./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/product-lines/elevator_spec13_product31.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version cf1a7837 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_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/config/TaipanReach.xml -i ../../sv-benchmarks/c/product-lines/elevator_spec13_product31.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX --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 2e77838346608929bef5ad1e655ea0710d74ebb9f10b29169ab985d305812d92 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-cf1a783 [2023-11-12 00:56:44,631 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-12 00:56:44,792 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-12 00:56:44,800 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-12 00:56:44,801 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-12 00:56:44,857 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-12 00:56:44,858 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-12 00:56:44,859 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-12 00:56:44,860 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-12 00:56:44,865 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-12 00:56:44,866 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-12 00:56:44,866 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-12 00:56:44,867 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-12 00:56:44,868 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-12 00:56:44,869 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-12 00:56:44,869 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-12 00:56:44,870 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-12 00:56:44,870 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-12 00:56:44,871 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-12 00:56:44,871 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-12 00:56:44,872 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-12 00:56:44,872 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-12 00:56:44,873 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-12 00:56:44,874 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-12 00:56:44,874 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-12 00:56:44,874 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-12 00:56:44,875 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-12 00:56:44,875 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-12 00:56:44,876 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-12 00:56:44,876 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-12 00:56:44,877 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-12 00:56:44,877 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-12 00:56:44,877 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-12 00:56:44,878 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-12 00:56:44,878 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-12 00:56:44,878 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-12 00:56:44,878 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:56:44,879 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-12 00:56:44,879 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-12 00:56:44,879 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-12 00:56:44,879 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-12 00:56:44,880 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-12 00:56:44,880 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-12 00:56:44,880 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-12 00:56:44,880 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-12 00:56:44,881 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_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2e77838346608929bef5ad1e655ea0710d74ebb9f10b29169ab985d305812d92 [2023-11-12 00:56:45,192 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-12 00:56:45,252 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-12 00:56:45,257 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-12 00:56:45,259 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-12 00:56:45,260 INFO L274 PluginConnector]: CDTParser initialized [2023-11-12 00:56:45,263 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/../../sv-benchmarks/c/product-lines/elevator_spec13_product31.cil.c [2023-11-12 00:56:48,411 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-12 00:56:48,889 INFO L384 CDTParser]: Found 1 translation units. [2023-11-12 00:56:48,890 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/sv-benchmarks/c/product-lines/elevator_spec13_product31.cil.c [2023-11-12 00:56:48,917 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/data/435055566/a9c13b41776544379bbb6de0433b1b9a/FLAG53970358c [2023-11-12 00:56:48,934 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/data/435055566/a9c13b41776544379bbb6de0433b1b9a [2023-11-12 00:56:48,937 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-12 00:56:48,939 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-12 00:56:48,941 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-12 00:56:48,942 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-12 00:56:48,949 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-12 00:56:48,950 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:56:48" (1/1) ... [2023-11-12 00:56:48,952 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@14b7f71f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:56:48, skipping insertion in model container [2023-11-12 00:56:48,952 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:56:48" (1/1) ... [2023-11-12 00:56:49,044 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-12 00:56:49,249 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_cb779338-0133-4096-837f-093ad602fa57/sv-benchmarks/c/product-lines/elevator_spec13_product31.cil.c[1546,1559] [2023-11-12 00:56:49,674 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:56:49,687 INFO L202 MainTranslator]: Completed pre-run [2023-11-12 00:56:49,698 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"wsllib_check.i","") [48] [2023-11-12 00:56:49,700 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"libacc.i","") [57] [2023-11-12 00:56:49,700 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Specification13_spec.i","") [423] [2023-11-12 00:56:49,701 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Person.i","") [517] [2023-11-12 00:56:49,701 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Floor.i","") [638] [2023-11-12 00:56:49,701 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Test.i","") [1306] [2023-11-12 00:56:49,702 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"scenario.i","") [1664] [2023-11-12 00:56:49,702 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"featureselect.i","") [1679] [2023-11-12 00:56:49,702 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"Elevator.i","") [1714] [2023-11-12 00:56:49,702 WARN L75 lationResultReporter]: Unsoundness Warning: Ignoring preprocessor pragma C: #pragma merger(0,"UnitTests.i","") [3329] [2023-11-12 00:56:49,718 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_cb779338-0133-4096-837f-093ad602fa57/sv-benchmarks/c/product-lines/elevator_spec13_product31.cil.c[1546,1559] [2023-11-12 00:56:49,810 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:56:49,841 INFO L206 MainTranslator]: Completed translation [2023-11-12 00:56:49,842 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:56:49 WrapperNode [2023-11-12 00:56:49,842 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-12 00:56:49,843 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-12 00:56:49,844 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-12 00:56:49,844 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-12 00:56:49,851 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:56:49" (1/1) ... [2023-11-12 00:56:49,906 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:56:49" (1/1) ... [2023-11-12 00:56:49,985 INFO L138 Inliner]: procedures = 95, calls = 348, calls flagged for inlining = 28, calls inlined = 25, statements flattened = 916 [2023-11-12 00:56:49,985 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-12 00:56:49,986 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-12 00:56:49,986 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-12 00:56:49,986 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-12 00:56:50,012 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:56:49" (1/1) ... [2023-11-12 00:56:50,024 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:56:49" (1/1) ... [2023-11-12 00:56:50,033 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:56:49" (1/1) ... [2023-11-12 00:56:50,047 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:56:49" (1/1) ... [2023-11-12 00:56:50,099 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:56:49" (1/1) ... [2023-11-12 00:56:50,131 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:56:49" (1/1) ... [2023-11-12 00:56:50,137 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:56:49" (1/1) ... [2023-11-12 00:56:50,160 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:56:49" (1/1) ... [2023-11-12 00:56:50,171 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-12 00:56:50,188 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-12 00:56:50,188 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-12 00:56:50,189 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-12 00:56:50,189 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:56:49" (1/1) ... [2023-11-12 00:56:50,200 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:56:50,216 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:56:50,241 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-12 00:56:50,276 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-12 00:56:50,289 INFO L130 BoogieDeclarations]: Found specification of procedure angelinaCall [2023-11-12 00:56:50,290 INFO L138 BoogieDeclarations]: Found implementation of procedure angelinaCall [2023-11-12 00:56:50,290 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-12 00:56:50,290 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedAtCurrentFloor__wrappee__twothirdsfull [2023-11-12 00:56:50,290 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedAtCurrentFloor__wrappee__twothirdsfull [2023-11-12 00:56:50,291 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentHeading [2023-11-12 00:56:50,291 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentHeading [2023-11-12 00:56:50,291 INFO L130 BoogieDeclarations]: Found specification of procedure getWeight [2023-11-12 00:56:50,291 INFO L138 BoogieDeclarations]: Found implementation of procedure getWeight [2023-11-12 00:56:50,292 INFO L130 BoogieDeclarations]: Found specification of procedure existInLiftCallsInDirection [2023-11-12 00:56:50,292 INFO L138 BoogieDeclarations]: Found implementation of procedure existInLiftCallsInDirection [2023-11-12 00:56:50,292 INFO L130 BoogieDeclarations]: Found specification of procedure enterElevator [2023-11-12 00:56:50,293 INFO L138 BoogieDeclarations]: Found implementation of procedure enterElevator [2023-11-12 00:56:50,293 INFO L130 BoogieDeclarations]: Found specification of procedure isExecutiveFloorCalling [2023-11-12 00:56:50,294 INFO L138 BoogieDeclarations]: Found implementation of procedure isExecutiveFloorCalling [2023-11-12 00:56:50,295 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection [2023-11-12 00:56:50,295 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection [2023-11-12 00:56:50,295 INFO L130 BoogieDeclarations]: Found specification of procedure bobCall [2023-11-12 00:56:50,297 INFO L138 BoogieDeclarations]: Found implementation of procedure bobCall [2023-11-12 00:56:50,298 INFO L130 BoogieDeclarations]: Found specification of procedure getReverseHeading [2023-11-12 00:56:50,298 INFO L138 BoogieDeclarations]: Found implementation of procedure getReverseHeading [2023-11-12 00:56:50,298 INFO L130 BoogieDeclarations]: Found specification of procedure stopRequestedInDirection__wrappee__empty [2023-11-12 00:56:50,298 INFO L138 BoogieDeclarations]: Found implementation of procedure stopRequestedInDirection__wrappee__empty [2023-11-12 00:56:50,298 INFO L130 BoogieDeclarations]: Found specification of procedure cleanup [2023-11-12 00:56:50,299 INFO L138 BoogieDeclarations]: Found implementation of procedure cleanup [2023-11-12 00:56:50,299 INFO L130 BoogieDeclarations]: Found specification of procedure timeShift [2023-11-12 00:56:50,299 INFO L138 BoogieDeclarations]: Found implementation of procedure timeShift [2023-11-12 00:56:50,299 INFO L130 BoogieDeclarations]: Found specification of procedure __automaton_fail [2023-11-12 00:56:50,299 INFO L138 BoogieDeclarations]: Found implementation of procedure __automaton_fail [2023-11-12 00:56:50,299 INFO L130 BoogieDeclarations]: Found specification of procedure isTopFloor [2023-11-12 00:56:50,299 INFO L138 BoogieDeclarations]: Found implementation of procedure isTopFloor [2023-11-12 00:56:50,300 INFO L130 BoogieDeclarations]: Found specification of procedure getDestination [2023-11-12 00:56:50,300 INFO L138 BoogieDeclarations]: Found implementation of procedure getDestination [2023-11-12 00:56:50,300 INFO L130 BoogieDeclarations]: Found specification of procedure isBlocked [2023-11-12 00:56:50,300 INFO L138 BoogieDeclarations]: Found implementation of procedure isBlocked [2023-11-12 00:56:50,300 INFO L130 BoogieDeclarations]: Found specification of procedure getCurrentFloorID [2023-11-12 00:56:50,300 INFO L138 BoogieDeclarations]: Found implementation of procedure getCurrentFloorID [2023-11-12 00:56:50,301 INFO L130 BoogieDeclarations]: Found specification of procedure resetCallOnFloor [2023-11-12 00:56:50,301 INFO L138 BoogieDeclarations]: Found implementation of procedure resetCallOnFloor [2023-11-12 00:56:50,301 INFO L130 BoogieDeclarations]: Found specification of procedure initPersonOnFloor [2023-11-12 00:56:50,301 INFO L138 BoogieDeclarations]: Found implementation of procedure initPersonOnFloor [2023-11-12 00:56:50,301 INFO L130 BoogieDeclarations]: Found specification of procedure removePersonFromFloor [2023-11-12 00:56:50,301 INFO L138 BoogieDeclarations]: Found implementation of procedure removePersonFromFloor [2023-11-12 00:56:50,302 INFO L130 BoogieDeclarations]: Found specification of procedure getOrigin [2023-11-12 00:56:50,302 INFO L138 BoogieDeclarations]: Found implementation of procedure getOrigin [2023-11-12 00:56:50,302 INFO L130 BoogieDeclarations]: Found specification of procedure continueInDirection [2023-11-12 00:56:50,302 INFO L138 BoogieDeclarations]: Found implementation of procedure continueInDirection [2023-11-12 00:56:50,302 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-12 00:56:50,303 INFO L130 BoogieDeclarations]: Found specification of procedure buttonForFloorIsPressed [2023-11-12 00:56:50,303 INFO L138 BoogieDeclarations]: Found implementation of procedure buttonForFloorIsPressed [2023-11-12 00:56:50,303 INFO L130 BoogieDeclarations]: Found specification of procedure pressInLiftFloorButton [2023-11-12 00:56:50,304 INFO L138 BoogieDeclarations]: Found implementation of procedure pressInLiftFloorButton [2023-11-12 00:56:50,305 INFO L130 BoogieDeclarations]: Found specification of procedure leaveElevator [2023-11-12 00:56:50,305 INFO L138 BoogieDeclarations]: Found implementation of procedure leaveElevator [2023-11-12 00:56:50,305 INFO L130 BoogieDeclarations]: Found specification of procedure isPersonOnFloor [2023-11-12 00:56:50,306 INFO L138 BoogieDeclarations]: Found implementation of procedure isPersonOnFloor [2023-11-12 00:56:50,306 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-12 00:56:50,306 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-12 00:56:50,306 INFO L130 BoogieDeclarations]: Found specification of procedure isFloorCalling [2023-11-12 00:56:50,306 INFO L138 BoogieDeclarations]: Found implementation of procedure isFloorCalling [2023-11-12 00:56:50,476 INFO L236 CfgBuilder]: Building ICFG [2023-11-12 00:56:50,479 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-12 00:56:51,847 INFO L277 CfgBuilder]: Performing block encoding [2023-11-12 00:56:52,855 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-12 00:56:52,856 INFO L302 CfgBuilder]: Removed 4 assume(true) statements. [2023-11-12 00:56:52,860 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:56:52 BoogieIcfgContainer [2023-11-12 00:56:52,860 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-12 00:56:52,862 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-12 00:56:52,863 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-12 00:56:52,866 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-12 00:56:52,867 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 12:56:48" (1/3) ... [2023-11-12 00:56:52,867 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@e5cbefc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:56:52, skipping insertion in model container [2023-11-12 00:56:52,868 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:56:49" (2/3) ... [2023-11-12 00:56:52,868 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@e5cbefc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:56:52, skipping insertion in model container [2023-11-12 00:56:52,868 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:56:52" (3/3) ... [2023-11-12 00:56:52,870 INFO L112 eAbstractionObserver]: Analyzing ICFG elevator_spec13_product31.cil.c [2023-11-12 00:56:52,891 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-12 00:56:52,891 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-12 00:56:52,976 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-12 00:56:52,983 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;@47b3a2f7, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-12 00:56:52,983 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-12 00:56:52,990 INFO L276 IsEmpty]: Start isEmpty. Operand has 436 states, 298 states have (on average 1.5771812080536913) internal successors, (470), 316 states have internal predecessors, (470), 108 states have call successors, (108), 28 states have call predecessors, (108), 28 states have return successors, (108), 105 states have call predecessors, (108), 108 states have call successors, (108) [2023-11-12 00:56:53,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2023-11-12 00:56:53,020 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:56:53,021 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-11-12 00:56:53,022 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:56:53,027 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:56:53,028 INFO L85 PathProgramCache]: Analyzing trace with hash 269500351, now seen corresponding path program 1 times [2023-11-12 00:56:53,040 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:56:53,041 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [10942154] [2023-11-12 00:56:53,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:56:53,042 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:56:53,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:56:54,185 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2023-11-12 00:56:54,186 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:56:54,187 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [10942154] [2023-11-12 00:56:54,187 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [10942154] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:56:54,188 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [608643472] [2023-11-12 00:56:54,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:56:54,188 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:56:54,189 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:56:54,195 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:56:54,217 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-12 00:56:54,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:56:54,641 INFO L262 TraceCheckSpWp]: Trace formula consists of 1328 conjuncts, 13 conjunts are in the unsatisfiable core [2023-11-12 00:56:54,653 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:56:54,878 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-11-12 00:56:54,878 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 00:56:54,879 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [608643472] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:56:54,879 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 00:56:54,879 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 9 [2023-11-12 00:56:54,881 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [157529834] [2023-11-12 00:56:54,882 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:56:54,887 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-12 00:56:54,887 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:56:54,918 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-12 00:56:54,919 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2023-11-12 00:56:54,923 INFO L87 Difference]: Start difference. First operand has 436 states, 298 states have (on average 1.5771812080536913) internal successors, (470), 316 states have internal predecessors, (470), 108 states have call successors, (108), 28 states have call predecessors, (108), 28 states have return successors, (108), 105 states have call predecessors, (108), 108 states have call successors, (108) Second operand has 5 states, 5 states have (on average 9.8) internal successors, (49), 4 states have internal predecessors, (49), 2 states have call successors, (18), 3 states have call predecessors, (18), 3 states have return successors, (16), 2 states have call predecessors, (16), 2 states have call successors, (16) [2023-11-12 00:56:55,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:56:55,887 INFO L93 Difference]: Finished difference Result 1276 states and 2046 transitions. [2023-11-12 00:56:55,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-12 00:56:55,890 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 9.8) internal successors, (49), 4 states have internal predecessors, (49), 2 states have call successors, (18), 3 states have call predecessors, (18), 3 states have return successors, (16), 2 states have call predecessors, (16), 2 states have call successors, (16) Word has length 96 [2023-11-12 00:56:55,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:56:55,911 INFO L225 Difference]: With dead ends: 1276 [2023-11-12 00:56:55,911 INFO L226 Difference]: Without dead ends: 845 [2023-11-12 00:56:55,920 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2023-11-12 00:56:55,924 INFO L413 NwaCegarLoop]: 799 mSDtfsCounter, 618 mSDsluCounter, 2002 mSDsCounter, 0 mSdLazyCounter, 425 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 618 SdHoareTripleChecker+Valid, 2801 SdHoareTripleChecker+Invalid, 438 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 425 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-11-12 00:56:55,925 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [618 Valid, 2801 Invalid, 438 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 425 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-11-12 00:56:55,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 845 states. [2023-11-12 00:56:56,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 845 to 837. [2023-11-12 00:56:56,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 837 states, 579 states have (on average 1.5613126079447324) internal successors, (904), 609 states have internal predecessors, (904), 206 states have call successors, (206), 54 states have call predecessors, (206), 51 states have return successors, (210), 198 states have call predecessors, (210), 202 states have call successors, (210) [2023-11-12 00:56:56,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 837 states to 837 states and 1320 transitions. [2023-11-12 00:56:56,055 INFO L78 Accepts]: Start accepts. Automaton has 837 states and 1320 transitions. Word has length 96 [2023-11-12 00:56:56,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:56:56,056 INFO L495 AbstractCegarLoop]: Abstraction has 837 states and 1320 transitions. [2023-11-12 00:56:56,056 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 9.8) internal successors, (49), 4 states have internal predecessors, (49), 2 states have call successors, (18), 3 states have call predecessors, (18), 3 states have return successors, (16), 2 states have call predecessors, (16), 2 states have call successors, (16) [2023-11-12 00:56:56,057 INFO L276 IsEmpty]: Start isEmpty. Operand 837 states and 1320 transitions. [2023-11-12 00:56:56,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2023-11-12 00:56:56,064 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:56:56,065 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-11-12 00:56:56,073 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-12 00:56:56,273 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-11-12 00:56:56,273 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:56:56,274 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:56:56,274 INFO L85 PathProgramCache]: Analyzing trace with hash -2055339779, now seen corresponding path program 1 times [2023-11-12 00:56:56,274 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:56:56,274 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [797366139] [2023-11-12 00:56:56,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:56:56,275 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:56:56,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:56:56,561 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-12 00:56:56,561 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:56:56,561 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [797366139] [2023-11-12 00:56:56,562 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [797366139] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:56:56,562 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [964823508] [2023-11-12 00:56:56,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:56:56,562 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:56:56,563 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:56:56,564 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:56:56,589 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-12 00:56:56,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:56:56,974 INFO L262 TraceCheckSpWp]: Trace formula consists of 1345 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-12 00:56:56,981 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:56:57,001 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-12 00:56:57,001 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 00:56:57,001 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [964823508] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:56:57,001 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 00:56:57,001 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 4 [2023-11-12 00:56:57,002 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [446057691] [2023-11-12 00:56:57,002 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:56:57,003 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 00:56:57,003 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:56:57,005 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 00:56:57,006 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:56:57,006 INFO L87 Difference]: Start difference. First operand 837 states and 1320 transitions. Second operand has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2023-11-12 00:56:57,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:56:57,235 INFO L93 Difference]: Finished difference Result 1671 states and 2655 transitions. [2023-11-12 00:56:57,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-12 00:56:57,236 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) Word has length 100 [2023-11-12 00:56:57,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:56:57,244 INFO L225 Difference]: With dead ends: 1671 [2023-11-12 00:56:57,244 INFO L226 Difference]: Without dead ends: 849 [2023-11-12 00:56:57,250 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:56:57,252 INFO L413 NwaCegarLoop]: 626 mSDtfsCounter, 85 mSDsluCounter, 1165 mSDsCounter, 0 mSdLazyCounter, 139 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 1791 SdHoareTripleChecker+Invalid, 144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 139 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 00:56:57,252 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [85 Valid, 1791 Invalid, 144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 139 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 00:56:57,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 849 states. [2023-11-12 00:56:57,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 849 to 849. [2023-11-12 00:56:57,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 849 states, 589 states have (on average 1.5551782682512734) internal successors, (916), 619 states have internal predecessors, (916), 206 states have call successors, (206), 56 states have call predecessors, (206), 53 states have return successors, (210), 198 states have call predecessors, (210), 202 states have call successors, (210) [2023-11-12 00:56:57,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 849 states to 849 states and 1332 transitions. [2023-11-12 00:56:57,329 INFO L78 Accepts]: Start accepts. Automaton has 849 states and 1332 transitions. Word has length 100 [2023-11-12 00:56:57,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:56:57,332 INFO L495 AbstractCegarLoop]: Abstraction has 849 states and 1332 transitions. [2023-11-12 00:56:57,333 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.0) internal successors, (56), 4 states have internal predecessors, (56), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2023-11-12 00:56:57,333 INFO L276 IsEmpty]: Start isEmpty. Operand 849 states and 1332 transitions. [2023-11-12 00:56:57,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2023-11-12 00:56:57,339 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:56:57,339 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-11-12 00:56:57,352 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-12 00:56:57,547 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:56:57,548 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:56:57,548 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:56:57,548 INFO L85 PathProgramCache]: Analyzing trace with hash -925341452, now seen corresponding path program 1 times [2023-11-12 00:56:57,548 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:56:57,549 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [175606069] [2023-11-12 00:56:57,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:56:57,549 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:56:57,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:56:57,908 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-11-12 00:56:57,908 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:56:57,909 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [175606069] [2023-11-12 00:56:57,909 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [175606069] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:56:57,909 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [925258847] [2023-11-12 00:56:57,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:56:57,909 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:56:57,910 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:56:57,911 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:56:57,933 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-12 00:56:58,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:56:58,281 INFO L262 TraceCheckSpWp]: Trace formula consists of 1350 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-12 00:56:58,286 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:56:58,337 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-11-12 00:56:58,337 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 00:56:58,337 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [925258847] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:56:58,337 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 00:56:58,338 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 7 [2023-11-12 00:56:58,338 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [571502317] [2023-11-12 00:56:58,338 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:56:58,339 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 00:56:58,339 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:56:58,340 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 00:56:58,340 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2023-11-12 00:56:58,340 INFO L87 Difference]: Start difference. First operand 849 states and 1332 transitions. Second operand has 4 states, 4 states have (on average 14.5) internal successors, (58), 4 states have internal predecessors, (58), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2023-11-12 00:56:58,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:56:58,583 INFO L93 Difference]: Finished difference Result 1689 states and 2665 transitions. [2023-11-12 00:56:58,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-12 00:56:58,584 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.5) internal successors, (58), 4 states have internal predecessors, (58), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) Word has length 102 [2023-11-12 00:56:58,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:56:58,592 INFO L225 Difference]: With dead ends: 1689 [2023-11-12 00:56:58,592 INFO L226 Difference]: Without dead ends: 847 [2023-11-12 00:56:58,598 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2023-11-12 00:56:58,599 INFO L413 NwaCegarLoop]: 625 mSDtfsCounter, 91 mSDsluCounter, 1162 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 1787 SdHoareTripleChecker+Invalid, 138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 00:56:58,600 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [91 Valid, 1787 Invalid, 138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 134 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 00:56:58,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 847 states. [2023-11-12 00:56:58,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 847 to 847. [2023-11-12 00:56:58,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 847 states, 587 states have (on average 1.546848381601363) internal successors, (908), 617 states have internal predecessors, (908), 206 states have call successors, (206), 56 states have call predecessors, (206), 53 states have return successors, (210), 198 states have call predecessors, (210), 202 states have call successors, (210) [2023-11-12 00:56:58,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 847 states to 847 states and 1324 transitions. [2023-11-12 00:56:58,653 INFO L78 Accepts]: Start accepts. Automaton has 847 states and 1324 transitions. Word has length 102 [2023-11-12 00:56:58,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:56:58,654 INFO L495 AbstractCegarLoop]: Abstraction has 847 states and 1324 transitions. [2023-11-12 00:56:58,654 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.5) internal successors, (58), 4 states have internal predecessors, (58), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2023-11-12 00:56:58,654 INFO L276 IsEmpty]: Start isEmpty. Operand 847 states and 1324 transitions. [2023-11-12 00:56:58,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2023-11-12 00:56:58,658 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:56:58,658 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:56:58,669 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-12 00:56:58,867 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:56:58,867 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:56:58,868 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:56:58,868 INFO L85 PathProgramCache]: Analyzing trace with hash -728605954, now seen corresponding path program 1 times [2023-11-12 00:56:58,868 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:56:58,871 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [281565160] [2023-11-12 00:56:58,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:56:58,871 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:56:58,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:56:59,267 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-11-12 00:56:59,271 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:56:59,272 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [281565160] [2023-11-12 00:56:59,272 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [281565160] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:56:59,272 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1873331869] [2023-11-12 00:56:59,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:56:59,273 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:56:59,273 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:56:59,274 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:56:59,295 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-12 00:56:59,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:56:59,643 INFO L262 TraceCheckSpWp]: Trace formula consists of 1354 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-12 00:56:59,648 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:56:59,726 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-12 00:56:59,726 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 00:56:59,726 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1873331869] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:56:59,726 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 00:56:59,727 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 8 [2023-11-12 00:56:59,727 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [352081539] [2023-11-12 00:56:59,727 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:56:59,728 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-12 00:56:59,728 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:56:59,729 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-12 00:56:59,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2023-11-12 00:56:59,730 INFO L87 Difference]: Start difference. First operand 847 states and 1324 transitions. Second operand has 5 states, 5 states have (on average 11.8) internal successors, (59), 5 states have internal predecessors, (59), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2023-11-12 00:57:00,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:57:00,975 INFO L93 Difference]: Finished difference Result 2071 states and 3280 transitions. [2023-11-12 00:57:00,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-12 00:57:00,976 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.8) internal successors, (59), 5 states have internal predecessors, (59), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) Word has length 103 [2023-11-12 00:57:00,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:57:00,988 INFO L225 Difference]: With dead ends: 2071 [2023-11-12 00:57:00,989 INFO L226 Difference]: Without dead ends: 1239 [2023-11-12 00:57:00,997 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2023-11-12 00:57:01,000 INFO L413 NwaCegarLoop]: 693 mSDtfsCounter, 638 mSDsluCounter, 1427 mSDsCounter, 0 mSdLazyCounter, 903 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 640 SdHoareTripleChecker+Valid, 2120 SdHoareTripleChecker+Invalid, 934 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 903 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:57:01,001 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [640 Valid, 2120 Invalid, 934 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 903 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2023-11-12 00:57:01,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1239 states. [2023-11-12 00:57:01,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1239 to 1219. [2023-11-12 00:57:01,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1219 states, 844 states have (on average 1.4928909952606635) internal successors, (1260), 889 states have internal predecessors, (1260), 294 states have call successors, (294), 84 states have call predecessors, (294), 80 states have return successors, (322), 282 states have call predecessors, (322), 289 states have call successors, (322) [2023-11-12 00:57:01,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1219 states to 1219 states and 1876 transitions. [2023-11-12 00:57:01,095 INFO L78 Accepts]: Start accepts. Automaton has 1219 states and 1876 transitions. Word has length 103 [2023-11-12 00:57:01,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:57:01,096 INFO L495 AbstractCegarLoop]: Abstraction has 1219 states and 1876 transitions. [2023-11-12 00:57:01,096 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.8) internal successors, (59), 5 states have internal predecessors, (59), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2023-11-12 00:57:01,096 INFO L276 IsEmpty]: Start isEmpty. Operand 1219 states and 1876 transitions. [2023-11-12 00:57:01,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2023-11-12 00:57:01,103 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:57:01,103 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-11-12 00:57:01,116 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-12 00:57:01,311 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:57:01,312 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:57:01,312 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:57:01,312 INFO L85 PathProgramCache]: Analyzing trace with hash -2082882485, now seen corresponding path program 1 times [2023-11-12 00:57:01,312 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:57:01,313 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [263774338] [2023-11-12 00:57:01,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:57:01,313 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:57:01,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:57:01,709 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-11-12 00:57:01,709 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:57:01,709 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [263774338] [2023-11-12 00:57:01,710 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [263774338] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:57:01,710 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1579460767] [2023-11-12 00:57:01,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:57:01,710 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:57:01,710 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:57:01,712 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:57:01,715 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-12 00:57:02,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:57:02,093 INFO L262 TraceCheckSpWp]: Trace formula consists of 1355 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-12 00:57:02,099 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:57:02,269 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-11-12 00:57:02,269 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 00:57:02,269 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1579460767] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:57:02,270 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 00:57:02,270 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [8] total 12 [2023-11-12 00:57:02,270 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [602244583] [2023-11-12 00:57:02,270 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:57:02,271 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-12 00:57:02,271 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:57:02,272 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-12 00:57:02,274 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2023-11-12 00:57:02,275 INFO L87 Difference]: Start difference. First operand 1219 states and 1876 transitions. Second operand has 6 states, 5 states have (on average 11.4) internal successors, (57), 4 states have internal predecessors, (57), 3 states have call successors, (19), 3 states have call predecessors, (19), 4 states have return successors, (17), 4 states have call predecessors, (17), 3 states have call successors, (17) [2023-11-12 00:57:03,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:57:03,383 INFO L93 Difference]: Finished difference Result 2650 states and 4075 transitions. [2023-11-12 00:57:03,384 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-12 00:57:03,384 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 11.4) internal successors, (57), 4 states have internal predecessors, (57), 3 states have call successors, (19), 3 states have call predecessors, (19), 4 states have return successors, (17), 4 states have call predecessors, (17), 3 states have call successors, (17) Word has length 104 [2023-11-12 00:57:03,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:57:03,396 INFO L225 Difference]: With dead ends: 2650 [2023-11-12 00:57:03,396 INFO L226 Difference]: Without dead ends: 1446 [2023-11-12 00:57:03,405 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2023-11-12 00:57:03,406 INFO L413 NwaCegarLoop]: 831 mSDtfsCounter, 771 mSDsluCounter, 2739 mSDsCounter, 0 mSdLazyCounter, 507 mSolverCounterSat, 313 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 772 SdHoareTripleChecker+Valid, 3570 SdHoareTripleChecker+Invalid, 820 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 313 IncrementalHoareTripleChecker+Valid, 507 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-11-12 00:57:03,406 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [772 Valid, 3570 Invalid, 820 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [313 Valid, 507 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-11-12 00:57:03,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1446 states. [2023-11-12 00:57:03,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1446 to 1427. [2023-11-12 00:57:03,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1427 states, 1005 states have (on average 1.4796019900497512) internal successors, (1487), 1048 states have internal predecessors, (1487), 318 states have call successors, (318), 108 states have call predecessors, (318), 103 states have return successors, (373), 307 states have call predecessors, (373), 311 states have call successors, (373) [2023-11-12 00:57:03,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1427 states to 1427 states and 2178 transitions. [2023-11-12 00:57:03,497 INFO L78 Accepts]: Start accepts. Automaton has 1427 states and 2178 transitions. Word has length 104 [2023-11-12 00:57:03,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:57:03,498 INFO L495 AbstractCegarLoop]: Abstraction has 1427 states and 2178 transitions. [2023-11-12 00:57:03,498 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 11.4) internal successors, (57), 4 states have internal predecessors, (57), 3 states have call successors, (19), 3 states have call predecessors, (19), 4 states have return successors, (17), 4 states have call predecessors, (17), 3 states have call successors, (17) [2023-11-12 00:57:03,498 INFO L276 IsEmpty]: Start isEmpty. Operand 1427 states and 2178 transitions. [2023-11-12 00:57:03,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2023-11-12 00:57:03,521 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:57:03,522 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-11-12 00:57:03,537 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-12 00:57:03,729 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:57:03,730 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:57:03,731 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:57:03,731 INFO L85 PathProgramCache]: Analyzing trace with hash 1378464279, now seen corresponding path program 1 times [2023-11-12 00:57:03,731 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:57:03,731 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [186804632] [2023-11-12 00:57:03,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:57:03,732 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:57:03,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:57:04,012 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-12 00:57:04,012 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:57:04,012 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [186804632] [2023-11-12 00:57:04,012 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [186804632] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:57:04,013 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [698445194] [2023-11-12 00:57:04,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:57:04,013 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:57:04,013 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:57:04,014 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:57:04,036 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-12 00:57:04,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:57:04,362 INFO L262 TraceCheckSpWp]: Trace formula consists of 1357 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-12 00:57:04,366 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:57:04,400 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-12 00:57:04,403 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 00:57:04,404 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [698445194] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:57:04,404 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 00:57:04,404 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 8 [2023-11-12 00:57:04,404 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1294327263] [2023-11-12 00:57:04,404 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:57:04,405 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-12 00:57:04,405 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:57:04,406 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-12 00:57:04,406 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2023-11-12 00:57:04,408 INFO L87 Difference]: Start difference. First operand 1427 states and 2178 transitions. Second operand has 5 states, 5 states have (on average 11.8) internal successors, (59), 4 states have internal predecessors, (59), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 2 states have call successors, (17) [2023-11-12 00:57:04,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:57:04,651 INFO L93 Difference]: Finished difference Result 2860 states and 4403 transitions. [2023-11-12 00:57:04,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-12 00:57:04,652 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.8) internal successors, (59), 4 states have internal predecessors, (59), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 2 states have call successors, (17) Word has length 104 [2023-11-12 00:57:04,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:57:04,671 INFO L225 Difference]: With dead ends: 2860 [2023-11-12 00:57:04,671 INFO L226 Difference]: Without dead ends: 1456 [2023-11-12 00:57:04,684 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 102 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2023-11-12 00:57:04,685 INFO L413 NwaCegarLoop]: 635 mSDtfsCounter, 1 mSDsluCounter, 1890 mSDsCounter, 0 mSdLazyCounter, 164 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 2525 SdHoareTripleChecker+Invalid, 173 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 164 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:57:04,686 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 2525 Invalid, 173 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 164 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:57:04,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1456 states. [2023-11-12 00:57:04,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1456 to 1439. [2023-11-12 00:57:04,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1439 states, 1014 states have (on average 1.47534516765286) internal successors, (1496), 1057 states have internal predecessors, (1496), 318 states have call successors, (318), 108 states have call predecessors, (318), 106 states have return successors, (376), 310 states have call predecessors, (376), 311 states have call successors, (376) [2023-11-12 00:57:04,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1439 states to 1439 states and 2190 transitions. [2023-11-12 00:57:04,835 INFO L78 Accepts]: Start accepts. Automaton has 1439 states and 2190 transitions. Word has length 104 [2023-11-12 00:57:04,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:57:04,837 INFO L495 AbstractCegarLoop]: Abstraction has 1439 states and 2190 transitions. [2023-11-12 00:57:04,837 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.8) internal successors, (59), 4 states have internal predecessors, (59), 2 states have call successors, (19), 2 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 2 states have call successors, (17) [2023-11-12 00:57:04,838 INFO L276 IsEmpty]: Start isEmpty. Operand 1439 states and 2190 transitions. [2023-11-12 00:57:04,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2023-11-12 00:57:04,844 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:57:04,844 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-11-12 00:57:04,861 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-12 00:57:05,053 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:57:05,053 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:57:05,053 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:57:05,054 INFO L85 PathProgramCache]: Analyzing trace with hash -1341364136, now seen corresponding path program 1 times [2023-11-12 00:57:05,054 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:57:05,054 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1846719399] [2023-11-12 00:57:05,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:57:05,055 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:57:05,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:57:05,334 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-12 00:57:05,334 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:57:05,334 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1846719399] [2023-11-12 00:57:05,335 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1846719399] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:57:05,335 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [414222013] [2023-11-12 00:57:05,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:57:05,335 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:57:05,335 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:57:05,336 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:57:05,341 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-12 00:57:05,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:57:05,683 INFO L262 TraceCheckSpWp]: Trace formula consists of 1361 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-12 00:57:05,688 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:57:05,731 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-12 00:57:05,731 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 00:57:05,732 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [414222013] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:57:05,732 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 00:57:05,732 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 6 [2023-11-12 00:57:05,732 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1051382610] [2023-11-12 00:57:05,732 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:57:05,733 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 00:57:05,733 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:57:05,733 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 00:57:05,733 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-12 00:57:05,734 INFO L87 Difference]: Start difference. First operand 1439 states and 2190 transitions. Second operand has 4 states, 4 states have (on average 15.25) internal successors, (61), 4 states have internal predecessors, (61), 2 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2023-11-12 00:57:06,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:57:06,097 INFO L93 Difference]: Finished difference Result 2929 states and 4525 transitions. [2023-11-12 00:57:06,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 00:57:06,098 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 15.25) internal successors, (61), 4 states have internal predecessors, (61), 2 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) Word has length 106 [2023-11-12 00:57:06,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:57:06,111 INFO L225 Difference]: With dead ends: 2929 [2023-11-12 00:57:06,111 INFO L226 Difference]: Without dead ends: 1514 [2023-11-12 00:57:06,123 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-12 00:57:06,124 INFO L413 NwaCegarLoop]: 623 mSDtfsCounter, 19 mSDsluCounter, 1116 mSDsCounter, 0 mSdLazyCounter, 277 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 1739 SdHoareTripleChecker+Invalid, 279 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 277 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-12 00:57:06,124 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 1739 Invalid, 279 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 277 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-12 00:57:06,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1514 states. [2023-11-12 00:57:06,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1514 to 1496. [2023-11-12 00:57:06,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1496 states, 1071 states have (on average 1.4836601307189543) internal successors, (1589), 1114 states have internal predecessors, (1589), 318 states have call successors, (318), 108 states have call predecessors, (318), 106 states have return successors, (376), 310 states have call predecessors, (376), 311 states have call successors, (376) [2023-11-12 00:57:06,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1496 states to 1496 states and 2283 transitions. [2023-11-12 00:57:06,248 INFO L78 Accepts]: Start accepts. Automaton has 1496 states and 2283 transitions. Word has length 106 [2023-11-12 00:57:06,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:57:06,248 INFO L495 AbstractCegarLoop]: Abstraction has 1496 states and 2283 transitions. [2023-11-12 00:57:06,248 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 15.25) internal successors, (61), 4 states have internal predecessors, (61), 2 states have call successors, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2023-11-12 00:57:06,249 INFO L276 IsEmpty]: Start isEmpty. Operand 1496 states and 2283 transitions. [2023-11-12 00:57:06,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2023-11-12 00:57:06,253 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:57:06,254 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:57:06,267 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-11-12 00:57:06,467 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:57:06,467 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:57:06,468 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:57:06,468 INFO L85 PathProgramCache]: Analyzing trace with hash 970084142, now seen corresponding path program 1 times [2023-11-12 00:57:06,468 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:57:06,468 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1330407358] [2023-11-12 00:57:06,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:57:06,468 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:57:06,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:57:06,711 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-12 00:57:06,711 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:57:06,711 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1330407358] [2023-11-12 00:57:06,711 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1330407358] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:57:06,712 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [999085348] [2023-11-12 00:57:06,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:57:06,712 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:57:06,712 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:57:06,713 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:57:06,732 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-12 00:57:07,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:57:07,059 INFO L262 TraceCheckSpWp]: Trace formula consists of 1363 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-12 00:57:07,063 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:57:07,119 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-12 00:57:07,119 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 00:57:07,119 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [999085348] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:57:07,119 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 00:57:07,119 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [4] total 7 [2023-11-12 00:57:07,121 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1571679601] [2023-11-12 00:57:07,122 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:57:07,122 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-12 00:57:07,122 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:57:07,123 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-12 00:57:07,123 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-12 00:57:07,123 INFO L87 Difference]: Start difference. First operand 1496 states and 2283 transitions. Second operand has 5 states, 5 states have (on average 12.8) internal successors, (64), 5 states have internal predecessors, (64), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2023-11-12 00:57:08,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:57:08,336 INFO L93 Difference]: Finished difference Result 3578 states and 5662 transitions. [2023-11-12 00:57:08,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-12 00:57:08,336 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 12.8) internal successors, (64), 5 states have internal predecessors, (64), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) Word has length 108 [2023-11-12 00:57:08,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:57:08,355 INFO L225 Difference]: With dead ends: 3578 [2023-11-12 00:57:08,355 INFO L226 Difference]: Without dead ends: 2519 [2023-11-12 00:57:08,366 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2023-11-12 00:57:08,368 INFO L413 NwaCegarLoop]: 724 mSDtfsCounter, 660 mSDsluCounter, 1298 mSDsCounter, 0 mSdLazyCounter, 865 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 662 SdHoareTripleChecker+Valid, 2022 SdHoareTripleChecker+Invalid, 895 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 865 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:57:08,368 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [662 Valid, 2022 Invalid, 895 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 865 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2023-11-12 00:57:08,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2519 states. [2023-11-12 00:57:08,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2519 to 2466. [2023-11-12 00:57:08,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2466 states, 1767 states have (on average 1.4770797962648556) internal successors, (2610), 1836 states have internal predecessors, (2610), 520 states have call successors, (520), 180 states have call predecessors, (520), 178 states have return successors, (737), 510 states have call predecessors, (737), 509 states have call successors, (737) [2023-11-12 00:57:08,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2466 states to 2466 states and 3867 transitions. [2023-11-12 00:57:08,553 INFO L78 Accepts]: Start accepts. Automaton has 2466 states and 3867 transitions. Word has length 108 [2023-11-12 00:57:08,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:57:08,554 INFO L495 AbstractCegarLoop]: Abstraction has 2466 states and 3867 transitions. [2023-11-12 00:57:08,554 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 12.8) internal successors, (64), 5 states have internal predecessors, (64), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2023-11-12 00:57:08,554 INFO L276 IsEmpty]: Start isEmpty. Operand 2466 states and 3867 transitions. [2023-11-12 00:57:08,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2023-11-12 00:57:08,558 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:57:08,558 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-11-12 00:57:08,571 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-12 00:57:08,766 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:57:08,767 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:57:08,767 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:57:08,767 INFO L85 PathProgramCache]: Analyzing trace with hash -1295220968, now seen corresponding path program 1 times [2023-11-12 00:57:08,768 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:57:08,768 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1239322414] [2023-11-12 00:57:08,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:57:08,768 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:57:08,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:57:08,996 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-12 00:57:08,996 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:57:08,996 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1239322414] [2023-11-12 00:57:08,997 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1239322414] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:57:08,997 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [292310276] [2023-11-12 00:57:08,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:57:08,997 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:57:08,997 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:57:08,998 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:57:09,006 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-12 00:57:09,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:57:09,341 INFO L262 TraceCheckSpWp]: Trace formula consists of 1362 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-12 00:57:09,345 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:57:09,358 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-12 00:57:09,358 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 00:57:09,358 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [292310276] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:57:09,358 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 00:57:09,358 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4] total 4 [2023-11-12 00:57:09,359 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1784984317] [2023-11-12 00:57:09,359 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:57:09,359 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 00:57:09,359 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:57:09,360 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 00:57:09,360 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:57:09,360 INFO L87 Difference]: Start difference. First operand 2466 states and 3867 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, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2023-11-12 00:57:09,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:57:09,662 INFO L93 Difference]: Finished difference Result 4972 states and 7958 transitions. [2023-11-12 00:57:09,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 00:57:09,662 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, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) Word has length 108 [2023-11-12 00:57:09,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:57:09,682 INFO L225 Difference]: With dead ends: 4972 [2023-11-12 00:57:09,683 INFO L226 Difference]: Without dead ends: 2530 [2023-11-12 00:57:09,707 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:57:09,710 INFO L413 NwaCegarLoop]: 637 mSDtfsCounter, 5 mSDsluCounter, 620 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 1257 SdHoareTripleChecker+Invalid, 99 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:57:09,710 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 1257 Invalid, 99 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 95 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:57:09,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2530 states. [2023-11-12 00:57:09,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2530 to 2476. [2023-11-12 00:57:09,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2476 states, 1777 states have (on average 1.4642656162070906) internal successors, (2602), 1846 states have internal predecessors, (2602), 520 states have call successors, (520), 180 states have call predecessors, (520), 178 states have return successors, (737), 510 states have call predecessors, (737), 509 states have call successors, (737) [2023-11-12 00:57:09,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2476 states to 2476 states and 3859 transitions. [2023-11-12 00:57:09,898 INFO L78 Accepts]: Start accepts. Automaton has 2476 states and 3859 transitions. Word has length 108 [2023-11-12 00:57:09,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:57:09,900 INFO L495 AbstractCegarLoop]: Abstraction has 2476 states and 3859 transitions. [2023-11-12 00:57:09,900 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, (19), 2 states have call predecessors, (19), 2 states have return successors, (17), 2 states have call predecessors, (17), 2 states have call successors, (17) [2023-11-12 00:57:09,901 INFO L276 IsEmpty]: Start isEmpty. Operand 2476 states and 3859 transitions. [2023-11-12 00:57:09,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2023-11-12 00:57:09,904 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:57:09,905 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-11-12 00:57:09,916 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-11-12 00:57:10,112 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:57:10,112 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:57:10,113 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:57:10,113 INFO L85 PathProgramCache]: Analyzing trace with hash 1673155987, now seen corresponding path program 1 times [2023-11-12 00:57:10,113 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:57:10,113 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1607099019] [2023-11-12 00:57:10,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:57:10,114 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:57:10,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:57:10,304 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-12 00:57:10,305 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:57:10,305 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1607099019] [2023-11-12 00:57:10,305 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1607099019] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:57:10,305 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1106317999] [2023-11-12 00:57:10,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:57:10,305 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:57:10,306 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:57:10,306 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:57:10,343 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-12 00:57:10,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:57:10,666 INFO L262 TraceCheckSpWp]: Trace formula consists of 1364 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-12 00:57:10,670 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:57:10,720 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-12 00:57:10,720 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 00:57:10,720 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1106317999] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:57:10,720 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 00:57:10,721 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [4] total 7 [2023-11-12 00:57:10,721 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1859978971] [2023-11-12 00:57:10,721 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:57:10,721 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-12 00:57:10,721 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:57:10,722 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-12 00:57:10,722 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-12 00:57:10,722 INFO L87 Difference]: Start difference. First operand 2476 states and 3859 transitions. Second operand has 5 states, 5 states have (on average 13.0) internal successors, (65), 5 states have internal predecessors, (65), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2023-11-12 00:57:12,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:57:12,000 INFO L93 Difference]: Finished difference Result 5527 states and 8868 transitions. [2023-11-12 00:57:12,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-12 00:57:12,001 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 13.0) internal successors, (65), 5 states have internal predecessors, (65), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) Word has length 109 [2023-11-12 00:57:12,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:57:12,031 INFO L225 Difference]: With dead ends: 5527 [2023-11-12 00:57:12,032 INFO L226 Difference]: Without dead ends: 3493 [2023-11-12 00:57:12,049 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2023-11-12 00:57:12,050 INFO L413 NwaCegarLoop]: 729 mSDtfsCounter, 679 mSDsluCounter, 1298 mSDsCounter, 0 mSdLazyCounter, 879 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 681 SdHoareTripleChecker+Valid, 2027 SdHoareTripleChecker+Invalid, 909 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 879 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:57:12,050 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [681 Valid, 2027 Invalid, 909 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 879 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2023-11-12 00:57:12,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3493 states. [2023-11-12 00:57:12,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3493 to 3444. [2023-11-12 00:57:12,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3444 states, 2471 states have (on average 1.462161068393363) internal successors, (3613), 2566 states have internal predecessors, (3613), 722 states have call successors, (722), 252 states have call predecessors, (722), 250 states have return successors, (1171), 710 states have call predecessors, (1171), 707 states have call successors, (1171) [2023-11-12 00:57:12,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3444 states to 3444 states and 5506 transitions. [2023-11-12 00:57:12,306 INFO L78 Accepts]: Start accepts. Automaton has 3444 states and 5506 transitions. Word has length 109 [2023-11-12 00:57:12,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:57:12,307 INFO L495 AbstractCegarLoop]: Abstraction has 3444 states and 5506 transitions. [2023-11-12 00:57:12,307 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 13.0) internal successors, (65), 5 states have internal predecessors, (65), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2023-11-12 00:57:12,308 INFO L276 IsEmpty]: Start isEmpty. Operand 3444 states and 5506 transitions. [2023-11-12 00:57:12,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2023-11-12 00:57:12,312 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:57:12,312 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-11-12 00:57:12,329 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-11-12 00:57:12,520 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-12 00:57:12,520 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:57:12,520 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:57:12,520 INFO L85 PathProgramCache]: Analyzing trace with hash -1207147004, now seen corresponding path program 1 times [2023-11-12 00:57:12,521 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:57:12,521 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [855083766] [2023-11-12 00:57:12,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:57:12,521 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:57:12,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:57:12,791 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-12 00:57:12,792 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:57:12,792 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [855083766] [2023-11-12 00:57:12,792 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [855083766] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:57:12,792 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1170349252] [2023-11-12 00:57:12,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:57:12,792 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:57:12,793 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:57:12,794 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:57:12,821 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-11-12 00:57:13,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:57:13,173 INFO L262 TraceCheckSpWp]: Trace formula consists of 1365 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-12 00:57:13,178 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:57:13,241 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-12 00:57:13,242 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 00:57:13,242 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1170349252] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:57:13,242 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 00:57:13,242 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [4] total 7 [2023-11-12 00:57:13,243 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [859113668] [2023-11-12 00:57:13,243 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:57:13,243 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-12 00:57:13,243 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:57:13,244 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-12 00:57:13,244 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-12 00:57:13,245 INFO L87 Difference]: Start difference. First operand 3444 states and 5506 transitions. Second operand has 5 states, 5 states have (on average 13.2) internal successors, (66), 5 states have internal predecessors, (66), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2023-11-12 00:57:14,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:57:14,526 INFO L93 Difference]: Finished difference Result 7369 states and 12029 transitions. [2023-11-12 00:57:14,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-12 00:57:14,527 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 13.2) internal successors, (66), 5 states have internal predecessors, (66), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) Word has length 110 [2023-11-12 00:57:14,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:57:14,575 INFO L225 Difference]: With dead ends: 7369 [2023-11-12 00:57:14,576 INFO L226 Difference]: Without dead ends: 4370 [2023-11-12 00:57:14,599 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2023-11-12 00:57:14,600 INFO L413 NwaCegarLoop]: 734 mSDtfsCounter, 700 mSDsluCounter, 1302 mSDsCounter, 0 mSdLazyCounter, 870 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 702 SdHoareTripleChecker+Valid, 2036 SdHoareTripleChecker+Invalid, 896 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 870 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-11-12 00:57:14,600 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [702 Valid, 2036 Invalid, 896 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 870 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-11-12 00:57:14,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4370 states. [2023-11-12 00:57:14,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4370 to 4237. [2023-11-12 00:57:14,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4237 states, 3011 states have (on average 1.4613085353703088) internal successors, (4400), 3130 states have internal predecessors, (4400), 913 states have call successors, (913), 317 states have call predecessors, (913), 312 states have return successors, (1586), 898 states have call predecessors, (1586), 895 states have call successors, (1586) [2023-11-12 00:57:15,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4237 states to 4237 states and 6899 transitions. [2023-11-12 00:57:15,052 INFO L78 Accepts]: Start accepts. Automaton has 4237 states and 6899 transitions. Word has length 110 [2023-11-12 00:57:15,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:57:15,053 INFO L495 AbstractCegarLoop]: Abstraction has 4237 states and 6899 transitions. [2023-11-12 00:57:15,054 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 13.2) internal successors, (66), 5 states have internal predecessors, (66), 3 states have call successors, (19), 3 states have call predecessors, (19), 3 states have return successors, (17), 3 states have call predecessors, (17), 3 states have call successors, (17) [2023-11-12 00:57:15,054 INFO L276 IsEmpty]: Start isEmpty. Operand 4237 states and 6899 transitions. [2023-11-12 00:57:15,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2023-11-12 00:57:15,059 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:57:15,059 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-11-12 00:57:15,073 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-11-12 00:57:15,267 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-11-12 00:57:15,268 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION === [__automaton_failErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:57:15,268 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:57:15,268 INFO L85 PathProgramCache]: Analyzing trace with hash -1496276200, now seen corresponding path program 1 times [2023-11-12 00:57:15,268 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:57:15,268 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [57248539] [2023-11-12 00:57:15,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:57:15,269 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:57:15,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:57:15,489 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2023-11-12 00:57:15,489 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:57:15,490 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [57248539] [2023-11-12 00:57:15,490 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [57248539] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:57:15,490 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [491525457] [2023-11-12 00:57:15,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:57:15,490 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:57:15,490 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:57:15,492 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:57:15,516 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_cb779338-0133-4096-837f-093ad602fa57/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-11-12 00:57:15,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:57:15,851 INFO L262 TraceCheckSpWp]: Trace formula consists of 1363 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-12 00:57:15,854 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:57:16,002 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 7 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-12 00:57:16,002 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:57:16,287 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-12 00:57:16,287 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [491525457] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:57:16,287 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1022906285] [2023-11-12 00:57:16,312 INFO L159 IcfgInterpreter]: Started Sifa with 91 locations of interest [2023-11-12 00:57:16,312 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:57:16,316 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:57:16,322 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:57:16,323 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs