./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/elevator_spec3_product30.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_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/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_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/elevator_spec3_product30.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/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_2b10846b-4713-4b82-9d51-656592dd9277/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 4fa4154afcc1fa94c570756c4d3485a9415aeef22801b46450f13cd61ecf8230 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 14:56:42,901 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 14:56:42,983 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 14:56:42,988 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 14:56:42,989 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 14:56:43,020 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 14:56:43,020 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 14:56:43,021 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 14:56:43,022 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 14:56:43,023 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 14:56:43,023 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 14:56:43,024 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 14:56:43,025 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 14:56:43,025 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 14:56:43,026 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 14:56:43,026 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 14:56:43,027 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 14:56:43,028 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 14:56:43,028 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 14:56:43,029 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 14:56:43,030 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 14:56:43,035 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 14:56:43,036 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 14:56:43,036 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 14:56:43,037 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 14:56:43,037 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 14:56:43,038 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 14:56:43,038 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 14:56:43,039 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 14:56:43,039 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 14:56:43,039 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 14:56:43,040 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 14:56:43,040 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 14:56:43,040 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 14:56:43,041 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 14:56:43,041 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 14:56:43,041 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 14:56:43,041 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 14:56:43,042 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 14:56:43,042 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 14:56:43,042 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 14:56:43,043 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 14:56:43,043 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 14:56:43,043 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 14:56:43,043 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 14:56:43,044 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 14:56:43,044 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 14:56:43,044 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_2b10846b-4713-4b82-9d51-656592dd9277/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4fa4154afcc1fa94c570756c4d3485a9415aeef22801b46450f13cd61ecf8230 [2023-12-02 14:56:43,289 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 14:56:43,312 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 14:56:43,315 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 14:56:43,316 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 14:56:43,317 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 14:56:43,318 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/product-lines/elevator_spec3_product30.cil.c [2023-12-02 14:56:46,169 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 14:56:46,512 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 14:56:46,513 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/sv-benchmarks/c/product-lines/elevator_spec3_product30.cil.c [2023-12-02 14:56:46,537 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/data/869e91a1b/52406b6b12f249f58c9e3174e0e5cdbb/FLAG11efe88ef [2023-12-02 14:56:46,553 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/data/869e91a1b/52406b6b12f249f58c9e3174e0e5cdbb [2023-12-02 14:56:46,556 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 14:56:46,557 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 14:56:46,559 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 14:56:46,559 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 14:56:46,565 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 14:56:46,566 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 02:56:46" (1/1) ... [2023-12-02 14:56:46,567 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@68fcdbd7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:56:46, skipping insertion in model container [2023-12-02 14:56:46,567 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 02:56:46" (1/1) ... [2023-12-02 14:56:46,654 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 14:56:46,943 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_2b10846b-4713-4b82-9d51-656592dd9277/sv-benchmarks/c/product-lines/elevator_spec3_product30.cil.c[14523,14536] [2023-12-02 14:56:47,146 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 14:56:47,161 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 14:56:47,174 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Person.i","") [48] [2023-12-02 14:56:47,175 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Test.i","") [169] [2023-12-02 14:56:47,176 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"UnitTests.i","") [528] [2023-12-02 14:56:47,176 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Specification3_spec.i","") [623] [2023-12-02 14:56:47,176 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"scenario.i","") [813] [2023-12-02 14:56:47,177 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"wsllib_check.i","") [828] [2023-12-02 14:56:47,178 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Elevator.i","") [837] [2023-12-02 14:56:47,178 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"libacc.i","") [2419] [2023-12-02 14:56:47,178 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"featureselect.i","") [2785] [2023-12-02 14:56:47,179 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Floor.i","") [2820] [2023-12-02 14:56:47,229 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_2b10846b-4713-4b82-9d51-656592dd9277/sv-benchmarks/c/product-lines/elevator_spec3_product30.cil.c[14523,14536] [2023-12-02 14:56:47,301 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 14:56:47,335 INFO L206 MainTranslator]: Completed translation [2023-12-02 14:56:47,336 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:56:47 WrapperNode [2023-12-02 14:56:47,336 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 14:56:47,337 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 14:56:47,337 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 14:56:47,337 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 14:56:47,345 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:56:47" (1/1) ... [2023-12-02 14:56:47,377 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:56:47" (1/1) ... [2023-12-02 14:56:47,428 INFO L138 Inliner]: procedures = 93, calls = 353, calls flagged for inlining = 28, calls inlined = 24, statements flattened = 948 [2023-12-02 14:56:47,429 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 14:56:47,430 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 14:56:47,430 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 14:56:47,430 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 14:56:47,438 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:56:47" (1/1) ... [2023-12-02 14:56:47,438 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:56:47" (1/1) ... [2023-12-02 14:56:47,447 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:56:47" (1/1) ... [2023-12-02 14:56:47,448 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:56:47" (1/1) ... [2023-12-02 14:56:47,477 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:56:47" (1/1) ... [2023-12-02 14:56:47,496 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:56:47" (1/1) ... [2023-12-02 14:56:47,503 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:56:47" (1/1) ... [2023-12-02 14:56:47,511 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:56:47" (1/1) ... [2023-12-02 14:56:47,524 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 14:56:47,525 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 14:56:47,525 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 14:56:47,525 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 14:56:47,526 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:56:47" (1/1) ... [2023-12-02 14:56:47,534 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 14:56:47,549 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:56:47,563 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 14:56:47,567 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 14:56:47,603 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 14:56:47,603 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentHeading [2023-12-02 14:56:47,604 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentHeading [2023-12-02 14:56:47,604 INFO L130 BoogieDeclarations]: Found specification of procedure getWeight [2023-12-02 14:56:47,604 INFO L138 BoogieDeclarations]: Found implementation of procedure getWeight [2023-12-02 14:56:47,604 INFO L130 BoogieDeclarations]: Found specification of procedure enterElevator [2023-12-02 14:56:47,604 INFO L138 BoogieDeclarations]: Found implementation of procedure enterElevator [2023-12-02 14:56:47,604 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection [2023-12-02 14:56:47,605 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection [2023-12-02 14:56:47,605 INFO L130 BoogieDeclarations]: Found specification of procedure bobCall [2023-12-02 14:56:47,605 INFO L138 BoogieDeclarations]: Found implementation of procedure bobCall [2023-12-02 14:56:47,605 INFO L130 BoogieDeclarations]: Found specification of procedure getReverseHeading [2023-12-02 14:56:47,605 INFO L138 BoogieDeclarations]: Found implementation of procedure getReverseHeading [2023-12-02 14:56:47,605 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection__wrappee__empty [2023-12-02 14:56:47,606 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection__wrappee__empty [2023-12-02 14:56:47,606 INFO L130 BoogieDeclarations]: Found specification of procedure cleanup [2023-12-02 14:56:47,606 INFO L138 BoogieDeclarations]: Found implementation of procedure cleanup [2023-12-02 14:56:47,606 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift [2023-12-02 14:56:47,606 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift [2023-12-02 14:56:47,606 INFO L130 BoogieDeclarations]: Found specification of procedure __automaton_fail [2023-12-02 14:56:47,607 INFO L138 BoogieDeclarations]: Found implementation of procedure __automaton_fail [2023-12-02 14:56:47,607 INFO L130 BoogieDeclarations]: Found specification of procedure isTopFloor [2023-12-02 14:56:47,607 INFO L138 BoogieDeclarations]: Found implementation of procedure isTopFloor [2023-12-02 14:56:47,607 INFO L130 BoogieDeclarations]: Found specification of procedure getDestination [2023-12-02 14:56:47,607 INFO L138 BoogieDeclarations]: Found implementation of procedure getDestination [2023-12-02 14:56:47,607 INFO L130 BoogieDeclarations]: Found specification of procedure isBlocked [2023-12-02 14:56:47,607 INFO L138 BoogieDeclarations]: Found implementation of procedure isBlocked [2023-12-02 14:56:47,608 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentFloorID [2023-12-02 14:56:47,608 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentFloorID [2023-12-02 14:56:47,608 INFO L130 BoogieDeclarations]: Found specification of procedure initTopDown [2023-12-02 14:56:47,608 INFO L138 BoogieDeclarations]: Found implementation of procedure initTopDown [2023-12-02 14:56:47,608 INFO L130 BoogieDeclarations]: Found specification of procedure resetCallOnFloor [2023-12-02 14:56:47,608 INFO L138 BoogieDeclarations]: Found implementation of procedure resetCallOnFloor [2023-12-02 14:56:47,609 INFO L130 BoogieDeclarations]: Found specification of procedure initFloors [2023-12-02 14:56:47,609 INFO L138 BoogieDeclarations]: Found implementation of procedure initFloors [2023-12-02 14:56:47,609 INFO L130 BoogieDeclarations]: Found specification of procedure initPersonOnFloor [2023-12-02 14:56:47,609 INFO L138 BoogieDeclarations]: Found implementation of procedure initPersonOnFloor [2023-12-02 14:56:47,609 INFO L130 BoogieDeclarations]: Found specification of procedure removePersonFromFloor [2023-12-02 14:56:47,609 INFO L138 BoogieDeclarations]: Found implementation of procedure removePersonFromFloor [2023-12-02 14:56:47,609 INFO L130 BoogieDeclarations]: Found specification of procedure getOrigin [2023-12-02 14:56:47,610 INFO L138 BoogieDeclarations]: Found implementation of procedure getOrigin [2023-12-02 14:56:47,610 INFO L130 BoogieDeclarations]: Found specification of procedure continueInDirection [2023-12-02 14:56:47,610 INFO L138 BoogieDeclarations]: Found implementation of procedure continueInDirection [2023-12-02 14:56:47,610 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 14:56:47,610 INFO L130 BoogieDeclarations]: Found specification of procedure buttonForFloorIsPressed [2023-12-02 14:56:47,610 INFO L138 BoogieDeclarations]: Found implementation of procedure buttonForFloorIsPressed [2023-12-02 14:56:47,611 INFO L130 BoogieDeclarations]: Found specification of procedure pressInLiftFloorButton [2023-12-02 14:56:47,611 INFO L138 BoogieDeclarations]: Found implementation of procedure pressInLiftFloorButton [2023-12-02 14:56:47,611 INFO L130 BoogieDeclarations]: Found specification of procedure leaveElevator [2023-12-02 14:56:47,611 INFO L138 BoogieDeclarations]: Found implementation of procedure leaveElevator [2023-12-02 14:56:47,611 INFO L130 BoogieDeclarations]: Found specification of procedure isPersonOnFloor [2023-12-02 14:56:47,611 INFO L138 BoogieDeclarations]: Found implementation of procedure isPersonOnFloor [2023-12-02 14:56:47,611 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift__wrappee__twothirdsfull [2023-12-02 14:56:47,612 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift__wrappee__twothirdsfull [2023-12-02 14:56:47,612 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 14:56:47,612 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 14:56:47,612 INFO L130 BoogieDeclarations]: Found specification of procedure isFloorCalling [2023-12-02 14:56:47,612 INFO L138 BoogieDeclarations]: Found implementation of procedure isFloorCalling [2023-12-02 14:56:47,786 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 14:56:47,789 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 14:56:48,965 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 14:56:49,919 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 14:56:49,919 INFO L309 CfgBuilder]: Removed 1 assume(true) statements. [2023-12-02 14:56:49,921 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 02:56:49 BoogieIcfgContainer [2023-12-02 14:56:49,922 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 14:56:49,924 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 14:56:49,924 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 14:56:49,928 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 14:56:49,928 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 02:56:46" (1/3) ... [2023-12-02 14:56:49,929 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@fe6129b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 02:56:49, skipping insertion in model container [2023-12-02 14:56:49,929 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:56:47" (2/3) ... [2023-12-02 14:56:49,930 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@fe6129b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 02:56:49, skipping insertion in model container [2023-12-02 14:56:49,930 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 02:56:49" (3/3) ... [2023-12-02 14:56:49,931 INFO L112 eAbstractionObserver]: Analyzing ICFG elevator_spec3_product30.cil.c [2023-12-02 14:56:49,954 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 14:56:49,955 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-02 14:56:50,022 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 14:56:50,030 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;@51f8bb5e, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 14:56:50,030 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-02 14:56:50,038 INFO L276 IsEmpty]: Start isEmpty. Operand has 411 states, 274 states have (on average 1.572992700729927) internal successors, (431), 294 states have internal predecessors, (431), 108 states have call successors, (108), 27 states have call predecessors, (108), 27 states have return successors, (108), 104 states have call predecessors, (108), 108 states have call successors, (108) [2023-12-02 14:56:50,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2023-12-02 14:56:50,051 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:56:50,052 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] [2023-12-02 14:56:50,052 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:56:50,058 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:56:50,058 INFO L85 PathProgramCache]: Analyzing trace with hash 152325223, now seen corresponding path program 1 times [2023-12-02 14:56:50,069 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:56:50,070 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1767047398] [2023-12-02 14:56:50,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:56:50,071 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:56:50,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:56:50,873 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 14:56:50,873 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:56:50,873 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1767047398] [2023-12-02 14:56:50,874 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1767047398] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:56:50,874 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 14:56:50,874 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-12-02 14:56:50,876 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1430551397] [2023-12-02 14:56:50,876 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:56:50,881 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 14:56:50,881 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:56:50,913 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 14:56:50,914 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 14:56:50,918 INFO L87 Difference]: Start difference. First operand has 411 states, 274 states have (on average 1.572992700729927) internal successors, (431), 294 states have internal predecessors, (431), 108 states have call successors, (108), 27 states have call predecessors, (108), 27 states have return successors, (108), 104 states have call predecessors, (108), 108 states have call successors, (108) Second operand has 6 states, 5 states have (on average 6.0) internal successors, (30), 5 states have internal predecessors, (30), 4 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2023-12-02 14:56:52,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:56:52,238 INFO L93 Difference]: Finished difference Result 1158 states and 1853 transitions. [2023-12-02 14:56:52,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 14:56:52,240 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 6.0) internal successors, (30), 5 states have internal predecessors, (30), 4 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) Word has length 49 [2023-12-02 14:56:52,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:56:52,263 INFO L225 Difference]: With dead ends: 1158 [2023-12-02 14:56:52,263 INFO L226 Difference]: Without dead ends: 749 [2023-12-02 14:56:52,272 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2023-12-02 14:56:52,276 INFO L413 NwaCegarLoop]: 621 mSDtfsCounter, 530 mSDsluCounter, 2186 mSDsCounter, 0 mSdLazyCounter, 704 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 532 SdHoareTripleChecker+Valid, 2807 SdHoareTripleChecker+Invalid, 742 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 704 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:56:52,277 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [532 Valid, 2807 Invalid, 742 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 704 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2023-12-02 14:56:52,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 749 states. [2023-12-02 14:56:52,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 749 to 743. [2023-12-02 14:56:52,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 743 states, 497 states have (on average 1.5010060362173039) internal successors, (746), 531 states have internal predecessors, (746), 198 states have call successors, (198), 51 states have call predecessors, (198), 47 states have return successors, (201), 187 states have call predecessors, (201), 194 states have call successors, (201) [2023-12-02 14:56:52,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 743 states to 743 states and 1145 transitions. [2023-12-02 14:56:52,402 INFO L78 Accepts]: Start accepts. Automaton has 743 states and 1145 transitions. Word has length 49 [2023-12-02 14:56:52,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:56:52,402 INFO L495 AbstractCegarLoop]: Abstraction has 743 states and 1145 transitions. [2023-12-02 14:56:52,403 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 6.0) internal successors, (30), 5 states have internal predecessors, (30), 4 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2023-12-02 14:56:52,403 INFO L276 IsEmpty]: Start isEmpty. Operand 743 states and 1145 transitions. [2023-12-02 14:56:52,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2023-12-02 14:56:52,406 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:56:52,407 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] [2023-12-02 14:56:52,407 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 14:56:52,407 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:56:52,408 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:56:52,408 INFO L85 PathProgramCache]: Analyzing trace with hash -1886913394, now seen corresponding path program 1 times [2023-12-02 14:56:52,408 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:56:52,408 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [169080631] [2023-12-02 14:56:52,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:56:52,409 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:56:52,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:56:52,726 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 14:56:52,726 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:56:52,726 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [169080631] [2023-12-02 14:56:52,727 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [169080631] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:56:52,727 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 14:56:52,727 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 14:56:52,728 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2032385591] [2023-12-02 14:56:52,728 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:56:52,729 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 14:56:52,730 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:56:52,730 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 14:56:52,731 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 14:56:52,731 INFO L87 Difference]: Start difference. First operand 743 states and 1145 transitions. Second operand has 3 states, 3 states have (on average 9.666666666666666) internal successors, (29), 3 states have internal predecessors, (29), 3 states have call successors, (11), 3 states have call predecessors, (11), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 14:56:53,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:56:53,079 INFO L93 Difference]: Finished difference Result 2199 states and 3423 transitions. [2023-12-02 14:56:53,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 14:56:53,080 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 9.666666666666666) internal successors, (29), 3 states have internal predecessors, (29), 3 states have call successors, (11), 3 states have call predecessors, (11), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 50 [2023-12-02 14:56:53,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:56:53,095 INFO L225 Difference]: With dead ends: 2199 [2023-12-02 14:56:53,095 INFO L226 Difference]: Without dead ends: 1469 [2023-12-02 14:56:53,100 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 14:56:53,102 INFO L413 NwaCegarLoop]: 647 mSDtfsCounter, 602 mSDsluCounter, 569 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 602 SdHoareTripleChecker+Valid, 1216 SdHoareTripleChecker+Invalid, 106 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 14:56:53,102 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [602 Valid, 1216 Invalid, 106 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 14:56:53,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1469 states. [2023-12-02 14:56:53,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1469 to 1397. [2023-12-02 14:56:53,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1397 states, 963 states have (on average 1.5150571131879542) internal successors, (1459), 1015 states have internal predecessors, (1459), 349 states have call successors, (349), 91 states have call predecessors, (349), 84 states have return successors, (369), 318 states have call predecessors, (369), 343 states have call successors, (369) [2023-12-02 14:56:53,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1397 states to 1397 states and 2177 transitions. [2023-12-02 14:56:53,206 INFO L78 Accepts]: Start accepts. Automaton has 1397 states and 2177 transitions. Word has length 50 [2023-12-02 14:56:53,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:56:53,206 INFO L495 AbstractCegarLoop]: Abstraction has 1397 states and 2177 transitions. [2023-12-02 14:56:53,207 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 9.666666666666666) internal successors, (29), 3 states have internal predecessors, (29), 3 states have call successors, (11), 3 states have call predecessors, (11), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2023-12-02 14:56:53,207 INFO L276 IsEmpty]: Start isEmpty. Operand 1397 states and 2177 transitions. [2023-12-02 14:56:53,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2023-12-02 14:56:53,216 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:56:53,217 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:56:53,217 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-12-02 14:56:53,217 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:56:53,218 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:56:53,218 INFO L85 PathProgramCache]: Analyzing trace with hash 269450075, now seen corresponding path program 1 times [2023-12-02 14:56:53,218 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:56:53,218 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [111506709] [2023-12-02 14:56:53,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:56:53,219 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:56:53,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:56:53,696 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 14:56:53,696 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:56:53,696 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [111506709] [2023-12-02 14:56:53,697 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [111506709] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:56:53,697 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1861016074] [2023-12-02 14:56:53,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:56:53,697 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:56:53,698 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:56:53,701 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:56:53,710 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 14:56:54,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:56:54,149 INFO L262 TraceCheckSpWp]: Trace formula consists of 1805 conjuncts, 6 conjunts are in the unsatisfiable core [2023-12-02 14:56:54,162 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:56:54,280 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:56:54,281 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:56:54,281 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1861016074] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:56:54,282 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:56:54,282 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [10] total 12 [2023-12-02 14:56:54,282 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [309068325] [2023-12-02 14:56:54,283 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:56:54,283 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 14:56:54,284 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:56:54,285 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 14:56:54,285 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2023-12-02 14:56:54,285 INFO L87 Difference]: Start difference. First operand 1397 states and 2177 transitions. Second operand has 4 states, 4 states have (on average 13.5) internal successors, (54), 3 states have internal predecessors, (54), 2 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (15), 2 states have call predecessors, (15), 2 states have call successors, (15) [2023-12-02 14:56:54,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:56:54,631 INFO L93 Difference]: Finished difference Result 3094 states and 4830 transitions. [2023-12-02 14:56:54,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 14:56:54,632 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 13.5) internal successors, (54), 3 states have internal predecessors, (54), 2 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (15), 2 states have call predecessors, (15), 2 states have call successors, (15) Word has length 86 [2023-12-02 14:56:54,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:56:54,649 INFO L225 Difference]: With dead ends: 3094 [2023-12-02 14:56:54,650 INFO L226 Difference]: Without dead ends: 1709 [2023-12-02 14:56:54,661 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2023-12-02 14:56:54,663 INFO L413 NwaCegarLoop]: 671 mSDtfsCounter, 424 mSDsluCounter, 1040 mSDsCounter, 0 mSdLazyCounter, 113 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 426 SdHoareTripleChecker+Valid, 1711 SdHoareTripleChecker+Invalid, 123 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 14:56:54,663 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [426 Valid, 1711 Invalid, 123 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 113 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 14:56:54,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1709 states. [2023-12-02 14:56:54,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1709 to 1691. [2023-12-02 14:56:54,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1691 states, 1161 states have (on average 1.4969853574504737) internal successors, (1738), 1212 states have internal predecessors, (1738), 419 states have call successors, (419), 115 states have call predecessors, (419), 110 states have return successors, (457), 390 states have call predecessors, (457), 411 states have call successors, (457) [2023-12-02 14:56:54,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1691 states to 1691 states and 2614 transitions. [2023-12-02 14:56:54,827 INFO L78 Accepts]: Start accepts. Automaton has 1691 states and 2614 transitions. Word has length 86 [2023-12-02 14:56:54,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:56:54,828 INFO L495 AbstractCegarLoop]: Abstraction has 1691 states and 2614 transitions. [2023-12-02 14:56:54,828 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 13.5) internal successors, (54), 3 states have internal predecessors, (54), 2 states have call successors, (17), 2 states have call predecessors, (17), 2 states have return successors, (15), 2 states have call predecessors, (15), 2 states have call successors, (15) [2023-12-02 14:56:54,828 INFO L276 IsEmpty]: Start isEmpty. Operand 1691 states and 2614 transitions. [2023-12-02 14:56:54,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2023-12-02 14:56:54,832 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:56:54,832 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:56:54,846 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 14:56:55,032 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:56:55,033 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:56:55,034 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:56:55,034 INFO L85 PathProgramCache]: Analyzing trace with hash 331625818, now seen corresponding path program 1 times [2023-12-02 14:56:55,034 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:56:55,034 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1305343929] [2023-12-02 14:56:55,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:56:55,035 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:56:55,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:56:55,531 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 14:56:55,533 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:56:55,533 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1305343929] [2023-12-02 14:56:55,533 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1305343929] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:56:55,533 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 14:56:55,533 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-12-02 14:56:55,534 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [145613737] [2023-12-02 14:56:55,534 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:56:55,535 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 14:56:55,535 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:56:55,536 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 14:56:55,536 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-12-02 14:56:55,536 INFO L87 Difference]: Start difference. First operand 1691 states and 2614 transitions. Second operand has 6 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (15), 4 states have call predecessors, (15), 3 states have call successors, (15) [2023-12-02 14:56:56,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:56:56,512 INFO L93 Difference]: Finished difference Result 4291 states and 6779 transitions. [2023-12-02 14:56:56,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 14:56:56,514 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (15), 4 states have call predecessors, (15), 3 states have call successors, (15) Word has length 87 [2023-12-02 14:56:56,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:56:56,539 INFO L225 Difference]: With dead ends: 4291 [2023-12-02 14:56:56,539 INFO L226 Difference]: Without dead ends: 2612 [2023-12-02 14:56:56,554 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2023-12-02 14:56:56,555 INFO L413 NwaCegarLoop]: 651 mSDtfsCounter, 637 mSDsluCounter, 2315 mSDsCounter, 0 mSdLazyCounter, 465 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 653 SdHoareTripleChecker+Valid, 2966 SdHoareTripleChecker+Invalid, 507 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 465 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 14:56:56,556 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [653 Valid, 2966 Invalid, 507 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 465 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 14:56:56,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2612 states. [2023-12-02 14:56:56,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2612 to 2474. [2023-12-02 14:56:56,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2474 states, 1702 states have (on average 1.4882491186839013) internal successors, (2533), 1785 states have internal predecessors, (2533), 607 states have call successors, (607), 171 states have call predecessors, (607), 164 states have return successors, (710), 559 states have call predecessors, (710), 596 states have call successors, (710) [2023-12-02 14:56:56,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2474 states to 2474 states and 3850 transitions. [2023-12-02 14:56:56,770 INFO L78 Accepts]: Start accepts. Automaton has 2474 states and 3850 transitions. Word has length 87 [2023-12-02 14:56:56,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:56:56,770 INFO L495 AbstractCegarLoop]: Abstraction has 2474 states and 3850 transitions. [2023-12-02 14:56:56,771 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 10.8) internal successors, (54), 5 states have internal predecessors, (54), 3 states have call successors, (17), 3 states have call predecessors, (17), 3 states have return successors, (15), 4 states have call predecessors, (15), 3 states have call successors, (15) [2023-12-02 14:56:56,771 INFO L276 IsEmpty]: Start isEmpty. Operand 2474 states and 3850 transitions. [2023-12-02 14:56:56,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2023-12-02 14:56:56,774 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:56:56,774 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:56:56,774 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-12-02 14:56:56,775 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:56:56,775 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:56:56,775 INFO L85 PathProgramCache]: Analyzing trace with hash 1398539297, now seen corresponding path program 1 times [2023-12-02 14:56:56,775 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:56:56,776 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [320579666] [2023-12-02 14:56:56,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:56:56,776 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:56:56,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:56:57,118 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 14:56:57,118 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:56:57,118 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [320579666] [2023-12-02 14:56:57,118 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [320579666] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:56:57,118 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1266611292] [2023-12-02 14:56:57,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:56:57,119 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:56:57,119 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:56:57,122 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:56:57,125 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 14:56:57,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:56:57,570 INFO L262 TraceCheckSpWp]: Trace formula consists of 1795 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 14:56:57,578 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:56:57,685 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:56:57,685 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:56:57,686 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1266611292] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:56:57,686 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:56:57,686 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 14:56:57,686 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1086223247] [2023-12-02 14:56:57,687 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:56:57,687 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 14:56:57,687 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:56:57,688 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 14:56:57,688 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-12-02 14:56:57,689 INFO L87 Difference]: Start difference. First operand 2474 states and 3850 transitions. Second operand has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) [2023-12-02 14:56:58,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:56:58,143 INFO L93 Difference]: Finished difference Result 6967 states and 11236 transitions. [2023-12-02 14:56:58,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 14:56:58,144 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) Word has length 86 [2023-12-02 14:56:58,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:56:58,195 INFO L225 Difference]: With dead ends: 6967 [2023-12-02 14:56:58,195 INFO L226 Difference]: Without dead ends: 4505 [2023-12-02 14:56:58,224 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 87 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 14:56:58,225 INFO L413 NwaCegarLoop]: 606 mSDtfsCounter, 564 mSDsluCounter, 505 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 564 SdHoareTripleChecker+Valid, 1111 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 14:56:58,226 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [564 Valid, 1111 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 14:56:58,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4505 states. [2023-12-02 14:56:58,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4505 to 4295. [2023-12-02 14:56:58,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4295 states, 2983 states have (on average 1.499832383506537) internal successors, (4474), 3150 states have internal predecessors, (4474), 1015 states have call successors, (1015), 291 states have call predecessors, (1015), 296 states have return successors, (1264), 937 states have call predecessors, (1264), 1004 states have call successors, (1264) [2023-12-02 14:56:58,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4295 states to 4295 states and 6753 transitions. [2023-12-02 14:56:58,674 INFO L78 Accepts]: Start accepts. Automaton has 4295 states and 6753 transitions. Word has length 86 [2023-12-02 14:56:58,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:56:58,675 INFO L495 AbstractCegarLoop]: Abstraction has 4295 states and 6753 transitions. [2023-12-02 14:56:58,675 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) [2023-12-02 14:56:58,675 INFO L276 IsEmpty]: Start isEmpty. Operand 4295 states and 6753 transitions. [2023-12-02 14:56:58,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2023-12-02 14:56:58,680 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:56:58,680 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:56:58,690 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 14:56:58,881 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:56:58,881 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:56:58,882 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:56:58,882 INFO L85 PathProgramCache]: Analyzing trace with hash 606161869, now seen corresponding path program 1 times [2023-12-02 14:56:58,882 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:56:58,882 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [842242389] [2023-12-02 14:56:58,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:56:58,883 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:56:58,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:56:59,207 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 14:56:59,207 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:56:59,208 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [842242389] [2023-12-02 14:56:59,208 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [842242389] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:56:59,208 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1693259742] [2023-12-02 14:56:59,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:56:59,208 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:56:59,209 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:56:59,210 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:56:59,213 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 14:56:59,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:56:59,667 INFO L262 TraceCheckSpWp]: Trace formula consists of 1795 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 14:56:59,675 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:56:59,771 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:56:59,772 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:56:59,772 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1693259742] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:56:59,772 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:56:59,772 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-12-02 14:56:59,773 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1944973702] [2023-12-02 14:56:59,773 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:56:59,774 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 14:56:59,774 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:56:59,774 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 14:56:59,775 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-12-02 14:56:59,775 INFO L87 Difference]: Start difference. First operand 4295 states and 6753 transitions. Second operand has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) [2023-12-02 14:57:00,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:57:00,253 INFO L93 Difference]: Finished difference Result 9753 states and 15625 transitions. [2023-12-02 14:57:00,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 14:57:00,254 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) Word has length 86 [2023-12-02 14:57:00,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:57:00,340 INFO L225 Difference]: With dead ends: 9753 [2023-12-02 14:57:00,340 INFO L226 Difference]: Without dead ends: 5470 [2023-12-02 14:57:00,370 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 87 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 14:57:00,371 INFO L413 NwaCegarLoop]: 642 mSDtfsCounter, 562 mSDsluCounter, 504 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 562 SdHoareTripleChecker+Valid, 1146 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 14:57:00,372 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [562 Valid, 1146 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 87 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 14:57:00,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5470 states. [2023-12-02 14:57:00,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5470 to 5316. [2023-12-02 14:57:00,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5316 states, 3709 states have (on average 1.5020221083850094) internal successors, (5571), 3920 states have internal predecessors, (5571), 1235 states have call successors, (1235), 354 states have call predecessors, (1235), 371 states have return successors, (1574), 1147 states have call predecessors, (1574), 1224 states have call successors, (1574) [2023-12-02 14:57:00,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5316 states to 5316 states and 8380 transitions. [2023-12-02 14:57:00,793 INFO L78 Accepts]: Start accepts. Automaton has 5316 states and 8380 transitions. Word has length 86 [2023-12-02 14:57:00,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:57:00,794 INFO L495 AbstractCegarLoop]: Abstraction has 5316 states and 8380 transitions. [2023-12-02 14:57:00,795 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.666666666666668) internal successors, (56), 3 states have internal predecessors, (56), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (14), 3 states have call predecessors, (14), 3 states have call successors, (14) [2023-12-02 14:57:00,795 INFO L276 IsEmpty]: Start isEmpty. Operand 5316 states and 8380 transitions. [2023-12-02 14:57:00,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2023-12-02 14:57:00,800 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:57:00,800 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:57:00,810 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 14:57:01,009 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:57:01,010 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:57:01,010 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:57:01,010 INFO L85 PathProgramCache]: Analyzing trace with hash 623410034, now seen corresponding path program 1 times [2023-12-02 14:57:01,011 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:57:01,011 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [13931401] [2023-12-02 14:57:01,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:57:01,031 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:57:01,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:57:01,806 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 14:57:01,806 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:57:01,806 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [13931401] [2023-12-02 14:57:01,806 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [13931401] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:57:01,807 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [575465755] [2023-12-02 14:57:01,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:57:01,807 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:57:01,807 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:57:01,811 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:57:01,814 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 14:57:02,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:57:02,247 INFO L262 TraceCheckSpWp]: Trace formula consists of 1821 conjuncts, 6 conjunts are in the unsatisfiable core [2023-12-02 14:57:02,254 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:57:02,304 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 14:57:02,304 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:57:02,304 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [575465755] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:57:02,304 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:57:02,305 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10] total 13 [2023-12-02 14:57:02,305 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2103126715] [2023-12-02 14:57:02,305 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:57:02,305 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 14:57:02,306 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:57:02,306 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 14:57:02,307 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=130, Unknown=0, NotChecked=0, Total=156 [2023-12-02 14:57:02,307 INFO L87 Difference]: Start difference. First operand 5316 states and 8380 transitions. Second operand has 5 states, 5 states have (on average 11.6) internal successors, (58), 5 states have internal predecessors, (58), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 2 states have call predecessors, (16), 2 states have call successors, (16) [2023-12-02 14:57:03,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:57:03,039 INFO L93 Difference]: Finished difference Result 10485 states and 16892 transitions. [2023-12-02 14:57:03,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 14:57:03,040 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.6) internal successors, (58), 5 states have internal predecessors, (58), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 2 states have call predecessors, (16), 2 states have call successors, (16) Word has length 93 [2023-12-02 14:57:03,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:57:03,103 INFO L225 Difference]: With dead ends: 10485 [2023-12-02 14:57:03,103 INFO L226 Difference]: Without dead ends: 6396 [2023-12-02 14:57:03,130 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=174, Unknown=0, NotChecked=0, Total=210 [2023-12-02 14:57:03,131 INFO L413 NwaCegarLoop]: 597 mSDtfsCounter, 177 mSDsluCounter, 1786 mSDsCounter, 0 mSdLazyCounter, 165 mSolverCounterSat, 129 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 177 SdHoareTripleChecker+Valid, 2383 SdHoareTripleChecker+Invalid, 294 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 129 IncrementalHoareTripleChecker+Valid, 165 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 14:57:03,131 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [177 Valid, 2383 Invalid, 294 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [129 Valid, 165 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 14:57:03,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6396 states. [2023-12-02 14:57:03,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6396 to 5361. [2023-12-02 14:57:03,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5361 states, 3754 states have (on average 1.4960042621204048) internal successors, (5616), 3965 states have internal predecessors, (5616), 1235 states have call successors, (1235), 354 states have call predecessors, (1235), 371 states have return successors, (1574), 1147 states have call predecessors, (1574), 1224 states have call successors, (1574) [2023-12-02 14:57:03,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5361 states to 5361 states and 8425 transitions. [2023-12-02 14:57:03,594 INFO L78 Accepts]: Start accepts. Automaton has 5361 states and 8425 transitions. Word has length 93 [2023-12-02 14:57:03,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:57:03,595 INFO L495 AbstractCegarLoop]: Abstraction has 5361 states and 8425 transitions. [2023-12-02 14:57:03,595 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.6) internal successors, (58), 5 states have internal predecessors, (58), 2 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (16), 2 states have call predecessors, (16), 2 states have call successors, (16) [2023-12-02 14:57:03,595 INFO L276 IsEmpty]: Start isEmpty. Operand 5361 states and 8425 transitions. [2023-12-02 14:57:03,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2023-12-02 14:57:03,600 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:57:03,600 INFO L195 NwaCegarLoop]: trace histogram [3, 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] [2023-12-02 14:57:03,610 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 14:57:03,810 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:57:03,810 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:57:03,811 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:57:03,811 INFO L85 PathProgramCache]: Analyzing trace with hash -75363410, now seen corresponding path program 1 times [2023-12-02 14:57:03,811 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:57:03,811 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1675147800] [2023-12-02 14:57:03,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:57:03,811 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:57:03,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:57:04,488 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-12-02 14:57:04,489 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:57:04,489 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1675147800] [2023-12-02 14:57:04,489 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1675147800] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:57:04,489 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [454521692] [2023-12-02 14:57:04,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:57:04,489 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:57:04,490 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:57:04,491 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:57:04,494 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 14:57:04,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:57:04,895 INFO L262 TraceCheckSpWp]: Trace formula consists of 1827 conjuncts, 10 conjunts are in the unsatisfiable core [2023-12-02 14:57:04,902 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:57:05,156 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 14:57:05,157 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:57:05,773 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-12-02 14:57:05,773 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [454521692] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 14:57:05,773 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 14:57:05,774 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [10, 9] total 22 [2023-12-02 14:57:05,774 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1334785075] [2023-12-02 14:57:05,774 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:57:05,774 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-12-02 14:57:05,774 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:57:05,775 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-12-02 14:57:05,775 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=405, Unknown=0, NotChecked=0, Total=462 [2023-12-02 14:57:05,776 INFO L87 Difference]: Start difference. First operand 5361 states and 8425 transitions. Second operand has 9 states, 9 states have (on average 6.111111111111111) internal successors, (55), 9 states have internal predecessors, (55), 7 states have call successors, (19), 4 states have call predecessors, (19), 5 states have return successors, (17), 7 states have call predecessors, (17), 7 states have call successors, (17) [2023-12-02 14:57:08,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:57:08,850 INFO L93 Difference]: Finished difference Result 10547 states and 16774 transitions. [2023-12-02 14:57:08,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-12-02 14:57:08,851 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 6.111111111111111) internal successors, (55), 9 states have internal predecessors, (55), 7 states have call successors, (19), 4 states have call predecessors, (19), 5 states have return successors, (17), 7 states have call predecessors, (17), 7 states have call successors, (17) Word has length 95 [2023-12-02 14:57:08,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:57:08,904 INFO L225 Difference]: With dead ends: 10547 [2023-12-02 14:57:08,905 INFO L226 Difference]: Without dead ends: 6437 [2023-12-02 14:57:08,924 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 177 SyntacticMatches, 3 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=127, Invalid=865, Unknown=0, NotChecked=0, Total=992 [2023-12-02 14:57:08,925 INFO L413 NwaCegarLoop]: 665 mSDtfsCounter, 1425 mSDsluCounter, 2270 mSDsCounter, 0 mSdLazyCounter, 2443 mSolverCounterSat, 339 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1512 SdHoareTripleChecker+Valid, 2935 SdHoareTripleChecker+Invalid, 2782 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 339 IncrementalHoareTripleChecker+Valid, 2443 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2023-12-02 14:57:08,925 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1512 Valid, 2935 Invalid, 2782 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [339 Valid, 2443 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2023-12-02 14:57:08,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6437 states. [2023-12-02 14:57:09,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6437 to 5601. [2023-12-02 14:57:09,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5601 states, 3908 states have (on average 1.4820880245649948) internal successors, (5792), 4119 states have internal predecessors, (5792), 1276 states have call successors, (1276), 360 states have call predecessors, (1276), 416 states have return successors, (1746), 1224 states have call predecessors, (1746), 1265 states have call successors, (1746) [2023-12-02 14:57:09,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5601 states to 5601 states and 8814 transitions. [2023-12-02 14:57:09,397 INFO L78 Accepts]: Start accepts. Automaton has 5601 states and 8814 transitions. Word has length 95 [2023-12-02 14:57:09,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:57:09,398 INFO L495 AbstractCegarLoop]: Abstraction has 5601 states and 8814 transitions. [2023-12-02 14:57:09,398 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 6.111111111111111) internal successors, (55), 9 states have internal predecessors, (55), 7 states have call successors, (19), 4 states have call predecessors, (19), 5 states have return successors, (17), 7 states have call predecessors, (17), 7 states have call successors, (17) [2023-12-02 14:57:09,398 INFO L276 IsEmpty]: Start isEmpty. Operand 5601 states and 8814 transitions. [2023-12-02 14:57:09,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2023-12-02 14:57:09,404 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:57:09,405 INFO L195 NwaCegarLoop]: trace histogram [3, 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] [2023-12-02 14:57:09,414 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 14:57:09,609 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:57:09,609 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:57:09,610 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:57:09,610 INFO L85 PathProgramCache]: Analyzing trace with hash -919391634, now seen corresponding path program 1 times [2023-12-02 14:57:09,610 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:57:09,610 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [177469611] [2023-12-02 14:57:09,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:57:09,610 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:57:09,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:57:10,164 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-12-02 14:57:10,164 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:57:10,165 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [177469611] [2023-12-02 14:57:10,165 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [177469611] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:57:10,165 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1177914704] [2023-12-02 14:57:10,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:57:10,165 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:57:10,165 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:57:10,166 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:57:10,170 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 14:57:10,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:57:10,592 INFO L262 TraceCheckSpWp]: Trace formula consists of 1826 conjuncts, 5 conjunts are in the unsatisfiable core [2023-12-02 14:57:10,598 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:57:10,643 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 14:57:10,643 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:57:10,644 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1177914704] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:57:10,644 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:57:10,644 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [10] total 12 [2023-12-02 14:57:10,644 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1362916579] [2023-12-02 14:57:10,644 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:57:10,645 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 14:57:10,645 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:57:10,645 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 14:57:10,646 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2023-12-02 14:57:10,646 INFO L87 Difference]: Start difference. First operand 5601 states and 8814 transitions. Second operand has 4 states, 4 states have (on average 14.75) internal successors, (59), 4 states have internal predecessors, (59), 3 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2023-12-02 14:57:11,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:57:11,179 INFO L93 Difference]: Finished difference Result 10491 states and 17034 transitions. [2023-12-02 14:57:11,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 14:57:11,180 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.75) internal successors, (59), 4 states have internal predecessors, (59), 3 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) Word has length 98 [2023-12-02 14:57:11,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:57:11,212 INFO L225 Difference]: With dead ends: 10491 [2023-12-02 14:57:11,212 INFO L226 Difference]: Without dead ends: 6141 [2023-12-02 14:57:11,232 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 98 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 14:57:11,233 INFO L413 NwaCegarLoop]: 639 mSDtfsCounter, 219 mSDsluCounter, 982 mSDsCounter, 0 mSdLazyCounter, 175 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 220 SdHoareTripleChecker+Valid, 1621 SdHoareTripleChecker+Invalid, 211 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 175 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 14:57:11,234 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [220 Valid, 1621 Invalid, 211 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 175 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 14:57:11,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6141 states. [2023-12-02 14:57:11,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6141 to 6141. [2023-12-02 14:57:11,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6141 states, 4427 states have (on average 1.497854077253219) internal successors, (6631), 4659 states have internal predecessors, (6631), 1276 states have call successors, (1276), 360 states have call predecessors, (1276), 437 states have return successors, (1802), 1224 states have call predecessors, (1802), 1265 states have call successors, (1802) [2023-12-02 14:57:11,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6141 states to 6141 states and 9709 transitions. [2023-12-02 14:57:11,749 INFO L78 Accepts]: Start accepts. Automaton has 6141 states and 9709 transitions. Word has length 98 [2023-12-02 14:57:11,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:57:11,749 INFO L495 AbstractCegarLoop]: Abstraction has 6141 states and 9709 transitions. [2023-12-02 14:57:11,750 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.75) internal successors, (59), 4 states have internal predecessors, (59), 3 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2023-12-02 14:57:11,750 INFO L276 IsEmpty]: Start isEmpty. Operand 6141 states and 9709 transitions. [2023-12-02 14:57:11,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2023-12-02 14:57:11,756 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:57:11,756 INFO L195 NwaCegarLoop]: trace histogram [3, 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] [2023-12-02 14:57:11,766 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 14:57:11,960 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:57:11,960 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:57:11,961 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:57:11,961 INFO L85 PathProgramCache]: Analyzing trace with hash -1028465790, now seen corresponding path program 1 times [2023-12-02 14:57:11,961 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:57:11,961 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [601172785] [2023-12-02 14:57:11,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:57:11,961 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:57:11,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:57:12,502 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-12-02 14:57:12,503 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:57:12,503 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [601172785] [2023-12-02 14:57:12,503 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [601172785] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:57:12,503 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1233271711] [2023-12-02 14:57:12,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:57:12,503 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:57:12,503 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:57:12,504 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:57:12,509 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 14:57:12,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:57:12,899 INFO L262 TraceCheckSpWp]: Trace formula consists of 1826 conjuncts, 19 conjunts are in the unsatisfiable core [2023-12-02 14:57:12,903 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:57:13,129 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 14:57:13,130 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:57:13,534 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 14:57:13,534 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1233271711] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 14:57:13,534 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 14:57:13,534 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [10, 9] total 21 [2023-12-02 14:57:13,534 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1654710886] [2023-12-02 14:57:13,535 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:57:13,535 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-12-02 14:57:13,535 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:57:13,535 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-12-02 14:57:13,536 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=362, Unknown=0, NotChecked=0, Total=420 [2023-12-02 14:57:13,536 INFO L87 Difference]: Start difference. First operand 6141 states and 9709 transitions. Second operand has 10 states, 9 states have (on average 6.444444444444445) internal successors, (58), 9 states have internal predecessors, (58), 5 states have call successors, (19), 5 states have call predecessors, (19), 4 states have return successors, (17), 6 states have call predecessors, (17), 4 states have call successors, (17) [2023-12-02 14:57:17,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:57:17,481 INFO L93 Difference]: Finished difference Result 17783 states and 30826 transitions. [2023-12-02 14:57:17,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-12-02 14:57:17,482 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 6.444444444444445) internal successors, (58), 9 states have internal predecessors, (58), 5 states have call successors, (19), 5 states have call predecessors, (19), 4 states have return successors, (17), 6 states have call predecessors, (17), 4 states have call successors, (17) Word has length 97 [2023-12-02 14:57:17,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:57:17,554 INFO L225 Difference]: With dead ends: 17783 [2023-12-02 14:57:17,554 INFO L226 Difference]: Without dead ends: 13589 [2023-12-02 14:57:17,588 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 188 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=196, Invalid=1136, Unknown=0, NotChecked=0, Total=1332 [2023-12-02 14:57:17,588 INFO L413 NwaCegarLoop]: 699 mSDtfsCounter, 4199 mSDsluCounter, 2339 mSDsCounter, 0 mSdLazyCounter, 2155 mSolverCounterSat, 1950 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4298 SdHoareTripleChecker+Valid, 3038 SdHoareTripleChecker+Invalid, 4105 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1950 IncrementalHoareTripleChecker+Valid, 2155 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2023-12-02 14:57:17,589 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4298 Valid, 3038 Invalid, 4105 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1950 Valid, 2155 Invalid, 0 Unknown, 0 Unchecked, 2.9s Time] [2023-12-02 14:57:17,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13589 states. [2023-12-02 14:57:18,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13589 to 12128. [2023-12-02 14:57:18,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12128 states, 8883 states have (on average 1.5074862096138693) internal successors, (13391), 9288 states have internal predecessors, (13391), 2354 states have call successors, (2354), 684 states have call predecessors, (2354), 890 states have return successors, (4331), 2315 states have call predecessors, (4331), 2337 states have call successors, (4331) [2023-12-02 14:57:18,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12128 states to 12128 states and 20076 transitions. [2023-12-02 14:57:18,528 INFO L78 Accepts]: Start accepts. Automaton has 12128 states and 20076 transitions. Word has length 97 [2023-12-02 14:57:18,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:57:18,528 INFO L495 AbstractCegarLoop]: Abstraction has 12128 states and 20076 transitions. [2023-12-02 14:57:18,529 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 6.444444444444445) internal successors, (58), 9 states have internal predecessors, (58), 5 states have call successors, (19), 5 states have call predecessors, (19), 4 states have return successors, (17), 6 states have call predecessors, (17), 4 states have call successors, (17) [2023-12-02 14:57:18,529 INFO L276 IsEmpty]: Start isEmpty. Operand 12128 states and 20076 transitions. [2023-12-02 14:57:18,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2023-12-02 14:57:18,535 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:57:18,535 INFO L195 NwaCegarLoop]: trace histogram [3, 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] [2023-12-02 14:57:18,545 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-12-02 14:57:18,739 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-12-02 14:57:18,739 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:57:18,740 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:57:18,740 INFO L85 PathProgramCache]: Analyzing trace with hash -1356590826, now seen corresponding path program 1 times [2023-12-02 14:57:18,740 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:57:18,740 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1290238718] [2023-12-02 14:57:18,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:57:18,741 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:57:18,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:57:19,461 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-12-02 14:57:19,461 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:57:19,461 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1290238718] [2023-12-02 14:57:19,461 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1290238718] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:57:19,461 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1991474262] [2023-12-02 14:57:19,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:57:19,461 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:57:19,462 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:57:19,463 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:57:19,465 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 14:57:19,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:57:19,879 INFO L262 TraceCheckSpWp]: Trace formula consists of 1844 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 14:57:19,886 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:57:20,055 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 14:57:20,055 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:57:20,336 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-12-02 14:57:20,337 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1991474262] provided 1 perfect and 1 imperfect interpolant sequences [2023-12-02 14:57:20,337 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-12-02 14:57:20,337 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [10, 7] total 17 [2023-12-02 14:57:20,337 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [90642727] [2023-12-02 14:57:20,337 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:57:20,338 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 14:57:20,338 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:57:20,338 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 14:57:20,339 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272 [2023-12-02 14:57:20,339 INFO L87 Difference]: Start difference. First operand 12128 states and 20076 transitions. Second operand has 7 states, 7 states have (on average 8.571428571428571) internal successors, (60), 7 states have internal predecessors, (60), 5 states have call successors, (20), 4 states have call predecessors, (20), 4 states have return successors, (18), 6 states have call predecessors, (18), 5 states have call successors, (18) [2023-12-02 14:57:22,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:57:22,570 INFO L93 Difference]: Finished difference Result 23833 states and 40115 transitions. [2023-12-02 14:57:22,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 14:57:22,571 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 8.571428571428571) internal successors, (60), 7 states have internal predecessors, (60), 5 states have call successors, (20), 4 states have call predecessors, (20), 4 states have return successors, (18), 6 states have call predecessors, (18), 5 states have call successors, (18) Word has length 102 [2023-12-02 14:57:22,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:57:22,637 INFO L225 Difference]: With dead ends: 23833 [2023-12-02 14:57:22,637 INFO L226 Difference]: Without dead ends: 13652 [2023-12-02 14:57:22,676 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 195 SyntacticMatches, 4 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2023-12-02 14:57:22,677 INFO L413 NwaCegarLoop]: 617 mSDtfsCounter, 1212 mSDsluCounter, 1367 mSDsCounter, 0 mSdLazyCounter, 1666 mSolverCounterSat, 252 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1308 SdHoareTripleChecker+Valid, 1984 SdHoareTripleChecker+Invalid, 1918 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 252 IncrementalHoareTripleChecker+Valid, 1666 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2023-12-02 14:57:22,677 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1308 Valid, 1984 Invalid, 1918 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [252 Valid, 1666 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2023-12-02 14:57:22,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13652 states. [2023-12-02 14:57:23,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13652 to 12116. [2023-12-02 14:57:23,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12116 states, 8883 states have (on average 1.5074862096138693) internal successors, (13391), 9276 states have internal predecessors, (13391), 2342 states have call successors, (2342), 684 states have call predecessors, (2342), 890 states have return successors, (4295), 2315 states have call predecessors, (4295), 2325 states have call successors, (4295) [2023-12-02 14:57:23,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12116 states to 12116 states and 20028 transitions. [2023-12-02 14:57:23,515 INFO L78 Accepts]: Start accepts. Automaton has 12116 states and 20028 transitions. Word has length 102 [2023-12-02 14:57:23,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:57:23,516 INFO L495 AbstractCegarLoop]: Abstraction has 12116 states and 20028 transitions. [2023-12-02 14:57:23,516 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 8.571428571428571) internal successors, (60), 7 states have internal predecessors, (60), 5 states have call successors, (20), 4 states have call predecessors, (20), 4 states have return successors, (18), 6 states have call predecessors, (18), 5 states have call successors, (18) [2023-12-02 14:57:23,516 INFO L276 IsEmpty]: Start isEmpty. Operand 12116 states and 20028 transitions. [2023-12-02 14:57:23,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2023-12-02 14:57:23,522 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:57:23,522 INFO L195 NwaCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1, 1, 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 14:57:23,530 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 14:57:23,723 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-12-02 14:57:23,723 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:57:23,724 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:57:23,724 INFO L85 PathProgramCache]: Analyzing trace with hash 2017326133, now seen corresponding path program 1 times [2023-12-02 14:57:23,724 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:57:23,724 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1168220894] [2023-12-02 14:57:23,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:57:23,725 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:57:23,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:57:24,426 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2023-12-02 14:57:24,427 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:57:24,427 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1168220894] [2023-12-02 14:57:24,427 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1168220894] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:57:24,427 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1497178809] [2023-12-02 14:57:24,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:57:24,427 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:57:24,428 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:57:24,428 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:57:24,431 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 14:57:24,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:57:24,826 INFO L262 TraceCheckSpWp]: Trace formula consists of 1954 conjuncts, 8 conjunts are in the unsatisfiable core [2023-12-02 14:57:24,832 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:57:24,918 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 14:57:24,918 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:57:24,918 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1497178809] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:57:24,918 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:57:24,918 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [10] total 15 [2023-12-02 14:57:24,919 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1673015501] [2023-12-02 14:57:24,919 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:57:24,919 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 14:57:24,919 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:57:24,920 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 14:57:24,920 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2023-12-02 14:57:24,920 INFO L87 Difference]: Start difference. First operand 12116 states and 20028 transitions. Second operand has 7 states, 7 states have (on average 10.714285714285714) internal successors, (75), 5 states have internal predecessors, (75), 2 states have call successors, (25), 2 states have call predecessors, (25), 4 states have return successors, (23), 4 states have call predecessors, (23), 2 states have call successors, (23) [2023-12-02 14:57:25,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:57:25,965 INFO L93 Difference]: Finished difference Result 23527 states and 40365 transitions. [2023-12-02 14:57:25,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 14:57:25,966 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 10.714285714285714) internal successors, (75), 5 states have internal predecessors, (75), 2 states have call successors, (25), 2 states have call predecessors, (25), 4 states have return successors, (23), 4 states have call predecessors, (23), 2 states have call successors, (23) Word has length 128 [2023-12-02 14:57:25,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:57:26,034 INFO L225 Difference]: With dead ends: 23527 [2023-12-02 14:57:26,034 INFO L226 Difference]: Without dead ends: 12680 [2023-12-02 14:57:26,087 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2023-12-02 14:57:26,087 INFO L413 NwaCegarLoop]: 605 mSDtfsCounter, 2 mSDsluCounter, 2994 mSDsCounter, 0 mSdLazyCounter, 253 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 3599 SdHoareTripleChecker+Invalid, 270 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 253 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 14:57:26,088 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 3599 Invalid, 270 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 253 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 14:57:26,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12680 states. [2023-12-02 14:57:26,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12680 to 12554. [2023-12-02 14:57:26,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12554 states, 9159 states have (on average 1.492193470902937) internal successors, (13667), 9630 states have internal predecessors, (13667), 2342 states have call successors, (2342), 684 states have call predecessors, (2342), 1052 states have return successors, (5231), 2399 states have call predecessors, (5231), 2325 states have call successors, (5231) [2023-12-02 14:57:26,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12554 states to 12554 states and 21240 transitions. [2023-12-02 14:57:26,912 INFO L78 Accepts]: Start accepts. Automaton has 12554 states and 21240 transitions. Word has length 128 [2023-12-02 14:57:26,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:57:26,913 INFO L495 AbstractCegarLoop]: Abstraction has 12554 states and 21240 transitions. [2023-12-02 14:57:26,913 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 10.714285714285714) internal successors, (75), 5 states have internal predecessors, (75), 2 states have call successors, (25), 2 states have call predecessors, (25), 4 states have return successors, (23), 4 states have call predecessors, (23), 2 states have call successors, (23) [2023-12-02 14:57:26,913 INFO L276 IsEmpty]: Start isEmpty. Operand 12554 states and 21240 transitions. [2023-12-02 14:57:26,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2023-12-02 14:57:26,920 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:57:26,921 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:57:26,929 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-12-02 14:57:27,121 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-12-02 14:57:27,122 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:57:27,122 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:57:27,122 INFO L85 PathProgramCache]: Analyzing trace with hash 1267500167, now seen corresponding path program 1 times [2023-12-02 14:57:27,122 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:57:27,122 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [502491216] [2023-12-02 14:57:27,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:57:27,123 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:57:27,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:57:27,705 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-12-02 14:57:27,706 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:57:27,706 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [502491216] [2023-12-02 14:57:27,706 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [502491216] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:57:27,706 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1045507017] [2023-12-02 14:57:27,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:57:27,706 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:57:27,706 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:57:27,708 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:57:27,710 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 14:57:28,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:57:28,071 INFO L262 TraceCheckSpWp]: Trace formula consists of 1953 conjuncts, 8 conjunts are in the unsatisfiable core [2023-12-02 14:57:28,075 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:57:28,149 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 14:57:28,149 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:57:28,150 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1045507017] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:57:28,150 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:57:28,150 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [10] total 15 [2023-12-02 14:57:28,150 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1896857696] [2023-12-02 14:57:28,150 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:57:28,151 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 14:57:28,151 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:57:28,151 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 14:57:28,151 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2023-12-02 14:57:28,151 INFO L87 Difference]: Start difference. First operand 12554 states and 21240 transitions. Second operand has 7 states, 7 states have (on average 10.571428571428571) internal successors, (74), 5 states have internal predecessors, (74), 2 states have call successors, (25), 2 states have call predecessors, (25), 4 states have return successors, (23), 4 states have call predecessors, (23), 2 states have call successors, (23) [2023-12-02 14:57:29,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:57:29,020 INFO L93 Difference]: Finished difference Result 24175 states and 42031 transitions. [2023-12-02 14:57:29,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 14:57:29,021 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 10.571428571428571) internal successors, (74), 5 states have internal predecessors, (74), 2 states have call successors, (25), 2 states have call predecessors, (25), 4 states have return successors, (23), 4 states have call predecessors, (23), 2 states have call successors, (23) Word has length 127 [2023-12-02 14:57:29,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:57:29,080 INFO L225 Difference]: With dead ends: 24175 [2023-12-02 14:57:29,081 INFO L226 Difference]: Without dead ends: 12902 [2023-12-02 14:57:29,123 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2023-12-02 14:57:29,124 INFO L413 NwaCegarLoop]: 609 mSDtfsCounter, 2 mSDsluCounter, 3010 mSDsCounter, 0 mSdLazyCounter, 254 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 3619 SdHoareTripleChecker+Invalid, 271 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 254 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 14:57:29,124 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 3619 Invalid, 271 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 254 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 14:57:29,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12902 states. [2023-12-02 14:57:29,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12902 to 12608. [2023-12-02 14:57:29,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12608 states, 9213 states have (on average 1.489308585694128) internal successors, (13721), 9630 states have internal predecessors, (13721), 2342 states have call successors, (2342), 684 states have call predecessors, (2342), 1052 states have return successors, (5231), 2453 states have call predecessors, (5231), 2325 states have call successors, (5231) [2023-12-02 14:57:29,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12608 states to 12608 states and 21294 transitions. [2023-12-02 14:57:29,996 INFO L78 Accepts]: Start accepts. Automaton has 12608 states and 21294 transitions. Word has length 127 [2023-12-02 14:57:29,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:57:29,997 INFO L495 AbstractCegarLoop]: Abstraction has 12608 states and 21294 transitions. [2023-12-02 14:57:29,997 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 10.571428571428571) internal successors, (74), 5 states have internal predecessors, (74), 2 states have call successors, (25), 2 states have call predecessors, (25), 4 states have return successors, (23), 4 states have call predecessors, (23), 2 states have call successors, (23) [2023-12-02 14:57:29,997 INFO L276 IsEmpty]: Start isEmpty. Operand 12608 states and 21294 transitions. [2023-12-02 14:57:30,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2023-12-02 14:57:30,007 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:57:30,008 INFO L195 NwaCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1, 1, 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 14:57:30,015 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2023-12-02 14:57:30,208 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-12-02 14:57:30,209 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:57:30,209 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:57:30,209 INFO L85 PathProgramCache]: Analyzing trace with hash 1160818279, now seen corresponding path program 1 times [2023-12-02 14:57:30,210 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:57:30,210 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [833942664] [2023-12-02 14:57:30,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:57:30,210 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:57:30,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:57:30,903 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-12-02 14:57:30,903 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:57:30,903 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [833942664] [2023-12-02 14:57:30,903 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [833942664] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:57:30,903 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [279454623] [2023-12-02 14:57:30,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:57:30,904 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:57:30,904 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:57:30,905 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:57:30,906 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 14:57:31,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:57:31,258 INFO L262 TraceCheckSpWp]: Trace formula consists of 1954 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 14:57:31,264 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:57:31,284 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-12-02 14:57:31,284 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:57:31,284 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [279454623] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:57:31,284 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:57:31,284 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [10] total 11 [2023-12-02 14:57:31,285 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1540589102] [2023-12-02 14:57:31,285 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:57:31,285 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 14:57:31,285 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:57:31,286 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 14:57:31,286 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2023-12-02 14:57:31,286 INFO L87 Difference]: Start difference. First operand 12608 states and 21294 transitions. Second operand has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 3 states have internal predecessors, (94), 2 states have call successors, (23), 2 states have call predecessors, (23), 2 states have return successors, (21), 2 states have call predecessors, (21), 2 states have call successors, (21) [2023-12-02 14:57:32,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:57:32,141 INFO L93 Difference]: Finished difference Result 26245 states and 47550 transitions. [2023-12-02 14:57:32,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 14:57:32,141 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 3 states have internal predecessors, (94), 2 states have call successors, (23), 2 states have call predecessors, (23), 2 states have return successors, (21), 2 states have call predecessors, (21), 2 states have call successors, (21) Word has length 144 [2023-12-02 14:57:32,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:57:32,241 INFO L225 Difference]: With dead ends: 26245 [2023-12-02 14:57:32,242 INFO L226 Difference]: Without dead ends: 14888 [2023-12-02 14:57:32,365 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2023-12-02 14:57:32,366 INFO L413 NwaCegarLoop]: 654 mSDtfsCounter, 71 mSDsluCounter, 588 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 1242 SdHoareTripleChecker+Invalid, 104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:57:32,366 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [79 Valid, 1242 Invalid, 104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 92 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:57:32,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14888 states. [2023-12-02 14:57:33,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14888 to 14131. [2023-12-02 14:57:33,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14131 states, 10592 states have (on average 1.4937688821752266) internal successors, (15822), 11013 states have internal predecessors, (15822), 2482 states have call successors, (2482), 684 states have call predecessors, (2482), 1056 states have return successors, (5391), 2593 states have call predecessors, (5391), 2465 states have call successors, (5391) [2023-12-02 14:57:33,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14131 states to 14131 states and 23695 transitions. [2023-12-02 14:57:33,134 INFO L78 Accepts]: Start accepts. Automaton has 14131 states and 23695 transitions. Word has length 144 [2023-12-02 14:57:33,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:57:33,135 INFO L495 AbstractCegarLoop]: Abstraction has 14131 states and 23695 transitions. [2023-12-02 14:57:33,135 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.333333333333332) internal successors, (94), 3 states have internal predecessors, (94), 2 states have call successors, (23), 2 states have call predecessors, (23), 2 states have return successors, (21), 2 states have call predecessors, (21), 2 states have call successors, (21) [2023-12-02 14:57:33,135 INFO L276 IsEmpty]: Start isEmpty. Operand 14131 states and 23695 transitions. [2023-12-02 14:57:33,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2023-12-02 14:57:33,141 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:57:33,142 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:57:33,149 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-12-02 14:57:33,342 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-12-02 14:57:33,343 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:57:33,343 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:57:33,343 INFO L85 PathProgramCache]: Analyzing trace with hash -1362339264, now seen corresponding path program 1 times [2023-12-02 14:57:33,343 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:57:33,343 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [937537327] [2023-12-02 14:57:33,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:57:33,344 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:57:33,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:57:33,866 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-12-02 14:57:33,867 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:57:33,867 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [937537327] [2023-12-02 14:57:33,867 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [937537327] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:57:33,867 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [325989666] [2023-12-02 14:57:33,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:57:33,867 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:57:33,867 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:57:33,868 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:57:33,869 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-12-02 14:57:34,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:57:34,232 INFO L262 TraceCheckSpWp]: Trace formula consists of 1955 conjuncts, 8 conjunts are in the unsatisfiable core [2023-12-02 14:57:34,237 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:57:34,302 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 19 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-12-02 14:57:34,302 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:57:34,302 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [325989666] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:57:34,302 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:57:34,302 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [10] total 15 [2023-12-02 14:57:34,303 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [85864528] [2023-12-02 14:57:34,303 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:57:34,303 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 14:57:34,303 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:57:34,304 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 14:57:34,304 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2023-12-02 14:57:34,304 INFO L87 Difference]: Start difference. First operand 14131 states and 23695 transitions. Second operand has 7 states, 7 states have (on average 13.857142857142858) internal successors, (97), 5 states have internal predecessors, (97), 2 states have call successors, (23), 2 states have call predecessors, (23), 4 states have return successors, (21), 4 states have call predecessors, (21), 2 states have call successors, (21) [2023-12-02 14:57:35,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:57:35,111 INFO L93 Difference]: Finished difference Result 27329 states and 46941 transitions. [2023-12-02 14:57:35,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 14:57:35,112 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 13.857142857142858) internal successors, (97), 5 states have internal predecessors, (97), 2 states have call successors, (23), 2 states have call predecessors, (23), 4 states have return successors, (21), 4 states have call predecessors, (21), 2 states have call successors, (21) Word has length 145 [2023-12-02 14:57:35,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:57:35,184 INFO L225 Difference]: With dead ends: 27329 [2023-12-02 14:57:35,184 INFO L226 Difference]: Without dead ends: 14479 [2023-12-02 14:57:35,239 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2023-12-02 14:57:35,239 INFO L413 NwaCegarLoop]: 609 mSDtfsCounter, 2 mSDsluCounter, 3010 mSDsCounter, 0 mSdLazyCounter, 254 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 3619 SdHoareTripleChecker+Invalid, 271 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 254 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 14:57:35,240 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 3619 Invalid, 271 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 254 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 14:57:35,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14479 states. [2023-12-02 14:57:35,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14479 to 14185. [2023-12-02 14:57:36,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14185 states, 10646 states have (on average 1.4912643246289685) internal successors, (15876), 11013 states have internal predecessors, (15876), 2482 states have call successors, (2482), 684 states have call predecessors, (2482), 1056 states have return successors, (5391), 2647 states have call predecessors, (5391), 2465 states have call successors, (5391) [2023-12-02 14:57:36,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14185 states to 14185 states and 23749 transitions. [2023-12-02 14:57:36,086 INFO L78 Accepts]: Start accepts. Automaton has 14185 states and 23749 transitions. Word has length 145 [2023-12-02 14:57:36,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:57:36,086 INFO L495 AbstractCegarLoop]: Abstraction has 14185 states and 23749 transitions. [2023-12-02 14:57:36,087 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 13.857142857142858) internal successors, (97), 5 states have internal predecessors, (97), 2 states have call successors, (23), 2 states have call predecessors, (23), 4 states have return successors, (21), 4 states have call predecessors, (21), 2 states have call successors, (21) [2023-12-02 14:57:36,087 INFO L276 IsEmpty]: Start isEmpty. Operand 14185 states and 23749 transitions. [2023-12-02 14:57:36,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2023-12-02 14:57:36,094 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:57:36,094 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:57:36,102 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2023-12-02 14:57:36,295 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:57:36,295 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:57:36,295 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:57:36,295 INFO L85 PathProgramCache]: Analyzing trace with hash 1482910152, now seen corresponding path program 1 times [2023-12-02 14:57:36,296 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:57:36,296 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1462773921] [2023-12-02 14:57:36,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:57:36,296 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:57:36,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:57:36,712 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-12-02 14:57:36,712 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:57:36,712 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1462773921] [2023-12-02 14:57:36,713 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1462773921] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:57:36,713 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1505994928] [2023-12-02 14:57:36,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:57:36,713 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:57:36,713 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:57:36,714 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:57:36,716 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-12-02 14:57:37,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:57:37,073 INFO L262 TraceCheckSpWp]: Trace formula consists of 1959 conjuncts, 5 conjunts are in the unsatisfiable core [2023-12-02 14:57:37,077 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:57:37,148 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 14:57:37,148 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:57:37,149 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1505994928] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:57:37,149 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:57:37,149 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [10] total 14 [2023-12-02 14:57:37,149 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [112524976] [2023-12-02 14:57:37,149 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:57:37,150 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 14:57:37,150 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:57:37,151 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 14:57:37,151 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=154, Unknown=0, NotChecked=0, Total=182 [2023-12-02 14:57:37,151 INFO L87 Difference]: Start difference. First operand 14185 states and 23749 transitions. Second operand has 6 states, 6 states have (on average 14.5) internal successors, (87), 6 states have internal predecessors, (87), 3 states have call successors, (24), 2 states have call predecessors, (24), 4 states have return successors, (22), 3 states have call predecessors, (22), 3 states have call successors, (22) [2023-12-02 14:57:38,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:57:38,339 INFO L93 Difference]: Finished difference Result 28305 states and 48706 transitions. [2023-12-02 14:57:38,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 14:57:38,340 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 14.5) internal successors, (87), 6 states have internal predecessors, (87), 3 states have call successors, (24), 2 states have call predecessors, (24), 4 states have return successors, (22), 3 states have call predecessors, (22), 3 states have call successors, (22) Word has length 138 [2023-12-02 14:57:38,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:57:38,418 INFO L225 Difference]: With dead ends: 28305 [2023-12-02 14:57:38,418 INFO L226 Difference]: Without dead ends: 12300 [2023-12-02 14:57:38,499 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=204, Unknown=0, NotChecked=0, Total=240 [2023-12-02 14:57:38,500 INFO L413 NwaCegarLoop]: 633 mSDtfsCounter, 220 mSDsluCounter, 2276 mSDsCounter, 0 mSdLazyCounter, 308 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 234 SdHoareTripleChecker+Valid, 2909 SdHoareTripleChecker+Invalid, 330 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 308 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 14:57:38,501 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [234 Valid, 2909 Invalid, 330 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 308 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 14:57:38,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12300 states. [2023-12-02 14:57:39,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12300 to 12267. [2023-12-02 14:57:39,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12267 states, 8942 states have (on average 1.443748602102438) internal successors, (12910), 9303 states have internal predecessors, (12910), 2298 states have call successors, (2298), 678 states have call predecessors, (2298), 1026 states have return successors, (5054), 2445 states have call predecessors, (5054), 2281 states have call successors, (5054) [2023-12-02 14:57:39,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12267 states to 12267 states and 20262 transitions. [2023-12-02 14:57:39,411 INFO L78 Accepts]: Start accepts. Automaton has 12267 states and 20262 transitions. Word has length 138 [2023-12-02 14:57:39,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:57:39,412 INFO L495 AbstractCegarLoop]: Abstraction has 12267 states and 20262 transitions. [2023-12-02 14:57:39,412 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 14.5) internal successors, (87), 6 states have internal predecessors, (87), 3 states have call successors, (24), 2 states have call predecessors, (24), 4 states have return successors, (22), 3 states have call predecessors, (22), 3 states have call successors, (22) [2023-12-02 14:57:39,412 INFO L276 IsEmpty]: Start isEmpty. Operand 12267 states and 20262 transitions. [2023-12-02 14:57:39,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2023-12-02 14:57:39,419 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:57:39,419 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:57:39,427 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2023-12-02 14:57:39,620 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-12-02 14:57:39,620 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:57:39,620 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:57:39,621 INFO L85 PathProgramCache]: Analyzing trace with hash 1763342616, now seen corresponding path program 1 times [2023-12-02 14:57:39,621 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:57:39,621 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [597612672] [2023-12-02 14:57:39,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:57:39,621 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:57:39,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:57:40,023 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-12-02 14:57:40,023 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:57:40,023 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [597612672] [2023-12-02 14:57:40,023 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [597612672] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:57:40,024 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [840504505] [2023-12-02 14:57:40,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:57:40,024 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:57:40,024 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:57:40,025 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:57:40,025 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-12-02 14:57:40,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:57:40,351 INFO L262 TraceCheckSpWp]: Trace formula consists of 1963 conjuncts, 5 conjunts are in the unsatisfiable core [2023-12-02 14:57:40,356 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:57:40,422 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 14:57:40,422 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:57:40,422 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [840504505] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:57:40,422 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:57:40,422 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [10] total 14 [2023-12-02 14:57:40,422 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1059728577] [2023-12-02 14:57:40,423 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:57:40,423 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 14:57:40,423 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:57:40,424 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 14:57:40,424 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=154, Unknown=0, NotChecked=0, Total=182 [2023-12-02 14:57:40,424 INFO L87 Difference]: Start difference. First operand 12267 states and 20262 transitions. Second operand has 6 states, 6 states have (on average 15.166666666666666) internal successors, (91), 6 states have internal predecessors, (91), 3 states have call successors, (24), 2 states have call predecessors, (24), 4 states have return successors, (22), 3 states have call predecessors, (22), 3 states have call successors, (22) [2023-12-02 14:57:41,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:57:41,415 INFO L93 Difference]: Finished difference Result 26876 states and 45510 transitions. [2023-12-02 14:57:41,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 14:57:41,416 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 15.166666666666666) internal successors, (91), 6 states have internal predecessors, (91), 3 states have call successors, (24), 2 states have call predecessors, (24), 4 states have return successors, (22), 3 states have call predecessors, (22), 3 states have call successors, (22) Word has length 142 [2023-12-02 14:57:41,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:57:41,484 INFO L225 Difference]: With dead ends: 26876 [2023-12-02 14:57:41,485 INFO L226 Difference]: Without dead ends: 13571 [2023-12-02 14:57:41,541 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 140 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=204, Unknown=0, NotChecked=0, Total=240 [2023-12-02 14:57:41,542 INFO L413 NwaCegarLoop]: 607 mSDtfsCounter, 304 mSDsluCounter, 2208 mSDsCounter, 0 mSdLazyCounter, 324 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 318 SdHoareTripleChecker+Valid, 2815 SdHoareTripleChecker+Invalid, 355 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 324 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 14:57:41,542 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [318 Valid, 2815 Invalid, 355 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 324 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 14:57:41,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13571 states. [2023-12-02 14:57:42,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13571 to 13457. [2023-12-02 14:57:42,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13457 states, 10051 states have (on average 1.439458760322356) internal successors, (14468), 10411 states have internal predecessors, (14468), 2338 states have call successors, (2338), 720 states have call predecessors, (2338), 1067 states have return successors, (4714), 2485 states have call predecessors, (4714), 2321 states have call successors, (4714) [2023-12-02 14:57:42,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13457 states to 13457 states and 21520 transitions. [2023-12-02 14:57:42,269 INFO L78 Accepts]: Start accepts. Automaton has 13457 states and 21520 transitions. Word has length 142 [2023-12-02 14:57:42,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:57:42,270 INFO L495 AbstractCegarLoop]: Abstraction has 13457 states and 21520 transitions. [2023-12-02 14:57:42,270 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 15.166666666666666) internal successors, (91), 6 states have internal predecessors, (91), 3 states have call successors, (24), 2 states have call predecessors, (24), 4 states have return successors, (22), 3 states have call predecessors, (22), 3 states have call successors, (22) [2023-12-02 14:57:42,270 INFO L276 IsEmpty]: Start isEmpty. Operand 13457 states and 21520 transitions. [2023-12-02 14:57:42,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2023-12-02 14:57:42,278 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:57:42,278 INFO L195 NwaCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:57:42,285 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2023-12-02 14:57:42,478 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-12-02 14:57:42,479 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:57:42,479 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:57:42,479 INFO L85 PathProgramCache]: Analyzing trace with hash -1243450008, now seen corresponding path program 1 times [2023-12-02 14:57:42,479 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:57:42,479 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [285618246] [2023-12-02 14:57:42,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:57:42,479 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:57:42,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:57:42,917 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2023-12-02 14:57:42,917 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:57:42,917 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [285618246] [2023-12-02 14:57:42,918 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [285618246] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:57:42,918 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1803772648] [2023-12-02 14:57:42,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:57:42,918 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:57:42,918 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:57:42,919 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:57:42,919 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2023-12-02 14:57:43,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:57:43,256 INFO L262 TraceCheckSpWp]: Trace formula consists of 1963 conjuncts, 16 conjunts are in the unsatisfiable core [2023-12-02 14:57:43,260 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:57:43,515 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-12-02 14:57:43,516 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:57:43,516 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1803772648] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:57:43,516 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:57:43,516 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [10] total 11 [2023-12-02 14:57:43,516 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [167936274] [2023-12-02 14:57:43,516 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:57:43,516 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 14:57:43,517 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:57:43,517 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 14:57:43,517 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2023-12-02 14:57:43,518 INFO L87 Difference]: Start difference. First operand 13457 states and 21520 transitions. Second operand has 6 states, 5 states have (on average 18.2) internal successors, (91), 5 states have internal predecessors, (91), 3 states have call successors, (24), 3 states have call predecessors, (24), 3 states have return successors, (22), 3 states have call predecessors, (22), 3 states have call successors, (22) [2023-12-02 14:57:45,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:57:45,309 INFO L93 Difference]: Finished difference Result 34779 states and 58355 transitions. [2023-12-02 14:57:45,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 14:57:45,310 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 18.2) internal successors, (91), 5 states have internal predecessors, (91), 3 states have call successors, (24), 3 states have call predecessors, (24), 3 states have return successors, (22), 3 states have call predecessors, (22), 3 states have call successors, (22) Word has length 143 [2023-12-02 14:57:45,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:57:45,435 INFO L225 Difference]: With dead ends: 34779 [2023-12-02 14:57:45,436 INFO L226 Difference]: Without dead ends: 21254 [2023-12-02 14:57:45,501 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2023-12-02 14:57:45,502 INFO L413 NwaCegarLoop]: 667 mSDtfsCounter, 594 mSDsluCounter, 2260 mSDsCounter, 0 mSdLazyCounter, 477 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 608 SdHoareTripleChecker+Valid, 2927 SdHoareTripleChecker+Invalid, 494 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 477 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 14:57:45,502 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [608 Valid, 2927 Invalid, 494 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 477 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 14:57:45,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21254 states. [2023-12-02 14:57:46,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21254 to 20761. [2023-12-02 14:57:46,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20761 states, 15509 states have (on average 1.4358759430008383) internal successors, (22269), 16107 states have internal predecessors, (22269), 3575 states have call successors, (3575), 1133 states have call predecessors, (3575), 1676 states have return successors, (8388), 3778 states have call predecessors, (8388), 3553 states have call successors, (8388) [2023-12-02 14:57:46,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20761 states to 20761 states and 34232 transitions. [2023-12-02 14:57:46,778 INFO L78 Accepts]: Start accepts. Automaton has 20761 states and 34232 transitions. Word has length 143 [2023-12-02 14:57:46,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:57:46,778 INFO L495 AbstractCegarLoop]: Abstraction has 20761 states and 34232 transitions. [2023-12-02 14:57:46,778 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 18.2) internal successors, (91), 5 states have internal predecessors, (91), 3 states have call successors, (24), 3 states have call predecessors, (24), 3 states have return successors, (22), 3 states have call predecessors, (22), 3 states have call successors, (22) [2023-12-02 14:57:46,778 INFO L276 IsEmpty]: Start isEmpty. Operand 20761 states and 34232 transitions. [2023-12-02 14:57:46,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2023-12-02 14:57:46,787 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:57:46,788 INFO L195 NwaCegarLoop]: trace histogram [4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:57:46,795 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2023-12-02 14:57:46,988 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-12-02 14:57:46,988 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:57:46,989 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:57:46,989 INFO L85 PathProgramCache]: Analyzing trace with hash 227650318, now seen corresponding path program 1 times [2023-12-02 14:57:46,989 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:57:46,989 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1685697856] [2023-12-02 14:57:46,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:57:46,989 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:57:47,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:57:47,454 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 9 proven. 1 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2023-12-02 14:57:47,454 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:57:47,454 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1685697856] [2023-12-02 14:57:47,454 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1685697856] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:57:47,454 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [402152167] [2023-12-02 14:57:47,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:57:47,455 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:57:47,455 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:57:47,456 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:57:47,459 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2023-12-02 14:57:47,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:57:47,771 INFO L262 TraceCheckSpWp]: Trace formula consists of 1978 conjuncts, 16 conjunts are in the unsatisfiable core [2023-12-02 14:57:47,775 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:57:48,019 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-12-02 14:57:48,020 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:57:48,020 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [402152167] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:57:48,020 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:57:48,020 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [12] total 16 [2023-12-02 14:57:48,020 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [833670032] [2023-12-02 14:57:48,020 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:57:48,021 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 14:57:48,021 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:57:48,022 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 14:57:48,022 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=208, Unknown=0, NotChecked=0, Total=240 [2023-12-02 14:57:48,022 INFO L87 Difference]: Start difference. First operand 20761 states and 34232 transitions. Second operand has 6 states, 5 states have (on average 19.0) internal successors, (95), 5 states have internal predecessors, (95), 3 states have call successors, (25), 3 states have call predecessors, (25), 3 states have return successors, (23), 3 states have call predecessors, (23), 3 states have call successors, (23) [2023-12-02 14:57:50,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:57:50,991 INFO L93 Difference]: Finished difference Result 56499 states and 100516 transitions. [2023-12-02 14:57:50,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 14:57:50,991 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 19.0) internal successors, (95), 5 states have internal predecessors, (95), 3 states have call successors, (25), 3 states have call predecessors, (25), 3 states have return successors, (23), 3 states have call predecessors, (23), 3 states have call successors, (23) Word has length 152 [2023-12-02 14:57:50,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:57:51,233 INFO L225 Difference]: With dead ends: 56499 [2023-12-02 14:57:51,234 INFO L226 Difference]: Without dead ends: 35670 [2023-12-02 14:57:51,358 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 150 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=40, Invalid=266, Unknown=0, NotChecked=0, Total=306 [2023-12-02 14:57:51,358 INFO L413 NwaCegarLoop]: 679 mSDtfsCounter, 572 mSDsluCounter, 2399 mSDsCounter, 0 mSdLazyCounter, 507 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 584 SdHoareTripleChecker+Valid, 3078 SdHoareTripleChecker+Invalid, 519 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 507 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 14:57:51,359 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [584 Valid, 3078 Invalid, 519 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 507 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 14:57:51,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35670 states. [2023-12-02 14:57:53,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35670 to 35106. [2023-12-02 14:57:53,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35106 states, 26284 states have (on average 1.4317455486227362) internal successors, (37632), 27330 states have internal predecessors, (37632), 5956 states have call successors, (5956), 1920 states have call predecessors, (5956), 2865 states have return successors, (17654), 6295 states have call predecessors, (17654), 5925 states have call successors, (17654) [2023-12-02 14:57:53,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35106 states to 35106 states and 61242 transitions. [2023-12-02 14:57:53,661 INFO L78 Accepts]: Start accepts. Automaton has 35106 states and 61242 transitions. Word has length 152 [2023-12-02 14:57:53,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:57:53,662 INFO L495 AbstractCegarLoop]: Abstraction has 35106 states and 61242 transitions. [2023-12-02 14:57:53,662 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 19.0) internal successors, (95), 5 states have internal predecessors, (95), 3 states have call successors, (25), 3 states have call predecessors, (25), 3 states have return successors, (23), 3 states have call predecessors, (23), 3 states have call successors, (23) [2023-12-02 14:57:53,662 INFO L276 IsEmpty]: Start isEmpty. Operand 35106 states and 61242 transitions. [2023-12-02 14:57:53,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2023-12-02 14:57:53,673 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:57:53,673 INFO L195 NwaCegarLoop]: trace histogram [5, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 14:57:53,681 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2023-12-02 14:57:53,873 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:57:53,874 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:57:53,874 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:57:53,874 INFO L85 PathProgramCache]: Analyzing trace with hash -1690222974, now seen corresponding path program 1 times [2023-12-02 14:57:53,874 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:57:53,874 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [27532453] [2023-12-02 14:57:53,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:57:53,875 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:57:53,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:57:54,915 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2023-12-02 14:57:54,915 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:57:54,915 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [27532453] [2023-12-02 14:57:54,916 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [27532453] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:57:54,916 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1659224220] [2023-12-02 14:57:54,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:57:54,916 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:57:54,916 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:57:54,917 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:57:54,918 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2023-12-02 14:57:55,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:57:55,263 INFO L262 TraceCheckSpWp]: Trace formula consists of 1994 conjuncts, 16 conjunts are in the unsatisfiable core [2023-12-02 14:57:55,267 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:57:55,506 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-12-02 14:57:55,506 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:57:55,507 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1659224220] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:57:55,507 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:57:55,507 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [7] total 11 [2023-12-02 14:57:55,507 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1824528127] [2023-12-02 14:57:55,507 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:57:55,508 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-12-02 14:57:55,508 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:57:55,509 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-12-02 14:57:55,509 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110 [2023-12-02 14:57:55,509 INFO L87 Difference]: Start difference. First operand 35106 states and 61242 transitions. Second operand has 6 states, 5 states have (on average 19.6) internal successors, (98), 5 states have internal predecessors, (98), 3 states have call successors, (26), 3 states have call predecessors, (26), 3 states have return successors, (24), 3 states have call predecessors, (24), 3 states have call successors, (24) [2023-12-02 14:57:59,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:57:59,878 INFO L93 Difference]: Finished difference Result 98586 states and 189943 transitions. [2023-12-02 14:57:59,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 14:57:59,878 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 19.6) internal successors, (98), 5 states have internal predecessors, (98), 3 states have call successors, (26), 3 states have call predecessors, (26), 3 states have return successors, (24), 3 states have call predecessors, (24), 3 states have call successors, (24) Word has length 158 [2023-12-02 14:57:59,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:58:00,395 INFO L225 Difference]: With dead ends: 98586 [2023-12-02 14:58:00,395 INFO L226 Difference]: Without dead ends: 63412 [2023-12-02 14:58:00,833 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 156 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2023-12-02 14:58:00,833 INFO L413 NwaCegarLoop]: 683 mSDtfsCounter, 558 mSDsluCounter, 2413 mSDsCounter, 0 mSdLazyCounter, 507 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 568 SdHoareTripleChecker+Valid, 3096 SdHoareTripleChecker+Invalid, 518 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 507 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-12-02 14:58:00,834 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [568 Valid, 3096 Invalid, 518 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 507 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-12-02 14:58:00,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63412 states. [2023-12-02 14:58:04,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63412 to 62692. [2023-12-02 14:58:04,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62692 states, 47104 states have (on average 1.430579144021739) internal successors, (67386), 48986 states have internal predecessors, (67386), 10500 states have call successors, (10500), 3423 states have call predecessors, (10500), 5087 states have return successors, (39750), 11065 states have call predecessors, (39750), 10452 states have call successors, (39750) [2023-12-02 14:58:05,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62692 states to 62692 states and 117636 transitions. [2023-12-02 14:58:05,473 INFO L78 Accepts]: Start accepts. Automaton has 62692 states and 117636 transitions. Word has length 158 [2023-12-02 14:58:05,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:58:05,474 INFO L495 AbstractCegarLoop]: Abstraction has 62692 states and 117636 transitions. [2023-12-02 14:58:05,474 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 19.6) internal successors, (98), 5 states have internal predecessors, (98), 3 states have call successors, (26), 3 states have call predecessors, (26), 3 states have return successors, (24), 3 states have call predecessors, (24), 3 states have call successors, (24) [2023-12-02 14:58:05,474 INFO L276 IsEmpty]: Start isEmpty. Operand 62692 states and 117636 transitions. [2023-12-02 14:58:05,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2023-12-02 14:58:05,482 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:58:05,483 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, 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 14:58:05,490 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2023-12-02 14:58:05,683 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:58:05,683 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:58:05,684 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:58:05,684 INFO L85 PathProgramCache]: Analyzing trace with hash -1434497955, now seen corresponding path program 1 times [2023-12-02 14:58:05,684 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:58:05,684 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2147042244] [2023-12-02 14:58:05,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:58:05,684 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:58:05,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:58:06,260 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 14 proven. 2 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2023-12-02 14:58:06,261 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:58:06,261 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2147042244] [2023-12-02 14:58:06,261 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2147042244] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:58:06,261 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [548069839] [2023-12-02 14:58:06,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:58:06,261 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:58:06,261 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:58:06,262 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:58:06,263 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2023-12-02 14:58:06,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:58:06,655 INFO L262 TraceCheckSpWp]: Trace formula consists of 2404 conjuncts, 8 conjunts are in the unsatisfiable core [2023-12-02 14:58:06,661 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:58:06,751 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 57 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-12-02 14:58:06,752 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:58:06,752 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [548069839] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:58:06,752 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:58:06,752 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [8] total 14 [2023-12-02 14:58:06,752 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1674616382] [2023-12-02 14:58:06,752 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:58:06,753 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 14:58:06,753 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:58:06,754 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 14:58:06,754 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2023-12-02 14:58:06,754 INFO L87 Difference]: Start difference. First operand 62692 states and 117636 transitions. Second operand has 8 states, 7 states have (on average 13.571428571428571) internal successors, (95), 7 states have internal predecessors, (95), 5 states have call successors, (27), 4 states have call predecessors, (27), 5 states have return successors, (25), 6 states have call predecessors, (25), 5 states have call successors, (25) [2023-12-02 14:58:14,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:58:14,229 INFO L93 Difference]: Finished difference Result 134880 states and 261833 transitions. [2023-12-02 14:58:14,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-12-02 14:58:14,230 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 13.571428571428571) internal successors, (95), 7 states have internal predecessors, (95), 5 states have call successors, (27), 4 states have call predecessors, (27), 5 states have return successors, (25), 6 states have call predecessors, (25), 5 states have call successors, (25) Word has length 151 [2023-12-02 14:58:14,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:58:14,891 INFO L225 Difference]: With dead ends: 134880 [2023-12-02 14:58:14,891 INFO L226 Difference]: Without dead ends: 72116 [2023-12-02 14:58:15,345 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 147 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 14:58:15,346 INFO L413 NwaCegarLoop]: 358 mSDtfsCounter, 1175 mSDsluCounter, 1133 mSDsCounter, 0 mSdLazyCounter, 2931 mSolverCounterSat, 473 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1263 SdHoareTripleChecker+Valid, 1491 SdHoareTripleChecker+Invalid, 3404 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 473 IncrementalHoareTripleChecker+Valid, 2931 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2023-12-02 14:58:15,347 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1263 Valid, 1491 Invalid, 3404 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [473 Valid, 2931 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2023-12-02 14:58:15,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72116 states. [2023-12-02 14:58:20,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72116 to 62798. [2023-12-02 14:58:20,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62798 states, 47176 states have (on average 1.4304731219264033) internal successors, (67484), 49092 states have internal predecessors, (67484), 10534 states have call successors, (10534), 3423 states have call predecessors, (10534), 5087 states have return successors, (40244), 11065 states have call predecessors, (40244), 10486 states have call successors, (40244) [2023-12-02 14:58:21,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62798 states to 62798 states and 118262 transitions. [2023-12-02 14:58:21,464 INFO L78 Accepts]: Start accepts. Automaton has 62798 states and 118262 transitions. Word has length 151 [2023-12-02 14:58:21,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:58:21,465 INFO L495 AbstractCegarLoop]: Abstraction has 62798 states and 118262 transitions. [2023-12-02 14:58:21,465 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 13.571428571428571) internal successors, (95), 7 states have internal predecessors, (95), 5 states have call successors, (27), 4 states have call predecessors, (27), 5 states have return successors, (25), 6 states have call predecessors, (25), 5 states have call successors, (25) [2023-12-02 14:58:21,465 INFO L276 IsEmpty]: Start isEmpty. Operand 62798 states and 118262 transitions. [2023-12-02 14:58:21,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2023-12-02 14:58:21,473 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:58:21,473 INFO L195 NwaCegarLoop]: trace histogram [7, 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, 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] [2023-12-02 14:58:21,481 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2023-12-02 14:58:21,674 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2023-12-02 14:58:21,674 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:58:21,674 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:58:21,674 INFO L85 PathProgramCache]: Analyzing trace with hash 1212547740, now seen corresponding path program 1 times [2023-12-02 14:58:21,675 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:58:21,675 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [597400356] [2023-12-02 14:58:21,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:58:21,675 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:58:21,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:58:22,730 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 11 proven. 19 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2023-12-02 14:58:22,730 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:58:22,730 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [597400356] [2023-12-02 14:58:22,730 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [597400356] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:58:22,730 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1305866840] [2023-12-02 14:58:22,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:58:22,730 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:58:22,731 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:58:22,732 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:58:22,733 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2023-12-02 14:58:23,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:58:23,186 INFO L262 TraceCheckSpWp]: Trace formula consists of 2462 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 14:58:23,191 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:58:23,364 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 44 proven. 3 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2023-12-02 14:58:23,364 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:58:23,725 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 30 proven. 1 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2023-12-02 14:58:23,725 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1305866840] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:58:23,725 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1072361555] [2023-12-02 14:58:23,756 INFO L159 IcfgInterpreter]: Started Sifa with 108 locations of interest [2023-12-02 14:58:23,756 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:58:23,761 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:58:23,768 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:58:23,768 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:58:57,373 INFO L197 IcfgInterpreter]: Interpreting procedure timeShift with input of size 15 for LOIs [2023-12-02 14:59:02,022 INFO L197 IcfgInterpreter]: Interpreting procedure __automaton_fail with input of size 9 for LOIs [2023-12-02 14:59:02,024 INFO L197 IcfgInterpreter]: Interpreting procedure timeShift__wrappee__twothirdsfull with input of size 249 for LOIs [2023-12-02 14:59:08,835 INFO L197 IcfgInterpreter]: Interpreting procedure stopRequestedInDirection with input of size 36 for LOIs [2023-12-02 14:59:09,355 INFO L197 IcfgInterpreter]: Interpreting procedure buttonForFloorIsPressed with input of size 8 for LOIs [2023-12-02 14:59:09,375 INFO L197 IcfgInterpreter]: Interpreting procedure initTopDown with input of size 601 for LOIs [2023-12-02 14:59:19,802 INFO L197 IcfgInterpreter]: Interpreting procedure initFloors with input of size 575 for LOIs [2023-12-02 14:59:20,608 INFO L197 IcfgInterpreter]: Interpreting procedure stopRequestedInDirection__wrappee__empty with input of size 97 for LOIs [2023-12-02 14:59:21,496 INFO L197 IcfgInterpreter]: Interpreting procedure isFloorCalling with input of size 97 for LOIs [2023-12-02 14:59:21,547 INFO L197 IcfgInterpreter]: Interpreting procedure getCurrentFloorID with input of size 275 for LOIs [2023-12-02 14:59:22,844 INFO L197 IcfgInterpreter]: Interpreting procedure continueInDirection with input of size 45 for LOIs [2023-12-02 14:59:22,870 INFO L197 IcfgInterpreter]: Interpreting procedure getCurrentHeading with input of size 107 for LOIs [2023-12-02 14:59:22,972 INFO L197 IcfgInterpreter]: Interpreting procedure bobCall with input of size 575 for LOIs [2023-12-02 14:59:38,514 INFO L197 IcfgInterpreter]: Interpreting procedure initPersonOnFloor with input of size 579 for LOIs [2023-12-02 14:59:39,687 INFO L197 IcfgInterpreter]: Interpreting procedure getOrigin with input of size 507 for LOIs [2023-12-02 14:59:40,294 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:59:51,301 WARN L293 SmtUtils]: Spent 6.11s on a formula simplification that was a NOOP. DAG size: 601 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 14:59:57,646 WARN L293 SmtUtils]: Spent 6.00s on a formula simplification that was a NOOP. DAG size: 601 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 15:00:03,429 WARN L293 SmtUtils]: Spent 5.45s on a formula simplification that was a NOOP. DAG size: 575 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 15:00:21,979 WARN L293 SmtUtils]: Spent 5.09s on a formula simplification that was a NOOP. DAG size: 577 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 15:00:37,940 WARN L293 SmtUtils]: Spent 5.42s on a formula simplification that was a NOOP. DAG size: 583 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 15:01:37,082 WARN L293 SmtUtils]: Spent 7.68s on a formula simplification. DAG size of input: 514 DAG size of output: 438 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 15:01:40,174 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1122581#(and (= ~currentHeading~0 0) (= ~expectedDirection~0 1) (= ~blocked~0 0))' at error location [2023-12-02 15:01:40,174 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 15:01:40,175 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 15:01:40,175 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 9, 9] total 29 [2023-12-02 15:01:40,175 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [454953329] [2023-12-02 15:01:40,175 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 15:01:40,176 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2023-12-02 15:01:40,176 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:01:40,177 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2023-12-02 15:01:40,182 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=922, Invalid=13358, Unknown=0, NotChecked=0, Total=14280 [2023-12-02 15:01:40,183 INFO L87 Difference]: Start difference. First operand 62798 states and 118262 transitions. Second operand has 29 states, 21 states have (on average 7.857142857142857) internal successors, (165), 25 states have internal predecessors, (165), 16 states have call successors, (58), 7 states have call predecessors, (58), 15 states have return successors, (59), 19 states have call predecessors, (59), 16 states have call successors, (59) [2023-12-02 15:02:04,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:02:04,382 INFO L93 Difference]: Finished difference Result 174276 states and 387983 transitions. [2023-12-02 15:02:04,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2023-12-02 15:02:04,383 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 21 states have (on average 7.857142857142857) internal successors, (165), 25 states have internal predecessors, (165), 16 states have call successors, (58), 7 states have call predecessors, (58), 15 states have return successors, (59), 19 states have call predecessors, (59), 16 states have call successors, (59) Word has length 169 [2023-12-02 15:02:04,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:02:05,433 INFO L225 Difference]: With dead ends: 174276 [2023-12-02 15:02:05,433 INFO L226 Difference]: Without dead ends: 114235 [2023-12-02 15:02:06,824 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 606 GetRequests, 429 SyntacticMatches, 3 SemanticMatches, 174 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11502 ImplicationChecksByTransitivity, 122.8s TimeCoverageRelationStatistics Valid=2152, Invalid=28648, Unknown=0, NotChecked=0, Total=30800 [2023-12-02 15:02:06,825 INFO L413 NwaCegarLoop]: 639 mSDtfsCounter, 10298 mSDsluCounter, 6736 mSDsCounter, 0 mSdLazyCounter, 17077 mSolverCounterSat, 5686 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10298 SdHoareTripleChecker+Valid, 7375 SdHoareTripleChecker+Invalid, 22763 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 5686 IncrementalHoareTripleChecker+Valid, 17077 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.4s IncrementalHoareTripleChecker+Time [2023-12-02 15:02:06,825 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10298 Valid, 7375 Invalid, 22763 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [5686 Valid, 17077 Invalid, 0 Unknown, 0 Unchecked, 10.4s Time] [2023-12-02 15:02:06,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114235 states. [2023-12-02 15:02:16,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114235 to 100822. [2023-12-02 15:02:16,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100822 states, 72066 states have (on average 1.400341353759054) internal successors, (100917), 76176 states have internal predecessors, (100917), 19937 states have call successors, (19937), 6627 states have call predecessors, (19937), 8818 states have return successors, (59093), 19755 states have call predecessors, (59093), 19882 states have call successors, (59093) [2023-12-02 15:02:17,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100822 states to 100822 states and 179947 transitions. [2023-12-02 15:02:17,647 INFO L78 Accepts]: Start accepts. Automaton has 100822 states and 179947 transitions. Word has length 169 [2023-12-02 15:02:17,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:02:17,648 INFO L495 AbstractCegarLoop]: Abstraction has 100822 states and 179947 transitions. [2023-12-02 15:02:17,648 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 21 states have (on average 7.857142857142857) internal successors, (165), 25 states have internal predecessors, (165), 16 states have call successors, (58), 7 states have call predecessors, (58), 15 states have return successors, (59), 19 states have call predecessors, (59), 16 states have call successors, (59) [2023-12-02 15:02:17,648 INFO L276 IsEmpty]: Start isEmpty. Operand 100822 states and 179947 transitions. [2023-12-02 15:02:17,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2023-12-02 15:02:17,662 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:02:17,663 INFO L195 NwaCegarLoop]: trace histogram [7, 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, 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, 1] [2023-12-02 15:02:17,671 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2023-12-02 15:02:17,863 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2023-12-02 15:02:17,864 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:02:17,864 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:02:17,864 INFO L85 PathProgramCache]: Analyzing trace with hash -1554826025, now seen corresponding path program 1 times [2023-12-02 15:02:17,864 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:02:17,864 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1781916638] [2023-12-02 15:02:17,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:02:17,865 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:02:17,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:02:18,489 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 5 proven. 22 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2023-12-02 15:02:18,489 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:02:18,489 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1781916638] [2023-12-02 15:02:18,489 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1781916638] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:02:18,489 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1061790363] [2023-12-02 15:02:18,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:02:18,489 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:02:18,490 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:02:18,490 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:02:18,491 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2023-12-02 15:02:18,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:02:18,928 INFO L262 TraceCheckSpWp]: Trace formula consists of 2501 conjuncts, 21 conjunts are in the unsatisfiable core [2023-12-02 15:02:18,933 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:02:19,025 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 41 proven. 2 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2023-12-02 15:02:19,025 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 15:02:19,298 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 27 proven. 1 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2023-12-02 15:02:19,298 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1061790363] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 15:02:19,298 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1258465958] [2023-12-02 15:02:19,304 INFO L159 IcfgInterpreter]: Started Sifa with 122 locations of interest [2023-12-02 15:02:19,304 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 15:02:19,305 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 15:02:19,305 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 15:02:19,305 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 15:02:53,529 INFO L197 IcfgInterpreter]: Interpreting procedure timeShift with input of size 19 for LOIs [2023-12-02 15:02:57,391 INFO L197 IcfgInterpreter]: Interpreting procedure __automaton_fail with input of size 86 for LOIs [2023-12-02 15:02:57,417 INFO L197 IcfgInterpreter]: Interpreting procedure timeShift__wrappee__twothirdsfull with input of size 232 for LOIs [2023-12-02 15:02:59,055 INFO L197 IcfgInterpreter]: Interpreting procedure stopRequestedInDirection with input of size 36 for LOIs [2023-12-02 15:02:59,499 INFO L197 IcfgInterpreter]: Interpreting procedure buttonForFloorIsPressed with input of size 41 for LOIs [2023-12-02 15:02:59,520 INFO L197 IcfgInterpreter]: Interpreting procedure initTopDown with input of size 601 for LOIs [2023-12-02 15:03:08,585 INFO L197 IcfgInterpreter]: Interpreting procedure initFloors with input of size 575 for LOIs [2023-12-02 15:03:09,284 INFO L197 IcfgInterpreter]: Interpreting procedure stopRequestedInDirection__wrappee__empty with input of size 97 for LOIs [2023-12-02 15:03:11,043 INFO L197 IcfgInterpreter]: Interpreting procedure isTopFloor with input of size 95 for LOIs [2023-12-02 15:03:11,081 INFO L197 IcfgInterpreter]: Interpreting procedure isFloorCalling with input of size 109 for LOIs [2023-12-02 15:03:11,189 INFO L197 IcfgInterpreter]: Interpreting procedure getCurrentFloorID with input of size 117 for LOIs [2023-12-02 15:03:11,294 INFO L197 IcfgInterpreter]: Interpreting procedure continueInDirection with input of size 45 for LOIs [2023-12-02 15:03:11,323 INFO L197 IcfgInterpreter]: Interpreting procedure getCurrentHeading with input of size 128 for LOIs [2023-12-02 15:03:11,529 INFO L197 IcfgInterpreter]: Interpreting procedure bobCall with input of size 575 for LOIs [2023-12-02 15:03:25,909 INFO L197 IcfgInterpreter]: Interpreting procedure initPersonOnFloor with input of size 579 for LOIs [2023-12-02 15:03:28,832 INFO L197 IcfgInterpreter]: Interpreting procedure getOrigin with input of size 507 for LOIs [2023-12-02 15:03:29,377 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 15:03:38,944 WARN L293 SmtUtils]: Spent 5.23s on a formula simplification that was a NOOP. DAG size: 601 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 15:03:44,487 WARN L293 SmtUtils]: Spent 5.31s on a formula simplification that was a NOOP. DAG size: 601 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 15:05:07,482 WARN L293 SmtUtils]: Spent 9.06s on a formula simplification. DAG size of input: 526 DAG size of output: 520 (called from [L 391] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2023-12-02 15:05:15,926 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1470411#(and (<= 1 |#StackHeapBarrier|) (= ~head~0.offset 0) (= ~expectedDirection~0 1) (exists ((|v_timeShift_~tmp~25#1_BEFORE_CALL_22| Int) (|v_timeShift_areDoorsOpen_#res#1_BEFORE_CALL_22| Int)) (and (<= |v_timeShift_~tmp~25#1_BEFORE_CALL_22| 2147483647) (or (and (exists ((|v_old(~floorButtons_2~0)_AFTER_CALL_70| Int)) (and (<= |v_old(~floorButtons_2~0)_AFTER_CALL_70| 2147483647) (not (= |v_old(~floorButtons_2~0)_AFTER_CALL_70| 0)) (<= 0 (+ |v_old(~floorButtons_2~0)_AFTER_CALL_70| 2147483648)))) (= ~currentHeading~0 0) (not (= |v_timeShift_~tmp~25#1_BEFORE_CALL_22| 0)) (exists ((|v_timeShift__wrappee__twothirdsfull_stopRequestedAtCurrentFloor_~tmp___0~9#1_67| Int)) (and (not (= |v_timeShift__wrappee__twothirdsfull_stopRequestedAtCurrentFloor_~tmp___0~9#1_67| 1)) (<= |v_timeShift__wrappee__twothirdsfull_stopRequestedAtCurrentFloor_~tmp___0~9#1_67| 2147483647) (<= 0 (+ |v_timeShift__wrappee__twothirdsfull_stopRequestedAtCurrentFloor_~tmp___0~9#1_67| 2147483648)))) (not (= ~doorState~0 1)) (exists ((|v_timeShift__wrappee__twothirdsfull_~tmp___8~3#1_BEFORE_RETURN_11| Int)) (and (not (= |v_timeShift__wrappee__twothirdsfull_~tmp___8~3#1_BEFORE_RETURN_11| 0)) (<= 0 (+ |v_timeShift__wrappee__twothirdsfull_~tmp___8~3#1_BEFORE_RETURN_11| 2147483648)) (<= |v_timeShift__wrappee__twothirdsfull_~tmp___8~3#1_BEFORE_RETURN_11| 2147483647))) (= |v_timeShift_areDoorsOpen_#res#1_BEFORE_CALL_22| |v_timeShift_~tmp~25#1_BEFORE_CALL_22|) (not (= (+ ~currentFloorID~0 1) 0))) (and (= ~currentHeading~0 0) (exists ((|v_old(~floorButtons_2~0)_AFTER_CALL_71| Int)) (and (<= 0 (+ |v_old(~floorButtons_2~0)_AFTER_CALL_71| 2147483648)) (not (= |v_old(~floorButtons_2~0)_AFTER_CALL_71| 0)) (<= |v_old(~floorButtons_2~0)_AFTER_CALL_71| 2147483647))) (not (= |v_timeShift_~tmp~25#1_BEFORE_CALL_22| 0)) (exists ((|v_timeShift__wrappee__twothirdsfull_stopRequestedAtCurrentFloor_~tmp___0~9#1_67| Int)) (and (not (= |v_timeShift__wrappee__twothirdsfull_stopRequestedAtCurrentFloor_~tmp___0~9#1_67| 1)) (<= |v_timeShift__wrappee__twothirdsfull_stopRequestedAtCurrentFloor_~tmp___0~9#1_67| 2147483647) (<= 0 (+ |v_timeShift__wrappee__twothirdsfull_stopRequestedAtCurrentFloor_~tmp___0~9#1_67| 2147483648)))) (not (= ~doorState~0 1)) (= |v_timeShift_areDoorsOpen_#res#1_BEFORE_CALL_22| |v_timeShift_~tmp~25#1_BEFORE_CALL_22|) (not (= (+ ~currentFloorID~0 1) 0)) (exists ((|v_timeShift__wrappee__twothirdsfull_~tmp___8~3#1_BEFORE_RETURN_12| Int)) (and (<= 0 (+ |v_timeShift__wrappee__twothirdsfull_~tmp___8~3#1_BEFORE_RETURN_12| 2147483648)) (not (= |v_timeShift__wrappee__twothirdsfull_~tmp___8~3#1_BEFORE_RETURN_12| 0)) (<= |v_timeShift__wrappee__twothirdsfull_~tmp___8~3#1_BEFORE_RETURN_12| 2147483647))))) (<= 0 (+ |v_timeShift_areDoorsOpen_#res#1_BEFORE_CALL_22| 2147483648)))) (= ~head~0.base 0) (= ~blocked~0 0) (= ~maximumWeight~0 100) (= ~cleanupTimeShifts~0 12))' at error location [2023-12-02 15:05:15,926 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 15:05:15,926 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 15:05:15,927 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 10, 10] total 20 [2023-12-02 15:05:15,927 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1210524829] [2023-12-02 15:05:15,927 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 15:05:15,928 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-12-02 15:05:15,928 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:05:15,929 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-12-02 15:05:15,933 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=862, Invalid=13658, Unknown=0, NotChecked=0, Total=14520 [2023-12-02 15:05:15,934 INFO L87 Difference]: Start difference. First operand 100822 states and 179947 transitions. Second operand has 20 states, 18 states have (on average 9.222222222222221) internal successors, (166), 18 states have internal predecessors, (166), 9 states have call successors, (56), 7 states have call predecessors, (56), 8 states have return successors, (54), 12 states have call predecessors, (54), 9 states have call successors, (54) [2023-12-02 15:05:43,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:05:43,360 INFO L93 Difference]: Finished difference Result 270961 states and 547781 transitions. [2023-12-02 15:05:43,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2023-12-02 15:05:43,361 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 18 states have (on average 9.222222222222221) internal successors, (166), 18 states have internal predecessors, (166), 9 states have call successors, (56), 7 states have call predecessors, (56), 8 states have return successors, (54), 12 states have call predecessors, (54), 9 states have call successors, (54) Word has length 186 [2023-12-02 15:05:43,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:05:44,831 INFO L225 Difference]: With dead ends: 270961 [2023-12-02 15:05:44,831 INFO L226 Difference]: Without dead ends: 173371 [2023-12-02 15:05:45,885 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 640 GetRequests, 470 SyntacticMatches, 2 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10610 ImplicationChecksByTransitivity, 109.0s TimeCoverageRelationStatistics Valid=1453, Invalid=27277, Unknown=0, NotChecked=0, Total=28730 [2023-12-02 15:05:45,885 INFO L413 NwaCegarLoop]: 923 mSDtfsCounter, 5292 mSDsluCounter, 5774 mSDsCounter, 0 mSdLazyCounter, 10978 mSolverCounterSat, 3274 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5307 SdHoareTripleChecker+Valid, 6697 SdHoareTripleChecker+Invalid, 14252 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 3274 IncrementalHoareTripleChecker+Valid, 10978 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.1s IncrementalHoareTripleChecker+Time [2023-12-02 15:05:45,886 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5307 Valid, 6697 Invalid, 14252 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [3274 Valid, 10978 Invalid, 0 Unknown, 0 Unchecked, 6.1s Time] [2023-12-02 15:05:46,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173371 states. [2023-12-02 15:06:02,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173371 to 146098. [2023-12-02 15:06:02,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146098 states, 100162 states have (on average 1.3927737065953156) internal successors, (139503), 107949 states have internal predecessors, (139503), 34358 states have call successors, (34358), 8918 states have call predecessors, (34358), 11577 states have return successors, (89466), 32901 states have call predecessors, (89466), 34288 states have call successors, (89466) [2023-12-02 15:06:03,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146098 states to 146098 states and 263327 transitions. [2023-12-02 15:06:03,774 INFO L78 Accepts]: Start accepts. Automaton has 146098 states and 263327 transitions. Word has length 186 [2023-12-02 15:06:03,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:06:03,774 INFO L495 AbstractCegarLoop]: Abstraction has 146098 states and 263327 transitions. [2023-12-02 15:06:03,774 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 18 states have (on average 9.222222222222221) internal successors, (166), 18 states have internal predecessors, (166), 9 states have call successors, (56), 7 states have call predecessors, (56), 8 states have return successors, (54), 12 states have call predecessors, (54), 9 states have call successors, (54) [2023-12-02 15:06:03,775 INFO L276 IsEmpty]: Start isEmpty. Operand 146098 states and 263327 transitions. [2023-12-02 15:06:03,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2023-12-02 15:06:03,781 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:06:03,781 INFO L195 NwaCegarLoop]: trace histogram [7, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 15:06:03,791 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2023-12-02 15:06:03,981 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2b10846b-4713-4b82-9d51-656592dd9277/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2023-12-02 15:06:03,982 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:06:03,982 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:06:03,982 INFO L85 PathProgramCache]: Analyzing trace with hash -1057383568, now seen corresponding path program 1 times [2023-12-02 15:06:03,982 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:06:03,982 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1123185635] [2023-12-02 15:06:03,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:06:03,982 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:06:04,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:06:04,421 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 89 trivial. 0 not checked. [2023-12-02 15:06:04,421 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:06:04,421 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1123185635] [2023-12-02 15:06:04,421 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1123185635] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:06:04,421 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 15:06:04,422 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-12-02 15:06:04,422 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [720725659] [2023-12-02 15:06:04,422 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:06:04,422 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 15:06:04,423 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:06:04,423 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 15:06:04,423 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-12-02 15:06:04,423 INFO L87 Difference]: Start difference. First operand 146098 states and 263327 transitions. Second operand has 7 states, 7 states have (on average 13.857142857142858) internal successors, (97), 5 states have internal predecessors, (97), 2 states have call successors, (29), 2 states have call predecessors, (29), 4 states have return successors, (28), 4 states have call predecessors, (28), 2 states have call successors, (28) [2023-12-02 15:06:20,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:06:20,519 INFO L93 Difference]: Finished difference Result 275854 states and 501148 transitions. [2023-12-02 15:06:20,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 15:06:20,520 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 13.857142857142858) internal successors, (97), 5 states have internal predecessors, (97), 2 states have call successors, (29), 2 states have call predecessors, (29), 4 states have return successors, (28), 4 states have call predecessors, (28), 2 states have call successors, (28) Word has length 190 [2023-12-02 15:06:20,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:06:21,922 INFO L225 Difference]: With dead ends: 275854 [2023-12-02 15:06:21,922 INFO L226 Difference]: Without dead ends: 149993 [2023-12-02 15:06:22,739 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 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 15:06:22,739 INFO L413 NwaCegarLoop]: 591 mSDtfsCounter, 6 mSDsluCounter, 2917 mSDsCounter, 0 mSdLazyCounter, 267 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 3508 SdHoareTripleChecker+Invalid, 269 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 267 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 15:06:22,740 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 3508 Invalid, 269 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 267 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 15:06:22,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149993 states. [2023-12-02 15:06:37,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149993 to 149052. [2023-12-02 15:06:37,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149052 states, 102280 states have (on average 1.3846402033633163) internal successors, (141621), 110153 states have internal predecessors, (141621), 34358 states have call successors, (34358), 8918 states have call predecessors, (34358), 12413 states have return successors, (91884), 33651 states have call predecessors, (91884), 34288 states have call successors, (91884) [2023-12-02 15:06:39,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149052 states to 149052 states and 267863 transitions. [2023-12-02 15:06:39,055 INFO L78 Accepts]: Start accepts. Automaton has 149052 states and 267863 transitions. Word has length 190 [2023-12-02 15:06:39,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:06:39,055 INFO L495 AbstractCegarLoop]: Abstraction has 149052 states and 267863 transitions. [2023-12-02 15:06:39,055 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 13.857142857142858) internal successors, (97), 5 states have internal predecessors, (97), 2 states have call successors, (29), 2 states have call predecessors, (29), 4 states have return successors, (28), 4 states have call predecessors, (28), 2 states have call successors, (28) [2023-12-02 15:06:39,055 INFO L276 IsEmpty]: Start isEmpty. Operand 149052 states and 267863 transitions. [2023-12-02 15:06:39,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2023-12-02 15:06:39,065 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:06:39,065 INFO L195 NwaCegarLoop]: trace histogram [7, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 15:06:39,065 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2023-12-02 15:06:39,065 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:06:39,066 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:06:39,066 INFO L85 PathProgramCache]: Analyzing trace with hash 923893756, now seen corresponding path program 2 times [2023-12-02 15:06:39,066 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:06:39,066 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2027459691] [2023-12-02 15:06:39,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:06:39,066 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:06:39,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:06:39,304 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 89 trivial. 0 not checked. [2023-12-02 15:06:39,304 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:06:39,304 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2027459691] [2023-12-02 15:06:39,304 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2027459691] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:06:39,305 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 15:06:39,305 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-12-02 15:06:39,305 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1042717254] [2023-12-02 15:06:39,305 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:06:39,305 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 15:06:39,305 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:06:39,306 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 15:06:39,306 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-12-02 15:06:39,306 INFO L87 Difference]: Start difference. First operand 149052 states and 267863 transitions. Second operand has 7 states, 7 states have (on average 13.857142857142858) internal successors, (97), 5 states have internal predecessors, (97), 2 states have call successors, (29), 2 states have call predecessors, (29), 4 states have return successors, (28), 4 states have call predecessors, (28), 2 states have call successors, (28) [2023-12-02 15:06:54,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:06:54,703 INFO L93 Difference]: Finished difference Result 280780 states and 508887 transitions. [2023-12-02 15:06:54,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-12-02 15:06:54,704 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 13.857142857142858) internal successors, (97), 5 states have internal predecessors, (97), 2 states have call successors, (29), 2 states have call predecessors, (29), 4 states have return successors, (28), 4 states have call predecessors, (28), 2 states have call successors, (28) Word has length 190 [2023-12-02 15:06:54,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:06:56,188 INFO L225 Difference]: With dead ends: 280780 [2023-12-02 15:06:56,188 INFO L226 Difference]: Without dead ends: 152221 [2023-12-02 15:06:57,054 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 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 15:06:57,055 INFO L413 NwaCegarLoop]: 591 mSDtfsCounter, 6 mSDsluCounter, 2917 mSDsCounter, 0 mSdLazyCounter, 267 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 3508 SdHoareTripleChecker+Invalid, 269 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 267 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 15:06:57,055 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 3508 Invalid, 269 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 267 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 15:06:57,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152221 states. [2023-12-02 15:07:11,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152221 to 149210. [2023-12-02 15:07:11,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149210 states, 102444 states have (on average 1.3840244426223107) internal successors, (141785), 110141 states have internal predecessors, (141785), 34358 states have call successors, (34358), 8918 states have call predecessors, (34358), 12407 states have return successors, (91872), 33821 states have call predecessors, (91872), 34288 states have call successors, (91872) [2023-12-02 15:07:12,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149210 states to 149210 states and 268015 transitions. [2023-12-02 15:07:12,982 INFO L78 Accepts]: Start accepts. Automaton has 149210 states and 268015 transitions. Word has length 190 [2023-12-02 15:07:12,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:07:12,983 INFO L495 AbstractCegarLoop]: Abstraction has 149210 states and 268015 transitions. [2023-12-02 15:07:12,983 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 13.857142857142858) internal successors, (97), 5 states have internal predecessors, (97), 2 states have call successors, (29), 2 states have call predecessors, (29), 4 states have return successors, (28), 4 states have call predecessors, (28), 2 states have call successors, (28) [2023-12-02 15:07:12,983 INFO L276 IsEmpty]: Start isEmpty. Operand 149210 states and 268015 transitions. [2023-12-02 15:07:12,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2023-12-02 15:07:12,990 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:07:12,990 INFO L195 NwaCegarLoop]: trace histogram [7, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 15:07:12,990 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2023-12-02 15:07:12,990 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:07:12,991 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:07:12,991 INFO L85 PathProgramCache]: Analyzing trace with hash 1986308128, now seen corresponding path program 1 times [2023-12-02 15:07:12,991 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:07:12,991 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1246368228] [2023-12-02 15:07:12,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:07:12,991 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:07:13,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:07:13,484 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2023-12-02 15:07:13,485 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:07:13,485 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1246368228] [2023-12-02 15:07:13,485 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1246368228] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:07:13,485 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 15:07:13,485 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-12-02 15:07:13,485 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [874292663] [2023-12-02 15:07:13,485 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:07:13,486 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 15:07:13,486 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:07:13,486 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 15:07:13,486 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-12-02 15:07:13,487 INFO L87 Difference]: Start difference. First operand 149210 states and 268015 transitions. Second operand has 7 states, 7 states have (on average 13.857142857142858) internal successors, (97), 5 states have internal predecessors, (97), 2 states have call successors, (29), 2 states have call predecessors, (29), 4 states have return successors, (28), 4 states have call predecessors, (28), 2 states have call successors, (28)