounter, 944 mSDsCounter, 0 mSdLazyCounter, 157 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 193 SdHoareTripleChecker+Valid, 1545 SdHoareTripleChecker+Invalid, 173 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:52:41,481 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [193 Valid, 1545 Invalid, 173 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 157 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 12:52:41,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24310 states. [2023-12-02 12:52:43,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24310 to 24288. [2023-12-02 12:52:43,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24288 states, 16155 states have (on average 1.4804704425874342) internal successors, (23917), 17750 states have internal predecessors, (23917), 6520 states have call successors, (6520), 1467 states have call predecessors, (6520), 1612 states have return successors, (9334), 5912 states have call predecessors, (9334), 6492 states have call successors, (9334) [2023-12-02 12:52:43,393 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24288 states to 24288 states and 39771 transitions. [2023-12-02 12:52:43,399 INFO L78 Accepts]: Start accepts. Automaton has 24288 states and 39771 transitions. Word has length 136 [2023-12-02 12:52:43,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:52:43,399 INFO L495 AbstractCegarLoop]: Abstraction has 24288 states and 39771 transitions. [2023-12-02 12:52:43,399 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 20.5) internal successors, (82), 4 states have internal predecessors, (82), 4 states have call successors, (24), 2 states have call predecessors, (24), 3 states have return successors, (22), 4 states have call predecessors, (22), 4 states have call successors, (22) [2023-12-02 12:52:43,399 INFO L276 IsEmpty]: Start isEmpty. Operand 24288 states and 39771 transitions. [2023-12-02 12:52:43,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2023-12-02 12:52:43,411 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:52:43,411 INFO L195 NwaCegarLoop]: trace histogram [5, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:52:43,418 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2023-12-02 12:52:43,611 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-12-02 12:52:43,611 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:52:43,612 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:52:43,612 INFO L85 PathProgramCache]: Analyzing trace with hash -1954979198, now seen corresponding path program 1 times [2023-12-02 12:52:43,612 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:52:43,612 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1538539240] [2023-12-02 12:52:43,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:52:43,613 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:52:43,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:52:44,086 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2023-12-02 12:52:44,086 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:52:44,086 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1538539240] [2023-12-02 12:52:44,086 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1538539240] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:52:44,086 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1621009719] [2023-12-02 12:52:44,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:52:44,086 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:52:44,087 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:52:44,087 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:52:44,090 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-12-02 12:52:44,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:52:44,368 INFO L262 TraceCheckSpWp]: Trace formula consists of 1700 conjuncts, 18 conjunts are in the unsatisfiable core [2023-12-02 12:52:44,372 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:52:44,537 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 20 proven. 1 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-12-02 12:52:44,537 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:52:46,123 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2023-12-02 12:52:46,123 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1621009719] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 12:52:46,124 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2001349279] [2023-12-02 12:52:46,127 INFO L159 IcfgInterpreter]: Started Sifa with 119 locations of interest [2023-12-02 12:52:46,127 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:52:46,128 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:52:46,128 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:52:46,128 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:53:01,343 INFO L197 IcfgInterpreter]: Interpreting procedure timeShift with input of size 562 for LOIs [2023-12-02 12:53:15,894 INFO L197 IcfgInterpreter]: Interpreting procedure buttonForFloorIsPressed with input of size 438 for LOIs [2023-12-02 12:53:17,048 INFO L197 IcfgInterpreter]: Interpreting procedure initTopDown with input of size 591 for LOIs [2023-12-02 12:53:24,933 INFO L197 IcfgInterpreter]: Interpreting procedure initFloors with input of size 565 for LOIs [2023-12-02 12:53:25,522 INFO L197 IcfgInterpreter]: Interpreting procedure getCurrentHeading with input of size 429 for LOIs [2023-12-02 12:53:25,878 INFO L197 IcfgInterpreter]: Interpreting procedure bobCall with input of size 565 for LOIs [2023-12-02 12:53:37,644 INFO L197 IcfgInterpreter]: Interpreting procedure initPersonOnFloor with input of size 569 for LOIs [2023-12-02 12:53:40,881 INFO L197 IcfgInterpreter]: Interpreting procedure getOrigin with input of size 497 for LOIs [2023-12-02 12:53:41,489 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 12:55:25,671 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [2001349279] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:55:25,671 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-12-02 12:55:25,671 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [26] imperfect sequences [10, 6, 7] total 42 [2023-12-02 12:55:25,672 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1539946370] [2023-12-02 12:55:25,672 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:55:25,672 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-12-02 12:55:25,672 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:55:25,673 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-12-02 12:55:25,674 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=1525, Unknown=0, NotChecked=0, Total=1722 [2023-12-02 12:55:25,674 INFO L87 Difference]: Start difference. First operand 24288 states and 39771 transitions. Second operand has 27 states, 20 states have (on average 4.15) internal successors, (83), 15 states have internal predecessors, (83), 10 states have call successors, (24), 8 states have call predecessors, (24), 8 states have return successors, (22), 9 states have call predecessors, (22), 9 states have call successors, (22) [2023-12-02 12:56:15,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:56:15,465 INFO L93 Difference]: Finished difference Result 48670 states and 79309 transitions. [2023-12-02 12:56:15,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2023-12-02 12:56:15,466 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 20 states have (on average 4.15) internal successors, (83), 15 states have internal predecessors, (83), 10 states have call successors, (24), 8 states have call predecessors, (24), 8 states have return successors, (22), 9 states have call predecessors, (22), 9 states have call successors, (22) Word has length 140 [2023-12-02 12:56:15,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:56:15,580 INFO L225 Difference]: With dead ends: 48670 [2023-12-02 12:56:15,581 INFO L226 Difference]: Without dead ends: 24410 [2023-12-02 12:56:15,690 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 434 GetRequests, 389 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 367 ImplicationChecksByTransitivity, 126.4s TimeCoverageRelationStatistics Valid=238, Invalid=1924, Unknown=0, NotChecked=0, Total=2162 [2023-12-02 12:56:15,691 INFO L413 NwaCegarLoop]: 563 mSDtfsCounter, 239 mSDsluCounter, 3187 mSDsCounter, 0 mSdLazyCounter, 5392 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 24.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 249 SdHoareTripleChecker+Valid, 3750 SdHoareTripleChecker+Invalid, 5450 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 5392 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 25.7s IncrementalHoareTripleChecker+Time [2023-12-02 12:56:15,692 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [249 Valid, 3750 Invalid, 5450 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [58 Valid, 5392 Invalid, 0 Unknown, 0 Unchecked, 25.7s Time] [2023-12-02 12:56:15,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24410 states. [2023-12-02 12:56:17,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24410 to 24331. [2023-12-02 12:56:17,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24331 states, 16188 states have (on average 1.479738077588337) internal successors, (23954), 17782 states have internal predecessors, (23954), 6526 states have call successors, (6526), 1472 states have call predecessors, (6526), 1616 states have return successors, (9340), 5918 states have call predecessors, (9340), 6498 states have call successors, (9340) [2023-12-02 12:56:17,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24331 states to 24331 states and 39820 transitions. [2023-12-02 12:56:17,585 INFO L78 Accepts]: Start accepts. Automaton has 24331 states and 39820 transitions. Word has length 140 [2023-12-02 12:56:17,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:56:17,586 INFO L495 AbstractCegarLoop]: Abstraction has 24331 states and 39820 transitions. [2023-12-02 12:56:17,586 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 20 states have (on average 4.15) internal successors, (83), 15 states have internal predecessors, (83), 10 states have call successors, (24), 8 states have call predecessors, (24), 8 states have return successors, (22), 9 states have call predecessors, (22), 9 states have call successors, (22) [2023-12-02 12:56:17,586 INFO L276 IsEmpty]: Start isEmpty. Operand 24331 states and 39820 transitions. [2023-12-02 12:56:17,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2023-12-02 12:56:17,595 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:56:17,595 INFO L195 NwaCegarLoop]: trace histogram [7, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:56:17,601 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2023-12-02 12:56:17,795 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:56:17,795 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:56:17,796 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:56:17,796 INFO L85 PathProgramCache]: Analyzing trace with hash 512539467, now seen corresponding path program 1 times [2023-12-02 12:56:17,796 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:56:17,796 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [845525632] [2023-12-02 12:56:17,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:56:17,796 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:56:17,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:56:18,497 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 20 proven. 3 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2023-12-02 12:56:18,497 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:56:18,498 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [845525632] [2023-12-02 12:56:18,498 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [845525632] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:56:18,498 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [91634537] [2023-12-02 12:56:18,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:56:18,498 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:56:18,498 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:56:18,499 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:56:18,502 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2023-12-02 12:56:18,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:56:18,822 INFO L262 TraceCheckSpWp]: Trace formula consists of 1911 conjuncts, 15 conjunts are in the unsatisfiable core [2023-12-02 12:56:18,825 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:56:18,912 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 55 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-12-02 12:56:18,912 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 12:56:18,912 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [91634537] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:56:18,912 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 12:56:18,912 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [18] total 24 [2023-12-02 12:56:18,912 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [112143002] [2023-12-02 12:56:18,912 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:56:18,913 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 12:56:18,913 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:56:18,913 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 12:56:18,914 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=489, Unknown=0, NotChecked=0, Total=552 [2023-12-02 12:56:18,914 INFO L87 Difference]: Start difference. First operand 24331 states and 39820 transitions. Second operand has 8 states, 7 states have (on average 12.0) internal successors, (84), 7 states have internal predecessors, (84), 3 states have call successors, (24), 3 states have call predecessors, (24), 5 states have return successors, (23), 4 states have call predecessors, (23), 3 states have call successors, (23) [2023-12-02 12:56:21,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:56:21,794 INFO L93 Difference]: Finished difference Result 47496 states and 78421 transitions. [2023-12-02 12:56:21,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-12-02 12:56:21,795 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 12.0) internal successors, (84), 7 states have internal predecessors, (84), 3 states have call successors, (24), 3 states have call predecessors, (24), 5 states have return successors, (23), 4 states have call predecessors, (23), 3 states have call successors, (23) Word has length 139 [2023-12-02 12:56:21,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:56:21,898 INFO L225 Difference]: With dead ends: 47496 [2023-12-02 12:56:21,899 INFO L226 Difference]: Without dead ends: 24294 [2023-12-02 12:56:22,015 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=80, Invalid=676, Unknown=0, NotChecked=0, Total=756 [2023-12-02 12:56:22,016 INFO L413 NwaCegarLoop]: 970 mSDtfsCounter, 679 mSDsluCounter, 3286 mSDsCounter, 0 mSdLazyCounter, 1295 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 694 SdHoareTripleChecker+Valid, 4256 SdHoareTripleChecker+Invalid, 1328 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 1295 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 12:56:22,016 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [694 Valid, 4256 Invalid, 1328 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 1295 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 12:56:22,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24294 states. [2023-12-02 12:56:23,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24294 to 23527. [2023-12-02 12:56:23,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23527 states, 15602 states have (on average 1.4785283937956673) internal successors, (23068), 17155 states have internal predecessors, (23068), 6322 states have call successors, (6322), 1455 states have call predecessors, (6322), 1602 states have return successors, (9166), 5732 states have call predecessors, (9166), 6286 states have call successors, (9166) [2023-12-02 12:56:23,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23527 states to 23527 states and 38556 transitions. [2023-12-02 12:56:23,785 INFO L78 Accepts]: Start accepts. Automaton has 23527 states and 38556 transitions. Word has length 139 [2023-12-02 12:56:23,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:56:23,786 INFO L495 AbstractCegarLoop]: Abstraction has 23527 states and 38556 transitions. [2023-12-02 12:56:23,786 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 12.0) internal successors, (84), 7 states have internal predecessors, (84), 3 states have call successors, (24), 3 states have call predecessors, (24), 5 states have return successors, (23), 4 states have call predecessors, (23), 3 states have call successors, (23) [2023-12-02 12:56:23,786 INFO L276 IsEmpty]: Start isEmpty. Operand 23527 states and 38556 transitions. [2023-12-02 12:56:23,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2023-12-02 12:56:23,795 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:56:23,795 INFO L195 NwaCegarLoop]: trace histogram [7, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:56:23,802 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2023-12-02 12:56:23,996 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:56:23,996 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:56:23,996 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:56:23,996 INFO L85 PathProgramCache]: Analyzing trace with hash -1306217579, now seen corresponding path program 1 times [2023-12-02 12:56:23,997 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:56:23,997 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1460562455] [2023-12-02 12:56:23,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:56:23,997 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:56:24,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:56:24,734 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 24 proven. 3 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2023-12-02 12:56:24,734 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:56:24,734 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1460562455] [2023-12-02 12:56:24,735 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1460562455] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:56:24,735 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1404404669] [2023-12-02 12:56:24,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:56:24,735 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:56:24,735 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:56:24,736 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:56:24,738 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2023-12-02 12:56:25,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:56:25,040 INFO L262 TraceCheckSpWp]: Trace formula consists of 1925 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 12:56:25,043 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:56:25,059 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 54 proven. 0 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2023-12-02 12:56:25,060 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 12:56:25,060 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1404404669] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:56:25,060 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 12:56:25,060 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [18] total 19 [2023-12-02 12:56:25,060 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2110039993] [2023-12-02 12:56:25,060 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:56:25,060 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 12:56:25,060 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:56:25,061 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 12:56:25,061 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2023-12-02 12:56:25,061 INFO L87 Difference]: Start difference. First operand 23527 states and 38556 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 2 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (23), 2 states have call predecessors, (23), 2 states have call successors, (23) [2023-12-02 12:56:26,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:56:26,791 INFO L93 Difference]: Finished difference Result 42366 states and 70777 transitions. [2023-12-02 12:56:26,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 12:56:26,792 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 2 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (23), 2 states have call predecessors, (23), 2 states have call successors, (23) Word has length 142 [2023-12-02 12:56:26,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:56:26,894 INFO L225 Difference]: With dead ends: 42366 [2023-12-02 12:56:26,894 INFO L226 Difference]: Without dead ends: 19948 [2023-12-02 12:56:27,052 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2023-12-02 12:56:27,053 INFO L413 NwaCegarLoop]: 549 mSDtfsCounter, 20 mSDsluCounter, 513 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 1062 SdHoareTripleChecker+Invalid, 103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:56:27,053 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 1062 Invalid, 103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 12:56:27,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19948 states. [2023-12-02 12:56:28,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19948 to 19910. [2023-12-02 12:56:28,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19910 states, 13417 states have (on average 1.4670939852426026) internal successors, (19684), 14590 states have internal predecessors, (19684), 5083 states have call successors, (5083), 1289 states have call predecessors, (5083), 1409 states have return successors, (7451), 4665 states have call predecessors, (7451), 5047 states have call successors, (7451) [2023-12-02 12:56:28,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19910 states to 19910 states and 32218 transitions. [2023-12-02 12:56:28,611 INFO L78 Accepts]: Start accepts. Automaton has 19910 states and 32218 transitions. Word has length 142 [2023-12-02 12:56:28,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:56:28,612 INFO L495 AbstractCegarLoop]: Abstraction has 19910 states and 32218 transitions. [2023-12-02 12:56:28,612 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 2 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (23), 2 states have call predecessors, (23), 2 states have call successors, (23) [2023-12-02 12:56:28,612 INFO L276 IsEmpty]: Start isEmpty. Operand 19910 states and 32218 transitions. [2023-12-02 12:56:28,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2023-12-02 12:56:28,623 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:56:28,623 INFO L195 NwaCegarLoop]: trace histogram [7, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:56:28,629 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2023-12-02 12:56:28,823 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:56:28,824 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:56:28,824 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:56:28,824 INFO L85 PathProgramCache]: Analyzing trace with hash 200532329, now seen corresponding path program 1 times [2023-12-02 12:56:28,824 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:56:28,824 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [131065225] [2023-12-02 12:56:28,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:56:28,824 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:56:28,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:56:29,478 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 20 proven. 3 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2023-12-02 12:56:29,479 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:56:29,479 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [131065225] [2023-12-02 12:56:29,479 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [131065225] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:56:29,479 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1247959094] [2023-12-02 12:56:29,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:56:29,479 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:56:29,479 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:56:29,480 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:56:29,483 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2023-12-02 12:56:29,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:56:29,755 INFO L262 TraceCheckSpWp]: Trace formula consists of 1926 conjuncts, 17 conjunts are in the unsatisfiable core [2023-12-02 12:56:29,758 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:56:29,854 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 53 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-12-02 12:56:29,855 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 12:56:29,855 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1247959094] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:56:29,855 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 12:56:29,855 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [18] total 24 [2023-12-02 12:56:29,855 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [914816769] [2023-12-02 12:56:29,855 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:56:29,856 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 12:56:29,856 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:56:29,856 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 12:56:29,856 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=491, Unknown=0, NotChecked=0, Total=552 [2023-12-02 12:56:29,857 INFO L87 Difference]: Start difference. First operand 19910 states and 32218 transitions. Second operand has 8 states, 7 states have (on average 12.142857142857142) internal successors, (85), 7 states have internal predecessors, (85), 3 states have call successors, (25), 3 states have call predecessors, (25), 5 states have return successors, (24), 4 states have call predecessors, (24), 3 states have call successors, (24) [2023-12-02 12:56:32,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:56:32,227 INFO L93 Difference]: Finished difference Result 38678 states and 62505 transitions. [2023-12-02 12:56:32,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-12-02 12:56:32,228 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 12.142857142857142) internal successors, (85), 7 states have internal predecessors, (85), 3 states have call successors, (25), 3 states have call predecessors, (25), 5 states have return successors, (24), 4 states have call predecessors, (24), 3 states have call successors, (24) Word has length 142 [2023-12-02 12:56:32,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:56:32,317 INFO L225 Difference]: With dead ends: 38678 [2023-12-02 12:56:32,317 INFO L226 Difference]: Without dead ends: 19981 [2023-12-02 12:56:32,408 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 141 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2023-12-02 12:56:32,409 INFO L413 NwaCegarLoop]: 976 mSDtfsCounter, 522 mSDsluCounter, 4576 mSDsCounter, 0 mSdLazyCounter, 1241 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 529 SdHoareTripleChecker+Valid, 5552 SdHoareTripleChecker+Invalid, 1258 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 1241 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 12:56:32,409 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [529 Valid, 5552 Invalid, 1258 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 1241 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 12:56:32,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19981 states. [2023-12-02 12:56:33,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19981 to 19956. [2023-12-02 12:56:33,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19956 states, 13461 states have (on average 1.4655671941163362) internal successors, (19728), 14614 states have internal predecessors, (19728), 5085 states have call successors, (5085), 1311 states have call predecessors, (5085), 1409 states have return successors, (7411), 4665 states have call predecessors, (7411), 5049 states have call successors, (7411) [2023-12-02 12:56:33,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19956 states to 19956 states and 32224 transitions. [2023-12-02 12:56:33,876 INFO L78 Accepts]: Start accepts. Automaton has 19956 states and 32224 transitions. Word has length 142 [2023-12-02 12:56:33,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:56:33,876 INFO L495 AbstractCegarLoop]: Abstraction has 19956 states and 32224 transitions. [2023-12-02 12:56:33,876 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 12.142857142857142) internal successors, (85), 7 states have internal predecessors, (85), 3 states have call successors, (25), 3 states have call predecessors, (25), 5 states have return successors, (24), 4 states have call predecessors, (24), 3 states have call successors, (24) [2023-12-02 12:56:33,877 INFO L276 IsEmpty]: Start isEmpty. Operand 19956 states and 32224 transitions. [2023-12-02 12:56:33,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2023-12-02 12:56:33,886 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:56:33,886 INFO L195 NwaCegarLoop]: trace histogram [8, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:56:33,892 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2023-12-02 12:56:34,086 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2023-12-02 12:56:34,087 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:56:34,087 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:56:34,087 INFO L85 PathProgramCache]: Analyzing trace with hash -242582258, now seen corresponding path program 1 times [2023-12-02 12:56:34,087 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:56:34,087 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [697588009] [2023-12-02 12:56:34,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:56:34,087 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:56:34,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:56:34,828 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 27 proven. 3 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2023-12-02 12:56:34,828 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:56:34,828 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [697588009] [2023-12-02 12:56:34,828 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [697588009] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:56:34,828 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [735581761] [2023-12-02 12:56:34,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:56:34,828 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:56:34,829 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:56:34,829 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:56:34,830 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2023-12-02 12:56:35,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:56:35,152 INFO L262 TraceCheckSpWp]: Trace formula consists of 1940 conjuncts, 15 conjunts are in the unsatisfiable core [2023-12-02 12:56:35,155 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:56:35,268 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 71 proven. 0 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2023-12-02 12:56:35,268 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 12:56:35,268 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [735581761] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:56:35,268 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 12:56:35,268 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [18] total 24 [2023-12-02 12:56:35,268 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [123323970] [2023-12-02 12:56:35,268 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:56:35,269 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 12:56:35,269 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:56:35,269 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 12:56:35,270 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=489, Unknown=0, NotChecked=0, Total=552 [2023-12-02 12:56:35,270 INFO L87 Difference]: Start difference. First operand 19956 states and 32224 transitions. Second operand has 8 states, 7 states have (on average 12.428571428571429) internal successors, (87), 7 states have internal predecessors, (87), 4 states have call successors, (26), 3 states have call predecessors, (26), 5 states have return successors, (25), 5 states have call predecessors, (25), 4 states have call successors, (25) [2023-12-02 12:56:37,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:56:37,744 INFO L93 Difference]: Finished difference Result 38899 states and 63173 transitions. [2023-12-02 12:56:37,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-12-02 12:56:37,745 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 12.428571428571429) internal successors, (87), 7 states have internal predecessors, (87), 4 states have call successors, (26), 3 states have call predecessors, (26), 5 states have return successors, (25), 5 states have call predecessors, (25), 4 states have call successors, (25) Word has length 147 [2023-12-02 12:56:37,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:56:37,858 INFO L225 Difference]: With dead ends: 38899 [2023-12-02 12:56:37,858 INFO L226 Difference]: Without dead ends: 19982 [2023-12-02 12:56:37,982 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=80, Invalid=676, Unknown=0, NotChecked=0, Total=756 [2023-12-02 12:56:37,983 INFO L413 NwaCegarLoop]: 585 mSDtfsCounter, 564 mSDsluCounter, 2510 mSDsCounter, 0 mSdLazyCounter, 1271 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 579 SdHoareTripleChecker+Valid, 3095 SdHoareTripleChecker+Invalid, 1302 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 1271 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 12:56:37,983 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [579 Valid, 3095 Invalid, 1302 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 1271 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 12:56:37,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19982 states. [2023-12-02 12:56:39,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19982 to 19460. [2023-12-02 12:56:39,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19460 states, 13092 states have (on average 1.4685304002444242) internal successors, (19226), 14225 states have internal predecessors, (19226), 5005 states have call successors, (5005), 1285 states have call predecessors, (5005), 1362 states have return successors, (7146), 4584 states have call predecessors, (7146), 4965 states have call successors, (7146) [2023-12-02 12:56:39,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19460 states to 19460 states and 31377 transitions. [2023-12-02 12:56:39,538 INFO L78 Accepts]: Start accepts. Automaton has 19460 states and 31377 transitions. Word has length 147 [2023-12-02 12:56:39,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:56:39,538 INFO L495 AbstractCegarLoop]: Abstraction has 19460 states and 31377 transitions. [2023-12-02 12:56:39,539 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 12.428571428571429) internal successors, (87), 7 states have internal predecessors, (87), 4 states have call successors, (26), 3 states have call predecessors, (26), 5 states have return successors, (25), 5 states have call predecessors, (25), 4 states have call successors, (25) [2023-12-02 12:56:39,539 INFO L276 IsEmpty]: Start isEmpty. Operand 19460 states and 31377 transitions. [2023-12-02 12:56:39,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2023-12-02 12:56:39,546 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:56:39,546 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:56:39,553 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2023-12-02 12:56:39,746 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2023-12-02 12:56:39,747 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:56:39,747 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:56:39,747 INFO L85 PathProgramCache]: Analyzing trace with hash 1430954301, now seen corresponding path program 1 times [2023-12-02 12:56:39,747 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:56:39,747 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [230644228] [2023-12-02 12:56:39,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:56:39,747 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:56:39,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:56:39,864 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-12-02 12:56:39,864 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:56:39,864 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [230644228] [2023-12-02 12:56:39,864 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [230644228] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 12:56:39,864 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 12:56:39,864 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-12-02 12:56:39,864 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [170900107] [2023-12-02 12:56:39,864 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 12:56:39,865 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 12:56:39,865 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 12:56:39,865 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 12:56:39,865 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 12:56:39,865 INFO L87 Difference]: Start difference. First operand 19460 states and 31377 transitions. Second operand has 5 states, 5 states have (on average 17.4) internal successors, (87), 4 states have internal predecessors, (87), 2 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (23), 3 states have call predecessors, (23), 2 states have call successors, (23) [2023-12-02 12:56:41,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 12:56:41,529 INFO L93 Difference]: Finished difference Result 38084 states and 62647 transitions. [2023-12-02 12:56:41,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 12:56:41,530 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 17.4) internal successors, (87), 4 states have internal predecessors, (87), 2 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (23), 3 states have call predecessors, (23), 2 states have call successors, (23) Word has length 146 [2023-12-02 12:56:41,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 12:56:41,736 INFO L225 Difference]: With dead ends: 38084 [2023-12-02 12:56:41,736 INFO L226 Difference]: Without dead ends: 19707 [2023-12-02 12:56:41,829 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 12:56:41,829 INFO L413 NwaCegarLoop]: 559 mSDtfsCounter, 13 mSDsluCounter, 1642 mSDsCounter, 0 mSdLazyCounter, 161 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 2201 SdHoareTripleChecker+Invalid, 163 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 161 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 12:56:41,829 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 2201 Invalid, 163 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 161 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 12:56:41,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19707 states. [2023-12-02 12:56:43,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19707 to 19575. [2023-12-02 12:56:43,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19575 states, 13170 states have (on average 1.4634776006074413) internal successors, (19274), 14342 states have internal predecessors, (19274), 4975 states have call successors, (4975), 1275 states have call predecessors, (4975), 1429 states have return successors, (7350), 4592 states have call predecessors, (7350), 4935 states have call successors, (7350) [2023-12-02 12:56:43,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19575 states to 19575 states and 31599 transitions. [2023-12-02 12:56:43,258 INFO L78 Accepts]: Start accepts. Automaton has 19575 states and 31599 transitions. Word has length 146 [2023-12-02 12:56:43,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 12:56:43,259 INFO L495 AbstractCegarLoop]: Abstraction has 19575 states and 31599 transitions. [2023-12-02 12:56:43,259 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 17.4) internal successors, (87), 4 states have internal predecessors, (87), 2 states have call successors, (25), 2 states have call predecessors, (25), 2 states have return successors, (23), 3 states have call predecessors, (23), 2 states have call successors, (23) [2023-12-02 12:56:43,259 INFO L276 IsEmpty]: Start isEmpty. Operand 19575 states and 31599 transitions. [2023-12-02 12:56:43,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2023-12-02 12:56:43,265 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 12:56:43,265 INFO L195 NwaCegarLoop]: trace histogram [7, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 12:56:43,265 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2023-12-02 12:56:43,265 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 12:56:43,266 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 12:56:43,266 INFO L85 PathProgramCache]: Analyzing trace with hash 470800898, now seen corresponding path program 1 times [2023-12-02 12:56:43,266 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 12:56:43,266 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1780070129] [2023-12-02 12:56:43,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:56:43,266 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 12:56:43,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:56:43,952 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 20 proven. 3 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-12-02 12:56:43,952 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 12:56:43,952 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1780070129] [2023-12-02 12:56:43,952 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1780070129] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 12:56:43,952 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [740881340] [2023-12-02 12:56:43,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 12:56:43,952 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 12:56:43,953 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 12:56:43,953 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 12:56:43,954 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_07c30354-95ee-4f92-80d9-27e3f94e9732/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2023-12-02 12:56:44,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 12:56:44,250 INFO L262 TraceCheckSpWp]: Trace formula consists of 1943 conjuncts, 21 conjunts are in the unsatisfiable core [2023-12-02 12:56:44,255 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 12:56:44,415 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 53 proven. 4 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-12-02 12:56:44,415 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 12:56:44,769 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2023-12-02 12:56:44,769 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [740881340] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 12:56:44,769 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1511077323] [2023-12-02 12:56:44,773 INFO L159 IcfgInterpreter]: Started Sifa with 98 locations of interest [2023-12-02 12:56:44,773 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 12:56:44,773 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 12:56:44,773 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 12:56:44,773 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 12:57:04,962 INFO L197 IcfgInterpreter]: Interpreting procedure timeShift with input of size 601 for LOIs