./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 30e01a73 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_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/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_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire --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 0.2.3-dev-30e01a7 [2023-11-23 21:16:46,055 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 21:16:46,173 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-23 21:16:46,185 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 21:16:46,186 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 21:16:46,225 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 21:16:46,226 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 21:16:46,226 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 21:16:46,227 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 21:16:46,234 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 21:16:46,235 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 21:16:46,236 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 21:16:46,236 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 21:16:46,238 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 21:16:46,239 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 21:16:46,239 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 21:16:46,240 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 21:16:46,240 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 21:16:46,240 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 21:16:46,249 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 21:16:46,249 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 21:16:46,250 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 21:16:46,251 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 21:16:46,252 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 21:16:46,252 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 21:16:46,253 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 21:16:46,253 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 21:16:46,254 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 21:16:46,254 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 21:16:46,254 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 21:16:46,256 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 21:16:46,256 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 21:16:46,256 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 21:16:46,257 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 21:16:46,257 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 21:16:46,257 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 21:16:46,258 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 21:16:46,258 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:16:46,258 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 21:16:46,259 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 21:16:46,259 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 21:16:46,259 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 21:16:46,260 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 21:16:46,260 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 21:16:46,260 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 21:16:46,261 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 21:16:46,261 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 21:16:46,261 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_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4fa4154afcc1fa94c570756c4d3485a9415aeef22801b46450f13cd61ecf8230 [2023-11-23 21:16:46,589 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 21:16:46,618 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 21:16:46,621 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 21:16:46,623 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 21:16:46,624 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 21:16:46,626 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/product-lines/elevator_spec3_product30.cil.c [2023-11-23 21:16:49,639 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 21:16:49,975 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 21:16:49,975 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/sv-benchmarks/c/product-lines/elevator_spec3_product30.cil.c [2023-11-23 21:16:50,008 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/data/849fcf80f/7dd8dfda78bf44acbc2fcc612c68b2a5/FLAGe1e63906d [2023-11-23 21:16:50,021 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/data/849fcf80f/7dd8dfda78bf44acbc2fcc612c68b2a5 [2023-11-23 21:16:50,023 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 21:16:50,025 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 21:16:50,026 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 21:16:50,026 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 21:16:50,037 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 21:16:50,038 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:16:50" (1/1) ... [2023-11-23 21:16:50,039 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@66ee218 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:16:50, skipping insertion in model container [2023-11-23 21:16:50,039 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:16:50" (1/1) ... [2023-11-23 21:16:50,137 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 21:16:50,537 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_539554e1-8511-4156-b9c8-8cb033934866/sv-benchmarks/c/product-lines/elevator_spec3_product30.cil.c[14523,14536] [2023-11-23 21:16:50,822 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:16:50,854 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 21:16:50,867 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Person.i","") [48] [2023-11-23 21:16:50,869 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Test.i","") [169] [2023-11-23 21:16:50,870 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"UnitTests.i","") [528] [2023-11-23 21:16:50,870 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Specification3_spec.i","") [623] [2023-11-23 21:16:50,871 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"scenario.i","") [813] [2023-11-23 21:16:50,871 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"wsllib_check.i","") [828] [2023-11-23 21:16:50,872 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Elevator.i","") [837] [2023-11-23 21:16:50,872 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"libacc.i","") [2419] [2023-11-23 21:16:50,872 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"featureselect.i","") [2785] [2023-11-23 21:16:50,873 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Floor.i","") [2820] [2023-11-23 21:16:50,915 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_539554e1-8511-4156-b9c8-8cb033934866/sv-benchmarks/c/product-lines/elevator_spec3_product30.cil.c[14523,14536] [2023-11-23 21:16:51,099 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:16:51,136 INFO L206 MainTranslator]: Completed translation [2023-11-23 21:16:51,137 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:16:51 WrapperNode [2023-11-23 21:16:51,137 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 21:16:51,138 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 21:16:51,138 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 21:16:51,138 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 21:16:51,144 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:16:51" (1/1) ... [2023-11-23 21:16:51,176 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:16:51" (1/1) ... [2023-11-23 21:16:51,242 INFO L138 Inliner]: procedures = 93, calls = 353, calls flagged for inlining = 28, calls inlined = 24, statements flattened = 948 [2023-11-23 21:16:51,243 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 21:16:51,244 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 21:16:51,244 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 21:16:51,244 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 21:16:51,255 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:16:51" (1/1) ... [2023-11-23 21:16:51,255 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:16:51" (1/1) ... [2023-11-23 21:16:51,264 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:16:51" (1/1) ... [2023-11-23 21:16:51,264 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:16:51" (1/1) ... [2023-11-23 21:16:51,296 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:16:51" (1/1) ... [2023-11-23 21:16:51,314 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:16:51" (1/1) ... [2023-11-23 21:16:51,320 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:16:51" (1/1) ... [2023-11-23 21:16:51,328 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:16:51" (1/1) ... [2023-11-23 21:16:51,338 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 21:16:51,339 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 21:16:51,339 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 21:16:51,339 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 21:16:51,340 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:16:51" (1/1) ... [2023-11-23 21:16:51,346 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:16:51,376 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:16:51,410 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 21:16:51,450 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 21:16:51,487 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 21:16:51,488 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentHeading [2023-11-23 21:16:51,488 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentHeading [2023-11-23 21:16:51,488 INFO L130 BoogieDeclarations]: Found specification of procedure getWeight [2023-11-23 21:16:51,489 INFO L138 BoogieDeclarations]: Found implementation of procedure getWeight [2023-11-23 21:16:51,490 INFO L130 BoogieDeclarations]: Found specification of procedure enterElevator [2023-11-23 21:16:51,490 INFO L138 BoogieDeclarations]: Found implementation of procedure enterElevator [2023-11-23 21:16:51,490 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection [2023-11-23 21:16:51,491 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection [2023-11-23 21:16:51,491 INFO L130 BoogieDeclarations]: Found specification of procedure bobCall [2023-11-23 21:16:51,491 INFO L138 BoogieDeclarations]: Found implementation of procedure bobCall [2023-11-23 21:16:51,492 INFO L130 BoogieDeclarations]: Found specification of procedure getReverseHeading [2023-11-23 21:16:51,493 INFO L138 BoogieDeclarations]: Found implementation of procedure getReverseHeading [2023-11-23 21:16:51,493 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection__wrappee__empty [2023-11-23 21:16:51,494 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection__wrappee__empty [2023-11-23 21:16:51,494 INFO L130 BoogieDeclarations]: Found specification of procedure cleanup [2023-11-23 21:16:51,496 INFO L138 BoogieDeclarations]: Found implementation of procedure cleanup [2023-11-23 21:16:51,497 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift [2023-11-23 21:16:51,497 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift [2023-11-23 21:16:51,497 INFO L130 BoogieDeclarations]: Found specification of procedure __automaton_fail [2023-11-23 21:16:51,497 INFO L138 BoogieDeclarations]: Found implementation of procedure __automaton_fail [2023-11-23 21:16:51,498 INFO L130 BoogieDeclarations]: Found specification of procedure isTopFloor [2023-11-23 21:16:51,498 INFO L138 BoogieDeclarations]: Found implementation of procedure isTopFloor [2023-11-23 21:16:51,498 INFO L130 BoogieDeclarations]: Found specification of procedure getDestination [2023-11-23 21:16:51,498 INFO L138 BoogieDeclarations]: Found implementation of procedure getDestination [2023-11-23 21:16:51,498 INFO L130 BoogieDeclarations]: Found specification of procedure isBlocked [2023-11-23 21:16:51,498 INFO L138 BoogieDeclarations]: Found implementation of procedure isBlocked [2023-11-23 21:16:51,499 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentFloorID [2023-11-23 21:16:51,499 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentFloorID [2023-11-23 21:16:51,499 INFO L130 BoogieDeclarations]: Found specification of procedure initTopDown [2023-11-23 21:16:51,499 INFO L138 BoogieDeclarations]: Found implementation of procedure initTopDown [2023-11-23 21:16:51,499 INFO L130 BoogieDeclarations]: Found specification of procedure resetCallOnFloor [2023-11-23 21:16:51,500 INFO L138 BoogieDeclarations]: Found implementation of procedure resetCallOnFloor [2023-11-23 21:16:51,500 INFO L130 BoogieDeclarations]: Found specification of procedure initFloors [2023-11-23 21:16:51,500 INFO L138 BoogieDeclarations]: Found implementation of procedure initFloors [2023-11-23 21:16:51,500 INFO L130 BoogieDeclarations]: Found specification of procedure initPersonOnFloor [2023-11-23 21:16:51,500 INFO L138 BoogieDeclarations]: Found implementation of procedure initPersonOnFloor [2023-11-23 21:16:51,501 INFO L130 BoogieDeclarations]: Found specification of procedure removePersonFromFloor [2023-11-23 21:16:51,501 INFO L138 BoogieDeclarations]: Found implementation of procedure removePersonFromFloor [2023-11-23 21:16:51,501 INFO L130 BoogieDeclarations]: Found specification of procedure getOrigin [2023-11-23 21:16:51,501 INFO L138 BoogieDeclarations]: Found implementation of procedure getOrigin [2023-11-23 21:16:51,501 INFO L130 BoogieDeclarations]: Found specification of procedure continueInDirection [2023-11-23 21:16:51,501 INFO L138 BoogieDeclarations]: Found implementation of procedure continueInDirection [2023-11-23 21:16:51,502 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 21:16:51,502 INFO L130 BoogieDeclarations]: Found specification of procedure buttonForFloorIsPressed [2023-11-23 21:16:51,502 INFO L138 BoogieDeclarations]: Found implementation of procedure buttonForFloorIsPressed [2023-11-23 21:16:51,502 INFO L130 BoogieDeclarations]: Found specification of procedure pressInLiftFloorButton [2023-11-23 21:16:51,502 INFO L138 BoogieDeclarations]: Found implementation of procedure pressInLiftFloorButton [2023-11-23 21:16:51,503 INFO L130 BoogieDeclarations]: Found specification of procedure leaveElevator [2023-11-23 21:16:51,504 INFO L138 BoogieDeclarations]: Found implementation of procedure leaveElevator [2023-11-23 21:16:51,504 INFO L130 BoogieDeclarations]: Found specification of procedure isPersonOnFloor [2023-11-23 21:16:51,505 INFO L138 BoogieDeclarations]: Found implementation of procedure isPersonOnFloor [2023-11-23 21:16:51,505 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift__wrappee__twothirdsfull [2023-11-23 21:16:51,505 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift__wrappee__twothirdsfull [2023-11-23 21:16:51,505 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 21:16:51,506 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 21:16:51,506 INFO L130 BoogieDeclarations]: Found specification of procedure isFloorCalling [2023-11-23 21:16:51,506 INFO L138 BoogieDeclarations]: Found implementation of procedure isFloorCalling [2023-11-23 21:16:51,733 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 21:16:51,737 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 21:16:53,013 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 21:16:54,051 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 21:16:54,051 INFO L309 CfgBuilder]: Removed 1 assume(true) statements. [2023-11-23 21:16:54,054 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:16:54 BoogieIcfgContainer [2023-11-23 21:16:54,054 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 21:16:54,058 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 21:16:54,058 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 21:16:54,062 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 21:16:54,062 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:16:50" (1/3) ... [2023-11-23 21:16:54,063 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7e0cfff4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:16:54, skipping insertion in model container [2023-11-23 21:16:54,063 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:16:51" (2/3) ... [2023-11-23 21:16:54,065 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7e0cfff4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:16:54, skipping insertion in model container [2023-11-23 21:16:54,065 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:16:54" (3/3) ... [2023-11-23 21:16:54,067 INFO L112 eAbstractionObserver]: Analyzing ICFG elevator_spec3_product30.cil.c [2023-11-23 21:16:54,090 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 21:16:54,090 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-23 21:16:54,180 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 21:16:54,188 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;@653b4d24, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 21:16:54,189 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-23 21:16:54,199 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) [2023-11-23 21:16:54,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2023-11-23 21:16:54,217 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:16:54,218 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] [2023-11-23 21:16:54,219 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:16:54,227 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:16:54,227 INFO L85 PathProgramCache]: Analyzing trace with hash 152325223, now seen corresponding path program 1 times [2023-11-23 21:16:54,238 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:16:54,239 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [932863139] [2023-11-23 21:16:54,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:16:54,240 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:16:54,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:16:55,385 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-23 21:16:55,386 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:16:55,387 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [932863139] [2023-11-23 21:16:55,390 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [932863139] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:16:55,391 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:16:55,391 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-23 21:16:55,393 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [971893279] [2023-11-23 21:16:55,394 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:16:55,400 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-23 21:16:55,400 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:16:55,440 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-23 21:16:55,443 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:16:55,447 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) [2023-11-23 21:16:56,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:16:56,709 INFO L93 Difference]: Finished difference Result 1158 states and 1853 transitions. [2023-11-23 21:16:56,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-23 21:16:56,712 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 [2023-11-23 21:16:56,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:16:56,737 INFO L225 Difference]: With dead ends: 1158 [2023-11-23 21:16:56,737 INFO L226 Difference]: Without dead ends: 749 [2023-11-23 21:16:56,747 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 [2023-11-23 21:16:56,751 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, 1.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:16:56,752 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [532 Valid, 2807 Invalid, 742 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 704 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2023-11-23 21:16:56,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 749 states. [2023-11-23 21:16:56,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 749 to 743. [2023-11-23 21:16:56,904 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) [2023-11-23 21:16:56,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 743 states to 743 states and 1145 transitions. [2023-11-23 21:16:56,916 INFO L78 Accepts]: Start accepts. Automaton has 743 states and 1145 transitions. Word has length 49 [2023-11-23 21:16:56,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:16:56,917 INFO L495 AbstractCegarLoop]: Abstraction has 743 states and 1145 transitions. [2023-11-23 21:16:56,918 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) [2023-11-23 21:16:56,918 INFO L276 IsEmpty]: Start isEmpty. Operand 743 states and 1145 transitions. [2023-11-23 21:16:56,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2023-11-23 21:16:56,926 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:16:56,926 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] [2023-11-23 21:16:56,926 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 21:16:56,927 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:16:56,927 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:16:56,927 INFO L85 PathProgramCache]: Analyzing trace with hash -1886913394, now seen corresponding path program 1 times [2023-11-23 21:16:56,927 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:16:56,928 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1670725537] [2023-11-23 21:16:56,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:16:56,928 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:16:56,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:16:57,377 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-23 21:16:57,378 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:16:57,378 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1670725537] [2023-11-23 21:16:57,378 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1670725537] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:16:57,379 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:16:57,379 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:16:57,379 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [509737565] [2023-11-23 21:16:57,379 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:16:57,380 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:16:57,381 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:16:57,381 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:16:57,382 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:16:57,382 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) [2023-11-23 21:16:57,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:16:57,728 INFO L93 Difference]: Finished difference Result 2199 states and 3423 transitions. [2023-11-23 21:16:57,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:16:57,729 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 [2023-11-23 21:16:57,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:16:57,744 INFO L225 Difference]: With dead ends: 2199 [2023-11-23 21:16:57,744 INFO L226 Difference]: Without dead ends: 1469 [2023-11-23 21:16:57,750 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 [2023-11-23 21:16:57,752 INFO L413 NwaCegarLoop]: 610 mSDtfsCounter, 602 mSDsluCounter, 570 mSDsCounter, 0 mSdLazyCounter, 101 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 602 SdHoareTripleChecker+Valid, 1180 SdHoareTripleChecker+Invalid, 101 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:16:57,753 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [602 Valid, 1180 Invalid, 101 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 101 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 21:16:57,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1469 states. [2023-11-23 21:16:57,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1469 to 1397. [2023-11-23 21:16:57,883 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) [2023-11-23 21:16:57,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1397 states to 1397 states and 2177 transitions. [2023-11-23 21:16:57,909 INFO L78 Accepts]: Start accepts. Automaton has 1397 states and 2177 transitions. Word has length 50 [2023-11-23 21:16:57,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:16:57,910 INFO L495 AbstractCegarLoop]: Abstraction has 1397 states and 2177 transitions. [2023-11-23 21:16:57,910 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) [2023-11-23 21:16:57,910 INFO L276 IsEmpty]: Start isEmpty. Operand 1397 states and 2177 transitions. [2023-11-23 21:16:57,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2023-11-23 21:16:57,919 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:16:57,919 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] [2023-11-23 21:16:57,919 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-23 21:16:57,920 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:16:57,929 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:16:57,930 INFO L85 PathProgramCache]: Analyzing trace with hash 269450075, now seen corresponding path program 1 times [2023-11-23 21:16:57,930 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:16:57,930 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [512898229] [2023-11-23 21:16:57,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:16:57,930 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:16:58,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:16:58,623 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:16:58,624 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:16:58,624 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [512898229] [2023-11-23 21:16:58,624 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [512898229] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:16:58,624 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [906308637] [2023-11-23 21:16:58,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:16:58,625 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:16:58,625 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:16:58,628 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:16:58,664 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 21:16:59,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:16:59,094 INFO L262 TraceCheckSpWp]: Trace formula consists of 1805 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-23 21:16:59,110 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:16:59,233 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:16:59,233 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:16:59,233 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [906308637] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:16:59,233 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:16:59,234 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [10] total 12 [2023-11-23 21:16:59,234 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [574209232] [2023-11-23 21:16:59,234 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:16:59,235 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 21:16:59,235 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:16:59,235 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 21:16:59,236 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2023-11-23 21:16:59,236 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) [2023-11-23 21:16:59,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:16:59,551 INFO L93 Difference]: Finished difference Result 3094 states and 4830 transitions. [2023-11-23 21:16:59,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-23 21:16:59,552 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 [2023-11-23 21:16:59,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:16:59,568 INFO L225 Difference]: With dead ends: 3094 [2023-11-23 21:16:59,568 INFO L226 Difference]: Without dead ends: 1709 [2023-11-23 21:16:59,579 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 [2023-11-23 21:16:59,580 INFO L413 NwaCegarLoop]: 709 mSDtfsCounter, 424 mSDsluCounter, 1078 mSDsCounter, 0 mSdLazyCounter, 123 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 426 SdHoareTripleChecker+Valid, 1787 SdHoareTripleChecker+Invalid, 133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 123 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:16:59,582 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [426 Valid, 1787 Invalid, 133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 123 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 21:16:59,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1709 states. [2023-11-23 21:16:59,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1709 to 1691. [2023-11-23 21:16:59,714 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) [2023-11-23 21:16:59,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1691 states to 1691 states and 2614 transitions. [2023-11-23 21:16:59,734 INFO L78 Accepts]: Start accepts. Automaton has 1691 states and 2614 transitions. Word has length 86 [2023-11-23 21:16:59,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:16:59,736 INFO L495 AbstractCegarLoop]: Abstraction has 1691 states and 2614 transitions. [2023-11-23 21:16:59,736 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) [2023-11-23 21:16:59,737 INFO L276 IsEmpty]: Start isEmpty. Operand 1691 states and 2614 transitions. [2023-11-23 21:16:59,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2023-11-23 21:16:59,741 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:16:59,741 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] [2023-11-23 21:16:59,769 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 21:16:59,956 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:16:59,956 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:16:59,957 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:16:59,957 INFO L85 PathProgramCache]: Analyzing trace with hash 331625818, now seen corresponding path program 1 times [2023-11-23 21:16:59,957 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:16:59,957 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [436876763] [2023-11-23 21:16:59,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:16:59,958 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:17:00,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:17:00,419 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-23 21:17:00,419 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:17:00,420 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [436876763] [2023-11-23 21:17:00,420 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [436876763] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:17:00,420 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:17:00,420 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-23 21:17:00,420 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [389402223] [2023-11-23 21:17:00,422 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:17:00,422 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-23 21:17:00,423 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:17:00,423 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-23 21:17:00,424 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:17:00,424 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) [2023-11-23 21:17:01,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:17:01,373 INFO L93 Difference]: Finished difference Result 4291 states and 6779 transitions. [2023-11-23 21:17:01,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-23 21:17:01,374 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 [2023-11-23 21:17:01,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:17:01,405 INFO L225 Difference]: With dead ends: 4291 [2023-11-23 21:17:01,405 INFO L226 Difference]: Without dead ends: 2612 [2023-11-23 21:17:01,423 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 [2023-11-23 21:17:01,428 INFO L413 NwaCegarLoop]: 667 mSDtfsCounter, 636 mSDsluCounter, 2362 mSDsCounter, 0 mSdLazyCounter, 482 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 652 SdHoareTripleChecker+Valid, 3029 SdHoareTripleChecker+Invalid, 524 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 482 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-11-23 21:17:01,430 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [652 Valid, 3029 Invalid, 524 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 482 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-11-23 21:17:01,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2612 states. [2023-11-23 21:17:01,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2612 to 2474. [2023-11-23 21:17:01,661 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) [2023-11-23 21:17:01,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2474 states to 2474 states and 3850 transitions. [2023-11-23 21:17:01,693 INFO L78 Accepts]: Start accepts. Automaton has 2474 states and 3850 transitions. Word has length 87 [2023-11-23 21:17:01,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:17:01,695 INFO L495 AbstractCegarLoop]: Abstraction has 2474 states and 3850 transitions. [2023-11-23 21:17:01,695 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) [2023-11-23 21:17:01,696 INFO L276 IsEmpty]: Start isEmpty. Operand 2474 states and 3850 transitions. [2023-11-23 21:17:01,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2023-11-23 21:17:01,702 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:17:01,702 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] [2023-11-23 21:17:01,703 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-23 21:17:01,712 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:17:01,712 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:17:01,713 INFO L85 PathProgramCache]: Analyzing trace with hash 1398539297, now seen corresponding path program 1 times [2023-11-23 21:17:01,713 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:17:01,713 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1926802777] [2023-11-23 21:17:01,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:17:01,713 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:17:01,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:17:02,136 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:17:02,137 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:17:02,137 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1926802777] [2023-11-23 21:17:02,137 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1926802777] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:17:02,137 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1159419116] [2023-11-23 21:17:02,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:17:02,138 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:17:02,138 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:17:02,139 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:17:02,160 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 21:17:02,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:17:02,533 INFO L262 TraceCheckSpWp]: Trace formula consists of 1795 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:17:02,546 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:17:02,657 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:17:02,657 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:17:02,657 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1159419116] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:17:02,657 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:17:02,658 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-23 21:17:02,658 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1032127096] [2023-11-23 21:17:02,658 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:17:02,658 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:17:02,659 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:17:02,660 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:17:02,660 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:17:02,661 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) [2023-11-23 21:17:03,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:17:03,169 INFO L93 Difference]: Finished difference Result 6967 states and 11236 transitions. [2023-11-23 21:17:03,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:17:03,170 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 [2023-11-23 21:17:03,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:17:03,224 INFO L225 Difference]: With dead ends: 6967 [2023-11-23 21:17:03,224 INFO L226 Difference]: Without dead ends: 4505 [2023-11-23 21:17:03,251 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 [2023-11-23 21:17:03,253 INFO L413 NwaCegarLoop]: 606 mSDtfsCounter, 564 mSDsluCounter, 505 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s 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, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:17:03,254 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [564 Valid, 1111 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:17:03,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4505 states. [2023-11-23 21:17:03,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4505 to 4295. [2023-11-23 21:17:03,611 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) [2023-11-23 21:17:03,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4295 states to 4295 states and 6753 transitions. [2023-11-23 21:17:03,650 INFO L78 Accepts]: Start accepts. Automaton has 4295 states and 6753 transitions. Word has length 86 [2023-11-23 21:17:03,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:17:03,653 INFO L495 AbstractCegarLoop]: Abstraction has 4295 states and 6753 transitions. [2023-11-23 21:17:03,654 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) [2023-11-23 21:17:03,654 INFO L276 IsEmpty]: Start isEmpty. Operand 4295 states and 6753 transitions. [2023-11-23 21:17:03,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2023-11-23 21:17:03,660 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:17:03,660 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] [2023-11-23 21:17:03,693 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 21:17:03,874 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:17:03,875 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:17:03,875 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:17:03,875 INFO L85 PathProgramCache]: Analyzing trace with hash 606161869, now seen corresponding path program 1 times [2023-11-23 21:17:03,875 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:17:03,875 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [474536160] [2023-11-23 21:17:03,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:17:03,876 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:17:03,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:17:04,247 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:17:04,247 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:17:04,247 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [474536160] [2023-11-23 21:17:04,247 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [474536160] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:17:04,248 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [308474741] [2023-11-23 21:17:04,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:17:04,248 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:17:04,248 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:17:04,252 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:17:04,275 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 21:17:04,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:17:04,653 INFO L262 TraceCheckSpWp]: Trace formula consists of 1795 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-23 21:17:04,659 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:17:04,737 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:17:04,737 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:17:04,738 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [308474741] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:17:04,738 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:17:04,738 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-11-23 21:17:04,738 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2127357568] [2023-11-23 21:17:04,739 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:17:04,739 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:17:04,739 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:17:04,740 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:17:04,740 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:17:04,740 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) [2023-11-23 21:17:05,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:17:05,276 INFO L93 Difference]: Finished difference Result 9753 states and 15625 transitions. [2023-11-23 21:17:05,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:17:05,276 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 [2023-11-23 21:17:05,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:17:05,330 INFO L225 Difference]: With dead ends: 9753 [2023-11-23 21:17:05,330 INFO L226 Difference]: Without dead ends: 5470 [2023-11-23 21:17:05,367 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 [2023-11-23 21:17:05,368 INFO L413 NwaCegarLoop]: 645 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, 1149 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 [2023-11-23 21:17:05,368 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [562 Valid, 1149 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 87 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 21:17:05,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5470 states. [2023-11-23 21:17:05,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5470 to 5316. [2023-11-23 21:17:05,862 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) [2023-11-23 21:17:05,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5316 states to 5316 states and 8380 transitions. [2023-11-23 21:17:05,916 INFO L78 Accepts]: Start accepts. Automaton has 5316 states and 8380 transitions. Word has length 86 [2023-11-23 21:17:05,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:17:05,917 INFO L495 AbstractCegarLoop]: Abstraction has 5316 states and 8380 transitions. [2023-11-23 21:17:05,918 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) [2023-11-23 21:17:05,918 INFO L276 IsEmpty]: Start isEmpty. Operand 5316 states and 8380 transitions. [2023-11-23 21:17:05,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2023-11-23 21:17:05,927 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:17:05,927 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] [2023-11-23 21:17:05,955 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-23 21:17:06,150 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:17:06,150 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:17:06,150 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:17:06,151 INFO L85 PathProgramCache]: Analyzing trace with hash 623410034, now seen corresponding path program 1 times [2023-11-23 21:17:06,151 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:17:06,151 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1427017019] [2023-11-23 21:17:06,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:17:06,151 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:17:06,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:17:07,035 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-23 21:17:07,035 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:17:07,035 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1427017019] [2023-11-23 21:17:07,036 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1427017019] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:17:07,036 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [417216205] [2023-11-23 21:17:07,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:17:07,038 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:17:07,038 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:17:07,040 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:17:07,063 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 21:17:07,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:17:07,455 INFO L262 TraceCheckSpWp]: Trace formula consists of 1821 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-23 21:17:07,461 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:17:07,517 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-23 21:17:07,518 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:17:07,518 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [417216205] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:17:07,518 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:17:07,518 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10] total 13 [2023-11-23 21:17:07,519 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1626180157] [2023-11-23 21:17:07,519 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:17:07,520 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 21:17:07,520 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:17:07,521 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 21:17:07,521 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=130, Unknown=0, NotChecked=0, Total=156 [2023-11-23 21:17:07,521 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) [2023-11-23 21:17:08,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:17:08,311 INFO L93 Difference]: Finished difference Result 10485 states and 16892 transitions. [2023-11-23 21:17:08,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-23 21:17:08,312 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 [2023-11-23 21:17:08,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:17:08,382 INFO L225 Difference]: With dead ends: 10485 [2023-11-23 21:17:08,382 INFO L226 Difference]: Without dead ends: 6396 [2023-11-23 21:17:08,418 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 [2023-11-23 21:17:08,419 INFO L413 NwaCegarLoop]: 597 mSDtfsCounter, 177 mSDsluCounter, 1786 mSDsCounter, 0 mSdLazyCounter, 165 mSolverCounterSat, 129 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s 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 [2023-11-23 21:17:08,419 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] [2023-11-23 21:17:08,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6396 states. [2023-11-23 21:17:08,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6396 to 5361. [2023-11-23 21:17:08,900 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) [2023-11-23 21:17:08,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5361 states to 5361 states and 8425 transitions. [2023-11-23 21:17:08,948 INFO L78 Accepts]: Start accepts. Automaton has 5361 states and 8425 transitions. Word has length 93 [2023-11-23 21:17:08,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:17:08,949 INFO L495 AbstractCegarLoop]: Abstraction has 5361 states and 8425 transitions. [2023-11-23 21:17:08,949 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) [2023-11-23 21:17:08,949 INFO L276 IsEmpty]: Start isEmpty. Operand 5361 states and 8425 transitions. [2023-11-23 21:17:08,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2023-11-23 21:17:08,954 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:17:08,954 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] [2023-11-23 21:17:08,982 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-23 21:17:09,168 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:17:09,168 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:17:09,169 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:17:09,169 INFO L85 PathProgramCache]: Analyzing trace with hash -75363410, now seen corresponding path program 1 times [2023-11-23 21:17:09,169 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:17:09,169 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [630669577] [2023-11-23 21:17:09,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:17:09,170 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:17:09,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:17:09,930 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-23 21:17:09,930 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:17:09,930 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [630669577] [2023-11-23 21:17:09,931 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [630669577] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:17:09,931 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [108595692] [2023-11-23 21:17:09,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:17:09,931 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:17:09,931 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:17:09,932 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:17:09,953 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-23 21:17:10,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:17:10,323 INFO L262 TraceCheckSpWp]: Trace formula consists of 1827 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-23 21:17:10,329 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:17:10,545 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-23 21:17:10,545 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:17:11,095 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-23 21:17:11,095 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [108595692] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-23 21:17:11,095 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-23 21:17:11,096 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [10, 9] total 22 [2023-11-23 21:17:11,096 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [693584752] [2023-11-23 21:17:11,096 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:17:11,097 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-23 21:17:11,097 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:17:11,097 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-23 21:17:11,098 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=405, Unknown=0, NotChecked=0, Total=462 [2023-11-23 21:17:11,098 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) [2023-11-23 21:17:14,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:17:14,099 INFO L93 Difference]: Finished difference Result 10547 states and 16774 transitions. [2023-11-23 21:17:14,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-11-23 21:17:14,100 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 [2023-11-23 21:17:14,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:17:14,156 INFO L225 Difference]: With dead ends: 10547 [2023-11-23 21:17:14,157 INFO L226 Difference]: Without dead ends: 6437 [2023-11-23 21:17:14,181 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 [2023-11-23 21:17:14,182 INFO L413 NwaCegarLoop]: 597 mSDtfsCounter, 1449 mSDsluCounter, 2021 mSDsCounter, 0 mSdLazyCounter, 2300 mSolverCounterSat, 356 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1536 SdHoareTripleChecker+Valid, 2618 SdHoareTripleChecker+Invalid, 2656 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 356 IncrementalHoareTripleChecker+Valid, 2300 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2023-11-23 21:17:14,182 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1536 Valid, 2618 Invalid, 2656 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [356 Valid, 2300 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2023-11-23 21:17:14,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6437 states. [2023-11-23 21:17:14,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6437 to 5601. [2023-11-23 21:17:14,839 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) [2023-11-23 21:17:14,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5601 states to 5601 states and 8814 transitions. [2023-11-23 21:17:14,911 INFO L78 Accepts]: Start accepts. Automaton has 5601 states and 8814 transitions. Word has length 95 [2023-11-23 21:17:14,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:17:14,913 INFO L495 AbstractCegarLoop]: Abstraction has 5601 states and 8814 transitions. [2023-11-23 21:17:14,913 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) [2023-11-23 21:17:14,913 INFO L276 IsEmpty]: Start isEmpty. Operand 5601 states and 8814 transitions. [2023-11-23 21:17:14,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2023-11-23 21:17:14,920 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:17:14,921 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] [2023-11-23 21:17:14,948 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-23 21:17:15,143 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-11-23 21:17:15,144 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:17:15,144 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:17:15,144 INFO L85 PathProgramCache]: Analyzing trace with hash -1028465790, now seen corresponding path program 1 times [2023-11-23 21:17:15,145 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:17:15,145 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1231967108] [2023-11-23 21:17:15,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:17:15,145 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:17:15,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:17:15,949 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-23 21:17:15,949 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:17:15,950 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1231967108] [2023-11-23 21:17:15,950 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1231967108] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:17:15,950 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1932301626] [2023-11-23 21:17:15,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:17:15,950 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:17:15,950 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:17:15,951 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:17:15,972 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-23 21:17:16,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:17:16,407 INFO L262 TraceCheckSpWp]: Trace formula consists of 1826 conjuncts, 19 conjunts are in the unsatisfiable core [2023-11-23 21:17:16,414 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:17:16,661 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-23 21:17:16,661 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:17:17,119 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-11-23 21:17:17,119 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1932301626] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-23 21:17:17,120 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-23 21:17:17,120 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [10, 9] total 21 [2023-11-23 21:17:17,120 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [496807395] [2023-11-23 21:17:17,120 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:17:17,121 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-11-23 21:17:17,121 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:17:17,122 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-11-23 21:17:17,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=362, Unknown=0, NotChecked=0, Total=420 [2023-11-23 21:17:17,123 INFO L87 Difference]: Start difference. First operand 5601 states and 8814 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) [2023-11-23 21:17:21,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:17:21,790 INFO L93 Difference]: Finished difference Result 16166 states and 27800 transitions. [2023-11-23 21:17:21,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-11-23 21:17:21,791 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 [2023-11-23 21:17:21,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:17:21,901 INFO L225 Difference]: With dead ends: 16166 [2023-11-23 21:17:21,902 INFO L226 Difference]: Without dead ends: 12380 [2023-11-23 21:17:21,940 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 188 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=196, Invalid=1136, Unknown=0, NotChecked=0, Total=1332 [2023-11-23 21:17:21,943 INFO L413 NwaCegarLoop]: 666 mSDtfsCounter, 3769 mSDsluCounter, 2223 mSDsCounter, 0 mSdLazyCounter, 2101 mSolverCounterSat, 1778 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3867 SdHoareTripleChecker+Valid, 2889 SdHoareTripleChecker+Invalid, 3879 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 1778 IncrementalHoareTripleChecker+Valid, 2101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:17:21,943 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3867 Valid, 2889 Invalid, 3879 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [1778 Valid, 2101 Invalid, 0 Unknown, 0 Unchecked, 3.2s Time] [2023-11-23 21:17:21,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12380 states. [2023-11-23 21:17:22,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12380 to 10919. [2023-11-23 21:17:23,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10919 states, 7728 states have (on average 1.4887422360248448) internal successors, (11505), 8079 states have internal predecessors, (11505), 2354 states have call successors, (2354), 684 states have call predecessors, (2354), 836 states have return successors, (4079), 2315 states have call predecessors, (4079), 2337 states have call successors, (4079) [2023-11-23 21:17:23,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10919 states to 10919 states and 17938 transitions. [2023-11-23 21:17:23,111 INFO L78 Accepts]: Start accepts. Automaton has 10919 states and 17938 transitions. Word has length 97 [2023-11-23 21:17:23,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:17:23,112 INFO L495 AbstractCegarLoop]: Abstraction has 10919 states and 17938 transitions. [2023-11-23 21:17:23,112 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) [2023-11-23 21:17:23,112 INFO L276 IsEmpty]: Start isEmpty. Operand 10919 states and 17938 transitions. [2023-11-23 21:17:23,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2023-11-23 21:17:23,118 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:17:23,119 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] [2023-11-23 21:17:23,149 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-23 21:17:23,340 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:17:23,340 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:17:23,340 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:17:23,341 INFO L85 PathProgramCache]: Analyzing trace with hash -1356590826, now seen corresponding path program 1 times [2023-11-23 21:17:23,341 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:17:23,341 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [438307168] [2023-11-23 21:17:23,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:17:23,341 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:17:23,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:17:24,301 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-23 21:17:24,301 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:17:24,302 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [438307168] [2023-11-23 21:17:24,302 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [438307168] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:17:24,302 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1651434100] [2023-11-23 21:17:24,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:17:24,302 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:17:24,303 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:17:24,304 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:17:24,332 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-23 21:17:24,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:17:24,729 INFO L262 TraceCheckSpWp]: Trace formula consists of 1844 conjuncts, 9 conjunts are in the unsatisfiable core [2023-11-23 21:17:24,737 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:17:24,898 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-23 21:17:24,898 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:17:25,270 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-23 21:17:25,271 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1651434100] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-23 21:17:25,271 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-23 21:17:25,271 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [10, 7] total 17 [2023-11-23 21:17:25,272 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1948036190] [2023-11-23 21:17:25,272 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:17:25,272 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-23 21:17:25,273 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:17:25,273 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-23 21:17:25,274 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272 [2023-11-23 21:17:25,274 INFO L87 Difference]: Start difference. First operand 10919 states and 17938 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) [2023-11-23 21:17:28,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:17:28,074 INFO L93 Difference]: Finished difference Result 21547 states and 36025 transitions. [2023-11-23 21:17:28,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-23 21:17:28,075 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 [2023-11-23 21:17:28,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:17:28,170 INFO L225 Difference]: With dead ends: 21547 [2023-11-23 21:17:28,170 INFO L226 Difference]: Without dead ends: 12443 [2023-11-23 21:17:28,225 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 [2023-11-23 21:17:28,226 INFO L413 NwaCegarLoop]: 641 mSDtfsCounter, 934 mSDsluCounter, 1485 mSDsCounter, 0 mSdLazyCounter, 1754 mSolverCounterSat, 102 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1031 SdHoareTripleChecker+Valid, 2126 SdHoareTripleChecker+Invalid, 1856 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 102 IncrementalHoareTripleChecker+Valid, 1754 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2023-11-23 21:17:28,228 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1031 Valid, 2126 Invalid, 1856 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [102 Valid, 1754 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2023-11-23 21:17:28,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12443 states. [2023-11-23 21:17:29,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12443 to 10907. [2023-11-23 21:17:29,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10907 states, 7728 states have (on average 1.4887422360248448) internal successors, (11505), 8067 states have internal predecessors, (11505), 2342 states have call successors, (2342), 684 states have call predecessors, (2342), 836 states have return successors, (4043), 2315 states have call predecessors, (4043), 2325 states have call successors, (4043) [2023-11-23 21:17:29,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10907 states to 10907 states and 17890 transitions. [2023-11-23 21:17:29,385 INFO L78 Accepts]: Start accepts. Automaton has 10907 states and 17890 transitions. Word has length 102 [2023-11-23 21:17:29,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:17:29,386 INFO L495 AbstractCegarLoop]: Abstraction has 10907 states and 17890 transitions. [2023-11-23 21:17:29,386 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) [2023-11-23 21:17:29,386 INFO L276 IsEmpty]: Start isEmpty. Operand 10907 states and 17890 transitions. [2023-11-23 21:17:29,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2023-11-23 21:17:29,394 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:17:29,394 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] [2023-11-23 21:17:29,422 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-23 21:17:29,608 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-23 21:17:29,608 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:17:29,609 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:17:29,609 INFO L85 PathProgramCache]: Analyzing trace with hash -396989533, now seen corresponding path program 1 times [2023-11-23 21:17:29,609 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:17:29,609 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1641744430] [2023-11-23 21:17:29,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:17:29,609 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:17:29,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:17:30,321 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2023-11-23 21:17:30,322 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:17:30,322 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1641744430] [2023-11-23 21:17:30,322 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1641744430] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:17:30,322 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1297614237] [2023-11-23 21:17:30,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:17:30,323 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:17:30,323 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:17:30,324 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:17:30,329 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_539554e1-8511-4156-b9c8-8cb033934866/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process