./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/elevator_spec1_product20.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 30e01a73 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adf02789-be18-414d-a2f3-dee847575863/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adf02789-be18-414d-a2f3-dee847575863/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_adf02789-be18-414d-a2f3-dee847575863/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adf02789-be18-414d-a2f3-dee847575863/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/elevator_spec1_product20.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adf02789-be18-414d-a2f3-dee847575863/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_adf02789-be18-414d-a2f3-dee847575863/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 3f11976cf57fe8d65e71fe2317840ceb817472b70b756607274947c31f43df4d --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 20:33:37,664 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 20:33:37,732 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adf02789-be18-414d-a2f3-dee847575863/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-23 20:33:37,738 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 20:33:37,739 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 20:33:37,767 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 20:33:37,767 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 20:33:37,768 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 20:33:37,769 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 20:33:37,770 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 20:33:37,770 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 20:33:37,771 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 20:33:37,772 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 20:33:37,772 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 20:33:37,773 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 20:33:37,773 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 20:33:37,774 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 20:33:37,774 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 20:33:37,775 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 20:33:37,776 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 20:33:37,776 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 20:33:37,777 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 20:33:37,778 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 20:33:37,778 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 20:33:37,779 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 20:33:37,779 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 20:33:37,780 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 20:33:37,780 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 20:33:37,780 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 20:33:37,781 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 20:33:37,781 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 20:33:37,782 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 20:33:37,782 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 20:33:37,783 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 20:33:37,783 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 20:33:37,783 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 20:33:37,784 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 20:33:37,784 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 20:33:37,784 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 20:33:37,785 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 20:33:37,785 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 20:33:37,785 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 20:33:37,786 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 20:33:37,786 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 20:33:37,786 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 20:33:37,787 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 20:33:37,787 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 20:33:37,787 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_adf02789-be18-414d-a2f3-dee847575863/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adf02789-be18-414d-a2f3-dee847575863/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 3f11976cf57fe8d65e71fe2317840ceb817472b70b756607274947c31f43df4d [2023-11-23 20:33:38,010 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 20:33:38,031 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 20:33:38,034 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 20:33:38,035 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 20:33:38,036 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 20:33:38,037 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adf02789-be18-414d-a2f3-dee847575863/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/product-lines/elevator_spec1_product20.cil.c [2023-11-23 20:33:41,119 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 20:33:41,516 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 20:33:41,517 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adf02789-be18-414d-a2f3-dee847575863/sv-benchmarks/c/product-lines/elevator_spec1_product20.cil.c [2023-11-23 20:33:41,540 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adf02789-be18-414d-a2f3-dee847575863/bin/utaipan-verify-mE87zJ7Ire/data/f6012a58c/335badd2bbbc41d0982f5417d9d34172/FLAG290feb007 [2023-11-23 20:33:41,555 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adf02789-be18-414d-a2f3-dee847575863/bin/utaipan-verify-mE87zJ7Ire/data/f6012a58c/335badd2bbbc41d0982f5417d9d34172 [2023-11-23 20:33:41,558 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 20:33:41,560 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 20:33:41,561 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 20:33:41,562 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 20:33:41,567 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 20:33:41,568 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:33:41" (1/1) ... [2023-11-23 20:33:41,570 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@63964fe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:33:41, skipping insertion in model container [2023-11-23 20:33:41,570 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:33:41" (1/1) ... [2023-11-23 20:33:41,647 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 20:33:42,178 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_adf02789-be18-414d-a2f3-dee847575863/sv-benchmarks/c/product-lines/elevator_spec1_product20.cil.c[45414,45427] [2023-11-23 20:33:42,308 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 20:33:42,325 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 20:33:42,336 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Elevator.i","") [48] [2023-11-23 20:33:42,338 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"libacc.i","") [1639] [2023-11-23 20:33:42,339 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"scenario.i","") [2005] [2023-11-23 20:33:42,339 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"featureselect.i","") [2021] [2023-11-23 20:33:42,340 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"wsllib_check.i","") [2059] [2023-11-23 20:33:42,340 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"UnitTests.i","") [2068] [2023-11-23 20:33:42,341 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Floor.i","") [2162] [2023-11-23 20:33:42,341 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Test.i","") [2828] [2023-11-23 20:33:42,341 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Specification1_spec.i","") [3180] [2023-11-23 20:33:42,342 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Person.i","") [3361] [2023-11-23 20:33:42,469 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_adf02789-be18-414d-a2f3-dee847575863/sv-benchmarks/c/product-lines/elevator_spec1_product20.cil.c[45414,45427] [2023-11-23 20:33:42,496 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 20:33:42,536 INFO L206 MainTranslator]: Completed translation [2023-11-23 20:33:42,536 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:33:42 WrapperNode [2023-11-23 20:33:42,537 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 20:33:42,538 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 20:33:42,538 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 20:33:42,538 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 20:33:42,546 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:33:42" (1/1) ... [2023-11-23 20:33:42,576 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:33:42" (1/1) ... [2023-11-23 20:33:42,647 INFO L138 Inliner]: procedures = 96, calls = 347, calls flagged for inlining = 26, calls inlined = 22, statements flattened = 1122 [2023-11-23 20:33:42,647 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 20:33:42,661 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 20:33:42,661 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 20:33:42,661 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 20:33:42,672 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:33:42" (1/1) ... [2023-11-23 20:33:42,672 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:33:42" (1/1) ... [2023-11-23 20:33:42,682 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:33:42" (1/1) ... [2023-11-23 20:33:42,682 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:33:42" (1/1) ... [2023-11-23 20:33:42,707 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:33:42" (1/1) ... [2023-11-23 20:33:42,724 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:33:42" (1/1) ... [2023-11-23 20:33:42,729 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:33:42" (1/1) ... [2023-11-23 20:33:42,735 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:33:42" (1/1) ... [2023-11-23 20:33:42,745 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 20:33:42,746 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 20:33:42,746 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 20:33:42,746 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 20:33:42,747 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:33:42" (1/1) ... [2023-11-23 20:33:42,772 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 20:33:42,799 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adf02789-be18-414d-a2f3-dee847575863/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:33:42,823 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adf02789-be18-414d-a2f3-dee847575863/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 20:33:42,864 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adf02789-be18-414d-a2f3-dee847575863/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 20:33:42,908 INFO L130 BoogieDeclarations]: Found specification of procedure angelinaCall [2023-11-23 20:33:42,908 INFO L138 BoogieDeclarations]: Found implementation of procedure angelinaCall [2023-11-23 20:33:42,908 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 20:33:42,909 INFO L130 BoogieDeclarations]: Found specification of procedure getWeight [2023-11-23 20:33:42,909 INFO L138 BoogieDeclarations]: Found implementation of procedure getWeight [2023-11-23 20:33:42,910 INFO L130 BoogieDeclarations]: Found specification of procedure bigMacCall [2023-11-23 20:33:42,910 INFO L138 BoogieDeclarations]: Found implementation of procedure bigMacCall [2023-11-23 20:33:42,910 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedAtCurrentFloor__wrappee__weight [2023-11-23 20:33:42,911 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedAtCurrentFloor__wrappee__weight [2023-11-23 20:33:42,911 INFO L130 BoogieDeclarations]: Found specification of procedure enterElevator [2023-11-23 20:33:42,911 INFO L138 BoogieDeclarations]: Found implementation of procedure enterElevator [2023-11-23 20:33:42,911 INFO L130 BoogieDeclarations]: Found specification of procedure isExecutiveFloorCalling [2023-11-23 20:33:42,912 INFO L138 BoogieDeclarations]: Found implementation of procedure isExecutiveFloorCalling [2023-11-23 20:33:42,913 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection [2023-11-23 20:33:42,913 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection [2023-11-23 20:33:42,913 INFO L130 BoogieDeclarations]: Found specification of procedure getReverseHeading [2023-11-23 20:33:42,915 INFO L138 BoogieDeclarations]: Found implementation of procedure getReverseHeading [2023-11-23 20:33:42,916 INFO L130 BoogieDeclarations]: Found specification of procedure cleanup [2023-11-23 20:33:42,916 INFO L138 BoogieDeclarations]: Found implementation of procedure cleanup [2023-11-23 20:33:42,916 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift [2023-11-23 20:33:42,916 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift [2023-11-23 20:33:42,916 INFO L130 BoogieDeclarations]: Found specification of procedure areDoorsOpen [2023-11-23 20:33:42,917 INFO L138 BoogieDeclarations]: Found implementation of procedure areDoorsOpen [2023-11-23 20:33:42,940 INFO L130 BoogieDeclarations]: Found specification of procedure __automaton_fail [2023-11-23 20:33:42,940 INFO L138 BoogieDeclarations]: Found implementation of procedure __automaton_fail [2023-11-23 20:33:42,940 INFO L130 BoogieDeclarations]: Found specification of procedure isTopFloor [2023-11-23 20:33:42,940 INFO L138 BoogieDeclarations]: Found implementation of procedure isTopFloor [2023-11-23 20:33:42,940 INFO L130 BoogieDeclarations]: Found specification of procedure getDestination [2023-11-23 20:33:42,940 INFO L138 BoogieDeclarations]: Found implementation of procedure getDestination [2023-11-23 20:33:42,940 INFO L130 BoogieDeclarations]: Found specification of procedure isBlocked [2023-11-23 20:33:42,941 INFO L138 BoogieDeclarations]: Found implementation of procedure isBlocked [2023-11-23 20:33:42,941 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentFloorID [2023-11-23 20:33:42,941 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentFloorID [2023-11-23 20:33:42,941 INFO L130 BoogieDeclarations]: Found specification of procedure resetCallOnFloor [2023-11-23 20:33:42,941 INFO L138 BoogieDeclarations]: Found implementation of procedure resetCallOnFloor [2023-11-23 20:33:42,941 INFO L130 BoogieDeclarations]: Found specification of procedure initPersonOnFloor [2023-11-23 20:33:42,941 INFO L138 BoogieDeclarations]: Found implementation of procedure initPersonOnFloor [2023-11-23 20:33:42,941 INFO L130 BoogieDeclarations]: Found specification of procedure removePersonFromFloor [2023-11-23 20:33:42,941 INFO L138 BoogieDeclarations]: Found implementation of procedure removePersonFromFloor [2023-11-23 20:33:42,941 INFO L130 BoogieDeclarations]: Found specification of procedure getOrigin [2023-11-23 20:33:42,941 INFO L138 BoogieDeclarations]: Found implementation of procedure getOrigin [2023-11-23 20:33:42,942 INFO L130 BoogieDeclarations]: Found specification of procedure continueInDirection [2023-11-23 20:33:42,942 INFO L138 BoogieDeclarations]: Found implementation of procedure continueInDirection [2023-11-23 20:33:42,942 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 20:33:42,942 INFO L130 BoogieDeclarations]: Found specification of procedure pressInLiftFloorButton [2023-11-23 20:33:42,942 INFO L138 BoogieDeclarations]: Found implementation of procedure pressInLiftFloorButton [2023-11-23 20:33:42,942 INFO L130 BoogieDeclarations]: Found specification of procedure leaveElevator [2023-11-23 20:33:42,942 INFO L138 BoogieDeclarations]: Found implementation of procedure leaveElevator [2023-11-23 20:33:42,942 INFO L130 BoogieDeclarations]: Found specification of procedure isPersonOnFloor [2023-11-23 20:33:42,942 INFO L138 BoogieDeclarations]: Found implementation of procedure isPersonOnFloor [2023-11-23 20:33:42,943 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 20:33:42,943 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 20:33:42,943 INFO L130 BoogieDeclarations]: Found specification of procedure isFloorCalling [2023-11-23 20:33:42,943 INFO L138 BoogieDeclarations]: Found implementation of procedure isFloorCalling [2023-11-23 20:33:42,943 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift__wrappee__executivefloor [2023-11-23 20:33:42,943 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift__wrappee__executivefloor [2023-11-23 20:33:43,152 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 20:33:43,155 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 20:33:44,308 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 20:33:45,294 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 20:33:45,294 INFO L309 CfgBuilder]: Removed 1 assume(true) statements. [2023-11-23 20:33:45,296 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:33:45 BoogieIcfgContainer [2023-11-23 20:33:45,296 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 20:33:45,301 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 20:33:45,302 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 20:33:45,305 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 20:33:45,305 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 08:33:41" (1/3) ... [2023-11-23 20:33:45,306 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6660bed0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 08:33:45, skipping insertion in model container [2023-11-23 20:33:45,307 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:33:42" (2/3) ... [2023-11-23 20:33:45,308 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6660bed0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 08:33:45, skipping insertion in model container [2023-11-23 20:33:45,309 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:33:45" (3/3) ... [2023-11-23 20:33:45,312 INFO L112 eAbstractionObserver]: Analyzing ICFG elevator_spec1_product20.cil.c [2023-11-23 20:33:45,336 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 20:33:45,337 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-23 20:33:45,407 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 20:33:45,414 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;@75796dba, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 20:33:45,415 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-23 20:33:45,422 INFO L276 IsEmpty]: Start isEmpty. Operand has 390 states, 260 states have (on average 1.5846153846153845) internal successors, (412), 283 states have internal predecessors, (412), 102 states have call successors, (102), 26 states have call predecessors, (102), 26 states have return successors, (102), 95 states have call predecessors, (102), 102 states have call successors, (102) [2023-11-23 20:33:45,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2023-11-23 20:33:45,437 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:33:45,438 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] [2023-11-23 20:33:45,439 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:33:45,445 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:33:45,445 INFO L85 PathProgramCache]: Analyzing trace with hash -672504028, now seen corresponding path program 1 times [2023-11-23 20:33:45,456 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:33:45,456 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [388662060] [2023-11-23 20:33:45,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:33:45,457 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:33:45,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:33:46,651 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-23 20:33:46,651 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:33:46,652 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [388662060] [2023-11-23 20:33:46,652 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [388662060] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:33:46,653 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:33:46,653 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-23 20:33:46,655 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1231321734] [2023-11-23 20:33:46,656 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:33:46,661 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-23 20:33:46,661 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:33:46,702 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-23 20:33:46,704 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:33:46,709 INFO L87 Difference]: Start difference. First operand has 390 states, 260 states have (on average 1.5846153846153845) internal successors, (412), 283 states have internal predecessors, (412), 102 states have call successors, (102), 26 states have call predecessors, (102), 26 states have return successors, (102), 95 states have call predecessors, (102), 102 states have call successors, (102) Second operand has 6 states, 6 states have (on average 5.166666666666667) internal successors, (31), 6 states have internal predecessors, (31), 6 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (10), 5 states have call predecessors, (10), 5 states have call successors, (10) [2023-11-23 20:33:49,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:33:49,054 INFO L93 Difference]: Finished difference Result 1260 states and 2036 transitions. [2023-11-23 20:33:49,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 20:33:49,057 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 5.166666666666667) internal successors, (31), 6 states have internal predecessors, (31), 6 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (10), 5 states have call predecessors, (10), 5 states have call successors, (10) Word has length 54 [2023-11-23 20:33:49,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:33:49,085 INFO L225 Difference]: With dead ends: 1260 [2023-11-23 20:33:49,089 INFO L226 Difference]: Without dead ends: 887 [2023-11-23 20:33:49,100 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2023-11-23 20:33:49,108 INFO L413 NwaCegarLoop]: 304 mSDtfsCounter, 1236 mSDsluCounter, 730 mSDsCounter, 0 mSdLazyCounter, 1436 mSolverCounterSat, 457 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1304 SdHoareTripleChecker+Valid, 1034 SdHoareTripleChecker+Invalid, 1893 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 457 IncrementalHoareTripleChecker+Valid, 1436 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2023-11-23 20:33:49,110 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1304 Valid, 1034 Invalid, 1893 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [457 Valid, 1436 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2023-11-23 20:33:49,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 887 states. [2023-11-23 20:33:49,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 887 to 800. [2023-11-23 20:33:49,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 800 states, 559 states have (on average 1.5992844364937389) internal successors, (894), 589 states have internal predecessors, (894), 195 states have call successors, (195), 44 states have call predecessors, (195), 45 states have return successors, (197), 179 states have call predecessors, (197), 190 states have call successors, (197) [2023-11-23 20:33:49,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 800 states to 800 states and 1286 transitions. [2023-11-23 20:33:49,297 INFO L78 Accepts]: Start accepts. Automaton has 800 states and 1286 transitions. Word has length 54 [2023-11-23 20:33:49,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:33:49,298 INFO L495 AbstractCegarLoop]: Abstraction has 800 states and 1286 transitions. [2023-11-23 20:33:49,299 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 5.166666666666667) internal successors, (31), 6 states have internal predecessors, (31), 6 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (10), 5 states have call predecessors, (10), 5 states have call successors, (10) [2023-11-23 20:33:49,299 INFO L276 IsEmpty]: Start isEmpty. Operand 800 states and 1286 transitions. [2023-11-23 20:33:49,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2023-11-23 20:33:49,311 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:33:49,312 INFO L195 NwaCegarLoop]: trace histogram [3, 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] [2023-11-23 20:33:49,312 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 20:33:49,313 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:33:49,313 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:33:49,314 INFO L85 PathProgramCache]: Analyzing trace with hash 1090679233, now seen corresponding path program 1 times [2023-11-23 20:33:49,314 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:33:49,314 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [310215802] [2023-11-23 20:33:49,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:33:49,315 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:33:49,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:33:50,171 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-23 20:33:50,171 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:33:50,172 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [310215802] [2023-11-23 20:33:50,172 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [310215802] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:33:50,172 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:33:50,172 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-11-23 20:33:50,173 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [509911093] [2023-11-23 20:33:50,173 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:33:50,174 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-23 20:33:50,175 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:33:50,175 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-23 20:33:50,176 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-23 20:33:50,176 INFO L87 Difference]: Start difference. First operand 800 states and 1286 transitions. Second operand has 7 states, 7 states have (on average 7.571428571428571) internal successors, (53), 7 states have internal predecessors, (53), 5 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (18), 5 states have call predecessors, (18), 4 states have call successors, (18) [2023-11-23 20:33:52,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:33:52,494 INFO L93 Difference]: Finished difference Result 2486 states and 4046 transitions. [2023-11-23 20:33:52,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-23 20:33:52,495 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 7.571428571428571) internal successors, (53), 7 states have internal predecessors, (53), 5 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (18), 5 states have call predecessors, (18), 4 states have call successors, (18) Word has length 99 [2023-11-23 20:33:52,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:33:52,518 INFO L225 Difference]: With dead ends: 2486 [2023-11-23 20:33:52,518 INFO L226 Difference]: Without dead ends: 1710 [2023-11-23 20:33:52,528 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2023-11-23 20:33:52,530 INFO L413 NwaCegarLoop]: 387 mSDtfsCounter, 1166 mSDsluCounter, 1272 mSDsCounter, 0 mSdLazyCounter, 2255 mSolverCounterSat, 447 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1243 SdHoareTripleChecker+Valid, 1659 SdHoareTripleChecker+Invalid, 2702 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 447 IncrementalHoareTripleChecker+Valid, 2255 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2023-11-23 20:33:52,531 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1243 Valid, 1659 Invalid, 2702 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [447 Valid, 2255 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2023-11-23 20:33:52,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1710 states. [2023-11-23 20:33:52,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1710 to 1623. [2023-11-23 20:33:52,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1623 states, 1146 states have (on average 1.6055846422338569) internal successors, (1840), 1202 states have internal predecessors, (1840), 385 states have call successors, (385), 84 states have call predecessors, (385), 91 states have return successors, (412), 360 states have call predecessors, (412), 380 states have call successors, (412) [2023-11-23 20:33:52,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1623 states to 1623 states and 2637 transitions. [2023-11-23 20:33:52,727 INFO L78 Accepts]: Start accepts. Automaton has 1623 states and 2637 transitions. Word has length 99 [2023-11-23 20:33:52,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:33:52,729 INFO L495 AbstractCegarLoop]: Abstraction has 1623 states and 2637 transitions. [2023-11-23 20:33:52,730 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 7.571428571428571) internal successors, (53), 7 states have internal predecessors, (53), 5 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (18), 5 states have call predecessors, (18), 4 states have call successors, (18) [2023-11-23 20:33:52,730 INFO L276 IsEmpty]: Start isEmpty. Operand 1623 states and 2637 transitions. [2023-11-23 20:33:52,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2023-11-23 20:33:52,736 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:33:52,736 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:33:52,737 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-23 20:33:52,737 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:33:52,737 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:33:52,738 INFO L85 PathProgramCache]: Analyzing trace with hash 1740298854, now seen corresponding path program 1 times [2023-11-23 20:33:52,738 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:33:52,738 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1927069734] [2023-11-23 20:33:52,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:33:52,739 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:33:52,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:33:53,360 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-23 20:33:53,360 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:33:53,361 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1927069734] [2023-11-23 20:33:53,361 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1927069734] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:33:53,362 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:33:53,362 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-11-23 20:33:53,362 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1891510751] [2023-11-23 20:33:53,362 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:33:53,363 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-23 20:33:53,363 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:33:53,364 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-23 20:33:53,364 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2023-11-23 20:33:53,364 INFO L87 Difference]: Start difference. First operand 1623 states and 2637 transitions. Second operand has 8 states, 7 states have (on average 7.714285714285714) internal successors, (54), 7 states have internal predecessors, (54), 5 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (19), 5 states have call predecessors, (19), 4 states have call successors, (19) [2023-11-23 20:33:57,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:33:57,107 INFO L93 Difference]: Finished difference Result 4437 states and 7207 transitions. [2023-11-23 20:33:57,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2023-11-23 20:33:57,110 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 7.714285714285714) internal successors, (54), 7 states have internal predecessors, (54), 5 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (19), 5 states have call predecessors, (19), 4 states have call successors, (19) Word has length 102 [2023-11-23 20:33:57,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:33:57,133 INFO L225 Difference]: With dead ends: 4437 [2023-11-23 20:33:57,133 INFO L226 Difference]: Without dead ends: 2837 [2023-11-23 20:33:57,142 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=84, Invalid=336, Unknown=0, NotChecked=0, Total=420 [2023-11-23 20:33:57,143 INFO L413 NwaCegarLoop]: 550 mSDtfsCounter, 1368 mSDsluCounter, 1607 mSDsCounter, 0 mSdLazyCounter, 4076 mSolverCounterSat, 663 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1444 SdHoareTripleChecker+Valid, 2157 SdHoareTripleChecker+Invalid, 4739 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 663 IncrementalHoareTripleChecker+Valid, 4076 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2023-11-23 20:33:57,144 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1444 Valid, 2157 Invalid, 4739 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [663 Valid, 4076 Invalid, 0 Unknown, 0 Unchecked, 3.2s Time] [2023-11-23 20:33:57,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2837 states. [2023-11-23 20:33:57,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2837 to 2642. [2023-11-23 20:33:57,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2642 states, 1818 states have (on average 1.5792079207920793) internal successors, (2871), 1917 states have internal predecessors, (2871), 672 states have call successors, (672), 131 states have call predecessors, (672), 151 states have return successors, (719), 637 states have call predecessors, (719), 667 states have call successors, (719) [2023-11-23 20:33:57,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2642 states to 2642 states and 4262 transitions. [2023-11-23 20:33:57,404 INFO L78 Accepts]: Start accepts. Automaton has 2642 states and 4262 transitions. Word has length 102 [2023-11-23 20:33:57,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:33:57,404 INFO L495 AbstractCegarLoop]: Abstraction has 2642 states and 4262 transitions. [2023-11-23 20:33:57,404 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 7.714285714285714) internal successors, (54), 7 states have internal predecessors, (54), 5 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (19), 5 states have call predecessors, (19), 4 states have call successors, (19) [2023-11-23 20:33:57,405 INFO L276 IsEmpty]: Start isEmpty. Operand 2642 states and 4262 transitions. [2023-11-23 20:33:57,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2023-11-23 20:33:57,408 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:33:57,408 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:33:57,409 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-23 20:33:57,409 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:33:57,409 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:33:57,409 INFO L85 PathProgramCache]: Analyzing trace with hash -1738905189, now seen corresponding path program 1 times [2023-11-23 20:33:57,410 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:33:57,410 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1273380356] [2023-11-23 20:33:57,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:33:57,410 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:33:57,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:33:57,812 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-23 20:33:57,812 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:33:57,813 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1273380356] [2023-11-23 20:33:57,813 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1273380356] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:33:57,813 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:33:57,813 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-23 20:33:57,813 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [357933837] [2023-11-23 20:33:57,813 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:33:57,815 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-23 20:33:57,815 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:33:57,816 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-23 20:33:57,816 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:33:57,816 INFO L87 Difference]: Start difference. First operand 2642 states and 4262 transitions. Second operand has 6 states, 6 states have (on average 9.166666666666666) internal successors, (55), 6 states have internal predecessors, (55), 3 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (19), 3 states have call predecessors, (19), 2 states have call successors, (19) [2023-11-23 20:33:58,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:33:58,466 INFO L93 Difference]: Finished difference Result 2743 states and 4428 transitions. [2023-11-23 20:33:58,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-23 20:33:58,467 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.166666666666666) internal successors, (55), 6 states have internal predecessors, (55), 3 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (19), 3 states have call predecessors, (19), 2 states have call successors, (19) Word has length 103 [2023-11-23 20:33:58,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:33:58,490 INFO L225 Difference]: With dead ends: 2743 [2023-11-23 20:33:58,491 INFO L226 Difference]: Without dead ends: 2728 [2023-11-23 20:33:58,494 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2023-11-23 20:33:58,495 INFO L413 NwaCegarLoop]: 562 mSDtfsCounter, 697 mSDsluCounter, 936 mSDsCounter, 0 mSdLazyCounter, 317 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 698 SdHoareTripleChecker+Valid, 1498 SdHoareTripleChecker+Invalid, 339 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 317 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-23 20:33:58,496 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [698 Valid, 1498 Invalid, 339 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 317 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-23 20:33:58,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2728 states. [2023-11-23 20:33:58,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2728 to 2648. [2023-11-23 20:33:58,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2648 states, 1824 states have (on average 1.5773026315789473) internal successors, (2877), 1923 states have internal predecessors, (2877), 672 states have call successors, (672), 131 states have call predecessors, (672), 151 states have return successors, (719), 637 states have call predecessors, (719), 667 states have call successors, (719) [2023-11-23 20:33:58,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2648 states to 2648 states and 4268 transitions. [2023-11-23 20:33:58,776 INFO L78 Accepts]: Start accepts. Automaton has 2648 states and 4268 transitions. Word has length 103 [2023-11-23 20:33:58,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:33:58,777 INFO L495 AbstractCegarLoop]: Abstraction has 2648 states and 4268 transitions. [2023-11-23 20:33:58,777 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.166666666666666) internal successors, (55), 6 states have internal predecessors, (55), 3 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (19), 3 states have call predecessors, (19), 2 states have call successors, (19) [2023-11-23 20:33:58,777 INFO L276 IsEmpty]: Start isEmpty. Operand 2648 states and 4268 transitions. [2023-11-23 20:33:58,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2023-11-23 20:33:58,781 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:33:58,781 INFO L195 NwaCegarLoop]: trace histogram [3, 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] [2023-11-23 20:33:58,782 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-23 20:33:58,782 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:33:58,782 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:33:58,783 INFO L85 PathProgramCache]: Analyzing trace with hash -331124976, now seen corresponding path program 1 times [2023-11-23 20:33:58,783 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:33:58,783 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1457739538] [2023-11-23 20:33:58,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:33:58,784 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:33:58,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:33:59,669 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-23 20:33:59,669 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:33:59,669 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1457739538] [2023-11-23 20:33:59,670 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1457739538] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:33:59,670 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:33:59,670 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2023-11-23 20:33:59,671 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1529535456] [2023-11-23 20:33:59,671 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:33:59,671 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-23 20:33:59,672 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:33:59,673 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-23 20:33:59,673 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2023-11-23 20:33:59,674 INFO L87 Difference]: Start difference. First operand 2648 states and 4268 transitions. Second operand has 13 states, 11 states have (on average 5.2727272727272725) internal successors, (58), 11 states have internal predecessors, (58), 5 states have call successors, (21), 3 states have call predecessors, (21), 5 states have return successors, (20), 6 states have call predecessors, (20), 4 states have call successors, (20) [2023-11-23 20:34:06,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:34:06,098 INFO L93 Difference]: Finished difference Result 3073 states and 4910 transitions. [2023-11-23 20:34:06,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2023-11-23 20:34:06,099 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 11 states have (on average 5.2727272727272725) internal successors, (58), 11 states have internal predecessors, (58), 5 states have call successors, (21), 3 states have call predecessors, (21), 5 states have return successors, (20), 6 states have call predecessors, (20), 4 states have call successors, (20) Word has length 108 [2023-11-23 20:34:06,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:34:06,124 INFO L225 Difference]: With dead ends: 3073 [2023-11-23 20:34:06,124 INFO L226 Difference]: Without dead ends: 3056 [2023-11-23 20:34:06,128 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 713 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=375, Invalid=2277, Unknown=0, NotChecked=0, Total=2652 [2023-11-23 20:34:06,129 INFO L413 NwaCegarLoop]: 551 mSDtfsCounter, 2669 mSDsluCounter, 3402 mSDsCounter, 0 mSdLazyCounter, 8010 mSolverCounterSat, 1479 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2695 SdHoareTripleChecker+Valid, 3953 SdHoareTripleChecker+Invalid, 9489 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 1479 IncrementalHoareTripleChecker+Valid, 8010 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.4s IncrementalHoareTripleChecker+Time [2023-11-23 20:34:06,130 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2695 Valid, 3953 Invalid, 9489 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [1479 Valid, 8010 Invalid, 0 Unknown, 0 Unchecked, 5.4s Time] [2023-11-23 20:34:06,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3056 states. [2023-11-23 20:34:06,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3056 to 2836. [2023-11-23 20:34:06,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2836 states, 1966 states have (on average 1.5768056968463886) internal successors, (3100), 2063 states have internal predecessors, (3100), 689 states have call successors, (689), 161 states have call predecessors, (689), 180 states have return successors, (740), 655 states have call predecessors, (740), 684 states have call successors, (740) [2023-11-23 20:34:06,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2836 states to 2836 states and 4529 transitions. [2023-11-23 20:34:06,410 INFO L78 Accepts]: Start accepts. Automaton has 2836 states and 4529 transitions. Word has length 108 [2023-11-23 20:34:06,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:34:06,412 INFO L495 AbstractCegarLoop]: Abstraction has 2836 states and 4529 transitions. [2023-11-23 20:34:06,412 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 11 states have (on average 5.2727272727272725) internal successors, (58), 11 states have internal predecessors, (58), 5 states have call successors, (21), 3 states have call predecessors, (21), 5 states have return successors, (20), 6 states have call predecessors, (20), 4 states have call successors, (20) [2023-11-23 20:34:06,412 INFO L276 IsEmpty]: Start isEmpty. Operand 2836 states and 4529 transitions. [2023-11-23 20:34:06,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2023-11-23 20:34:06,416 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:34:06,417 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:34:06,417 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-23 20:34:06,417 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:34:06,418 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:34:06,418 INFO L85 PathProgramCache]: Analyzing trace with hash -1302570156, now seen corresponding path program 1 times [2023-11-23 20:34:06,418 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:34:06,418 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [359009302] [2023-11-23 20:34:06,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:06,419 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:34:06,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:09,894 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-11-23 20:34:09,894 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:34:09,894 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [359009302] [2023-11-23 20:34:09,895 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [359009302] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:34:09,895 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1485711916] [2023-11-23 20:34:09,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:09,895 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:34:09,895 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adf02789-be18-414d-a2f3-dee847575863/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:34:09,901 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adf02789-be18-414d-a2f3-dee847575863/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:34:09,936 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adf02789-be18-414d-a2f3-dee847575863/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 20:34:10,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:10,361 INFO L262 TraceCheckSpWp]: Trace formula consists of 2057 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-23 20:34:10,378 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:34:10,509 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-11-23 20:34:10,509 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 20:34:10,509 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1485711916] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:34:10,510 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 20:34:10,510 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [25] total 27 [2023-11-23 20:34:10,510 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [348861927] [2023-11-23 20:34:10,510 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:34:10,511 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-23 20:34:10,513 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:34:10,514 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-23 20:34:10,514 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=623, Unknown=0, NotChecked=0, Total=702 [2023-11-23 20:34:10,515 INFO L87 Difference]: Start difference. First operand 2836 states and 4529 transitions. Second operand has 4 states, 4 states have (on average 15.5) internal successors, (62), 4 states have internal predecessors, (62), 2 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (21), 2 states have call predecessors, (21), 1 states have call successors, (21) [2023-11-23 20:34:10,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:34:10,896 INFO L93 Difference]: Finished difference Result 2999 states and 4796 transitions. [2023-11-23 20:34:10,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-23 20:34:10,897 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 15.5) internal successors, (62), 4 states have internal predecessors, (62), 2 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (21), 2 states have call predecessors, (21), 1 states have call successors, (21) Word has length 115 [2023-11-23 20:34:10,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:34:10,918 INFO L225 Difference]: With dead ends: 2999 [2023-11-23 20:34:10,918 INFO L226 Difference]: Without dead ends: 2984 [2023-11-23 20:34:10,921 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=83, Invalid=673, Unknown=0, NotChecked=0, Total=756 [2023-11-23 20:34:10,926 INFO L413 NwaCegarLoop]: 604 mSDtfsCounter, 47 mSDsluCounter, 1160 mSDsCounter, 0 mSdLazyCounter, 114 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 1764 SdHoareTripleChecker+Invalid, 126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 114 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:34:10,926 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [54 Valid, 1764 Invalid, 126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 114 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:34:10,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2984 states. [2023-11-23 20:34:11,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2984 to 2850. [2023-11-23 20:34:11,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2850 states, 1980 states have (on average 1.5727272727272728) internal successors, (3114), 2077 states have internal predecessors, (3114), 689 states have call successors, (689), 161 states have call predecessors, (689), 180 states have return successors, (740), 655 states have call predecessors, (740), 684 states have call successors, (740) [2023-11-23 20:34:11,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2850 states to 2850 states and 4543 transitions. [2023-11-23 20:34:11,205 INFO L78 Accepts]: Start accepts. Automaton has 2850 states and 4543 transitions. Word has length 115 [2023-11-23 20:34:11,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:34:11,206 INFO L495 AbstractCegarLoop]: Abstraction has 2850 states and 4543 transitions. [2023-11-23 20:34:11,206 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 15.5) internal successors, (62), 4 states have internal predecessors, (62), 2 states have call successors, (22), 2 states have call predecessors, (22), 2 states have return successors, (21), 2 states have call predecessors, (21), 1 states have call successors, (21) [2023-11-23 20:34:11,206 INFO L276 IsEmpty]: Start isEmpty. Operand 2850 states and 4543 transitions. [2023-11-23 20:34:11,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2023-11-23 20:34:11,211 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:34:11,211 INFO L195 NwaCegarLoop]: trace histogram [7, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:34:11,240 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adf02789-be18-414d-a2f3-dee847575863/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 20:34:11,432 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adf02789-be18-414d-a2f3-dee847575863/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:34:11,432 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 20:34:11,432 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:34:11,433 INFO L85 PathProgramCache]: Analyzing trace with hash -567461039, now seen corresponding path program 1 times [2023-11-23 20:34:11,433 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:34:11,433 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [625424382] [2023-11-23 20:34:11,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:11,433 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:34:11,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:13,894 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2023-11-23 20:34:13,894 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:34:13,895 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [625424382] [2023-11-23 20:34:13,895 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [625424382] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:34:13,895 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [821971259] [2023-11-23 20:34:13,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:34:13,895 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:34:13,896 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adf02789-be18-414d-a2f3-dee847575863/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:34:13,900 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adf02789-be18-414d-a2f3-dee847575863/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:34:13,939 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_adf02789-be18-414d-a2f3-dee847575863/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 20:34:14,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:34:14,365 INFO L262 TraceCheckSpWp]: Trace formula consists of 2121 conjuncts, 36 conjunts are in the unsatisfiable core [2023-11-23 20:34:14,376 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:34:15,233 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 24 proven. 2 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-11-23 20:34:15,233 INFO L327 TraceCheckSpWp]: Computing backward predicates...